As filed with the Securities and Exchange Commission on
    July 25, 2007
    Registration
    No. 333-          
 
    UNITED STATES SECURITIES AND
    EXCHANGE COMMISSION
    Washington, D.C.
    20549
 
 
 
    Form S-4
    REGISTRATION STATEMENT UNDER
    THE SECURITIES ACT OF 1933
    SIRIUS SATELLITE RADIO
    INC.
    (Exact name of registrant as
    specified in its charter)
 
    |  |  |  |  |  | 
| Delaware |  | 4832 |  | 52-1700207 | 
| (State or other jurisdiction
    of incorporation or organization)
 |  | (Primary Standard Industrial Classification Code Number)
 |  | (I.R.S. Employer Identification Number)
 | 
 
    1221 Avenue of the Americas, 36th Floor
    New York, New York 10020
    (212) 584-5100
    (Address, including zip code,
    and telephone number, including area code, of registrants
    principal executive offices)
 
 
 
    Patrick L. Donnelly
    Executive Vice President, General Counsel & Secretary
    Sirius Satellite Radio Inc.
    1221 Avenue of the Americas, 36th Floor
    New York, New York 10020
    (212) 584-5100
    (Name, address, including zip
    code, and telephone number, including area code, of agent for
    service)
 
    Copies to:
 
    |  |  |  |  |  | 
| Gary L. Sellers, Esq. Simpson Thacher & Bartlett LLP
 425 Lexington Avenue
 New York, New York 10017
 (212) 455-2000
 |  | Joseph M. Titlebaum General Counsel and Secretary
 XM Satellite Radio Holdings Inc.
 1500 Eckington Place, NE
 Washington, DC 20002
 (202) 380-4000
 |  | Thomas H. Kennedy, Esq. Skadden, Arps, Slate, Meagher & Flom LLP
 Four Times Square
 New York, New York 10036
 (212) 735-3000
 | 
 
 
 
 
    Approximate date of commencement of proposed sale of the
    securities to the public:  As soon as practicable
    after this registration statement becomes effective and all
    other conditions to the proposed merger described herein have
    been satisfied or waived.
 
    If the securities being registered on this Form are being
    offered in connection with the formation of a holding company
    and there is compliance with General Instruction G, check
    the following box.  o
    
 
    If this Form is filed to register additional securities for an
    offering pursuant to Rule 462(b) under the Securities Act,
    check the following box and list the Securities Act registration
    statement number of the earlier effective registration statement
    for the same offering.  o
    
 
    If this Form is a post-effective amendment filed pursuant to
    Rule 462(d) under the Securities Act, check the following
    box and list the Securities Act registration statement number of
    the earlier effective registration statement for the same
    offering.  o
    
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  | Amount 
 |  |  | Proposed Maximum 
 |  |  | Proposed Maximum 
 |  |  | Amount of 
 | 
| Title of Each Class of 
 |  |  | to be 
 |  |  | Offering Price 
 |  |  | Aggregate Offering 
 |  |  | Registration 
 | 
| Securities to be Registered |  |  | Registered |  |  | Per Share |  |  | Price |  |  | Fee | 
| 
    Common Stock, par value $0.001 per
    share
    
 |  |  | 1,701,908,350(1) |  |  | N/A |  |  | $4,510,057,126(2) |  |  | $138,458.75 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  | 
    |  |  |  | 
    | (1) |  | The number of shares of common
    stock of the registrant being registered is based upon
    (x) an estimate of the maximum number of shares of
    Class A common stock, par value $0.01 per share, of XM
    Satellite Radio Holdings Inc. (XM) presently
    outstanding or issuable or expected to be issued in connection
    with the merger of XM with a wholly-owned subsidiary of the
    registrant multiplied by (y) the exchange ratio of
    4.6 shares of common stock, par value $0.001 per share, of
    the registrant, for each such share of Class A common stock
    of XM. | 
|  | 
    | (2) |  | Estimated solely for the purpose of
    calculating the registration fee pursuant to Rule 457(f)
    under the Securities Act of 1933, as amended. The proposed
    maximum aggregate offering price for the common stock is the
    product of (x) $12.19, the average of the high and low
    sales prices of XM Class A common stock, as quoted on the
    NASDAQ Global Select Market, on July 24, 2007, and
    (y) 369,980,076, the estimated maximum number of shares of
    XM Class A common stock that may be exchanged for the
    shares of common stock of the registrant being registered. | 
 
    The Registrant hereby amends this Registration Statement on
    such date or dates as may be necessary to delay its effective
    date until the Registrant shall file a further Amendment which
    specifically states that this Registration Statement shall
    thereafter become effective in accordance with Section 8(a)
    of the Securities Act of 1933 or until the Registration
    Statement shall become effective on such date as the Commission,
    acting pursuant to said Section 8(a), may determine.
 
 
| The
information in this joint proxy statement/prospectus is not
complete and may be changed. We may not sell the securities
offered by this joint proxy statement/prospectus until the
registration statement filed with the Securities and Exchange
Commission is effective. This joint proxy statement/prospectus
does not constitute an offer to sell or a solicitation of an
offer to buy any securities in any jurisdiction where an offer,
solicitation or sale is not permitted. 
 | 
 
 
    PRELIMINARY  SUBJECT
    TO COMPLETION  DATED JULY 25, 2007
 
 
    PROPOSED
    MERGER  YOUR VOTE IS VERY IMPORTANT
 
    Each of the boards of directors of Sirius Satellite Radio Inc.
    and XM Satellite Radio Holdings Inc. has approved a strategic
    merger, combining SIRIUS and XM in what we intend to be a
    merger of equals. We believe that the proposed
    merger will allow XM and SIRIUS to provide more choices for
    their respective subscribers and that the combined company will
    be better positioned to compete in the rapidly evolving audio
    entertainment marketplace.
 
    XM and SIRIUS have entered into an agreement and plan of merger
    pursuant to which XM and SIRIUS will combine their businesses
    through the merger of XM with a newly formed, wholly-owned
    subsidiary of SIRIUS, with XM thereupon becoming a wholly-owned
    subsidiary of SIRIUS.
 
    In the proposed merger, XM stockholders will receive
    4.6 shares of SIRIUS common stock for each share of XM
    Class A common stock, referred to as XM common stock. This
    exchange ratio is fixed and will not be adjusted to reflect
    stock price changes prior to the closing. SIRIUS
    stockholders will continue to own their existing shares, which
    will not be affected by the merger. Upon completion of the
    merger, XMs former stockholders will own
    approximately     % of the then
    outstanding SIRIUS common stock, based on the number of shares
    of SIRIUS and XM outstanding
    on          ,
    2007. The value of the merger consideration to be received in
    exchange for each share of XM common stock will fluctuate with
    the market price of SIRIUS common stock.
 
    Based on the closing sale price for SIRIUS common stock on
    February 16, 2007, the last trading day before public
    announcement of the merger, the 4.6 exchange ratio represented
    approximately $17.02 in value for each share of XM common stock.
    Based on the closing sale price for SIRIUS common stock
    on          ,
    2007, the last trading day before the printing of this joint
    proxy statement/prospectus, which we refer to as this Proxy
    Statement, the 4.6 exchange ratio represented approximately
    $      in value for each share of XM
    common stock.
 
    SIRIUS common stock is listed on the NASDAQ Global Select Market
    under the symbol SIRI. XM common stock is listed on
    the NASDAQ Global Select Market under the symbol
    XMSR. We urge you to obtain current market
    quotations for the shares of SIRIUS and XM.
 
    Your vote is very important. The merger cannot be
    completed unless SIRIUS stockholders approve the amendment to
    SIRIUS certificate of incorporation and the issuance of
    SIRIUS capital stock in the merger and XM stockholders adopt the
    merger agreement. Each of XM and SIRIUS is holding a special
    meeting of its stockholders to vote on the proposals necessary
    to complete the merger. Information about these meetings, the
    merger and the other business to be considered by stockholders
    is contained in this Proxy Statement. We urge you to read this
    Proxy Statement carefully. You should also carefully consider
    the risk factors beginning on page 15.
 
    Whether or not you plan to attend your respective
    companys special meeting of stockholders, please submit
    your proxy as soon as possible to make sure that your shares are
    represented at that meeting.
 
    The SIRIUS board of directors recommends that SIRIUS
    stockholders vote FOR the proposals to approve the amendment to
    SIRIUS certificate of incorporation and the issuance of
    SIRIUS capital stock in the merger, both of which are necessary
    to effect the merger.
 
    The XM board of directors recommends that XM stockholders
    vote FOR the proposal to adopt the merger agreement.
 
    |  |  |  | 
|  |  |   | 
| 
    Mel Karmazin
    
 |  | Gary M. Parsons | 
| 
    Chief Executive Officer
    
 |  | Chairman of the Board of Directors | 
| 
    Sirius Satellite Radio Inc.
    
 |  | XM Satellite Radio Holdings Inc. | 
 
    Neither the Securities and Exchange Commission nor any state
    securities commission has approved or disapproved of the
    securities to be issued in connection with the merger or
    determined if this Proxy Statement is accurate or complete. Any
    representation to the contrary is a criminal offense.
 
    This Proxy Statement is
    dated          ,
    2007, and is first being mailed to stockholders of XM and SIRIUS
    on or
    about          ,
    2007.
 
    ADDITIONAL
    INFORMATION
 
    This Proxy Statement incorporates by reference important
    business and financial information about SIRIUS and XM from
    other documents that are not included in or delivered with this
    Proxy Statement. For a listing of the documents incorporated by
    reference into this Proxy Statement, see Where You Can
    Find More Information. This information is available to
    you without charge upon your written or oral request. You can
    obtain the documents incorporated by reference into this
    document through the Securities and Exchange Commission website
    at
    http://www.sec.gov
    or by requesting them in writing or by telephone at the
    appropriate address below:
 
    |  |  | 
    | By
    Mail: | Sirius
    Satellite Radio Inc. 1221 Avenue of the Americas
 36th Floor
 New York, New York 10020
 Attention: Investor Relations
 | 
 
    By
    Telephone:
    (212) 584-5180
    
 
    |  |  | 
    | By
    Mail: | XM Satellite
    Radio Holdings Inc. 1500 Eckington Place, NE
 Washington, DC 20002
 Attention: Investor Relations
 | 
 
    
    By
    Telephone:
    (202) 380-4000
    
 
    You may also obtain documents incorporated by reference into
    this Proxy Statement by requesting them in writing or by
    telephone
    from          ,
    SIRIUS proxy solicitor,
    or          ,
    XMs proxy solicitor, at the following addresses and
    telephone numbers:
 
 
    To receive timely delivery of the documents in advance of the
    meetings, you should make your request no later
    than          ,
    2007.
 
    VOTING
    ELECTRONICALLY OR
    BY TELEPHONE
 
    SIRIUS stockholders of record on the close of business
    on          ,
    2007, the record date for the SIRIUS special meeting, may submit
    their proxies by telephone or Internet by following the
    instructions on their proxy card or voting form. If you have any
    questions regarding whether you are eligible to submit your
    proxy by telephone or by Internet, please
    contact          
    by telephone
    at          
    (toll free) or via the Internet
    at          .
 
    XM stockholders of record on the close of business
    on          ,
    2007, the record date for the XM special meeting, may submit
    their proxies by telephone or Internet by following the
    instructions on their proxy card or voting form. If you have any
    questions regarding whether you are eligible to submit your
    proxy by telephone or by Internet, please
    contact          
    by telephone at (toll free) or via the Internet
    at          .
 
 
 
 
    NOTICE
    OF SPECIAL MEETING OF STOCKHOLDERS
    TO BE HELD
    ON                    ,
    2007
 
 
    To the
    Stockholders of Sirius Satellite Radio Inc.:
    
 
    A special meeting of stockholders of Sirius Satellite Radio Inc.
    will be held
    at          ,
    on          ,
    2007 at   a.m., local time, for the following
    purposes:
 
    1. To amend SIRIUS certificate of incorporation to
    increase the number of authorized shares of SIRIUS common stock
    (the Charter Amendment).
 
    2. To approve the issuance of SIRIUS common stock, par
    value $0.001 per share, and SIRIUS Series A convertible
    preferred stock, par value $0.001 per share, a new series of
    SIRIUS preferred stock, pursuant to the Merger Agreement, dated
    as of February 19, 2007, by and among Sirius Satellite
    Radio Inc., Vernon Merger Corporation and XM Satellite Radio
    Holdings Inc., as the same may be amended from time to time (the
    Share Issuance).
 
    3. To approve any motion to adjourn or postpone the special
    meeting to a later date or dates, if necessary, to solicit
    additional proxies if there are insufficient votes at the time
    of the special meeting.
 
    4. To transact such other business as may properly come
    before the special meeting or any adjournment or postponement
    thereof.
 
    Proposals 1 and 2 are conditioned on each other and
    approval of each is required for completion of the merger.
 
    The accompanying Proxy Statement further describes the matters
    to be considered at the meeting. A copy of the merger agreement
    has been included as Annex A to the Proxy Statement.
 
    The SIRIUS board of directors has
    set          ,
    2007 as the record date for the special meeting. Only holders of
    record of SIRIUS common stock at the close of business
    on          ,
    2007 will be entitled to notice of and to vote at the special
    meeting and any adjournments or postponements thereof. Any
    stockholder entitled to attend and vote at the meeting is
    entitled to appoint a proxy to attend and vote on such
    stockholders behalf. Such proxy need not be a holder of
    SIRIUS common stock. To ensure your representation at the
    special meeting, please complete and return the enclosed proxy
    card or submit your proxy by telephone or through the Internet.
    Please vote promptly whether or not you expect to attend the
    special meeting. Submitting a proxy now will not prevent you
    from being able to vote at the special meeting by attending in
    person and casting a vote.
 
    The SIRIUS board of directors recommends that you vote FOR
    the proposal to amend SIRIUS certificate of incorporation
    to increase the number of authorized shares of common stock, FOR
    the proposal to approve the issuance of SIRIUS common stock and
    SIRIUS Series A convertible preferred stock in the merger
    and FOR the proposal to approve any motion to adjourn or
    postpone the special meeting to a later date or dates if
    necessary to solicit additional proxies.
 
    By Order of
    the Board of Directors,
    
 
 
    PATRICK L.
    DONNELLY
    Executive Vice President, General Counsel and Secretary
    New York, New York
    
 
              ,
    2007
    
 
    PLEASE VOTE YOUR SHARES PROMPTLY.  YOU CAN FIND
    INSTRUCTIONS FOR VOTING ON THE ENCLOSED PROXY CARD. IF YOU
    HAVE QUESTIONS ABOUT THE PROPOSALS OR ABOUT VOTING YOUR
    SHARES, PLEASE
    CALL          
    AT          (TOLL
    FREE) OR VIA THE INTERNET
    AT          .
 
 
 
 
    NOTICE
    OF SPECIAL MEETING OF STOCKHOLDERS
    TO BE HELD
    ON          ,
    2007
 
 
    To the
    Stockholders of XM Satellite Radio Holdings Inc.:
    
 
    A special meeting of stockholders of XM Satellite Radio Holdings
    Inc. will be held
    at          ,
    on          ,
    2007
    at          a.m.,
    local time, for the following purposes:
 
    1. To adopt the Merger Agreement, dated as of
    February 19, 2007, by and among Sirius Satellite Radio
    Inc., Vernon Merger Corporation and XM Satellite Radio Holdings
    Inc. as the same may be amended from time to time.
 
    2. To approve any motion to adjourn or postpone the special
    meeting to a later date or dates, if necessary, to solicit
    additional proxies if there are insufficient votes at the time
    of the special meeting to approve the proposal to adopt the
    merger agreement.
 
    3. To transact such other business as may properly come
    before the special meeting or any adjournment or postponement
    thereof.
 
    The accompanying Proxy Statement further describes the matters
    to be considered at the special meeting. A copy of the merger
    agreement has been included as Annex A to this Proxy
    Statement.
 
    The XM board of directors has
    set          ,
    2007 as the record date for the special meeting. Only holders of
    record of shares of XM common stock at the close of business
    on          ,
    2007 will be entitled to notice of and to vote at the special
    meeting and any adjournments or postponements thereof. To
    ensure your representation at the special meeting, please
    complete and return the enclosed proxy card or submit your proxy
    by telephone or through the Internet. Please vote promptly
    whether or not you expect to attend the special meeting.
    Submitting a proxy now will not prevent you from being able to
    vote at the special meeting by attending in person and casting a
    vote.
 
    The board of directors of XM recommends that you vote FOR the
    proposal to adopt the merger agreement and FOR the proposal to
    approve any motion to adjourn or postpone the Special Meeting to
    a later date or dates if necessary to solicit additional
    proxies.
 
    By Order of
    the Board of Directors,
    
 
 
    Gary M.
    Parsons
    Chairman of the Board of Directors
    
 
              ,
    2007
    
 
    PLEASE VOTE YOUR SHARES PROMPTLY.  YOU CAN FIND
    INSTRUCTIONS FOR VOTING ON THE ENCLOSED PROXY CARD. IF YOU
    HAVE QUESTIONS ABOUT THE PROPOSALS OR ABOUT VOTING YOUR
    SHARES, PLEASE
    CONTACT          
    BY TELEPHONE
    AT          (TOLL
    FREE) OR VIA THE INTERNET
    AT          .
 
 
    Table of
    Contents
 
    |  |  |  |  |  | 
|  |  | Page | 
|  | 
|  |  |  | iv |  | 
|  |  |  | 1 |  | 
|  |  |  | 1 |  | 
|  |  |  | 2 |  | 
|  |  |  | 2 |  | 
|  |  |  | 2 |  | 
|  |  |  | 3 |  | 
|  |  |  | 3 |  | 
|  |  |  | 3 |  | 
|  |  |  | 3 |  | 
|  |  |  | 4 |  | 
|  |  |  | 4 |  | 
|  |  |  | 5 |  | 
|  |  |  | 5 |  | 
|  |  |  | 5 |  | 
|  |  |  | 5 |  | 
|  |  |  | 6 |  | 
|  |  |  | 6 |  | 
|  |  |  | 7 |  | 
|  |  |  | 7 |  | 
|  |  |  | 7 |  | 
|  |  |  | 7 |  | 
|  |  |  | 8 |  | 
|  |  |  | 8 |  | 
|  |  |  | 9 |  | 
|  |  |  | 10 |  | 
|  |  |  | 11 |  | 
|  |  |  | 12 |  | 
|  |  |  | 13 |  | 
|  |  |  | 13 |  | 
|  |  |  | 13 |  | 
|  |  |  | 14 |  | 
|  |  |  | 15 |  | 
|  |  |  | 19 |  | 
|  |  |  | 19 |  | 
|  |  |  | 21 |  | 
|  |  |  | 23 |  | 
|  |  |  | 24 |  | 
|  |  |  | 25 |  | 
|  |  |  | 34 |  | 
|  |  |  | 41 |  | 
|  |  |  | 45 |  | 
|  |  |  | 45 |  | 
    
    i
 
    |  |  |  |  |  | 
|  |  | Page | 
|  | 
|  |  |  | 46 |  | 
|  |  |  | 46 |  | 
|  |  |  | 46 |  | 
|  |  |  | 47 |  | 
|  |  |  | 48 |  | 
|  |  |  | 50 |  | 
|  |  |  | 50 |  | 
|  |  |  | 50 |  | 
|  |  |  | 50 |  | 
|  |  |  | 50 |  | 
|  |  |  | 52 |  | 
|  |  |  | 52 |  | 
|  |  |  | 54 |  | 
|  |  |  | 54 |  | 
|  |  |  | 56 |  | 
|  |  |  | 57 |  | 
|  |  |  | 58 |  | 
|  |  |  | 58 |  | 
|  |  |  | 58 |  | 
|  |  |  | 59 |  | 
|  |  |  | 59 |  | 
|  |  |  | 60 |  | 
|  |  |  | 60 |  | 
|  |  |  | 60 |  | 
|  |  |  | 60 |  | 
|  |  |  | 61 |  | 
|  |  |  | 61 |  | 
|  |  |  | 61 |  | 
|  |  |  | 61 |  | 
|  |  |  | 61 |  | 
|  |  |  | 62 |  | 
|  |  |  | 62 |  | 
|  |  |  | 62 |  | 
|  |  |  | 62 |  | 
|  |  |  | 62 |  | 
|  |  |  | 63 |  | 
|  |  |  | 63 |  | 
|  |  |  | 63 |  | 
|  |  |  | 64 |  | 
|  |  |  | 64 |  | 
|  |  |  | 64 |  | 
|  |  |  | 67 |  | 
|  |  |  | 67 |  | 
|  |  |  | 67 |  | 
    
    ii
 
 
    |  |  | 
    | Annex A  | Merger Agreement | 
 
    |  |  | 
    | Annex B  | Fairness Opinion of Morgan Stanley & Co. Incorporated | 
|  | 
    | Annex C  | Fairness Opinion of J.P. Morgan Securities Inc. | 
 
    |  |  | 
    | Annex D  | Form of Certificate of Amendment of Amended and Restated
    Certificate of Incorporation of Sirius Satellite Radio Inc. | 
    
    iii
 
 
    QUESTIONS
    AND ANSWERS ABOUT THE MEETINGS
 
    The following questions and answers briefly address some
    commonly asked questions about the SIRIUS and the XM special
    meetings. They may not include all the information that is
    important to stockholders of XM and SIRIUS. We urge stockholders
    to read carefully this entire Proxy Statement, including the
    annexes and the other documents referred to herein.
 
    |  |  |  | 
    | Q: |  | Why am I receiving these materials? | 
|  | 
    | A: |  | We are sending you these materials to help you decide how to
    vote your shares of XM or SIRIUS stock with respect to their
    proposed merger. | 
|  | 
    |  |  | The merger cannot be completed unless XM stockholders adopt the
    merger agreement, and SIRIUS stockholders approve the amendment
    of SIRIUS certificate of incorporation and the issuance of
    SIRIUS capital stock in the merger. Each of SIRIUS and XM is
    holding its special meeting of stockholders to vote on the
    proposals necessary to complete the merger. Information about
    these meetings, the merger and the other business to be
    considered by stockholders is contained in this Proxy Statement. | 
|  | 
    |  |  | We are delivering this document to you as both a joint proxy
    statement of XM and SIRIUS and a prospectus of SIRIUS. It is a
    joint proxy statement because each of our boards of directors is
    soliciting proxies from its stockholders. It is a prospectus
    because SIRIUS will exchange shares of its common stock for
    shares of XM in the merger. | 
|  | 
    | Q: |  | What will stockholders receive in the merger? | 
|  | 
    | A: |  | In the proposed merger, XM stockholders will receive
    4.6 shares of SIRIUS common stock for each share of XM
    common stock. This exchange ratio is fixed and will not be
    adjusted to reflect stock price changes prior to the closing.
    SIRIUS stockholders will continue to own their existing
    shares, which will not be affected by the merger. | 
|  | 
    | Q: |  | When do XM and SIRIUS expect to complete the merger? | 
|  | 
    | A: |  | XM and SIRIUS expect to complete the merger after all conditions
    to the merger in the merger agreement are satisfied or waived,
    including after stockholder approvals are received at the
    special meetings of XM and SIRIUS and all required regulatory
    approvals are received. SIRIUS and XM currently expect to
    complete the merger by the end of 2007. However, it is possible
    that factors outside of either companys control could
    require SIRIUS or XM to complete the merger at a later time or
    not to complete it at all. | 
|  | 
    | Q: |  | How do the boards of directors of SIRIUS and XM recommend
    that I vote? | 
|  | 
    | A: |  | The SIRIUS board of directors recommends that holders of SIRIUS
    common stock vote FOR the proposal to amend SIRIUS
    certificate of incorporation and FOR the proposal to approve the
    issuance of SIRIUS common stock and preferred stock in the
    merger. | 
|  | 
    |  |  | The XM board of directors recommends that XM stockholders vote
    FOR the proposal to adopt the merger agreement. | 
|  | 
    | Q: |  | What do I need to do now? | 
|  | 
    | A: |  | After carefully reading and considering the information
    contained in this Proxy Statement, please vote your shares as
    soon as possible so that your shares will be represented at your
    respective companys special meeting. Please follow the
    instructions set forth on the proxy card or on the voting
    instruction form provided by the record holder if your shares
    are held in the name of your broker or other nominee. | 
|  | 
    | Q: |  | How do I vote? | 
|  | 
    | A: |  | You may vote before your companys special meeting in one
    of the following ways: | 
 
    |  |  |  | 
    |  |  | use the toll-free number shown on your proxy card; | 
    
    iv
 
 
    |  |  |  | 
    |  |  | visit the website shown on your proxy card to vote via the
    Internet; or | 
|  | 
    |  |  | complete, sign, date and return the enclosed proxy card in the
    enclosed postage-paid envelope. | 
 
    |  |  |  | 
    |  |  | You may also cast your vote in person at your companys
    special meeting. | 
|  | 
    |  |  | If your shares are held in street name, through a
    broker, bank or other nominee, that institution will send you
    separate instructions describing the procedure for voting your
    shares. Street name stockholders who wish to vote at
    the meeting will need to obtain a proxy form from the
    institution that holds their shares. | 
|  | 
    | Q: |  | When and where are the SIRIUS and XM special meetings of
    stockholders? | 
|  | 
    | A: |  | The special meeting of SIRIUS stockholders will be held
    at          
    at          a.m.,
    local time,
    on          ,
    2007. Subject to space availability, all stockholders as of the
    record date, or their duly appointed proxies, may attend the
    meeting. Since seating is limited, admission to the meeting will
    be on a first-come, first-served basis. Registration and seating
    will begin at   a.m., local time. | 
|  | 
    |  |  | The special meeting of XM stockholders will be held at
    the          at   a.m.,
    local time,
    on          ,
    2007. Subject to space availability, all stockholders as of the
    record date, or their duly appointed proxies, may attend the
    meeting. Since seating is limited, admission to the meeting will
    be on a first-come, first-served basis. Registration and seating
    will begin at   a.m., local time. | 
|  | 
    | Q: |  | If my shares are held in street name by a broker
    or other nominee, will my broker or nominee vote my shares for
    me? | 
|  | 
    | A: |  | Your broker or other nominee does not have authority to vote on
    the proposals described in this Proxy Statement. Your broker or
    other nominee will vote your shares held by it in street
    name with respect to these matters ONLY if you provide
    instructions to it on how to vote. You should follow the
    directions your broker or other nominee provides. | 
|  | 
    | Q: |  | What constitutes a quorum? | 
|  | 
    |  |  | Stockholders who hold a majority in voting power of the SIRIUS
    common stock issued and outstanding as of the close of business
    on the record date and who are entitled to vote must be present
    or represented by proxy in order to constitute a quorum to
    conduct business at the SIRIUS special meeting. | 
|  | 
    |  |  | Stockholders who hold a majority in voting power of the XM
    common stock issued and outstanding as of the close of business
    on the record date and who are entitled to vote must be present
    or represented by proxy in order to constitute a quorum to
    conduct business at the XM special meeting. | 
|  | 
    | Q: |  | What vote is required to approve each proposal? | 
|  | 
    | A: |  | To amend the certificate of incorporation of SIRIUS: the
    affirmative vote of a majority of the outstanding shares of
    common stock of SIRIUS entitled to vote is required to approve
    the amendment to the certificate of incorporation to increase
    the authorized number of shares of common stock, which is
    referred to in this Proxy Statement as the Charter Amendment. | 
|  | 
    |  |  | To issue SIRIUS common stock and Series A convertible
    preferred stock in the merger: the affirmative vote of a
    majority of the SIRIUS shares voting on the proposal is required
    to approve the issuance of SIRIUS common stock and Series A
    convertible preferred stock in the merger, which is referred to
    in this Proxy Statement as the Share Issuance. | 
|  | 
    |  |  | To approve the merger agreement: the affirmative vote of
    a majority of the outstanding shares of XM common stock entitled
    to vote is required to approve the merger agreement, which is
    referred to in this Proxy Statement as the Merger Proposal. | 
|  | 
    | Q: |  | What if I do not vote on the matters relating to the
    merger? | 
|  | 
    | A: |  | If you are a SIRIUS stockholder and you fail to vote or fail to
    instruct your broker or other nominee how to vote on the Charter
    Amendment, your failure to vote will have the same effect as a
    vote against the Charter Amendment. If you respond with an
    abstain vote, your proxy will have the same effect
    as a vote against this | 
    
    v
 
    |  |  |  | 
    |  |  | proposal. If you respond but do not indicate how you want to
    vote on the Charter Amendment, your proxy will be counted as a
    vote in favor of the Charter Amendment. | 
|  | 
    |  |  | If you are a SIRIUS stockholder and you fail to vote or fail to
    instruct your broker or other nominee how to vote on the Share
    Issuance, it will have no effect on the outcome of the vote for
    this proposal. Similarly, if you respond with an
    abstain vote, your proxy will have no effect on the
    outcome of the vote for this proposal. If you respond but do not
    indicate how you want to vote on the Share Issuance, your proxy
    will be counted as a vote in favor of the Share Issuance. | 
|  | 
    |  |  | The approval of the Charter Amendment and the Share Issuance are
    conditioned on each other, and approval of each is required for
    completion of the merger. | 
|  | 
    |  |  | If you are an XM stockholder and you fail to vote or fail to
    instruct your broker or other nominee how to vote on the Merger
    Proposal, it will have the same effect as a vote against the
    Merger Proposal. If you respond with an abstain vote
    on the Merger Proposal, your proxy will have the same effect as
    a vote against the Merger Proposal. If you respond but do not
    indicate how you want to vote on the Merger Proposal, your proxy
    will be counted as a vote in favor of the Merger Proposal. | 
|  | 
    | Q: |  | What if I hold shares in both XM and SIRIUS? | 
|  | 
    | A. |  | If you are a stockholder of both XM and SIRIUS, you will receive
    two separate packages of proxy materials. A vote as an XM
    stockholder for the Merger Proposal will not constitute a vote
    as a SIRIUS stockholder for the Charter Amendment or the Share
    Issuance, or vice versa. Therefore, please sign, date and return
    all proxy cards that you receive, whether from XM or SIRIUS, or
    vote as both a XM and SIRIUS stockholder by internet or
    telephone. | 
|  | 
    | Q: |  | May I change my vote after I have delivered my proxy or
    voting instruction card? | 
|  | 
    | A: |  | Yes. You may change your vote at any time before your proxy is
    voted at your special meeting. You may do this in one of four
    ways: | 
 
    |  |  |  | 
    |  |  | by sending a notice of revocation to the corporate secretary of
    SIRIUS or XM, as applicable; | 
|  | 
    |  |  | by sending a completed proxy card bearing a later date than your
    original proxy card; | 
|  | 
    |  |  | by logging onto the Internet website specified on your proxy
    card in the same manner you would to submit your proxy
    electronically or by calling the telephone number specified on
    your proxy card, in each case if you are eligible to do so and
    following the instructions on the proxy card; or | 
|  | 
    |  |  | by attending your special meeting and voting in person. Your
    attendance alone will not revoke any proxy. | 
 
    |  |  |  | 
    |  |  | If you choose any of the first three methods, you must take the
    described action no later than the beginning of the applicable
    special meeting. | 
|  | 
    |  |  | If your shares are held in an account at a broker or other
    nominee, you should contact your broker or other nominee to
    change your vote. | 
|  | 
    | Q: |  | What are the material U.S. federal income tax consequences of
    the merger? | 
|  | 
    | A: |  | SIRIUS and XM intend for the merger to qualify as a
    reorganization within the meaning of Section 368(a) of the
    Internal Revenue Code of 1986, which we refer to as the Code,
    for U.S. federal income tax purposes. Assuming the merger
    qualifies for such treatment, a holder of XM common stock
    generally will not recognize any gain or loss for U.S. federal
    income tax purposes upon the exchange of the holders
    shares of XM common stock for shares of SIRIUS common stock
    pursuant to the merger. | 
|  | 
    | Q: |  | Do I have appraisal rights? | 
|  | 
    | A: |  | Holders of XM common stock or SIRIUS common stock will not be
    entitled to exercise any appraisal rights in connection with the
    merger. | 
    
    vi
 
 
    |  |  |  | 
    | Q: |  | Should I send in my stock certificates now? | 
|  | 
    | A: |  | No. Please do not send your stock certificates with your
    proxy card. | 
|  | 
    |  |  | If you are a holder of XM common stock, you will receive written
    instructions from the exchange agent after the merger is
    completed on how to exchange your stock certificates for SIRIUS
    common stock. SIRIUS stockholders will not be required to
    exchange their stock certificates in connection with the merger.
    SIRIUS stockholders holding stock certificates should keep their
    stock certificates both now and after the merger is completed. | 
|  | 
    | Q: |  | What if I hold XM and SIRIUS stock options or other
    stock-based awards? | 
|  | 
    | A: |  | SIRIUS stock options and other equity-based awards, including
    restricted stock units, will remain outstanding and will not be
    affected by the merger. | 
|  | 
    |  |  | In the merger, all outstanding XM employee stock options and
    other stock-based awards will be converted into options and
    stock-based awards of SIRIUS, and those options and awards will
    entitle the holder to receive SIRIUS common stock. The number of
    shares issuable under those options and awards, and, if
    applicable, the exercise prices for those options and awards,
    will be adjusted based on the exchange ratio. | 
|  | 
    | Q: |  | Who should I contact if I have any questions about the proxy
    materials or voting power? | 
|  | 
    | A: |  | If you have any questions about the merger or if you need
    assistance in submitting your proxy or voting your shares or
    need additional copies of the Proxy Statement or the enclosed
    proxy card, you should contact the proxy solicitation agent for
    the company in which you hold shares. | 
|  | 
    |  |  | If you are a SIRIUS stockholder, you should
    contact          ,
    the proxy solicitation agent for SIRIUS. If you are an XM
    stockholder, you should
    contact          ,
    the proxy solicitation agent for XM. If your shares are held in
    a stock brokerage account or by a bank or other nominee, you
    should call your broker or other nominee for additional
    information. | 
    
    vii
 
 
    SUMMARY
 
    This summary highlights selected information contained in
    this joint proxy statement/prospectus, referred to as this Proxy
    Statement, and does not contain all the information that may be
    important to you. SIRIUS and XM urge you to read carefully this
    Proxy Statement in its entirety, as well as the annexes.
    Additional, important information is also contained in the
    documents incorporated by reference into this Proxy Statement;
    see Where You Can Find More Information beginning on
    page 91. Unless stated otherwise, all references in this
    Proxy Statement to SIRIUS are to Sirius Satellite Radio Inc.,
    all references to XM are to XM Satellite Radio Holdings Inc. and
    all references to the merger agreement are to the Merger
    Agreement, dated as of February 19, 2007, by and among
    SIRIUS, Vernon Merger Corporation and XM, a copy of which is
    attached as Annex A to this Proxy Statement.
 
    The
    Merger
 
    Each of the boards of directors of XM and SIRIUS has approved a
    strategic merger, combining XM and SIRIUS in what the parties
    intend to be a merger of equals. SIRIUS and XM have
    entered into an agreement and plan of merger pursuant to which
    SIRIUS and XM will combine their businesses through the merger
    of XM with a newly formed, wholly-owned subsidiary of SIRIUS,
    with XM thereupon becoming a wholly-owned subsidiary of SIRIUS.
    In the proposed merger, XM stockholders will receive
    4.6 shares of SIRIUS common stock for each share of XM
    common stock. This exchange ratio is fixed and will not be
    adjusted to reflect stock price changes prior to the closing.
    SIRIUS stockholders will continue to own their existing
    shares, which will not be affected by the merger.
 
    The
    Parties
 
    SIRIUS
 
    SIRIUS is a satellite radio provider in the United States. It
    offers over 130 channels to its subscribers  69
    channels of 100% commercial-free music and 65 channels of
    sports, news, talk, entertainment, traffic, weather and data
    content. The core of the SIRIUS enterprise is programming;
    SIRIUS is committed to creating the best programming in all of
    radio.
 
    SIRIUS broadcasts through its proprietary satellite radio
    system, which currently consists of three orbiting satellites,
    127 terrestrial repeaters that receive and retransmit
    SIRIUS signal, a satellite uplink facility and its
    studios. Subscribers receive their service through SIRIUS
    radios, which are sold by automakers, consumer electronics
    retailers, mobile audio dealers and through SIRIUS
    website. Subscribers can also receive SIRIUS music
    channels and certain other channels over the Internet. As of
    March 31, 2007, SIRIUS had 6,581,045 subscribers.
 
    For the year ended December 31, 2006, SIRIUS had revenues
    of approximately $637 million and a net loss of
    approximately $1.1 billion.
 
    SIRIUS was incorporated in the State of Delaware as Satellite CD
    Radio Inc. on May 17, 1990. SIRIUS principal offices
    are located at 1221 Avenue of the Americas, 36th Floor, New
    York, New York 10020, and its telephone number is
    (212) 584-5100.
 
    XM
 
    XM is a satellite radio provider in the United States. It offers
    over 170 channels to its subscribers  69 channels of
    100% commercial-free music and over 100 channels of news, talk,
    information, entertainment and sports programming. XM believes
    that it appeals to consumers because of its innovative and
    diverse programming, nationwide coverage, many commercial-free
    music channels and digital sound quality.
 
    XM broadcasts through its proprietary satellite radio system,
    which currently consists of two orbiting satellites, two
    in-orbit spare satellites, terrestrial repeaters that receive
    and retransmit XMs signal, satellite uplink facilities and
    its studios. Subscribers receive their service through XM
    radios, which are sold by automakers, consumer electronics
    retailers, mobile audio dealers and through XMs website.
    Subscribers can also receive XM music channels and certain other
    channels over the Internet. XM currently has over 8 million
    subscribers.
 
    
    1
 
    For the year ended December 31, 2006, XM had revenues of
    approximately $933 million and a net loss of approximately
    $719 million.
 
    XM is a holding company and was incorporated in the State of
    Delaware as AMRC Holdings, Inc. on May 16, 1997. XMs
    principal offices are located at 1500 Eckington Place, NE,
    Washington, DC 20002, and XMs telephone number at that
    location is
    (202) 380-4000.
 
    Merger
    Sub
 
    Vernon Merger Corporation, or Merger Sub, a wholly-owned
    subsidiary of SIRIUS, is a Delaware corporation formed on
    February 15, 2007, for the purpose of effecting the merger.
    Upon completion of the merger, Merger Sub will merge with and
    into XM, and XM will become a wholly-owned subsidiary of SIRIUS.
 
    Merger Sub has not conducted any activities other than those
    incidental to its formation and the matters contemplated by the
    merger agreement, including the preparation of applicable
    regulatory filings in connection with the merger.
 
    The
    Merger
 
    A copy of the merger agreement is attached as Annex A to
    this Proxy Statement. We encourage you to read the entire merger
    agreement carefully because it is the principal document
    governing the merger. For more information on the merger
    agreement, see The Merger Agreement beginning on
    page 50.
 
    Consideration
    to be Received in the Merger by XM Stockholders
 
    Each outstanding share of XM common stock will be converted into
    the right to receive 4.6 shares of SIRIUS common stock in
    the merger, which we refer to as the exchange ratio. Each
    outstanding share of Series A convertible preferred stock
    of XM will be similarly converted into the right to receive
    4.6 shares of SIRIUS Series A convertible preferred
    stock, a newly-designated series of preferred stock of SIRIUS,
    in the merger, having substantially the same powers,
    designations, preferences, rights and qualifications,
    limitations and restrictions as the stock so converted.
 
    Holders of XM common stock will not receive any fractional
    SIRIUS shares in the merger. Instead, the total number of shares
    that each holder of XM common stock will receive in the merger
    will be rounded down to the nearest whole number, and SIRIUS
    will pay cash for any resulting fractional share that an XM
    stockholder otherwise would be entitled to receive. The amount
    of cash payable for a fractional share of SIRIUS common stock
    will be determined by multiplying the fraction by the average
    closing price for SIRIUS common stock on the last trading day
    immediately prior to the merger.
 
    The merger agreement provides for adjustments to the exchange
    ratio to reflect fully the effect of any stock split, reverse
    stock split, stock dividend (including any dividend or
    distribution of securities convertible into XM Series A
    convertible preferred stock, common stock or SIRIUS common
    stock), reorganization, recapitalization, reclassification or
    other like change with respect to XM Series A convertible
    preferred stock, SIRIUS common stock or XM common stock with a
    record date prior to the merger. For a more complete description
    of the merger consideration, see The Merger
    Agreement  Consideration to be Received in the
    Merger beginning on page 50.
 
    Treatment
    of Stock Options and Other Stock-based Awards
 
    SIRIUS
 
    SIRIUS stock options and other equity-based awards, including
    restricted stock units, will remain outstanding and will not be
    affected by the merger.
 
    XM
 
    In the merger, all outstanding XM employee stock options and
    other stock-based awards will be converted into options and
    stock-based awards of SIRIUS, and those options and awards will
    entitle the holder to receive SIRIUS
 
    
    2
 
    common stock. The number of shares issuable under those options
    and awards, and the exercise prices for those options and
    awards, will be adjusted based on the exchange ratio.
 
    For a more complete discussion of the treatment of XM options
    and other stock-based awards, see The Merger
    Agreement  Treatment of XM Options and Other
    Stock-based Awards beginning on page 59.
 
    Directors
    and Executive Management Following the Merger
 
    The SIRIUS board of directors after the merger will initially
    consist of 12 directors. Mel Karmazin, SIRIUS Chief
    Executive Officer, or CEO, and a member of the SIRIUS board of
    directors, will remain CEO of the combined company and a member
    of the board of directors. Gary M. Parsons, XMs Chairman,
    will become chairman of the board of directors of the combined
    company. Of the remaining 10 directors, XM and SIRIUS will
    each designate four directors, who will qualify as independent
    directors, and XM will designate two additional directors (one
    will be a designee of General Motors and the other will be a
    designee of American Honda).
 
    For a more complete discussion of the directors and management
    of SIRIUS, see The Merger  Interests of
    Directors and Executive Officers in the Merger beginning
    on page 41.
 
    Recommendations
    of the SIRIUS Board of Directors
 
    After careful consideration, the SIRIUS board of directors
    recommends that holders of SIRIUS common stock vote FOR the
    Charter Amendment and the Share Issuance.
 
    For a more complete description of SIRIUS reasons for the
    merger and the recommendations of the SIRIUS board of directors,
    see The Merger  Reasons for the Merger
    and  SIRIUS Board of Directors
    Recommendations beginning on pages 21 and 23, respectively.
 
    Recommendation
    of the XM Board of Directors
 
    After careful consideration, the XM board of directors
    recommends that holders of XM common stock vote FOR the Merger
    Proposal.
 
    For a more complete description of XMs reasons for the
    merger and the recommendation of the XM board of directors, see
    The Merger  Reasons for the Merger and
     XM Board of Directors Recommendation
    beginning on pages 21 and 24, respectively.
 
    Opinions
    of Financial Advisor
 
    SIRIUS
    Financial Advisor
 
    SIRIUS board of directors considered the analyses of
    Morgan Stanley & Co. Incorporated, and Morgan Stanley
    rendered an opinion that, as of February 18, 2007 and based
    upon and subject to the factors and assumptions set forth in the
    opinion, the exchange ratio pursuant to the merger agreement was
    fair, from a financial point of view, to SIRIUS. The full text
    of the Morgan Stanley opinion, dated February 18, 2007, is
    attached as Annex B to this Proxy Statement. You are urged
    to read the opinion carefully in its entirety for a description
    of the assumptions on the review undertaken.
 
    Morgan Stanley provided its opinion for the use and benefit of
    the SIRIUS board of directors in connection with its
    consideration of the merger. The Morgan Stanley opinion is not
    intended to be and does not constitute a recommendation to any
    stockholder as to how that stockholder should vote or act with
    respect to the proposed merger or any other matter described in
    this Proxy Statement. Morgan Stanley was not requested to opine
    as to, and its opinion does not in any manner address,
    SIRIUS underlying business decision to proceed with or
    effect the merger. The summary of the Morgan Stanley opinion in
    this Proxy Statement is qualified in its entirety by reference
    to the full text of the opinion.
 
    Pursuant to the terms of the engagement letter with Morgan
    Stanley, SIRIUS has agreed to pay Morgan Stanley a transaction
    fee of $10 million for services rendered in connection with
    the merger, which will be paid only if the merger is
    successfully completed. Also, pursuant to the engagement letter,
    Morgan Stanley will be eligible to
 
    
    3
 
    receive an incentive fee of up to $7.5 million, payable at
    the sole discretion of the SIRIUS board of directors. In the
    event that the merger agreement is terminated, Morgan Stanley is
    entitled to receive 15% of any breakup fee paid to SIRIUS as a
    result of such termination, up to a maximum amount of
    $10 million. In addition, SIRIUS has agreed to indemnify
    Morgan Stanley and its affiliates, their respective directors,
    officers, agents and employees and each person, if any,
    controlling Morgan Stanley or any of its affiliates against
    certain liabilities and expenses, including certain liabilities
    under the federal securities laws, related to or arising out of
    Morgan Stanleys engagement.
 
    For a more complete description of Morgan Stanleys
    opinion, see The Merger  Opinion of Financial
    Advisor to the SIRIUS Board of Directors beginning on
    page 25. See also Annex B to this Proxy Statement.
 
    XM
    Financial Advisor
 
    The XM board of directors considered the analyses of
    J.P. Morgan Securities Inc., and JPMorgan rendered its oral
    opinion that, as of February 18, 2007 and based upon and
    subject to the factors and assumptions set forth in its opinion,
    the exchange ratio in the merger was fair, from a financial
    point of view, to the holders of XM common stock. JPMorgan
    subsequently confirmed its oral opinion by delivering its
    written opinion, dated February 20, 2007, the full text of
    which is attached as Annex C to this Proxy Statement. You
    are urged to read the opinion carefully in its entirety for a
    description of the assumptions on the review undertaken.
 
    JPMorgan provided its opinion for the use and benefit of the XM
    board of directors in connection with its consideration of the
    merger. The JPMorgan opinion is not intended to be and does not
    constitute a recommendation to any stockholder as to how that
    stockholder should vote or act with respect to the proposed
    merger or any other matter described in this Proxy Statement.
    JPMorgan was not requested to opine as to, and its opinion does
    not in any manner address, XMs underlying business
    decision to proceed with or effect the merger. The summary of
    the JPMorgan opinion in this Proxy Statement is qualified in its
    entirety by reference to the full text of the opinion.
 
    For services rendered in connection with the merger (including
    the delivery of its opinion), XM has agreed to pay JPMorgan
    $12,500,000, a substantial portion of which is dependent on
    completion of the merger. In addition, XM has agreed to
    reimburse JPMorgan for its expenses incurred in connection with
    its services, including the fees and disbursements of counsel,
    and will indemnify JPMorgan against certain liabilities,
    including liabilities arising under the federal securities laws.
 
    For a more complete description of the JPMorgan opinion, see
    The Merger  Opinion of Financial Advisor to the
    XM Board of Directors beginning on page 34. See also
    Annex C to this Proxy Statement.
 
    Interests
    of Directors and Executive Officers in the Merger
 
    You should be aware that some of the directors and officers of
    SIRIUS and XM have interests in the merger that are different
    from, or are in addition to, the interests of stockholders
    generally. These interests relate to the treatment of
    equity-based compensation awards held by directors and executive
    officers of XM in the merger, the appointment of Gary M.
    Parsons, currently XMs chairman, as chairman of the board
    of directors of the combined company, the appointment of Mel
    Karmazin, currently CEO and member of the board of directors of
    SIRIUS, as CEO of the combined company, the appointment of six
    designees of XM (which may be existing XM directors) and four
    SIRIUS designees (which may be existing SIRIUS directors) as
    directors of the combined company after the merger,
    change-in-control
    severance arrangements covering XMs executive officers and
    one SIRIUS executive officer, general severance provisions for
    other SIRIUS executive officers and the indemnification of
    XMs and SIRIUS directors and officers by SIRIUS.
 
    For a further discussion of interests of directors and executive
    officers in the merger, see The Merger 
    Interests of Directors and Executive Officers in the
    Merger beginning on page 41.
 
    Material
    U.S. Federal Income Tax Consequences of the Merger
 
    XM and SIRIUS intend for the merger to qualify as a
    reorganization within the meaning of Section 368(a) of the
    Code for U.S. federal income tax purposes. Assuming the
    merger qualifies for such treatment, a holder of XM common stock
    generally will not recognize any gain or loss for
    U.S. federal income tax purposes upon the exchange of the
    holders shares of XM common stock for shares of SIRIUS
    common stock pursuant to the merger. It is a
 
    
    4
 
    condition to each of XMs and SIRIUS respective
    obligations to complete the merger that it receives a separate
    legal opinion, at the effective time of the merger, that the
    merger will be treated as a reorganization within the meaning of
    Section 368(a) of the Code for U.S. federal income tax
    purposes.
 
    For a more complete description of the material
    U.S. federal income tax consequences of the merger, see
    Material U.S. Federal Income Tax Consequences
    beginning on page 48.
 
    The tax consequences of the merger to you may depend on your own
    situation. In addition, you may be subject to state, local or
    foreign tax laws that are not addressed in this Proxy Statement.
    You are urged to consult with your own tax advisor for a full
    understanding of the tax consequences of the merger to you.
 
    Accounting
    Treatment of the Merger
 
    The merger will be accounted for as an acquisition by SIRIUS of
    XM under the purchase method of accounting according to
    U.S. generally accepted accounting principles.
 
    No
    Appraisal Rights
 
    Under Section 262 of the General Corporation Law of the
    State of Delaware, the holders of SIRIUS common stock and the
    holders of XM common stock do not have appraisal rights in
    connection with the merger. However, the holder of XM
    Series A convertible preferred stock will have the right to
    seek appraisal of the fair value of its shares under the
    Delaware General Corporation Law.
 
    Regulatory
    Matters
 
    FCC Approval.  Both XM and SIRIUS are subject
    to regulation by the Federal Communications Commission, which we
    refer to as the FCC, and the FCC must approve the transfer to
    the combined company of control of certain licenses held by XM
    and SIRIUS or their respective subsidiaries as a result of the
    merger. As part of the approval process, the FCC released a
    public notice seeking comments on the consolidated application
    for authority to transfer control that SIRIUS and XM filed on
    March 20, 2007 and released a notice of proposed rule
    making seeking public comments on whether language prohibiting
    the transfer of control of both satellite radio licenses to a
    single entity in a 1997 order is a rule and if so whether the
    rule should be changed to allow the merger. While we believe
    that this approval will be obtained, there can be no assurance
    of this or that burdensome conditions will not be imposed as a
    condition of this approval. If such conditions would,
    individually or in the aggregate, reasonably be expected to have
    a material adverse effect on the combined company following the
    merger, the parties may determine not to proceed with the
    merger. This FCC approval may not be obtained before our
    stockholders vote on the merger. Each partys obligations
    to complete the merger are subject to receipt of FCC approval.
 
    United States Antitrust Approval.  The merger
    is also subject to the expiration or termination of the
    applicable waiting period under the U.S. antitrust laws.
    The merger agreement requires SIRIUS and XM to satisfy any
    conditions or divestiture requirements imposed upon them by
    regulatory authorities, unless the conditions or divestitures
    would reasonably be expected to have a material adverse effect
    on the combined company after completion of the merger. Subject
    to the terms and conditions of the merger agreement, each party
    will use its reasonable best efforts to prepare and file as
    promptly as practicable all documentation to effect all
    necessary applications, notices, filings and other documents and
    to obtain, as promptly as practicable, the required regulatory
    approvals in order to consummate the merger or any of the other
    transactions contemplated by the merger agreement.
 
    For a more complete discussion of regulatory matters relating to
    the merger, see The Merger  Regulatory
    Approvals Required for the Merger beginning on
    page 45.
 
    Conditions
    to Completion of the Merger
 
    We expect to complete the merger after all the conditions to the
    merger in the merger agreement are satisfied or waived,
    including after we receive stockholder approvals at the special
    meetings of SIRIUS and XM and receive all required regulatory
    approvals. We currently expect to complete the merger by the end
    of 2007. However, it is
 
    
    5
 
    possible that factors outside of our control could require us to
    complete the merger at a later time or not to complete it at all.
 
    Each partys obligation to complete the merger is subject
    to the satisfaction or waiver of various conditions, including
    the following:
 
    |  |  |  | 
    |  |  | receipt of the required stockholder approvals; | 
|  | 
    |  |  | receipt of NASDAQ authorization for listing of SIRIUS common
    stock to be issued in the merger or reserved for issuance upon
    exercise of converted XM equity awards; | 
|  | 
    |  |  | receipt of FCC approval for the merger; | 
|  | 
    |  |  | expiration or termination of the waiting period under
    U.S. antitrust laws; | 
|  | 
    |  |  | receipt of any other required regulatory approvals; | 
|  | 
    |  |  | the SEC declaring effective the registration statement, of which
    this Proxy Statement is a part, and the registration statement
    not being subject to any stop order or threatened stop order; | 
|  | 
    |  |  | no injunctions, restraints, legal restraints or prohibitions
    preventing the consummation of the merger; | 
|  | 
    |  |  | no action taken by any governmental entity, or other
    circumstance, which imposes any restriction upon SIRIUS or the
    combined company which would have a material adverse effect on
    SIRIUS after the effective time of the merger; | 
|  | 
    |  |  | accuracy of the other partys representations and
    warranties in the merger agreement, including their
    representation that no material adverse change has occurred; | 
|  | 
    |  |  | the other partys compliance with its obligations under the
    merger agreement; and | 
|  | 
    |  |  | receipt of opinions of counsel relating to the U.S. federal
    income tax treatment of the merger. | 
 
    The merger agreement provides that any or all of these
    conditions may be waived, in whole or in part, by SIRIUS or XM,
    to the extent legally allowed. Neither XM nor SIRIUS currently
    expects to waive any material condition to the completion of the
    merger. If either SIRIUS or XM determines to waive any condition
    to the merger that would result in a material and adverse change
    in the terms of the merger to XM or SIRIUS stockholders
    (including any change in the tax consequences of the transaction
    to XM stockholders), proxies would be resolicited from the
    SIRIUS or XM stockholders, as applicable. For a more complete
    discussion of the conditions to the merger, see The Merger
    Agreement  Conditions to Completion of the
    Merger beginning on page 54.
 
    Debt
    Restructuring
 
    As a result of the merger, an offer to repurchase a significant
    portion of XMs outstanding debt at 101% of the principal
    amount thereof may be required and additional funds to finance
    the repurchase may not be available on terms favorable to the
    combined company or at all. Any required repurchase offers would
    likely be financed with other debt. At March 31, 2007, the
    aggregate principal amount of XMs outstanding notes was
    $1,464 million and none of XMs outstanding notes were
    trading above 101% of the outstanding principal amount. We
    believe that if the notes are trading above 101% at the time of
    any repurchase offer, a large majority of the holders would be
    unlikely to sell their notes to XM in the repurchase offer.
    Moreover, SIRIUS may consider repurchasing outstanding debt in
    connection with the merger. Any repurchase would likely be
    financed with other debt. At March 31, 2007, the aggregate
    principal amount of SIRIUS outstanding notes was
    $1,493 million.
 
    Timing of
    the Merger
 
    The merger is expected to be completed by the end of 2007,
    subject to the receipt of necessary regulatory approvals and the
    satisfaction or waiver of other closing conditions. For a
    discussion of the timing of the merger, see The Merger
    Agreement  Closing and Effective Time of the
    Merger beginning on page 50.
 
    
    6
 
 
    No
    Solicitation of Other Offers
 
    In the merger agreement, each of XM and SIRIUS has agreed that
    it will not directly or indirectly:
 
    |  |  |  | 
    |  |  | solicit, initiate, encourage or knowingly facilitate any
    acquisition proposal; | 
|  | 
    |  |  | participate in any discussions or negotiations regarding, or
    furnish to any person any confidential information in connection
    with, or knowingly facilitate any effort or attempt to make or
    implement, an acquisition proposal; or | 
|  | 
    |  |  | approve or recommend, or enter into, any letter of intent,
    merger agreement, option agreement or other similar agreement
    related to any acquisition proposal or propose or agree to do
    any of the foregoing. | 
 
    The merger agreement does not, however, prohibit either party
    from considering a bona fide acquisition proposal from a third
    party if certain specified conditions are met. For a discussion
    of the prohibition on solicitation of acquisition proposals from
    third parties, see The Merger Agreement  No
    Solicitation beginning on page 56.
 
    Termination
    of the Merger Agreement
 
    Generally, the merger agreement may be terminated and the merger
    may be abandoned at any time prior to the completion of the
    merger (including after stockholder approval):
 
    |  |  |  | 
    |  |  | by mutual written consent of SIRIUS and XM; or | 
|  | 
    |  |  | by either party, if: | 
 
    |  |  |  | 
    |  |  | a governmental entity that must grant a requisite regulatory
    approval has denied approval of the merger and the denial has
    become final and non-appealable, or any governmental entity
    issues an order, decree or ruling or taken any other action
    permanently restraining, enjoining or otherwise prohibiting the
    merger, and such order, decree, ruling or other action has
    become final and non-appealable; | 
|  | 
    |  |  | the merger is not consummated on or before March 1, 2008; | 
|  | 
    |  |  | the other party breached any of the agreements or
    representations in the merger agreement, in a way that the
    related condition to closing would not be satisfied, and this
    breach is either incurable or not cured within 45 days; | 
|  | 
    |  |  | the required approval by the stockholders of SIRIUS or XM has
    not been obtained at the respective stockholders meeting or any
    adjournment or postponement thereof; or | 
|  | 
    |  |  | the board of directors of the other party changes its
    recommendation that its stockholders vote in favor of the merger. | 
 
    In several circumstances involving a termination after a change
    in the recommendation of the board of directors of SIRIUS or XM
    to their stockholders, either of XM or SIRIUS may be required to
    pay a termination fee to the other of $175 million. The
    termination fee could discourage other companies from seeking to
    acquire or merge with either XM or SIRIUS. See The Merger
    Agreement  Termination,
     Effect of Termination and
     Termination Fees and Expenses beginning
    on pages 57 and 58, respectively.
 
    Matters
    to be Considered at the Special Meetings
 
    SIRIUS
 
    SIRIUS stockholders will be asked to vote on the following
    proposals:
 
    |  |  |  | 
    |  |  | to amend SIRIUS certificate of incorporation to increase
    the number of authorized shares of SIRIUS common stock in
    connection with the merger, which is referred to in this Proxy
    Statement as the Charter Amendment; | 
|  | 
    |  |  | to approve the issuance of SIRIUS common stock, par value $0.001
    per share, and a new series of SIRIUS preferred stock in the
    merger, which is referred to in this Proxy Statement as the
    Share Issuance; | 
 
    
    7
 
 
    |  |  |  | 
    |  |  | to approve any motion to adjourn or postpone the SIRIUS special
    meeting to another time or place, if necessary, to solicit
    additional proxies; and | 
|  | 
    |  |  | to conduct any other business that properly comes before the
    SIRIUS special meeting or any adjournment or postponement
    thereof. | 
 
    The first two proposals listed above relating to the merger are
    conditioned upon each other and the approval of each such
    proposal is required for completion of the merger.
 
    The SIRIUS board of directors recommends that SIRIUS
    stockholders vote FOR all of the proposals set forth above, as
    more fully described under SIRIUS Special Meeting
    beginning on page 62.
 
    XM
 
    XM stockholders will be asked to vote on the following proposals:
 
    |  |  |  | 
    |  |  | to adopt the merger agreement, which is referred to in this
    Proxy Statement as the Merger Proposal; | 
|  | 
    |  |  | to approve any motion to adjourn or postpone the XM special
    meeting to another time or place, if necessary, to solicit
    additional proxies; and | 
|  | 
    |  |  | to conduct any other business that properly comes before the XM
    special meeting and any adjournment or postponement thereof. | 
 
    The XM board of directors recommends that XM stockholders vote
    FOR all of the proposals set forth above, as more fully
    described under XM Special Meeting beginning on
    page 67.
 
    Voting by
    SIRIUS and XM Directors and Executive Officers
 
    On          ,
    2007, the record date set by the SIRIUS board of directors,
    directors and executive officers of SIRIUS and their affiliates
    owned and were entitled to vote    shares of
    SIRIUS common stock, or
    approximately     %, of the total
    voting power of the shares of SIRIUS common stock outstanding on
    that date.
    On          ,
    2007, the record date set by the XM board of directors,
    directors and executive officers of XM and their affiliates
    owned and were entitled to vote    shares of
    XM common stock, or approximately     %
    of the shares of XM common stock outstanding on that date.
 
    
    8
 
 
    SELECTED
    HISTORICAL FINANCIAL DATA OF SIRIUS
 
    The following table sets forth certain of SIRIUS
    consolidated financial data as of and for each of the periods
    indicated. The financial information for the year ended
    December 31, 2002, 2003, 2004, 2005 and 2006, and as of
    December 31, 2002, 2003, 2004, 2005 and 2006 is derived
    from SIRIUS audited consolidated financial statements
    which are incorporated by reference into this Proxy Statement.
    The consolidated financial information as of and for the
    three-month periods ended March 31, 2006 and 2007 is
    derived from SIRIUS unaudited consolidated financial
    statements incorporated by reference into this Proxy Statement.
    In SIRIUS opinion, such unaudited consolidated financial
    statements include all adjustments (consisting of normal
    recurring adjustments) necessary for a fair presentation of our
    financial position and results of operations for such periods.
    Interim results for the three months ended March 31, 2007
    are not necessarily indicative of, and are not projections for,
    the results to be expected for the full year ending
    December 31, 2007.
 
    The selected historical financial data below should be read in
    conjunction with the consolidated financial statements that are
    incorporated by reference into this document and their
    accompanying notes.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | Three Months Ended 
 |  | 
|  |  | Year Ended December 31, |  |  | March 31, |  | 
|  |  | 2002 |  |  | 2003 |  |  | 2004 |  |  | 2005 |  |  | 2006 |  |  | 2006 |  |  | 2007 |  | 
|  |  | (In thousands, except per share amounts) |  | 
|  | 
| 
    Statements of Operations
    Data:
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total revenue
    
 |  | $ | 805 |  |  | $ | 12,872 |  |  | $ | 66,854 |  |  | $ | 242,245 |  |  | $ | 637,235 |  |  | $ | 126,664 |  |  | $ | 204,037 |  | 
| 
    Loss from operations
    
 |  |  | (313,127 | ) |  |  | (437,530 | ) |  |  | (678,304 | ) |  |  | (829,140 | ) |  |  | (1,067,724 | ) |  |  | (446,169 | ) |  |  | (135,045 | ) | 
| 
    Net loss(1)
    
 |  |  | (422,481 | ) |  |  | (226,215 | ) |  |  | (712,162 | ) |  |  | (862,997 | ) |  |  | (1,104,867 | ) |  |  | (458,544 | ) |  |  | (144,745 | ) | 
| 
    Net loss applicable to common
    stockholders(1)
    
 |  |  | (468,466 | ) |  |  | (314,423 | ) |  |  | (712,162 | ) |  |  | (862,997 | ) |  |  | (1,104,867 | ) |  |  | (458,544 | ) |  |  | (144,745 | ) | 
| 
    Net loss per share applicable to
    common stockholders (basic and diluted)
    
 |  | $ | (6.13 | ) |  | $ | (0.38 | ) |  | $ | (0.57 | ) |  | $ | (0.65 | ) |  | $ | (0.79 | ) |  | $ | (0.33 | ) |  | $ | (0.10 | ) | 
| 
    Weighted average common shares
    outstanding (basic and diluted)
    
 |  |  | 76,394 |  |  |  | 827,186 |  |  |  | 1,238,585 |  |  |  | 1,325,739 |  |  |  | 1,402,619 |  |  |  | 1,386,982 |  |  |  | 1,457,011 |  | 
| 
    Balance Sheet Data:
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Cash and cash equivalents
    
 |  | $ | 18,375 |  |  | $ | 520,979 |  |  | $ | 753,891 |  |  | $ | 762,007 |  |  | $ | 393,421 |  |  | $ | 630,831 |  |  | $ | 259,162 |  | 
| 
    Marketable securities
    
 |  |  | 155,327 |  |  |  | 28,904 |  |  |  | 5,277 |  |  |  | 117,250 |  |  |  | 15,500 |  |  |  | 84,400 |  |  |  | 4,650 |  | 
| 
    Restricted investments
    
 |  |  | 7,200 |  |  |  | 8,747 |  |  |  | 97,321 |  |  |  | 107,615 |  |  |  | 77,850 |  |  |  | 108,315 |  |  |  | 78,160 |  | 
| 
    Total assets
    
 |  |  | 1,340,940 |  |  |  | 1,617,317 |  |  |  | 1,957,613 |  |  |  | 2,085,362 |  |  |  | 1,658,528 |  |  |  | 1,908,104 |  |  |  | 1,506,147 |  | 
| 
    Long-term debt, net of current
    portion
    
 |  |  | 670,357 |  |  |  | 194,803 |  |  |  | 656,274 |  |  |  | 1,084,437 |  |  |  | 1,068,249 |  |  |  | 1,083,929 |  |  |  | 1,067,339 |  | 
| 
    Accrued interest, net of current
    portion
    
 |  |  | 46,914 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Preferred stock
    
 |  |  | 531,153 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Accumulated deficit
    
 |  |  | (927,479 | ) |  |  | (1,153,694 | ) |  |  | (1,865,856 | ) |  |  | (2,728,853 | ) |  |  | (3,833,720 | ) |  |  | (3,187,397 | ) |  |  | (3,978,465 | ) | 
| 
    Stockholders (deficit)
    equity(2)
    
 |  |  | 36,846 |  |  |  | 1,325,194 |  |  |  | 1,000,633 |  |  |  | 324,968 |  |  |  | (389,071 | ) |  |  | 134,703 |  |  |  | (421,910 | ) | 
 
 
    |  |  |  | 
    | (1) |  | Net loss and net loss applicable to common stockholders for the
    year ended December 31, 2003 included other income of
    $256,538 related to our debt restructuring. | 
|  | 
    | (2) |  | No cash dividends were declared or paid in any of the periods
    presented. | 
 
    
    9
 
 
    SELECTED
    HISTORICAL FINANCIAL DATA OF XM
 
    The following table sets forth certain of XMs consolidated
    financial data as of and for each of the periods indicated. The
    financial information for the year ended December 31, 2002,
    2003, 2004, 2005 and 2006, and as of December 31, 2002,
    2003, 2004, 2005 and 2006 is derived from XMs audited
    consolidated financial statements which are incorporated by
    reference into this Proxy Statement. The consolidated financial
    information as of and for the three-month periods ended
    March 31, 2006 and 2007 is derived from XMs unaudited
    consolidated financial statements incorporated by reference into
    this Proxy Statement. In XMs opinion, such unaudited
    consolidated financial statements include all adjustments
    (consisting of normal recurring adjustments) necessary for a
    fair presentation of XMs financial position and results of
    operations for such periods. Interim results for the three
    months ended March 31, 2007 are not necessarily indicative
    of, and are not projections for, the results to be expected for
    the full year ending December 31, 2007.
 
    The selected historical financial data below should be read in
    conjunction with the consolidated financial statements that are
    incorporated by reference into this document and their
    accompanying notes.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  | Year Ended December 31, |  |  | Three Months Ended March 31, |  | 
|  |  | 2002 |  |  | 2003 |  |  | 2004 |  |  | 2005 |  |  | 2006 |  |  | 2006 |  |  | 2007 |  | 
|  |  | (In thousands, except per share amounts) |  | 
|  | 
| 
    Statements of Operations
    Data:
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total revenue
    
 |  | $ | 20,181 |  |  | $ | 91,781 |  |  | $ | 244,443 |  |  | $ | 558,266 |  |  | $ | 933,417 |  |  | $ | 207,966 |  |  | $ | 264,112 |  | 
| 
    Loss from operations
    
 |  |  | (438,780 | ) |  |  | (454,458 | ) |  |  | (461,041 | ) |  |  | (555,535 | ) |  |  | (403,098 | ) |  |  | (100,796 | ) |  |  | (88,046 | ) | 
| 
    Net loss(1)
    
 |  |  | (495,012 | ) |  |  | (584,535 | ) |  |  | (642,368 | ) |  |  | (666,715 | ) |  |  | (718,872 | ) |  |  | (149,221 | ) |  |  | (122,438 | ) | 
| 
    Net loss applicable to common
    stockholders(1)
    
 |  |  | (515,871 | ) |  |  | (604,880 | ) |  |  | (651,170 | ) |  |  | (675,312 | ) |  |  | (731,692 | ) |  |  | (151,370 | ) |  |  | (122,438 | ) | 
| 
    Net loss per share applicable to
    common stockholders (basic and diluted)
    
 |  | $ | (5.95 | ) |  | $ | (4.83 | ) |  | $ | (3.30 | ) |  | $ | (3.07 | ) |  | $ | (2.70 | ) |  | $ | (0.60 | ) |  | $ | (0.40 | ) | 
| 
    Weighted average common shares
    outstanding (basic and diluted)
    
 |  |  | 86,735 |  |  |  | 125,176 |  |  |  | 197,318 |  |  |  | 219,620 |  |  |  | 270,587 |  |  |  | 253,213 |  |  |  | 305,878 |  | 
| 
    Balance Sheet Data:
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Cash and cash equivalents
    
 |  | $ | 32,818 |  |  | $ | 418,307 |  |  | $ | 717,867 |  |  | $ | 710,991 |  |  | $ | 218,216 |  |  | $ | 520,820 |  |  | $ | 319,391 |  | 
| 
    Marketable securities
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,006 |  |  |  | 5,860 |  |  |  | 24,191 |  |  |  | 5,985 |  | 
| 
    Restricted investments
    
 |  |  | 29,742 |  |  |  | 4,151 |  |  |  | 4,492 |  |  |  | 5,438 |  |  |  | 2,098 |  |  |  | 5,418 |  |  |  | 396 |  | 
| 
    Total assets
    
 |  |  | 1,160,280 |  |  |  | 1,526,782 |  |  |  | 1,821,635 |  |  |  | 2,223,661 |  |  |  | 1,840,618 |  |  |  | 2,010,969 |  |  |  | 1,943,164 |  | 
| 
    Long-term debt, net of current
    portion
    
 |  |  | 412,540 |  |  |  | 743,254 |  |  |  | 948,741 |  |  |  | 1,035,584 |  |  |  | 1,286,179 |  |  |  | 995,165 |  |  |  | 1,478,936 |  | 
| 
    Preferred stock
    
 |  |  | 119 |  |  |  | 114 |  |  |  | 60 |  |  |  | 60 |  |  |  | 54 |  |  |  | 60 |  |  |  | 54 |  | 
| 
    Accumulated deficit
    
 |  |  | (885,986 | ) |  |  | (1,470,521 | ) |  |  | (2,112,889 | ) |  |  | (2,779,604 | ) |  |  | (3,498,476 | ) |  |  | (2,928,825 | ) |  |  | (3,620,914 | ) | 
| 
    Stockholders (deficit)
    equity(2)
    
 |  |  | 592,311 |  |  |  | 532,888 |  |  |  | 336,163 |  |  |  | 80,948 |  |  |  | (397,880 | ) |  |  | 11,375 |  |  |  | (504,373 | ) | 
 
 
    |  |  |  | 
    | (1) |  | Net loss and net loss applicable to common stockholders includes
    stock dividends and retirement losses relating to Series B
    and C preferred stock. | 
|  | 
    | (2) |  | No cash dividends were declared or paid in any of the periods
    presented. | 
 
    
    10
 
 
    SUMMARY
    UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL DATA
 
    The following summary unaudited pro forma condensed combined
    financial information is designed to show how the merger of
    SIRIUS and XM might have affected historical financial
    statements if the merger had been completed at an earlier time
    and was prepared based on the historical financial results
    reported by SIRIUS and XM. The following should be read in
    connection with Unaudited Pro Forma Condensed Combined
    Financial Statements beginning on page 70 and the
    SIRIUS and XM audited consolidated financial statements, which
    are incorporated by reference into this Proxy Statement.
 
    The unaudited pro forma balance sheet data assumes that the
    merger took place on March 31, 2007 and combines
    SIRIUS consolidated balance sheet as of March 31,
    2007 with XMs consolidated balance sheet as of
    March 31, 2007. The unaudited pro forma statements of
    operations data for the three months ended March 31, 2007
    and for the year ended December 31, 2006 give effect to the
    merger as if it occurred on January 1, 2006.
 
    The pro forma condensed combined financial data is presented for
    illustrative purposes only and is not necessarily indicative of
    the financial condition or results of operations of future
    periods or the financial condition or results of operations that
    actually would have been realized had the entities been a single
    company during these periods.
 
    |  |  |  |  |  |  |  |  |  | 
|  |  | Year Ended 
 |  |  | Three Months Ended 
 |  | 
|  |  | December 31, 
 |  |  | March 31, 
 |  | 
|  |  | 2006 |  |  | 2007 |  | 
|  |  | (In thousands, except per share amounts) |  | 
|  | 
| 
    Statements of Operations
    Data:
 |  |  |  |  |  |  |  |  | 
| 
    Total revenue
    
 |  | $ | 1,570,652 |  |  | $ | 468,149 |  | 
| 
    Loss from operations
    
 |  |  | (1,598,489 | ) |  |  | (255,008 | ) | 
| 
    Net loss
    
 |  |  | (1,934,639 | ) |  |  | (294,908 | ) | 
| 
    Net loss applicable to common
    stockholders
    
 |  |  | (1,947,459 | ) |  |  | (294,908 | ) | 
| 
    Net loss per share applicable to
    common stockholders (basic and diluted)
    
 |  | $ | (0.73 | ) |  | $ | (0.10 | ) | 
| 
    Weighted average common shares
    outstanding (basic and diluted)
    
 |  |  | 2,663,151 |  |  |  | 2,879,881 |  | 
 
    |  |  |  |  |  | 
|  |  | As of 
 |  | 
|  |  | March 31, 
 |  | 
|  |  | 2007 |  | 
|  |  | (In thousands) |  | 
|  | 
| 
    Balance Sheet Data:
 |  |  |  |  | 
| 
    Cash and cash equivalents
    
 |  | $ | 578,553 |  | 
| 
    Marketable securities
    
 |  |  | 10,635 |  | 
| 
    Restricted investments
    
 |  |  | 78,556 |  | 
| 
    Total assets
    
 |  |  | 10,029,063 |  | 
| 
    Long-term debt, net of current
    portion
    
 |  |  | 2,591,494 |  | 
| 
    Preferred stock
    
 |  |  | 25 |  | 
| 
    Accumulated deficit
    
 |  |  | (3,978,465 | ) | 
| 
    Stockholders equity
    
 |  |  | 5,099,804 |  | 
 
    
    11
 
 
    COMPARATIVE
    PER SHARE DATA (UNAUDITED)
 
    The following table shows per share data regarding loss from
    continuing operations, book value per share and cash dividends
    for SIRIUS and XM on a historical, pro forma combined basis. The
    pro forma book value per share information was computed as if
    the merger had been completed on March 31, 2007. The pro
    forma loss from continuing operations information was computed
    as if the merger had been completed on January 1, 2006. The
    XM pro forma equivalent information was calculated by
    multiplying the corresponding pro forma combined data by the
    exchange ratio of 4.6 to 1.0. This information shows how each
    share of XM common stock would have participated in the combined
    companies losses from continuing operations and book value
    per share if the merger had been completed on the relevant
    dates. These amounts do not necessarily reflect future per share
    amounts of earnings (losses) from continuing operations and book
    value per share of the combined company.
 
    The following unaudited comparative per share data is derived
    from the historical consolidated financial statements of each of
    SIRIUS and XM. The information below should be read in
    conjunction with the audited consolidated financial statements
    and accompanying notes of SIRIUS and XM, which are incorporated
    by reference into this Proxy Statement. We urge you also to read
    Unaudited Pro Forma Condensed Combined Financial
    Statements beginning on page 70.
 
    |  |  |  |  |  |  |  |  |  | 
|  |  | As of and 
 |  |  | As of and 
 |  | 
|  |  | For the Year 
 |  |  | For the Three 
 |  | 
|  |  | Ended 
 |  |  | Months Ended 
 |  | 
|  |  | December 31, 
 |  |  | March 31, 
 |  | 
|  |  | 2006 |  |  | 2007 |  | 
|  | 
| 
    Sirius Satellite Radio
    Inc.
 |  |  |  |  |  |  |  |  | 
| 
    Loss from continuing operations
    per common share  basic and diluted
    
 |  | $ | (0.79 | ) |  | $ | (0.10 | ) | 
| 
    Book value per share
    
 |  |  | (0.27 | ) |  |  | (0.29 | ) | 
| 
    Cash dividends
    
 |  |  |  |  |  |  |  |  | 
| 
    XM Satellite Radio Holdings
    Inc.
    
 |  |  |  |  |  |  |  |  | 
| 
    Loss from continuing operations
    per common share  basic and diluted
    
 |  | $ | (2.70 | ) |  | $ | (0.40 | ) | 
| 
    Book value per share
    
 |  |  | (1.30 | ) |  |  | (1.65 | ) | 
| 
    Cash dividends
    
 |  |  |  |  |  |  |  |  | 
| 
    Sirius Satellite Radio Inc. Pro
    Forma Combined
 |  |  |  |  |  |  |  |  | 
| 
    Loss from continuing operations
    per common share  basic and diluted
    
 |  | $ | (0.73 | ) |  | $ | (0.10 | ) | 
| 
    Book value per share
    
 |  |  | N/A |  |  |  | (1.77 | ) | 
| 
    Cash dividends
    
 |  |  |  |  |  |  |  |  | 
 
    
    12
 
 
    MARKET
    PRICES AND DIVIDENDS AND OTHER DISTRIBUTIONS
 
    Stock
    Prices
 
    The table below sets forth, for the calendar quarters indicated,
    the high and low sales prices per share of SIRIUS common stock
    and XM common stock, both of which trade on the NASDAQ Global
    Select Market under the symbol SIRI and
    XMSR, respectively.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  | SIRIUS Common Stock |  |  | XM Common Stock |  | 
|  |  | High |  |  | Low |  |  | High |  |  | Low |  | 
|  | 
| 
    2005
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    First Quarter
    
 |  | $ | 7.85 |  |  | $ | 5.13 |  |  | $ | 38.28 |  |  | $ | 27.99 |  | 
| 
    Second Quarter
    
 |  |  | 6.80 |  |  |  | 4.42 |  |  |  | 34.83 |  |  |  | 26.16 |  | 
| 
    Third Quarter
    
 |  |  | 7.61 |  |  |  | 6.20 |  |  |  | 37.31 |  |  |  | 32.57 |  | 
| 
    Fourth Quarter
    
 |  |  | 7.98 |  |  |  | 5.70 |  |  |  | 36.91 |  |  |  | 26.99 |  | 
| 
    2006
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    First Quarter
    
 |  |  | 6.82 |  |  |  | 4.36 |  |  |  | 30.46 |  |  |  | 19.66 |  | 
| 
    Second Quarter
    
 |  |  | 5.57 |  |  |  | 3.60 |  |  |  | 24.21 |  |  |  | 12.77 |  | 
| 
    Third Quarter
    
 |  |  | 4.77 |  |  |  | 3.62 |  |  |  | 14.98 |  |  |  | 9.63 |  | 
| 
    Fourth Quarter
    
 |  |  | 4.37 |  |  |  | 3.50 |  |  |  | 16.08 |  |  |  | 9.91 |  | 
| 
    2007
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    First Quarter
    
 |  |  | 4.26 |  |  |  | 3.18 |  |  |  | 17.70 |  |  |  | 12.80 |  | 
| 
    Second Quarter
    
 |  |  | 3.25 |  |  |  | 2.66 |  |  |  | 13.04 |  |  |  | 10.37 |  | 
| 
    Third Quarter (through
    July 24, 2007)
    
 |  |  | 3.28 |  |  |  | 2.96 |  |  |  | 13.31 |  |  |  | 11.51 |  | 
 
    On February 16, 2007, the last trading day before the
    public announcement of the signing of the merger agreement, the
    sales price per share of SIRIUS common stock was $3.70 and the
    last sales price per share of XM common stock was $13.98, in
    each case on the NASDAQ Global Select Market.
    On          ,
    2007, the latest practicable date before the date of this Proxy
    Statement, the last sales price per share of SIRIUS common stock
    was $      and the last sales price per
    share of XM common stock was $      ,
    in each case on the NASDAQ Global Select Market.
 
    Dividends
    and Other Distributions
 
    SIRIUS has never paid cash dividends on its common stock. It
    currently intends to retain earnings, if any, for use in its
    business and does not anticipate paying any cash dividends in
    the foreseeable future. SIRIUS
    95/8% Senior
    Notes due 2013 and the terms of its credit facilities restrict
    its ability to pay dividends.
 
    XM has never paid any dividends on its common stock. XM
    Satellite Radio Inc., a subsidiary of XM, is restricted by the
    indentures governing its senior notes from paying dividends to
    XM, which, in turn, significantly limits XMs ability to
    pay dividends. XM does not intend to pay cash dividends on its
    common stock in the foreseeable future.
 
    The board of directors of the combined company will determine
    the new dividend policy, but it is expected that no dividends
    will be paid in the foreseeable future.
 
    
    13
 
 
    CAUTIONARY
    STATEMENT REGARDING FORWARD-LOOKING STATEMENTS
 
    We make forward-looking statements in this Proxy Statement and
    in the documents that are incorporated by reference. These
    forward-looking statements relate to outlooks or expectations
    for earnings, revenues, expenses, asset quality or other future
    financial or business performance, strategies or expectations,
    or the impact of legal, regulatory or supervisory matters on
    business, results of operations or financial condition.
    Specifically, forward looking statements may include:
 
    |  |  |  | 
    |  |  | statements relating to the benefits of the merger, including
    anticipated synergies and cost savings estimated to result from
    the merger; | 
|  | 
    |  |  | statements relating to future business prospects, number of
    subscribers, revenue, income and financial condition; and | 
|  | 
    |  |  | statements preceded by, followed by or that include the words
    estimate, plan, project,
    forecast, intend, expect,
    anticipate, believe, seek,
    target or similar expressions. | 
 
    These statements reflect management judgment based on currently
    available information and involve a number of risks and
    uncertainties that could cause actual results to differ
    materially from those in the forward-looking statements. With
    respect to these forward-looking statements, each of XM and
    SIRIUS management has made assumptions regarding, among other
    things, subscriber and network usage, subscriber growth and
    retention, pricing, operating costs and the economic environment.
 
    Future performance cannot be ensured. Actual results may differ
    materially from those in the forward-looking statements. Some
    factors that could cause actual results to differ include:
 
    |  |  |  | 
    |  |  | the ability to obtain governmental approvals of the merger on
    the proposed terms and time schedule, and without the imposition
    of significant terms, conditions, obligations or restrictions; | 
|  | 
    |  |  | the risk that the businesses will not be integrated successfully; | 
|  | 
    |  |  | expected cost savings from the merger may not be fully realized
    within the expected time frames or at all; | 
|  | 
    |  |  | revenues following the merger may be lower than expected; | 
|  | 
    |  |  | the effects of vigorous competition in the markets in which
    SIRIUS and XM operate; | 
|  | 
    |  |  | an adverse change in the ratings afforded to debt securities by
    rating agencies or a lower rating afforded to the combined
    companys debt securities; | 
|  | 
    |  |  | the possibility of one or more of the markets in which XM and
    SIRIUS compete being impacted by changes in political or other
    factors such as monetary policy, legal and regulatory changes or
    other external factors over which they have no control; | 
|  | 
    |  |  | the ability of the combined company to obtain debt financing on
    terms favorable to it or at all, whether to complete any
    required repurchase of outstanding debt or otherwise; | 
|  | 
    |  |  | changes in general economic and market conditions; and | 
|  | 
    |  |  | other risks referenced from time to time in filings with the SEC
    and those factors listed or incorporated by reference into this
    Proxy Statement under Risk Factors beginning on
    page 15. | 
 
    You are cautioned not to place undue reliance on any
    forward-looking statements, which speak only as of the date of
    this Proxy Statement, or in the case of a document incorporated
    by reference, as of the date of that document. Except as
    required by law, neither SIRIUS nor XM undertakes any obligation
    to publicly update or release any revisions to these
    forward-looking statements to reflect any events or
    circumstances after the date hereof or to reflect the occurrence
    of unanticipated events.
 
    Additional factors that could cause actual results to differ
    materially from those expressed in the forward-looking
    statements are discussed in reports filed with the SEC by XM and
    SIRIUS. See Where You Can Find More Information
    beginning on page 91 for a list of the documents
    incorporated by reference.
 
    
    14
 
 
    RISK
    FACTORS
 
    In addition to the other information contained or
    incorporated by reference into this Proxy Statement, you should
    carefully consider the following risk factors in deciding how to
    vote on the merger. In addition, you should read and consider
    the risks associated with each of the businesses of SIRIUS and
    XM because these risks will also relate to the combined company.
    Certain of these risks can be found in the documents
    incorporated by reference into this Proxy Statement.
 
    Because
    the market price of SIRIUS common stock will fluctuate, XM
    stockholders cannot be sure of the market value of the SIRIUS
    common stock that they will receive.
 
    When we complete the merger, shares of XM common stock will be
    converted into the right to receive 4.6 shares of SIRIUS
    common stock. The exchange ratio is fixed and will not be
    adjusted for changes in the market price of either SIRIUS common
    stock or XM common stock. The merger agreement does not provide
    for any price-based termination right. Accordingly, the market
    value of the shares of SIRIUS common stock that SIRIUS grants
    and XM stockholders will be entitled to receive when we complete
    the merger will depend on the market value of shares of SIRIUS
    common stock at the time that we complete the merger and could
    vary significantly from the market value on the date of this
    Proxy Statement or the date of the XM special meeting. The
    market value of the shares of SIRIUS common stock will continue
    to fluctuate after the completion of the merger. For example,
    during the first and the second calendar quarters of 2007, the
    market price of SIRIUS common stock ranged from a low of $2.66
    to a high of $4.26, all as reported on the NASDAQ Global Select
    Market. See Market Prices and Dividends and Other
    Distributions on page 13.
 
    These variations could result from changes in the business,
    operations or prospects of XM or SIRIUS prior to or following
    the merger, regulatory considerations, general market and
    economic conditions and other factors both within and beyond the
    control of SIRIUS or XM. We may complete the merger a
    considerable period after the date of the SIRIUS special meeting
    and the XM special meeting.
 
    The
    issuance of shares of SIRIUS common stock to XM stockholders in
    the merger will substantially reduce the percentage interests of
    SIRIUS stockholders.
 
    If the merger is completed, SIRIUS will issue up to
    approximately 1.7 billion shares of SIRIUS common
    stock in the merger. Based on the number of shares of SIRIUS and
    XM common stock outstanding on the SIRIUS and XM record dates,
    XM stockholders before the merger will own, in the aggregate,
    approximately     % of the fully
    diluted shares of common stock immediately after the merger,
    excluding shares issuable upon conversion of XMs
    outstanding convertible debt. The issuance of shares of SIRIUS
    common stock to XM stockholders in the merger and to holders of
    assumed options and restricted stock units to acquire shares of
    XM common stock and warrants will cause a significant reduction
    in the relative percentage interest of current SIRIUS
    stockholders in earnings, voting, liquidation value and book and
    market value.
 
    Uncertainty
    about the merger and diversion of management could harm XM,
    SIRIUS or the combined company, whether or not the merger is
    completed.
 
    In response to the announcement of the merger, existing or
    prospective subscribers, retailers, radio manufacturers,
    automakers and programming providers of XM or SIRIUS may delay
    or defer their purchasing or other decisions concerning XM or
    SIRIUS, or they may seek to change their existing business
    relationship. In addition, as a result of the merger, current
    and prospective employees could experience uncertainty about
    their future with XM or SIRIUS or the combined company. These
    uncertainties may impair each companys ability to retain,
    recruit or motivate key personnel. Completion of the merger will
    also require a significant amount of time and attention from
    management. The diversion of management attention away from
    ongoing operations could adversely affect ongoing operations and
    business relationships.
    
    15
 
    Failure
    to complete the merger for regulatory or other reasons could
    adversely affect SIRIUS and XM stock prices and their future
    business and financial results.
 
    Completion of the merger is conditioned upon, among other
    things, the receipt of certain regulatory and antitrust
    approvals, including from the Federal Communications Commission
    and under the
    Hart-Scott-Rodino
    Antitrust Improvements Act of 1976, as amended, and approval of
    SIRIUS and XMs stockholders. There is no assurance that we
    will receive the necessary approvals or satisfy the other
    conditions to the completion of the merger. Failure to complete
    the proposed merger would prevent SIRIUS and XM from realizing
    the anticipated benefits of the merger. Each company will also
    remain liable for significant transaction costs at any time,
    including legal, accounting and financial advisory fees. In
    addition, the market price of each companys common stock
    may reflect various market assumptions as to whether the merger
    will occur. Consequently, the completion of, or failure to
    complete, the merger could result in a significant change in the
    market price of SIRIUS and XMs common stock.
 
    Any delay
    in completion of the merger may significantly reduce the
    benefits expected to be obtained from the merger.
 
    In addition to the required regulatory clearances and approvals,
    the merger is subject to a number of other conditions beyond the
    control of XM and SIRIUS that may prevent, delay or otherwise
    materially adversely affect its completion. See The
    Merger  Regulatory Approvals Required for the
    Merger beginning on page 45 and The Merger
    Agreement  Conditions to Completion of the
    Merger beginning on page 54. XM and SIRIUS cannot
    predict whether and when these other conditions will be
    satisfied. Further, the requirements for obtaining the required
    clearances and approvals could delay the completion of the
    merger for a significant period of time or prevent it from
    occurring. Any delay in completing the merger may significantly
    reduce the synergies and other benefits that SIRIUS and XM
    expect to achieve if they successfully complete the merger
    within the expected timeframe and integrate their respective
    businesses.
 
    The
    ability to complete the merger is subject to the receipt of
    consents and approvals from government entities, which may
    impose conditions that could have an adverse effect on SIRIUS or
    XM or could cause either party to abandon the merger.
 
    In deciding whether to grant regulatory or antitrust approvals,
    the relevant governmental entities will consider the effect of
    the merger on competition within their relevant jurisdictions.
    The terms and conditions of the approvals that are granted may
    impose requirements, limitations or costs or place restrictions
    on the conduct of the combined companys business.
 
    The merger agreement may require us to accept significant
    conditions from regulatory bodies before either of us may refuse
    to close the merger on the basis of those regulatory conditions.
    Neither XM nor SIRIUS can provide any assurance that either
    company will obtain the necessary approvals or that any other
    conditions, terms, obligations or restrictions will not have a
    material adverse effect on the combined company following the
    merger. In addition, we can provide no assurance that these
    conditions, terms, obligations or restrictions will not result
    in the delay or abandonment of the merger. See The
    Merger  Regulatory Approvals Required for the
    Merger beginning on page 45 and The Merger
    Agreement  Conditions to Completion of the
    Merger beginning on page 54.
 
    The
    anticipated benefits of the merger may not be realized fully or
    at all or may take longer to realize than expected.
 
    The merger involves the integration of two companies that have
    previously operated independently with principal offices in two
    distinct locations. Due to legal restrictions, SIRIUS and XM
    have conducted only limited planning regarding the integration
    of the two companies. The combined company will be required to
    devote significant management attention and resources to
    integrating the two companies. Delays in this process could
    adversely affect the combined companys business, financial
    results, financial condition and stock price. Even if SIRIUS and
    XM were able to integrate their business operations
    successfully, there can be no assurance that this integration
    will result in the realization of the full benefits of
    synergies, cost savings, innovation and operational
    
    16
 
    efficiencies that may be possible from this integration or that
    these benefits will be achieved within a reasonable period of
    time.
 
    Additionally, as a condition to their approval of the merger,
    regulatory agencies may impose requirements, limitations or
    costs or require divestitures or place restrictions on the
    conduct of the combined companys business. If SIRIUS and
    XM agree to these requirements, limitations, costs, divestitures
    or restrictions, the ability to realize the anticipated benefits
    of the merger may be impaired.
 
    Because
    certain directors and executive officers of XM and SIRIUS have
    interests in seeing the merger completed that are different than
    those of XMs and SIRIUS other stockholders, these
    persons may have conflicts of interest in recommending that XM
    and SIRIUS stockholders vote to approve the merger
    agreement.
 
    Certain directors of XM and SIRIUS have arrangements or other
    interests that provide them with interests in the merger that
    are different than those of XMs or SIRIUS other
    stockholders. For example, Mel Karmazin, the CEO of SIRIUS, who
    is also a director of SIRIUS, will, pursuant to the merger
    agreement, keep that title with the combined company and will
    remain on the board of directors of the combined company and
    Gary Parsons, the Chairman of XM, will become chairman of the
    board of directors of the combined company. In addition, up to
    six current XM directors and up to four SIRIUS directors may
    serve on the combined companys board. While other XM and
    SIRIUS directors will not become directors of the combined
    company after the merger, in either case, SIRIUS will indemnify
    and maintain liability insurance for each of the directors
    services as directors before the merger. In addition, XMs
    executive directors and one executive officer of SIRIUS have
    change in control severance protections that would entitle them
    to enhanced severance if their employment were to terminate
    following the merger under specific circumstances. In addition,
    SIRIUS has employment agreements with each of its executive
    officers, which contain provisions regarding payments upon a
    termination of employment. These and other material interests of
    the directors and executive officers of XM and SIRIUS in the
    merger that are different than those of the other XM and SIRIUS
    stockholders are described under The Merger 
    Interests of Directors and Executive Officers in the
    Merger beginning on page 41.
 
    The
    merger agreement contains provisions that could discourage a
    potential competing acquiror that might be willing to pay more
    to acquire XM or that may be willing to acquire
    SIRIUS.
 
    The merger agreement contains no shop provisions
    that restrict SIRIUS and XMs ability to solicit or
    facilitate proposals regarding a merger or similar transaction
    with another party. Further, there are only limited exceptions
    to SIRIUS or XMs agreement that their respective
    board of directors will not withdraw or adversely qualify its
    recommendation regarding the merger agreement. Although each of
    the SIRIUS and XM boards are permitted to terminate the merger
    agreement in response to a superior proposal if they determine
    that a failure to do so would be inconsistent with their
    fiduciary duties, its doing so would entitle the other party to
    collect a $175 million termination fee from the other
    party. In addition, if a third party publicly makes a proposal
    for a competing transaction with either SIRIUS or XM before the
    special meeting and its stockholders do not approve the merger,
    that party will be required to pay the other party a portion of
    the termination fee. We describe these provisions under
    The Merger Agreement  Termination
    beginning on page 57 and  Termination Fees
    and Expenses beginning on page 58.
 
    These provisions could discourage a potential competing acquiror
    from considering or proposing that acquisition, even if it were
    prepared to pay consideration with a higher value than that
    proposed to be paid in the merger, or might result in a
    potential competing acquiror proposing to pay a lower per share
    price than it might otherwise have proposed to pay because of
    the added expense of the termination fee.
 
    The
    combined company may need to refinance a substantial amount of
    indebtedness very shortly after the merger.
 
    As a result of the merger, an offer to repurchase a significant
    portion of XMs outstanding notes at 101% of the principal
    amount thereof may be required under the terms of such debt. Any
    required repurchase would likely be financed with other debt and
    debt financing to fund such repurchase may not be available on
    terms favorable to the
    
    17
 
    combined company or at all. At March 31, 2007, the
    aggregate principal amount of XMs outstanding notes was
    approximately $1.46 billion, and no outstanding notes were
    trading above 101% of the outstanding principal amount. We
    believe that if the notes are trading above 101% at the time of
    any required repurchase offer, a large majority of holders would
    be unlikely to sell their notes in the repurchase offer.
    Moreover, SIRIUS may consider repurchasing outstanding debt in
    connection with the merger. Any repurchase would likely be
    financed with other debt. At March 31, 2007, the aggregate
    principal amount of SIRIUS outstanding notes was
    approximately $1.5 billion.
 
    The
    combined companys indebtedness following the completion of
    the merger will be substantial. This indebtedness could
    adversely affect the combined company in many ways, including by
    reducing funds available for other business purposes.
 
    The pro forma indebtedness of the combined company as of
    March 31, 2007, after giving effect to the merger, would
    have been approximately $2.6 billion. As a result of this
    debt, demands on SIRIUS cash resources may increase after
    the merger. The increased levels of indebtedness could reduce
    funds available for investment in research and development and
    capital expenditures or create competitive disadvantages
    compared to other companies with lower debt levels. In addition,
    existing covenants in the SIRIUS and XM debt instruments limit
    the transfer of cash between the two companies and require that
    inter-company dealings be effected on an arms-length basis.
 
    Resales
    of shares of SIRIUS common stock following the merger and
    additional obligations to issue shares of SIRIUS common stock
    may cause the market price of SIRIUS common stock to
    fall.
 
    As of March 31, 2007, SIRIUS had approximately
    1.46 billion shares of common stock outstanding and
    approximately 167 million shares of common stock
    subject to outstanding options and other rights to purchase or
    acquire its shares. SIRIUS currently expects that it will issue
    approximately 1.70 billion shares of SIRIUS common
    stock in connection with the merger. The issuance of these new
    shares of SIRIUS common stock and the sale of additional shares
    of SIRIUS common stock that may become eligible for sale in the
    public market from time to time upon exercise of options
    (including a substantial number of SIRIUS options that will
    replace existing XM options) could have the effect of depressing
    the market price for shares of SIRIUS common stock.
 
    The
    trading price of shares of SIRIUS common stock after the merger
    may be affected by factors different from those affecting the
    price of shares of XM common stock or shares of SIRIUS common
    stock before the merger.
 
    When we complete the merger, holders of XM common stock will
    become holders of SIRIUS common stock. The results of operations
    of SIRIUS, as well as the trading price of SIRIUS common stock,
    after the merger may be affected by factors different from those
    currently affecting SIRIUS or XMs results of
    operations and the trading price of XM common stock. For a
    discussion of the businesses of XM and SIRIUS and of certain
    factors to consider in connection with those businesses, see the
    documents incorporated by reference into this Proxy Statement
    and referred to under Where You Can Find More
    Information beginning on page 91.
    
    18
 
 
    THE
    MERGER
 
    The following is a discussion of the merger and the material
    terms of the merger agreement between SIRIUS and XM. You are
    urged to read carefully the merger agreement in its entirety, a
    copy of which is attached as Annex A to this Proxy
    Statement and incorporated by reference herein.
 
    Background
    of the Merger
 
    Representatives of XM and SIRIUS first discussed the possibility
    of a business combination in late 2002 and early 2003, when XM
    and SIRIUS were experiencing certain financial challenges and
    were in the process of restructuring their respective debt and
    equity capital structures. However, XM and SIRIUS were unable to
    agree on a basis to proceed with discussions, and, as a result,
    those discussions were abandoned.
 
    In February 2006, Mel Karmazin, the CEO of SIRIUS, contacted
    Gary M. Parsons, the Chairman of XM, to propose a meeting on a
    variety of topics of interest to the two companies and, on
    March 6, 2006, Mr. Karmazin met with Mr. Parsons
    and Hugh Panero, the CEO of XM. As part of this meeting,
    Mr. Karmazin explored with Messrs. Parsons and Panero
    their interest in a possible business combination.
    Mr. Karmazin discussed in general terms why a combination
    would make sense from a business and financial perspective for
    the two companies and their stockholders. Messrs. Parsons
    and Panero agreed to reflect on the possibility of entering into
    discussions regarding a business combination, and indicated that
    they would raise the possibility of merger discussions with the
    XM board of directors. The XM board of directors was informed of
    the possibility of merger discussions with SIRIUS in March of
    2006.
 
    No further substantive discussions were held until
    September 21, 2006, when Mr. Karmazin and David Frear,
    the Executive Vice President and Chief Financial Officer of
    SIRIUS, met with Messrs. Parsons and Panero and Joseph
    Euteneuer, the Executive Vice President and Chief Financial
    Officer of XM. At this meeting, Mr. Karmazin reiterated
    SIRIUS interest in exploring a business combination with
    XM and generally discussed the possibility and benefits of
    entering into a discussion to combine their operations.
 
    Messrs. Karmazin and Frear again met with
    Messrs. Parsons and Panero on October 17, 2006.
    Mr. Parsons expressed an interest in pursuing further
    discussions, provided there was a reasonable probability that
    required regulatory approvals for a business combination would
    be secured. As part of this meeting, SIRIUS and XM agreed to
    discuss with their respective counsel the likelihood of
    obtaining the required regulatory approvals for a combination.
    In the following weeks, SIRIUS had several discussions with its
    outside legal counsel, Simpson Thacher & Bartlett LLP
    and Wiley Rein LLP, about potential regulatory issues and
    received an initial assessment of these matters from both
    counsel.
 
    On October 19, 2006, Messrs. Parsons and Panero
    briefed the XM board of directors on their meetings with SIRIUS,
    and recommended that XM retain the law firms of Jones Day and
    Latham and Watkins LLP to provide an assessment of potential
    antitrust and FCC issues, respectively. In the following weeks,
    XM had several discussions with its outside legal counsel about
    potential regulatory issues. On November 15, 2006, the XM
    board received an initial assessment of regulatory issues from
    outside counsel, and Messrs. Parsons and Panero recommended
    that XM engage an investment banking firm to evaluate the merits
    of a possible combination. Mr. Parsons described for the XM
    board the investment banking firms with whom he had already met
    and the concurring recommendation of the Finance Committee of
    the XM board of directors.
 
    In late November 2006, Messrs. Parsons, Panero and
    Euteneuer met with representatives of JPMorgan to discuss
    engaging JPMorgan to act as financial advisor to XM to evaluate
    the merits of a possible combination and to assist in
    discussions regarding a possible transaction with SIRIUS. During
    the following weeks, representatives of XM and JPMorgan met a
    number of times to review financial information regarding a
    combined XM and SIRIUS.
 
    In early December 2006, Mr. Karmazin briefed the SIRIUS
    board of directors on his upcoming meeting with management of XM
    and his desire to engage an investment banking firm, and
    described for the SIRIUS board the investment banking firms with
    whom he had already met. At this meeting, the SIRIUS board of
    directors authorized Mr. Karmazin to engage an investment
    banking firm to act as its financial advisor in connection with
    a possible
    
    19
 
    combination. On December 8, 2006, Messrs. Karmazin and
    Frear and Andreas Lazar, the Senior Vice President of Business
    Development of SIRIUS, met with representatives of Morgan
    Stanley, to discuss engaging Morgan Stanley to act as financial
    advisor to SIRIUS in discussions of a possible transaction with
    XM. On December 14, 2006, Messrs. Karmazin, Frear and
    Lazar met with Morgan Stanley to discuss the financial aspects
    of a possible merger with XM. On December 15, 2006,
    JPMorgan presented its initial analysis to the XM board of
    directors and representatives of Jones Day and Latham and
    Watkins presented an analysis of the regulatory issues to the XM
    board of directors. At various times following this meeting,
    Mr. Parsons updated the board of directors of XM
    individually on the status of discussions between the companies.
    On December 18, 2006, Messrs. Karmazin, Frear and
    Lazar again met with Morgan Stanley to review financial
    information regarding a combined SIRIUS and XM.
 
    On December 19, 2006, Messrs. Karmazin, Frear and
    representatives of Morgan Stanley met with Messrs. Parsons,
    Panero and Euteneuer of XM and representatives of JPMorgan to
    present their ideas regarding the possible structure of a
    combination with XM. At this meeting, Mr. Karmazin proposed
    that SIRIUS and XM enter into discussions regarding a
    stock-for-stock transaction on a merger of equals
    basis.
 
    On January 11, 2007, representatives of JPMorgan and Morgan
    Stanley met to discuss assumptions regarding the calculation of
    the relative equity values of XM and SIRIUS.
 
    On January 23, 2007, Mr. Karmazin discussed with the
    SIRIUS board of directors managements views regarding a
    possible business combination with XM, conversations between the
    respective financial advisors to XM and SIRIUS and expectations
    of XM regarding business valuations. After legal counsel
    reviewed with the SIRIUS board of directors the corporate and
    regulatory process anticipated in connection with a possible
    business combination with XM, the SIRIUS board of directors
    discussed at length the regulatory environment and potential
    challenges associated with seeking approval of a business
    combination with XM as well as the potential benefits and
    challenges of operating a combined enterprise.
 
    On January 29, 2007, Mr. Karmazin and representatives
    of Morgan Stanley met with Mr. Parsons and representatives
    of JPMorgan to discuss a merger of SIRIUS and XM, including the
    materials that each side would review in refining a proposal and
    analyzing the potential benefits of a business combination. On
    February 1, 2007, JPMorgan provided additional analysis to
    the XM board of directors.
 
    On February 8, 2007, Mr. Karmazin met with
    Mr. Parsons and Jack Shaw and Jeff Zients, members of the
    board of directors of XM, representatives of JPMorgan and
    representatives of Morgan Stanley. Mr. Karmazin and
    Mr. Parsons discussed a possible transaction whereby SIRIUS
    and XM would seek to negotiate a business combination on the
    basis of an exchange ratio of 4.6 shares of SIRIUS common
    stock for each share of XM common stock. Mr. Karmazin and
    Mr. Parsons agreed that each of SIRIUS and XM would
    commence detailed due diligence and contract negotiations
    promptly. At this meeting, the participants also reviewed
    financial models for a consolidated business and discussed
    various other matters. Mr. Karmazin, together with
    SIRIUS financial and legal advisors, discussed these
    developments with the SIRIUS board at a telephonic meeting on
    February 9, 2007. The SIRIUS board requested that
    management continue discussions with XM and promptly begin
    negotiating the financial terms of a possible merger.
 
    The following day, members of senior management of SIRIUS and XM
    and their respective financial advisors met telephonically to
    discuss how to proceed with the merger negotiations and to
    finalize details relating to their respective due diligence
    reviews. Around this time, SIRIUS , through its legal advisor
    Simpson Thacher, delivered a draft merger agreement to XM
    through XMs legal advisor, Skadden, Arps, Slate,
    Meagher & Flom LLP. During the following week, XM and
    SIRIUS and their respective representatives and advisors
    completed their due diligence reviews and negotiated the
    substantive terms and conditions of the merger agreement.
    Significant areas of negotiation included the scope and degree
    of reciprocity of representations and warranties and interim
    operating covenants, the conditions to closing, the terms upon
    which XM or SIRIUS could consider an alternative acquisition
    proposal and the process for dealing with any such proposal, the
    amount and triggers for payment of termination fees and various
    benefit and employee related provisions.
 
    The SIRIUS board held a lengthy telephonic meeting on
    February 18, 2007, and received reports from management on
    the status of discussions with XM and from its outside legal
    counsel about the negotiations on terms of the merger agreement.
    Simpson Thacher reviewed with the SIRIUS directors their
    fiduciary duties in connection
    
    20
 
    with considering and approving the merger agreement. The SIRIUS
    board of directors discussed with SIRIUS management and Simpson
    Thacher and Wiley Rein the regulatory approvals that would be
    necessary to complete the merger. At that meeting, Morgan
    Stanley rendered its opinion that, as of the date of the meeting
    and based upon and subject to the factors, assumptions, matters,
    procedures, limitations and qualifications set forth in such
    opinion, the exchange ratio pursuant to the merger agreement was
    fair, from a financial point of view, to SIRIUS. At the
    February 18, 2007 SIRIUS board meeting, the SIRIUS board of
    directors unanimously determined, among other things, that the
    merger agreement and the merger contemplated thereby are
    advisable and in the best interest of SIRIUS and its
    stockholders, authorized the issuance of shares in the merger,
    resolved that the amendment to the SIRIUS certificate of
    incorporation to increase the number of authorized shares was
    advisable and in the best interest of SIRIUS and its
    stockholders and resolved to recommend that SIRIUS stockholders
    approve the share issuance and the amendment to SIRIUS
    certificate of incorporation.
 
    The XM board held a lengthy telephonic meeting on February 18
    and held another telephonic meeting on  February 19, 2007.
    At such meetings, the XM board of directors received reports
    from management on the status of the discussions with SIRIUS,
    and received reports from its financial and legal advisors about
    the terms of the merger agreement. Skadden, Arps reviewed with
    the XM directors their fiduciary duties in connection with
    considering and approving the merger agreement. The XM board
    discussed with XM management and outside legal counsel, Jones
    Day and Latham & Watkins, the regulatory approvals
    that would be necessary to complete the merger. At the
    February 18, 2007 XM board of directors meeting, JPMorgan
    rendered its oral opinion that, as of the date of the meeting
    and based upon and subject to the factors, assumptions, matters,
    procedures, limitations and qualifications set forth in such
    opinion, the exchange ratio to be received by the holders of XM
    shares in the merger was fair, from a financial point of view,
    to such holders. JPMorgan subsequently confirmed its oral
    opinion by delivering its written opinion, dated
    February 20, 2007, to the board of directors of XM. At the
    February 19, 2007 XM board of directors meeting, the XM
    board of directors unanimously, with the XM director appointed
    by General Motors and the XM director appointed by American
    Honda each abstaining, determined that the merger agreement and
    the merger contemplated thereby are advisable and in the best
    interest of XM and its stockholders, approved, adopted and
    authorized the merger agreement, and resolved to recommend that
    XM stockholders adopt the merger agreement. The XM directors
    appointed by each of General Motors and American Honda abstained
    from voting with respect to the proposed merger, with the
    consent of the other XM directors, given XMs and
    SIRIUS commercial and other arrangements with various
    automakers, including General Motors and American Honda.
 
    Shortly after the conclusion of the XM board of directors
    meeting on February 19, 2007, SIRIUS, XM and Merger Sub
    executed and delivered to each other the merger agreement.
 
    Reasons
    for the Merger
 
    Both SIRIUS and XM believe that there are substantial potential
    strategic and financial benefits of the proposed merger of
    equals. This section summarizes the principal potential
    strategies and financial benefits that the parties expect to
    realize in the merger. For a discussion of various factors that
    could prohibit or limit the parties from realizing some or all
    of these benefits, see Risk Factors beginning on
    page 15.
 
    Each of XM and SIRIUS believes that the merger will enhance
    stockholder value through, among other things, enabling SIRIUS
    and XM to capitalize on the following strategic advantages and
    opportunities:
 
    |  |  |  | 
    |  |  | Cost Synergies:  SIRIUS and XM believe that the
    merger will create significant cost synergies for SIRIUS and XM.
    Wall Street equity analysts have published estimates of the
    present value of cost synergies ranging from $3 billion to
    $9 billion. SIRIUS and XM expect operating cost savings to
    be achievable in almost every cost item on the companies
    income statement, including sales and marketing, subscriber
    acquisition, research and development, general and
    administrative expenses, product development, content, and
    programming operating infrastructure. Moreover, over the
    long-term, the combined company expects to derive significant
    additional value by procuring its future generation satellites
    and terrestrial repeaters as a single entity. The combination of
    the fixed components of the two companies means that as the
    combined business grows, a greater portion of revenue will be
    realized as cash flow. | 
|  | 
    |  |  | Better Competitive Positioning:  The market for
    audio entertainment in the United States is robustly competitive
    and rapidly evolving. SIRIUS and XM must compete directly and
    intensely with a host of other | 
    
    21
 
    |  |  |  | 
    |  |  | audio providers for consumer attention. The combination will
    better position satellite radio to compete for consumers
    attention and entertainment stability against a host of products
    and services in the highly competitive and rapidly evolving
    audio entertainment marketplace. In addition to existing
    competition from free over-the-air AM and FM radio
    as well as iPods and mobile phone streaming, satellite radio
    faces challenges from the rapid growth of HD Radio, Internet
    radio and next generation wireless technologies. In addition,
    cost reductions resulting from the combination of SIRIUS and XM
    will enable satellite radio to maintain competitive prices for
    subscription and devices. | 
 
    |  |  |  | 
    |  |  | Greater Programming Choice:  SIRIUS and XM
    believe that the merger will permit the combined company to
    offer consumers more choices and value. XM and SIRIUS expect to
    be able to add the best of the others lineup to their
    service, subject to obtaining permission of the applicable
    content provider  as well as offer other new
    programming packages. XM and SIRIUS already broadcast a wide
    range of commercial-free music channels; exclusive and
    non-exclusive sports coverage; news, talk, entertainment, and
    religious programming; channels in Spanish, French and other
    foreign languages; as well as weather and traffic channels for
    many cities. In the long run, the combined company is expected
    to be able to consolidate redundant programming, making it
    possible to use channel capacity to enhance programming
    diversity, including additional programming related to public
    safety and homeland security, and programming aimed at minority
    and underserved communities. The merger also will help
    accelerate deployment of advanced technology, including
    improvements in products such as real-time traffic and rear seat
    video and development of a next-generation satellite system. | 
|  | 
    |  |  | Advancements in Technology:  XM and SIRIUS
    believe that the combined company will be able to offer
    consumers access to advanced technology sooner than would
    otherwise occur. In particular, the combination of the
    companies two engineering organizations is expected to
    lead to better results from each dollar invested in research and
    development. | 
 
    The merger is also expected to foster the commercial
    introduction of interoperable satellite radios. In originally
    implementing rules for the satellite radio service, the FCC
    required SIRIUS and XM to develop designs for a radio capable of
    receiving the signal of either system. In accordance with this
    requirement, SIRIUS and XM created a jointly funded engineering
    team that has developed radios that are interoperable with each
    others networks. After the transaction is consummated, the
    marketplace itself will provide economic incentives to encourage
    further innovation and the subsidization and commercial
    distribution of interoperable radios. With appropriate subsidies
    to lower the costs, radio manufacturers would likely shift some
    amount of production, consistent with customer demand, to
    fabricating radios that tune to all channels of the combined
    service. Eventually, such radios are expected to enable the
    combined company to offer enhanced content and services.
 
    |  |  |  | 
    |  |  | Advertising Revenue Growth:  The combined
    company is expected to be more attractive to large national
    advertisers, since it will have significantly more reach than
    either company on its own. | 
|  | 
    |  |  | Compatible Cultures and Commitment to
    Excellence:  XM and SIRIUS expect that the
    combined company will have a highly experienced management
    assembled from both companies, with extensive industry knowledge
    in radio, media, consumer electronics, engineering and
    technology. | 
|  | 
    |  |  | Enhanced Stockholder Value:  XM and SIRIUS
    believe that the combined company will provide significant,
    realizable cost synergies, strong future cash flows, and a
    broader audience. All these benefits will provide enhanced value
    for stockholders. | 
 
    The actual synergistic benefits from the merger and costs of
    integration could be different from the foregoing estimates and
    these differences could be material. Accordingly, there can be
    no assurance that any of the potential benefits described above
    or included in the factors considered by the SIRIUS board of
    directors described under  SIRIUS Board of
    Directors Recommendation beginning on page 23
    or by the XM board of directors described under  XM
    Board of Directors Recommendation beginning on
    page 24 will be realized. See Risk Factors and
    Cautionary Statement Regarding Forward-Looking
    Statements beginning on pages 15 and 14, respectively.
    
    22
 
 
    SIRIUS
    Board of Directors Recommendations
 
    At a meeting on February 18, 2007, the SIRIUS board of
    directors (i) determined that the merger and entering into
    the merger agreement are advisable and in the best interest of
    SIRIUS and its stockholders, (ii) approved the merger and
    the merger agreement and the transactions contemplated thereby,
    including the Charter Amendment and the Share Issuance, and
    (iii) determined to recommend that the holders of SIRIUS
    common stock vote FOR the Charter Amendment and FOR the Share
    Issuance.
 
    In connection with the foregoing actions, the SIRIUS board of
    directors consulted with SIRIUS management, as well as
    SIRIUS financial advisor and outside legal counsel and
    considered the following factors and risks in addition to the
    specific reasons described above under  Reasons for
    the Merger:
 
    |  |  |  | 
    |  |  | The information concerning SIRIUS and XMs respective
    historic businesses, financial results and prospects, including
    the result of SIRIUS due diligence review of XM. | 
|  | 
    |  |  | SIRIUS assessments that the two companies can effectively
    and efficiently be integrated. | 
|  | 
    |  |  | The opinion of SIRIUS financial advisor, Morgan Stanley
    (which will receive a fee for its services as financial advisor
    to SIRIUS in connection with the merger, which is contingent
    upon the completion of the merger), that, as of
    February 18, 2007 and subject to the matters stated in its
    opinion, the exchange ratio pursuant to the merger agreement was
    fair, from a financial point of view, to SIRIUS. | 
|  | 
    |  |  | The exchange ratio of 4.6 shares of SIRIUS common stock for
    each share of XM common stock and the fact that the exchange
    ratio is fixed and will not fluctuate based upon changes in
    SIRIUS stock price between signing and closing. | 
|  | 
    |  |  | The strong commitment of both parties to complete the merger
    pursuant to their respective obligations under the terms of the
    merger agreement. | 
|  | 
    |  |  | The risk that regulatory agencies may not approve the merger or
    may impose terms and conditions on their approvals that would
    materially and adversely affect the projected financial results
    of the combined company. | 
|  | 
    |  |  | The expectation that XM stockholders, immediately after
    completion of the merger, would hold approximately 50.3% of the
    shares of common stock of the combined company on a fully
    diluted basis, excluding shares issuable on conversion of
    XMs outstanding 1.75% convertible senior notes due 2009. | 
|  | 
    |  |  | The potential impact of the restrictions under the merger
    agreement on SIRIUS ability to take certain actions during
    the period prior to the closing of the merger (which may delay
    or prevent SIRIUS from undertaking business opportunities that
    may arise pending completion of the merger). | 
|  | 
    |  |  | The potential for diversion of management and employee attention
    and for increased employee attrition during the period prior to
    the closing of the merger agreement, and the potential effect of
    these on SIRIUS business and relations with customers,
    suppliers and regulators. | 
|  | 
    |  |  | The risk that an unanticipated technological development or
    damage to a satellite system may materially and adversely affect
    the business benefits anticipated to result from the merger. | 
|  | 
    |  |  | The risk that certain members of SIRIUS senior management
    might choose not to remain employed with SIRIUS prior to the
    completion of the merger or with the combined company. | 
|  | 
    |  |  | The fact that the merger agreement provides that the SIRIUS
    board of directors after the merger will initially consist of
    12 directors, and SIRIUS and XM will each designate four
    directors, who will qualify as independent directors, and XM
    will designate two additional directors (one will be a designee
    of General Motors and the other will be a designee of American
    Honda) with the remaining directors being Mel Karmazin,
    SIRIUS CEO, and Gary M. Parsons, XMs Chairman, who
    will become chairman of the board of directors of the combined
    company. | 
|  | 
    |  |  | The risk that certain of SIRIUS directors and officers may
    have interests in the merger as individuals that are in addition
    to, or that may be different from, the interests of SIRIUS
    stockholders. | 
    
    23
 
 
    |  |  |  | 
    |  |  | The fees and expenses associated with completing the merger. | 
|  | 
    |  |  | The risk that anticipated cost savings will not be achieved. | 
 
    In view of the wide variety of factors considered in connection
    with its evaluation of the merger and the complexity of these
    matters, the SIRIUS board of directors did not find it useful to
    and did not attempt to quantify, rank or otherwise assign
    relative weights to these factors.
 
    In addition, the SIRIUS board of directors did not undertake to
    make any specific determination as to whether any particular
    factor, or any aspect of any particular factor, was favorable or
    unfavorable to its ultimate determination, but rather the SIRIUS
    board of directors conducted an overall analysis of the factors
    described above, including discussions with the management team
    and outside legal and financial advisors. In considering the
    factors described above, individual members of the SIRIUS board
    of directors may have given different weight to different
    factors.
 
    XM Board
    of Directors Recommendation
 
    On February 19, 2007, the XM board of directors
    (i) determined that the approval of the merger agreement
    and the transactions contemplated thereby, including the merger,
    are in the best interests of XM and its stockholders,
    (ii) approved and adopted the merger agreement and the
    transactions contemplated thereby and (iii) resolved to
    recommend the adoption of the merger agreement to the
    stockholders of XM.
 
    In reaching this conclusion, the XM board of directors consulted
    with XMs management, as well as its financial advisor and
    outside legal counsel, and considered the following factors in
    addition to the specific reasons described above under
     Reasons for the Merger beginning on
    page 21:
 
    |  |  |  | 
    |  |  | The information concerning XMs and SIRIUS respective
    historic businesses, financial results and prospects, including
    the results of XMs due diligence review of SIRIUS. | 
|  | 
    |  |  | XMs assessments that the two companies can effectively and
    efficiently be integrated. | 
|  | 
    |  |  | The oral opinion of XMs financial advisor, JPMorgan (which
    will receive a fee for its services as financial advisor to XM
    in connection with the merger, a substantial portion of which is
    contingent upon the completion of the merger), that, as of
    February 18, 2007 and based upon and subject to the factors
    and assumptions set forth in its written opinion, the exchange
    ratio in the merger was fair, from a financial point of view, to
    the holders of XM common stock. Such oral opinion was
    subsequently confirmed by JPMorgan by delivery of its written
    opinion dated February 20, 2007. | 
|  | 
    |  |  | The fact that the implied value of the merger consideration,
    based on the closing price of SIRIUS common stock on
    February 16, 2007 (the last trading day prior to
    announcement of the merger) represented a premium of 21.7% to
    the closing price of XM common stock on such date, and that the
    proposed exchange ratio represented a 31.1% premium to the
    average implied historical exchange ratio for the six month
    period ended February 16, 2007 and a substantial premium
    over other recent historical periods. | 
|  | 
    |  |  | The expectation that XM stockholders, immediately after
    completion of the merger, would hold approximately 50.3% of the
    shares of common stock of the combined company on a fully
    diluted basis, excluding shares issuable on conversion of
    XMs outstanding 1.75% convertible senior notes due 2009,
    and will have the opportunity to share in the future growth and
    expected synergies of the combined company while retaining the
    flexibility of selling all or a portion of those shares. | 
|  | 
    |  |  | The strong commitment on the part of both parties to complete
    the merger pursuant to their respective obligations under the
    terms of the merger agreement. | 
|  | 
    |  |  | The terms of the merger agreement, including the termination
    fee, which, in the view of the XM board of directors, does not
    preclude a proposal for an alternative acquisition transaction
    involving XM. | 
|  | 
    |  |  | The fact that the merger agreement allows the XM board of
    directors to change or withdraw its recommendation of the merger
    agreement if a superior proposal is received from a third party
    or if the XM board of directors determines that the failure to
    change its recommendation would be inconsistent with its
    fiduciary duties under applicable law, subject to the payment of
    a termination fee upon termination under certain circumstances. | 
    
    24
 
 
    |  |  |  | 
    |  |  | The fact that the merger agreement provides that the SIRIUS
    board of directors after the merger will initially consist of
    12 directors, and SIRIUS and XM will each designate four
    directors, who will qualify as independent directors, and XM
    will designate two additional directors (one will be a designee
    of General Motors and the other will be a designee of American
    Honda) with the remaining directors being Mel Karmazin,
    SIRIUS CEO, and Gary M. Parsons, XMs Chairman, who
    will become chairman of the board of directors of the combined
    company. | 
 
    The XM board of directors also identified and considered a
    number of uncertainties, risks and other potentially negative
    factors, including the following:
 
    |  |  |  | 
    |  |  | The risk that regulatory agencies may not approve the merger or
    may impose terms and conditions on their approvals that would
    materially and adversely affect the financial results of the
    combined company. | 
|  | 
    |  |  | The potential impact of the restrictions under the merger
    agreement on XMs ability to take certain actions during
    the period prior to the closing of the merger (which may delay
    or prevent XM from undertaking business opportunities that may
    arise pending completion of the merger). | 
|  | 
    |  |  | The potential for diversion of management and employee attention
    and for increased employee attrition during the period prior to
    the closing of the merger agreement, and the potential effect of
    these on XMs business and relations with customers,
    suppliers and regulators. | 
|  | 
    |  |  | The risk that an unanticipated technological development or
    damage to a satellite system may materially and adversely affect
    the business benefits anticipated to result from the merger. | 
|  | 
    |  |  | The fact that certain provisions of the merger agreement,
    although reciprocal, may have the effect of discouraging
    proposals for alternative acquisition transactions involving XM,
    including: (i) the restriction on XMs ability to
    solicit proposals for alternative transactions; (ii) the
    requirement that the XM board of directors submit the merger
    agreement to the XM stockholders for adoption in certain
    circumstances, even if it withdraws its recommendation for the
    merger; and (iii) the requirement that XM pay a termination
    fee of $175 million to SIRIUS in certain circumstances
    following the termination of the merger agreement. | 
|  | 
    |  |  | The risk that certain of XMs directors and officers may
    have interests in the merger as individuals that are in addition
    to, or that may be different from, the interests of the XM
    stockholders. | 
|  | 
    |  |  | The fees and expenses associated with completing the merger. | 
|  | 
    |  |  | The risk that certain members of XMs senior management
    might choose not to remain employed with XM prior to the
    completion of the merger or with the combined company. | 
|  | 
    |  |  | The risk that anticipated cost savings will not be achieved. | 
|  | 
    |  |  | The risks of the type and nature described above under
    Risk Factors. | 
 
    The XM board recommends that XM common stockholders vote FOR the
    Merger Proposal.
 
    In view of the wide variety of factors considered in connection
    with its evaluation of the merger and the complexity of these
    matters, the XM board of directors did not find it useful to and
    did not attempt to quantify, rank or otherwise assign relative
    weights to these factors.
 
    In addition, the XM board of directors did not undertake to make
    any specific determination as to whether any particular factor,
    or any aspect of any particular factor, was favorable or
    unfavorable to its ultimate determination, but rather the XM
    board of directors conducted an overall analysis of the factors
    described above, including discussions with the management team
    and outside legal, financial and accounting advisors. In
    considering the factors described above, individual members of
    the XM board of directors may have given different weight to
    different factors.
 
    Opinion
    of Financial Advisor to the SIRIUS Board of Directors
 
    SIRIUS retained Morgan Stanley to provide financial advisory
    services and a financial fairness opinion to the board of
    directors of SIRIUS in connection with the merger. The board of
    directors selected Morgan Stanley to act
    
    25
 
    as its financial advisor based on Morgan Stanleys
    qualifications, expertise, reputation and knowledge of the
    business of SIRIUS. At the special meeting of the SIRIUS board
    of directors on February 18, 2007, Morgan Stanley rendered
    its oral opinion, subsequently confirmed in writing as of the
    same date, that based upon and subject to the assumptions,
    qualifications and limitations set forth in the opinion, the
    exchange ratio pursuant to the merger agreement was fair from a
    financial point of view to SIRIUS.
 
    The full text of Morgan Stanleys written opinion, dated
    February 18, 2007, which sets forth, among other things,
    the assumptions made, procedures followed, matters considered
    and qualifications and limitations of the reviews undertaken in
    rendering its opinion, is attached as Annex B to this Proxy
    Statement. The summary of Morgan Stanleys fairness opinion
    set forth in this Proxy Statement is qualified in its entirety
    by reference to the full text of the opinion. Stockholders
    should read this opinion carefully and in its entirety. Morgan
    Stanleys opinion is directed to the board of directors of
    SIRIUS, addresses only the fairness from a financial point of
    view of the exchange ratio pursuant to the merger agreement to
    SIRIUS as of the date of the opinion, and does not address any
    other aspect of the merger. Morgan Stanleys opinion does
    not constitute a recommendation to any stockholder of SIRIUS as
    to how such stockholder should vote with respect to the merger.
    In addition, this opinion does not in any matter address the
    prices at which SIRIUS common stock will trade following the
    consummation of the merger.
 
    In connection with rendering its opinion, Morgan Stanley, among
    other things:
 
    |  |  |  | 
    |  |  | reviewed certain publicly available financial statements and
    other business and financial information of each of XM and
    SIRIUS; | 
|  | 
    |  |  | reviewed certain internal financial statements and other
    financial and operating data concerning each of XM and SIRIUS; | 
|  | 
    |  |  | reviewed certain financial projections prepared by the
    management of each of XM and SIRIUS in connection with the
    proposed transaction; | 
|  | 
    |  |  | reviewed information relating to certain strategic, financial
    and operational benefits anticipated from the merger, prepared
    by the managements of each of XM and SIRIUS; | 
|  | 
    |  |  | discussed the past and current operations and financial
    condition and the prospects of XM, including information
    relating to certain strategic, financial and operational
    benefits anticipated from the merger, with senior executives of
    XM; | 
|  | 
    |  |  | discussed the past and current operations and financial
    condition and the prospects of SIRIUS, including information
    relating to certain strategic, financial and operational
    benefits anticipated from the merger, with senior executives of
    SIRIUS; | 
|  | 
    |  |  | reviewed the pro forma impact of the merger on SIRIUS; | 
|  | 
    |  |  | reviewed the reported prices and trading activity for the XM
    common stock and the SIRIUS common stock; | 
|  | 
    |  |  | reviewed the financial terms, to the extent publicly available,
    of certain comparable merger of equals transactions; | 
|  | 
    |  |  | participated in discussions and negotiations among
    representatives of XM and SIRIUS and their financial and legal
    advisors; | 
|  | 
    |  |  | reviewed the merger agreement and certain related
    documents; and | 
|  | 
    |  |  | performed such other analyses and considered such other factors
    as it deemed appropriate. | 
 
    In arriving at its opinion, Morgan Stanley assumed and relied
    upon, without independent verification, the accuracy and
    completeness of the information supplied or otherwise made
    available to it by XM and SIRIUS for the purposes of its
    opinion. With respect to the financial projections, including
    information relating to certain strategic, financial and
    operational benefits anticipated from the merger, Morgan Stanley
    assumed that they were reasonably prepared on bases reflecting
    the best currently available estimates and judgments of the
    future financial performance of XM and SIRIUS. In addition,
    Morgan Stanley assumed, in all respects material to its
    analysis, that the
    
    26
 
    merger will be consummated in accordance with the terms set
    forth in the merger agreement without any waiver, amendment or
    delay of any terms or conditions, including, among other things,
    that the merger will be treated as a tax-free reorganization
    pursuant to the Internal Revenue Code of 1986, as amended.
    Morgan Stanley assumed that in connection with the receipt of
    all the necessary governmental, regulatory or other approvals
    and consents required for the proposed merger, no delays,
    limitations, conditions or restrictions will be imposed that
    would have a material adverse effect on the contemplated
    benefits expected to be derived in the proposed merger. Morgan
    Stanley relied upon, without independent verification, the
    assessment by the managements of XM and SIRIUS of: (i) the
    strategic, financial and other benefits expected to result from
    the merger; (ii) the timing and risks associated with the
    integration of XM and SIRIUS; (iii) their ability to retain
    key employees of XM and SIRIUS, respectively; and (iv) the
    validity of, and risks associated with, XM and SIRIUS
    existing and future technologies, intellectual property,
    products, services and business models. Morgan Stanley is not a
    legal, tax or regulatory advisor and has relied upon, without
    independent verification, the assessment of SIRIUS and XM and
    their legal, tax and regulatory advisors with respect to such
    matters. Morgan Stanley did not make any independent valuation
    or appraisal of the assets or liabilities of XM, nor was it
    furnished with any such appraisals. Morgan Stanleys
    opinion was necessarily based on financial, economic, market and
    other conditions as in effect on, and the information made
    available to us as of, February 18, 2007. Events occurring
    after February 18, 2007, may affect Morgan Stanleys
    opinion and the assumptions used in preparing it, and Morgan
    Stanley did not assume any obligation to update, revise or
    reaffirm its opinion.
 
    The following is a summary of the material financial analyses
    performed by Morgan Stanley in connection with its oral opinion
    of February 18, 2007 and the preparation of its written
    opinion of the same date. Some of these summaries include
    information in tabular format. In order to understand fully the
    financial analyses used by Morgan Stanley, the tables must be
    read together with the text of each summary. The tables alone do
    not constitute a complete description of the analyses.
 
    XM
    Historical Share Price Analysis
 
    To provide background information and perspective with respect
    to the relative historical share prices of XM, Morgan Stanley
    reviewed the stock price performance and trading volumes of XM
    during various periods ending on February 16, 2007.
 
    Morgan Stanley noted that the range of low and high closing
    prices of XM common stock during the 52-week period ending on
    February 16, 2007 was approximately $10 to $24, during the
    90-day
    period ending on February 16, 2007 was approximately $13 to
    $17 and during the
    30-day
    period ending on February 16, 2007 was approximately $13 to
    $17. Morgan Stanley noted that the merger consideration as of
    February 16, 2007 was valued at $17.02 per share of XM
    common stock. The $17.02 merger consideration was calculated by
    multiplying the fixed transaction exchange ratio of 4.60 by the
    February 16, 2007 closing share price for SIRIUS common
    stock of $3.70 per share.
 
    Morgan Stanley next compared the transaction exchange ratio of
    4.60 and implied merger consideration value of $17.02 per share
    of XM common stock implied by the closing share prices of XM and
    SIRIUS shares of common stock as of February 16, 2007 of
    $13.98 per share and $3.70 per share, respectively, with
    historical exchange ratios and XM share prices for the
    90-day
    period ending on February 16, 2007. The following table
    lists the implied exchange ratio and share price premiums
    represented by the merger consideration during the selected
    periods:
 
    |  |  |  |  |  |  |  |  |  | 
|  |  | Transaction Premium to 
 |  |  | Transaction Premium to 
 |  | 
| 
    Days Trading
 |  | Exchange Ratio (4.60x)(1) |  |  | Share Price ($17.02)(1) |  | 
|  | 
| 
    Feb 16, 2007(1)
    
 |  |  | 22 | % |  |  | 22 | % | 
| 
    5-Day
    
 |  |  | 25 | % |  |  | 28 | % | 
| 
    10-Day
    
 |  |  | 24 | % |  |  | 26 | % | 
| 
    20-Day
    
 |  |  | 22 | % |  |  | 23 | % | 
| 
    30-Day
    
 |  |  | 19 | % |  |  | 16 | % | 
| 
    60-Day
    
 |  |  | 18 | % |  |  | 15 | % | 
| 
    90-Day
    
 |  |  | 26 | % |  |  | 21 | % | 
 
 
    |  |  |  | 
    | (1) |  | Based on XM share price of $13.98 and SIRIUS share price of
    $3.70, each as of February 16, 2007 | 
    
    27
 
 
    SIRIUS
    Share Price Analysis
 
    To provide background information and perspective with respect
    to the relative historical share prices of SIRIUS, Morgan
    Stanley reviewed the stock price performance and trading volumes
    of SIRIUS during various periods ending on February 16,
    2007.
 
    Morgan Stanley noted that the range of low and high closing
    prices of SIRIUS common stock during the 52-week period ending
    on February 16, 2007 was approximately $3.55 and $5.65,
    during the 90-day period ending on February 16, 2007 was
    approximately $3.55 to $4.30 and during the last 30 days
    ending on February 16, 2007 was approximately $3.55 to
    $4.15. Morgan Stanley noted that SIRIUS common stock price
    as of February 16, 2007 was $3.70 per share.
 
    Historical
    Exchange Ratio Analysis
 
    Morgan Stanley analyzed the historical trading price of XM
    relative to SIRIUS common stock based on closing prices between
    February 16, 2005 and February 16, 2007 and calculated
    the historical exchange ratios during certain periods implied by
    dividing the daily closing prices per share of XM common stock
    by those of SIRIUS common stock and the average of those
    historical trading ratios for various periods ended on
    February 16, 2007. Morgan Stanley also calculated the
    exchange ratio implied by the closing price per share of common
    stock of each of XM and SIRIUS on February 16, 2007 of
    $13.98 and $3.70 per share, respectively. This analysis implied
    the following exchange ratios and premiums:
 
    |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | Transaction Premium to 
 |  | 
| 
    Days Trading
 |  | Implied Exchange Ratio(1)(2) |  |  | Share Price(1) |  | 
|  | 
| 
    Feb 16, 2007
    
 |  |  | 3.78 | x |  |  | 22 | % | 
| 
    5-Day
    
 |  |  | 3.67 |  |  |  | 25 | % | 
| 
    10-Day
    
 |  |  | 3.72 |  |  |  | 24 | % | 
| 
    20-Day
    
 |  |  | 3.76 |  |  |  | 22 | % | 
| 
    30-Day
    
 |  |  | 3.88 |  |  |  | 19 | % | 
| 
    60-Day
    
 |  |  | 3.89 |  |  |  | 18 | % | 
| 
    90-Day
    
 |  |  | 3.66 |  |  |  | 26 | % | 
 
 
    |  |  |  | 
    | (1) |  | Based on XM share price of $13.98 and SIRIUS share price of
    $3.70, each as of February 16, 2007. | 
|  | 
    | (2) |  | Based on transaction exchange ratio of 4.60x. | 
 
    Equity
    Research Analyst Price Targets
 
    Morgan Stanley reviewed public market trading price targets for
    XMs common stock prepared and published by equity research
    analysts. These targets reflect each analysts estimate of
    the future public market trading price of XMs common
    stock. The range of equity analyst
    12-month
    price targets for XM was from $14.00 to $25.00 per share of XM
    common stock. Morgan Stanley noted that the merger consideration
    as of February 16, 2007 was $17.02 per share of XM common
    stock.
 
    Morgan Stanley also reviewed public market trading price targets
    for SIRIUS common stock prepared and published by equity
    research analysts. These targets reflect each analysts
    estimate of the future public market trading price of
    SIRIUS common stock. The range of equity analyst
    12-month
    price targets for SIRIUS was from $2.75 to $8.00 per share of
    SIRIUS common stock. Morgan Stanley noted that the price per
    share of SIRIUS as of February 16, 2007 was $3.70.
 
    The public market trading price targets published by securities
    research analysts do not necessarily reflect current market
    trading prices for XM and shares of SIRIUS common stock and
    these estimates are subject to uncertainties, including the
    future financial performance of XM and SIRIUS and future
    financial market conditions.
    
    28
 
    XM
    Discounted Cash Flow Analysis
 
    Morgan Stanley calculated a range of equity values per share for
    XM based on a
    14-year
    discounted cash flow analysis. In preparing certain of its
    analyses, Morgan Stanley relied upon two specific scenarios with
    respect to the projected future financial performance of XM. The
    scenario referred to as Wall Street research consensus
    estimates refers to results of XM derived from a broad
    range of publicly available equity research analysts
    estimates. The scenario referred to as the XM management
    plan reflects certain projections prepared in connection
    with the proposed transaction based on discussions with
    XMs management transaction group from 2007 through 2010
    and extrapolations by Morgan Stanley of those projections for
    the period of 2011 through 2020. The XM management plan has not
    been formally approved by the board of directors of XM and has
    not been prepared with a view toward public disclosure. XM does
    not publicly disclose internal information of the type provided
    to Morgan Stanley in connection with Morgan Stanleys
    analysis of the merger. The XM management plan was prepared in
    connection with the proposed transaction and is based on
    numerous variables and assumptions that are inherently uncertain
    and may be beyond the control of management, including, without
    limitation, factors related to general economic and competitive
    conditions and prevailing interest rates. Accordingly, actual
    results could vary significantly from those set forth in the XM
    management plan. Morgan Stanley noted that each of the
    projections described in this paragraph were based on numerous
    variables and assumptions that are inherently uncertain and may
    be beyond the control of management, including, without
    limitation, factors related to general economic and competitive
    conditions and prevailing interest rates. Accordingly, actual
    results could vary significantly from those set forth in such
    projections. With respect to the Wall Street research consensus
    estimates, Morgan Stanley noted that the public market trading
    price targets published by securities research analysts do not
    necessarily reflect current market trading prices for share of
    XM and SIRIUS common stock and these estimates are subject to
    uncertainties, including the future financial performance of XM
    and SIRIUS and future financial market conditions.
 
    Utilizing such projections, Morgan Stanley calculated XMs
    annual after-tax unlevered free cash flows for fiscal years 2007
    through 2020. Morgan Stanley estimated a range of terminal
    values calculated in 2020 utilizing perpetual growth rates.
    Morgan Stanley applied a range of perpetual growth rates of 1.0%
    to 4.0% to the unlevered free cash flows in the terminal year.
    Morgan Stanley then discounted the unlevered free cash flow
    streams and the estimated terminal value to a present value
    using a range of discount rates of 10.0% to 12.0%. Based on the
    aforementioned projections and assumptions, the discounted cash
    flow analysis of XM yielded an implied valuation range for XM
    common stock of $13.80 to $25.02 per share utilizing Wall Street
    research consensus estimates and $24.74 to $39.27 per share
    utilizing the XM management plan. Morgan Stanley noted that the
    per share merger consideration was $17.02 as of
    February 16, 2007.
 
    SIRIUS
    Discounted Cash Flow Analysis
 
    Morgan Stanley calculated a range of equity values per share for
    SIRIUS based on a
    14-year
    discounted cash flow analysis.
 
    Similar to the XM discounted cash flow analysis discussed above,
    in preparing certain of its analyses, Morgan Stanley
    incorporated two specific scenarios with respect to the
    projected future financial performance of SIRIUS. The scenario
    referred to as Wall Street research consensus
    estimates refers to results of SIRIUS derived from a broad
    range of publicly available Wall Street equity research
    estimates. The scenario referred to as the SIRIUS
    management plan reflects certain projections prepared in
    connection with the proposed transaction based on discussions
    with SIRIUS management transaction group from 2007 through
    2011 and extrapolations by Morgan Stanley of those projections
    for the period from 2012 through 2020. The SIRIUS management
    plan has not been formally approved by SIRIUS senior
    management or by the board of directors of SIRIUS and has not
    been prepared with a view toward public disclosure. SIRIUS does
    not publicly disclose internal information of the type provided
    to Morgan Stanley in connection with Morgan Stanleys
    analysis of the merger. The SIRIUS management plan was prepared
    in connection with the proposed transaction and is based on
    numerous variables and assumptions that are inherently uncertain
    and may be beyond the control of management, including, without
    limitation, factors related to general economic and competitive
    conditions and prevailing interest rates. Accordingly, actual
    results could vary significantly from those set forth in the
    SIRIUS management plan. In analyzing these extrapolated
    projections, Morgan Stanley relied upon observed trends as
    projected by Wall Street research consensus estimates
    
    29
 
    with respect to the projected period beyond 2011. Morgan Stanley
    noted that each of the projections described in this paragraph
    are based on numerous variables and assumptions that are
    inherently uncertain and may be beyond the control of
    management, including, without limitation, factors related to
    general economic and competitive conditions and prevailing
    interest rates. Accordingly, actual results could vary
    significantly from those set forth in such projections.
 
    Utilizing such projections, Morgan Stanley calculated
    SIRIUS annual after-tax unlevered free cash flows for
    fiscal years 2007 through 2020. Morgan Stanley estimated a range
    of terminal values calculated in 2020 utilizing perpetual growth
    rates. Morgan Stanley applied a range of perpetual growth rates
    of 1.0% to 4.0% to the unlevered free cash flows in the terminal
    year. Morgan Stanley then discounted the unlevered free cash
    flow streams and the estimated terminal value to a present value
    using a range of discount rates of 10.0% to 12.0%. Based on the
    aforementioned projections and assumptions, the discounted cash
    flow analysis of SIRIUS yielded an implied valuation range for
    SIRIUS common stock of $3.47 to $5.58 per share utilizing Wall
    Street research consensus estimates and $5.67 to $8.77 per share
    utilizing the SIRIUS management plan. Morgan Stanley noted that
    the price per share of SIRIUS as of February 16, 2007 was
    $3.70.
 
    Contribution
    Analysis
 
    Morgan Stanley also performed a contribution analysis which
    reviewed the pro forma contribution of each of XM and SIRIUS to
    the combined entity and implied contributions based on certain
    operational, financial and valuation metrics based upon each of
    Wall Street research consensus estimates and management plans
    for both XM and SIRIUS whenever applicable. Morgan Stanley
    reviewed the pro forma effect of the merger and computed the
    implied equity contribution of XM and SIRIUS for selected years
    from 2005 to 2010, depending on the relevance of the analyzed
    operational and financial metric within that period. Such
    operational, financial and valuation metrics included
    subscribers, revenue, EBITDA pre-equity compensation expenses,
    discounted cash flow, Wall Street analyst price targets and
    market equity values as of February 16, 2007. Morgan
    Stanley also noted the implied exchange ratio derived from the
    implied equity contributions across the selected metrics.
 
    The computations resulted in the following equity contributions
    and implied exchange ratios:
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Equity Contribution Analysis(1)
 |  | SIRIUS |  |  | XM |  |  | Implied Exchange Ratio |  | 
|  | 
| 
    Based on the SIRIUS and XM
    Management Plans
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscribers
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2005A
    
 |  |  | 36 | % |  |  | 64 | % |  |  | 8.24x |  | 
| 
    2006A
    
 |  |  | 45 | % |  |  | 55 | % |  |  | 5.52 |  | 
| 
    2007E
    
 |  |  | 49 | % |  |  | 51 | % |  |  | 4.71 |  | 
| 
    2008E
    
 |  |  | 52 | % |  |  | 48 | % |  |  | 4.15 |  | 
| 
    Revenue
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2005A
    
 |  |  | 29 | % |  |  | 71 | % |  |  | 11.10 |  | 
| 
    2006A
    
 |  |  | 41 | % |  |  | 59 | % |  |  | 6.53 |  | 
| 
    2007E
    
 |  |  | 48 | % |  |  | 52 | % |  |  | 4.91 |  | 
| 
    2008E
    
 |  |  | 52 | % |  |  | 48 | % |  |  | 4.30 |  | 
| 
    Adjusted EBITDA
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2009E
    
 |  |  | 50 | % |  |  | 50 | % |  |  | 4.57 |  | 
| 
    2010E
    
 |  |  | 49 | % |  |  | 51 | % |  |  | 4.67 |  | 
| 
    DCF Equity Value
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    11% WACC, 3% Perpetual Growth Rate
    
 |  |  | 53 | % |  |  | 47 | % |  |  | 4.11 |  | 
| 
    Based on Research Consensus
    Estimates
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscribers
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2007E
    
 |  |  | 48 | % |  |  | 52 | % |  |  | 4.86x |  | 
| 
    2008E
    
 |  |  | 50 | % |  |  | 50 | % |  |  | 4.62 |  | 
    
    30
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Equity Contribution Analysis(1)
 |  | SIRIUS |  |  | XM |  |  | Implied Exchange Ratio |  | 
|  | 
| 
    Revenue
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2007E
    
 |  |  | 47 | % |  |  | 53 | % |  |  | 5.15 |  | 
| 
    2008E
    
 |  |  | 49 | % |  |  | 51 | % |  |  | 4.66 |  | 
| 
    Adjusted EBITDA
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    2009E
    
 |  |  | 62 | % |  |  | 38 | % |  |  | 2.76 |  | 
| 
    2010E
    
 |  |  | 62 | % |  |  | 38 | % |  |  | 2.74 |  | 
| 
    DCF Equity Value
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    11% WACC, 3% Perpetual Growth Rate
    
 |  |  | 52 | % |  |  | 48 | % |  |  | 4.22 |  | 
| 
    Market Values
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Wall Street Price Targets
    
 |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Low
    
 |  |  | 47 | % |  |  | 53 | % |  |  | 5.09 |  | 
| 
    Average
    
 |  |  | 57 | % |  |  | 43 | % |  |  | 3.66 |  | 
| 
    High
    
 |  |  | 61 | % |  |  | 39 | % |  |  | 3.13 |  | 
| 
    Current Market Value
    
 |  |  | 55 | % |  |  | 45 | % |  |  | 3.78 |  | 
 
 
    |  |  |  | 
    | (1) |  | Based on XM market capitalization of $4.7 billion (share
    price: $13.98, FDSO: 333MM) and net debt of $1,054MM; and SIRIUS
    market capitalization of $5.6 billion (share price: of
    $3.70, FDSO; 1,521MM) and net debt of $623MM as of
    February 16, 2007. | 
 
    Morgan Stanley noted that the 4.60 exchange ratio of XM common
    stock to SIRIUS common stock would result in pro forma ownership
    of the combined company for holders of SIRIUS common stock equal
    to approximately 50%, consistent with a merger of equals.
 
    Morgan Stanley also performed a quarterly historical
    contribution analysis which reviewed the pro forma contribution
    of each of XM and SIRIUS to the combined entity and implied
    contributions based on certain operational and financial
    metrics. Morgan Stanley reviewed the pro forma effect of the
    merger and computed the implied equity contribution of XM and
    SIRIUS on a quarterly basis for the period between the fourth
    quarter of 2004 and the fourth quarter of 2006. Such operational
    and financial results included subscribers, last twelve months
    revenue and run-rate revenue (run-rate revenue is calculated by
    annualizing the amount of revenue generated in each analyzed
    quarter). The computation showed, among other things, that
    SIRIUS implied equity contribution based on ending subscribers
    in each quarter increased from 26% in the fourth quarter of 2004
    to 44% in the fourth quarter of 2006, increased from 21% in the
    fourth quarter of 2004 to 41% in the fourth quarter of 2006
    based on last twelve months revenue, and increased from 23% in
    the fourth quarter of 2004 to 43% in the fourth quarter of 2006
    based on run-rate revenue. The following table details the
    implied equity contributions for the selected metrics on a
    quarterly basis:
 
    SIRIUS
    Implied Asset Value Contribution
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  | 4Q04 |  |  | 1Q05 |  |  | 2Q05 |  |  | 3Q05 |  |  | 4Q05 |  |  | 1Q06 |  |  | 2Q06 |  |  | 3Q06 |  |  | 4Q06 |  | 
|  | 
| 
    Ending Subscribers
    
 |  |  | 26% |  |  |  | 28% |  |  |  | 29% |  |  |  | 30% |  |  |  | 36% |  |  |  | 39% |  |  |  | 40% |  |  |  | 42% |  |  |  | 44% |  | 
| 
    Run-Rate Revenue
    
 |  |  | 23% |  |  |  | 30% |  |  |  | 29% |  |  |  | 30% |  |  |  | 31% |  |  |  | 38% |  |  |  | 40% |  |  |  | 41% |  |  |  | 43% |  | 
| 
    LTM Revenue
    
 |  |  | 21% |  |  |  | 25% |  |  |  | 27% |  |  |  | 29% |  |  |  | 30% |  |  |  | 33% |  |  |  | 36% |  |  |  | 38% |  |  |  | 41% |  | 
 
    Precedent
    Merger of Equals Analysis
 
    Morgan Stanley reviewed the acquisition premium paid for a
    targets common stock one day, 5 days, 10 days,
    20 days, 30 days and 90 days prior to the
    announcement of the applicable transaction in precedent merger
    of equals of
    U.S.-based
    public companies, focusing on deals with a transaction value
    above $5.0 billion since 2004. Morgan Stanley reviewed
    transactions where the consideration paid consisted solely of
    stock. Morgan Stanley also reviewed the composition of the board
    of directors and senior management, and analyzed publicly
    available information, including the respective transaction
    values and pro-forma ownership, for the selected transactions
    reviewed.
    31
 
    The following transactions were reviewed in connection with this
    analysis:
 
    |  |  |  | 
    |  |  | Bank of New York Company, Inc. / Mellon Financial
    Corporation | 
|  | 
    |  |  | CVS Corporation / Caremark Rx, Inc. | 
|  | 
    |  |  | Goldcorp Inc. / Glamis Gold Ltd. | 
|  | 
    |  |  | Thermo Electron Corporation / Fisher Scientific
    International Inc. | 
|  | 
    |  |  | Alcatel / Lucent Technologies, Inc. | 
|  | 
    |  |  | AT&T Inc. / BellSouth Corporation | 
|  | 
    |  |  | Symantec Corporation / Veritas Software Corporation | 
 
    Based on these analyses, Morgan Stanley noted a reference range
    of premiums paid of 0%  30% and a strong correlation
    between the premium paid and an acquirers ability to
    nominate directors of the surviving company and appoint senior
    management.
 
    No company or transaction utilized in the precedent transaction
    analyses is identical to XM, SIRIUS, or the merger. In
    evaluating the precedent transactions, Morgan Stanley made
    judgments and assumptions with regard to general business,
    market and financial conditions and other matters, which are
    beyond the control of XM and SIRIUS, such as the impact of
    competition on the business of XM, SIRIUS or the industry
    generally, industry growth and the absence of any adverse
    material change in the financial condition of XM, SIRIUS or the
    industry or in the financial markets in general, which could
    affect the public trading value of the companies and the
    aggregate value of the transactions to which they are being
    compared.
 
    Pro-Forma
    Discounted Cash Flow Analysis
 
    Morgan Stanley calculated a range of equity values per share for
    the combined company based on a
    14-year
    discounted cash flow analysis of the pro-forma cash flow of the
    combined company, including estimated synergies, using two
    scenarios: (1) the pro-forma case based on Wall Street
    research consensus estimates for both SIRIUS and XM and
    (2) the pro-forma case based on management plans and
    extrapolations of management plans for both companies. In each
    of the Wall Street research consensus estimates and management
    plans, Morgan Stanley included cost synergies as projected by a
    broad range of Wall Street research analysts (revenue or capital
    expenditure synergies were not considered). Utilizing such
    projections, Morgan Stanley calculated the combined
    companys annual after-tax unlevered free cash flows for
    fiscal years 2007 through 2020. Morgan Stanley estimated a range
    of terminal values calculated for 2020 utilizing perpetual
    growth rates. Morgan Stanley applied a range of perpetual growth
    rates of 1.0% to 4.0% to the unlevered free cash flows in the
    terminal year. Morgan Stanley then discounted the unlevered free
    cash flow streams and the estimated terminal value to a present
    value using a range of discount rates of 10.0% to 12.0%.
 
    Based on the aforementioned projections and assumptions, the
    discounted cash flow analysis of the combined company yielded an
    implied valuation range of common stock of $4.41 to $6.95 per
    share and an implied premium to the closing stock price of
    SIRIUS as of February 16, 2007 of 19.1% and 88.0% utilizing
    Wall Street research consensus estimates; and an implied
    valuation range of common stock of $6.60 to $10.06 per share and
    an implied premium to the closing stock price of SIRIUS as of
    February 16, 2007 of 78.5% and 172.0% utilizing the
    management plans.
 
    Morgan Stanley also noted that based on the proposed transaction
    exchange ratio, the closing share prices of SIRIUS and XM as of
    February 16, 2007 and an illustrative value of synergies of
    approximately $6 billion, calculated by reference to the
    equity research consensus estimates, the estimated value
    creation for SIRIUS and XM from the proposed transaction would
    be $2.5 billion and $3.5 billion, respectively.
 
    Morgan Stanley performed a variety of financial and comparable
    analyses for purposes of rendering its opinion. The preparation
    of a financial opinion is a complex process and is not
    susceptible to partial analysis or summary description. In
    arriving at its opinion, Morgan Stanley considered the results
    of all of its analyses as a whole and did not attribute any
    particular weight to any analysis or factor considered.
    Furthermore, Morgan Stanley
    
    32
 
    believes that the summary provided and the analyses described
    above must be considered as a whole and that selecting any
    portion of the analyses, without considering all of them as a
    whole, would create an incomplete view of the process underlying
    Morgan Stanleys analyses and opinion. In addition, Morgan
    Stanley may have given various analyses and factors more or less
    weight than other analyses and factors, and may have deemed
    various assumptions more or less probable than other
    assumptions. As a result, the ranges of valuations resulting
    from any particular analysis or combination of analyses
    described above should not be taken to be the view of Morgan
    Stanley with respect to the actual value of SIRIUS or XM common
    stock or the value of the combined company.
 
    In performing its analyses, Morgan Stanley made numerous
    assumptions with respect to industry performance, general
    business, regulatory, and economic conditions and other matters,
    many of which are beyond the control of Morgan Stanley, SIRIUS
    or XM. Any estimates contained in the analyses of Morgan Stanley
    are not necessarily indicative of future results or actual
    values, which may be significantly more or less favorable than
    those suggested by such estimates.
 
    Morgan Stanley conducted the analyses described above solely as
    part of its analysis of the fairness of the merger consideration
    pursuant to the merger agreement from a financial point of view
    to SIRIUS and in connection with the delivery of its opinion to
    SIRIUS board of directors. These analyses do not purport
    to be appraisals or to reflect the prices at which shares of
    common stock of XM or SIRIUS might actually trade.
 
    The merger consideration was determined through
    arms-length negotiations between SIRIUS and XM and was
    approved by SIRIUS board of directors. Morgan Stanley
    provided advice to SIRIUS during these negotiations. Morgan
    Stanley did not, however, recommend any specific merger
    consideration to SIRIUS or that any specific merger
    consideration constituted the only appropriate consideration for
    the merger.
 
    The opinion of Morgan Stanley was one of the many factors taken
    into consideration by SIRIUS board of directors in making
    its determination to approve the merger agreement. Consequently,
    the analyses as described above should not be viewed as
    determinative of the opinion of SIRIUS board of directors
    with respect to the merger consideration or of whether
    SIRIUS board of directors would have been willing to agree
    to a different merger consideration. The foregoing summary does
    not purport to be a complete description of all of the analyses
    performed by Morgan Stanley.
 
    Morgan Stanley is an internationally recognized investment
    banking and advisory firm. Morgan Stanley, as part of its
    investment banking business, is continuously engaged in the
    valuation of businesses and their securities in connection with
    mergers and acquisitions, negotiated underwritings, competitive
    biddings, secondary distributions of listed and unlisted
    securities, private placements and valuations for corporate,
    estate and other purposes. In the ordinary course of its
    trading, brokerage, investment management and financing
    activities, Morgan Stanley or its affiliates may actively trade
    the debt and equity securities of SIRIUS, XM and their
    affiliates for its own accounts or for the accounts of its
    customers and, accordingly, may at any time hold long or short
    positions in such securities.
 
    Pursuant to an engagement letter, Morgan Stanley provided SIRIUS
    with financial advisory services and a financial opinion in
    connection with the merger. Pursuant to the terms of the
    engagement letter, SIRIUS has agreed to pay Morgan Stanley a
    transaction fee of $10 million for services rendered in
    connection with the merger, which will be paid only if the
    merger is successfully completed. Also, pursuant to the
    engagement letter, Morgan Stanley will be eligible to receive an
    incentive fee of up to $7.5 million, payable at
    SIRIUS sole discretion. In the event that the merger
    agreement is terminated, Morgan Stanley is entitled to receive
    15% of any breakup fee paid to SIRIUS as a result of such
    termination, up to a maximum amount of $10 million. In
    addition, SIRIUS has agreed to indemnify Morgan Stanley and its
    affiliates, their respective directors, officers, agents and
    employees and each person, if any, controlling Morgan Stanley or
    any of its affiliates against certain liabilities and expenses,
    including certain liabilities under the federal securities laws,
    related to or arising out of Morgan Stanleys engagement
    and any related transactions. In the past, Morgan Stanley and
    its affiliates have provided financial advisory and financing
    services for SIRIUS and have received fees for the rendering of
    these services. In particular, an affiliate of Morgan Stanley
    acts as the administrative agent and collateral agent under
    SIRIUS $250 million term loan facility. Morgan
    Stanley may also seek to provide SIRIUS, XM or their
    affiliates services in the future and may receive fees in
    connection with such services.
    
    33
 
 
    Opinion
    of Financial Advisor to the XM Board of Directors
 
    At the meeting of the board of directors of XM on
    February 18, 2007, JPMorgan rendered its oral opinion to
    the board of directors of XM that, as of such date and based
    upon and subject to the factors and assumptions set forth in its
    written opinion, the exchange ratio in the merger was fair from
    a financial point of view to the holders of common stock of XM.
    JPMorgan subsequently confirmed its oral opinion by delivering
    its written opinion, dated February 20, 2007, to the board
    of directors of XM. No limitations were imposed by XMs
    board of directors upon JPMorgan with respect to the
    investigations made or procedures followed by it in rendering
    its opinions.
 
    The full text of the written opinion of JPMorgan, dated
    February 20, 2007, which sets forth, among other things,
    the assumptions made, procedures followed, matters considered
    and limitations on the review undertaken in rendering its
    opinion, is attached as Annex C. The summary of
    JPMorgans opinion set forth in this Proxy Statement is
    qualified in its entirety by reference to the full text of the
    opinion. Stockholders should read this opinion carefully and in
    its entirety. JPMorgans opinion is directed to the board
    of directors of XM, addresses only the fairness from a financial
    point of view of the exchange ratio pursuant to the merger
    agreement to XM as of the date of the opinion, and does not
    address any other aspect of the merger. JPMorgan provided its
    advisory services and opinion for the information and assistance
    of the board of directors of XM in connection with its
    consideration of the proposed merger. The opinion of JPMorgan
    does not constitute a recommendation as to how any stockholder
    should vote with respect to the proposed merger. In addition,
    this opinion does not in any manner address the prices at which
    SIRIUS common stock will trade following the consummation of the
    merger.
 
    In arriving at its opinion, JPMorgan, among other things:
 
    |  |  |  | 
    |  |  | reviewed a draft dated February 18, 2007 of the merger
    agreement; | 
|  | 
    |  |  | reviewed certain publicly available business and financial
    information concerning XM and SIRIUS and the industries in which
    they operate; | 
|  | 
    |  |  | reviewed the current and historical market prices of the common
    stock of XM and the common stock of SIRIUS; | 
|  | 
    |  |  | reviewed certain internal financial analyses and forecasts
    prepared in connection with the proposed transaction by the
    managements of XM and SIRIUS relating to their respective
    businesses, financial forecasts prepared in connection with the
    proposed transaction by XM management (with the assistance
    of an independent consultant) relating to SIRIUS business,
    as well as the estimated amount and timing of the cost savings
    and related expenses and other synergies expected to result from
    the merger, which are referred to in this Proxy Statement as the
    Synergies, and information provided by the managements of each
    of XM and SIRIUS relating to certain of their respective tax
    attributes; and | 
|  | 
    |  |  | performed such other financial studies and analyses and
    considered such other information as JPMorgan deemed appropriate
    for the purposes of this opinion. | 
 
    JPMorgan also held discussions with certain members of the
    management of XM and SIRIUS with respect to certain aspects of
    the merger, and the past and current business operations of XM
    and SIRIUS, the financial condition and future prospects and
    operations of XM and SIRIUS, the effects of the merger on the
    financial condition and future prospects of XM and SIRIUS, and
    certain other matters JPMorgan believed necessary or appropriate
    to its inquiry.
 
    In giving its opinion, JPMorgan relied upon and assumed, without
    assuming responsibility or liability for independent
    verification, the accuracy and completeness of all information
    that was publicly available or was furnished to or discussed
    with JPMorgan by XM and SIRIUS or otherwise reviewed by or for
    JPMorgan. JPMorgan did not conduct and was not provided with any
    valuation or appraisal of any assets or liabilities, nor did
    JPMorgan evaluate the solvency of XM or SIRIUS under any state
    or federal laws relating to bankruptcy, insolvency or similar
    matters. In relying on financial analyses and forecasts provided
    to JPMorgan by the managements of XM and SIRIUS, including the
    Synergies, JPMorgan assumed that they were reasonably prepared
    based on assumptions reflecting the best then available
    estimates and judgments by management of XM and SIRIUS as to the
    expected future results of operations and financial condition of
    XM and SIRIUS to which such analyses or forecasts relate.
    
    34
 
    JPMorgan expressed no view as to such analyses or forecasts
    (including the Synergies) or the assumptions on which they were
    based. JPMorgan also assumed that the merger will qualify as a
    tax-free reorganization for U.S. federal income tax
    purposes, have the tax consequences described in discussions
    with representatives of XM, that the other transactions
    contemplated by the merger agreement will be consummated as
    described in the merger agreement, and that the definitive
    merger agreement would not differ in any material respect from
    the draft thereof provided to JPMorgan. JPMorgan relied as to
    all legal, regulatory or tax matters relevant to the rendering
    of its opinion upon the assessments made by advisors to XM with
    respect to such issues. JPMorgan further assumed that all
    material governmental, regulatory or other consents,
    authorizations and approvals necessary for the consummation of
    the merger will be obtained without any adverse effect on XM and
    SIRIUS or on the contemplated benefits of the merger.
 
    The JPMorgan opinion is necessarily based on economic, market
    and other conditions as in effect on, and the information made
    available to JPMorgan as of, the date of the JPMorgan opinion.
    Subsequent developments may affect the JPMorgan opinion, and
    JPMorgan does not have any obligation to update, revise or
    reaffirm the JPMorgan opinion. The JPMorgan opinion is limited
    to the fairness, from a financial point of view, to the holders
    of common stock of XM of the exchange ratio by which each share
    of XM common stock will be converted into shares of SIRIUS
    common stock should the merger be completed and JPMorgan has
    expressed no opinion as to the fairness of the merger to, or any
    consideration to be received by, the holders of any other class
    of securities, creditors or other constituencies of XM or as to
    the underlying decision by XM to engage in the merger. JPMorgan
    has also expressed no opinion as to the price at which the
    shares of XM or SIRIUS common stock will trade at any future
    time.
 
    In accordance with customary investment banking practice,
    JPMorgan employed generally accepted valuation methods in
    reaching its opinion. The following is a summary of certain of
    the financial analyses undertaken by JPMorgan and delivered to
    the board of directors of XM on February 18, 2007, which
    analyses were among those considered by JPMorgan in connection
    with delivering the JPMorgan opinion.
 
    Projections
 
    In performing its analysis of XM, JPMorgan relied upon
    (1) estimates provided by the management of XM prepared in
    connection with the proposed transaction for the period 2006 to
    2010, plus an extension of such estimates through the period
    ending 2016 prepared by JPMorgan and reviewed and approved by
    the management of XM, which are referred to in this Proxy
    Statement as the XM Management Case and (2) Wall Street
    analyst projections, which are referred to in this Proxy
    Statement as the XM Street Case. In performing its analysis of
    SIRIUS, JPMorgan relied on (1) a base case prepared in
    connection with the proposed transaction by the management of XM
    with the assistance of an independent consultant based on
    estimates provided by the management of SIRIUS for the period
    2006 to 2010, plus an extension of such estimates through the
    period ending 2016 prepared by JPMorgan and reviewed and
    approved by the management of XM, which is referred to in this
    Proxy Statement as the SIRIUS Management Case (2) a
    sensitivity case prepared in connection with the proposed
    transaction by the management of XM with the assistance of an
    independent consultant for the period 2006 to 2010, plus an
    extension of such estimates through the period ending 2016
    prepared by JPMorgan and reviewed and approved by the management
    of XM, which is referred to in this Proxy Statement as the
    SIRIUS Adjusted Management Case, and (3) Wall Street
    analyst projections, which are referred to in this Proxy
    Statement as the SIRIUS Street Case. These estimates were based
    on assumptions regarding the financial performance of XM and
    SIRIUS.
 
    The projections furnished to JPMorgan for XM and SIRIUS were
    prepared by the managements of XM (with the assistance of an
    independent consultant) and SIRIUS in connection with the
    proposed transaction. Neither XM nor SIRIUS publicly discloses
    internal management projections of the type provided to JPMorgan
    in connection with JPMorgans analysis of the merger, and
    such projections were prepared in connection with the proposed
    transaction and were not prepared with a view toward public
    disclosure. These projections were based on numerous variables
    and assumptions that are inherently uncertain and may be beyond
    the control of management, including, without limitation,
    factors related to general economic and competitive conditions
    and prevailing interest rates. Accordingly, actual results could
    vary significantly from those set forth in such projections.
    
    35
 
    Historical
    exchange ratio analysis
 
    JPMorgan reviewed the per share daily closing market price of
    SIRIUS common stock and XM common stock over the previous year,
    and calculated the implied historical exchange ratios during
    this period by dividing the daily closing prices per share of XM
    common stock by those of SIRIUS common stock and the average of
    those implied historical exchange ratios for the
    one-day,
    five-day,
    ten-day,
    one-month, three-month, six-month, one-year and two-year periods
    ending February 16, 2007. The analysis resulted in the
    following average implied exchange ratios for the periods
    indicated (rounded to the nearest hundredth):
 
    |  |  |  |  |  | 
|  |  | Exchange 
 |  | 
|  |  | Ratio |  | 
|  | 
| 
    Current (02/16/2007)
    
 |  |  | 3.78x |  | 
| 
    1-day
    
 |  |  | 3.61x |  | 
| 
    5-day
    
 |  |  | 3.67x |  | 
| 
    10-day
    
 |  |  | 3.72x |  | 
| 
    1-month
    
 |  |  | 3.80x |  | 
| 
    3-month
    
 |  |  | 3.86x |  | 
| 
    6-month
    
 |  |  | 3.51x |  | 
| 
    1-year
    
 |  |  | 3.62x |  | 
|  |  |  |  |  | 
| 
    2-year
    
 |  |  | 4.32x |  | 
|  |  |  |  |  | 
 
    JPMorgan noted that an historical stock trading analysis is not
    a valuation methodology and that such analysis was presented
    merely for informational purposes.
 
    Relative
    Discounted Cash Flow Analysis
 
    JPMorgan conducted a discounted cash flow analysis for each of
    XM and SIRIUS for the purpose of determining their respective
    fully diluted equity value per share on a stand-alone basis
    (i.e., without Synergies).
 
    JPMorgan calculated the unlevered free cash flows that XM and
    SIRIUS are expected to generate during fiscal years 2007 through
    2016 based upon financial projections prepared by the management
    of XM in connection with the proposed transaction. JPMorgan also
    calculated a range of terminal values of both XM and SIRIUS at
    the end of the
    10-year
    period ending 2016 by applying a perpetual revenue growth rate
    ranging from 2.5% to 4.5%. The unlevered free cash flows and the
    range of terminal values were then discounted to present values
    using a range of discount rates from 10.0% to 14.0%, which were
    chosen by JPMorgan based upon an analysis of the weighted
    average cost of capital of XM and SIRIUS. The present value of
    the unlevered free cash flows and the range of terminal asset
    values were then adjusted for XM and SIRIUS estimated 2006
    fiscal year-end net debt to obtain fully diluted equity value.
 
    As part of the total equity value calculated for XM, JPMorgan
    calculated the present value of the tax benefit from XMs
    estimated net operating loss carry-forwards (referred to as
    NOLs) balance as of December 31, 2006. As part of the total
    equity value calculated for SIRIUS, JPMorgan calculated the
    present value of SIRIUS estimated NOLs balance as of
    December 31, 2006.
 
    The analysis yielded the following implied equity value per
    share:
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  | XM |  |  | SIRIUS |  | 
|  |  | Management |  |  | Street |  |  | Management |  |  | Adj. Management |  |  | Street |  | 
|  | 
| 
    High
    
 |  | $ | 43.15 |  |  | $ | 22.19 |  |  | $ | 10.30 |  |  | $ | 8.43 |  |  | $ | 5.78 |  | 
| 
    Mid-point
    
 |  |  | 35.72 |  |  |  | 17.91 |  |  |  | 8.54 |  |  |  | 6.94 |  |  |  | 4.78 |  | 
| 
    Low
    
 |  |  | 30.40 |  |  |  | 14.86 |  |  |  | 7.29 |  |  |  | 5.87 |  |  |  | 4.04 |  | 
 
    JPMorgan compared the results for the XM Management Case to the
    SIRIUS Management Case and to the SIRIUS Adjusted Management
    Case. JPMorgan also compared the results for the XM Street Case
    to the SIRIUS Street Case. For each comparison, JPMorgan
    compared the highest equity value per share for XM to the lowest
    equity value per share for SIRIUS to derive the highest relative
    ownership implied by each pair of estimates.
    
    36
 
    JPMorgan also compared the lowest equity value per share for XM
    to the highest equity value per share for SIRIUS to derive the
    lowest relative ownership implied by each pair of estimates.
    These relative equity ownerships yielded the following implied
    exchange ratios:
 
    |  |  |  |  |  | 
|  |  | Exchange 
 |  | 
|  |  | Ratio |  | 
|  | 
| 
    XM Management Case to SIRIUS
    Management Case
 |  |  |  |  | 
| 
    Lowest XM equity value per share
    to highest SIRIUS equity value per share
    
 |  |  | 3.0x |  | 
| 
    Highest XM equity value per share
    to lowest SIRIUS equity value per share
    
 |  |  | 5.9x |  | 
| 
    XM Management Case to SIRIUS
    Adjusted Management Case
 |  |  |  |  | 
| 
    Lowest XM equity value per share
    to highest SIRIUS equity value per share
    
 |  |  | 3.6x |  | 
| 
    Highest XM equity value per share
    to lowest SIRIUS equity value per share
    
 |  |  | 7.4x |  | 
| 
    XM Street Case to SIRIUS Street
    Case
 |  |  |  |  | 
| 
    Lowest XM equity value per share
    to highest SIRIUS equity value per share
    
 |  |  | 2.6x |  | 
| 
    Highest XM equity value per share
    to lowest SIRIUS equity value per share
    
 |  |  | 5.5x |  | 
 
    Contribution
    Analysis
 
    JPMorgan analyzed the contribution of each of XM and SIRIUS to
    the pro forma combined company with respect to subscribers,
    EBITDA (pre-stock based compensation), operating cash flow, or
    OCF, and levered free cash flow, or LFCF (defined as OCF minus
    capital expenditures), for fiscal years 2006 through 2010 and,
    except for subscribers,
    2007-2010
    cumulative. Out of the four metrics, JPMorgan focused on
    subscriber projections and LFCF. A focus on subscriber
    contributions assumes that per subscriber profitability of XM
    and SIRIUS will converge over time. LFCF is more relevant than
    EBITDA and OCF because EBITDA and OCF do not take into account
    the impact of capital expenditure. Three sets of relative
    contribution analyses were prepared comparing: (i) XM
    Management Case and SIRIUS Management Case; (ii) XM
    Management Case and SIRIUS Adjusted Management Case; and (iii)
    XM Street Case and SIRIUS Street Case. These three sets of
    analyses yielded the following pro forma diluted equity value
    contributions and implied exchange ratios.
 
    For purposes of the contribution analysis, JPMorgan assumed that
    the contributions with respect to subscribers, EBITDA and OCF
    reflected each companys contribution to the combined
    companys pro forma firm value. Equity value contributions
    were derived by adjusting firm value contributions for
    outstanding net debt. JPMorgan assumed that contributions with
    respect to LFCF reflected each companys contribution to
    the combined companys pro forma equity value.
 
    i. XM Management Case and SIRIUS Management Case
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscribers
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  | 
|  | 
| 
    XM contribution
    
 |  |  | 57 | % |  |  | 53 | % |  |  | 49 | % |  |  | 49 | % |  |  | 48 | % | 
| 
    Implied exchange ratio
    
 |  |  | 6.1 | x |  |  | 5.1 | x |  |  | 4.5 | x |  |  | 4.3 | x |  |  | 4.3 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    EBITDA
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 80 | % |  |  | 65 | % |  |  | 57 | % |  |  | 44 | % |  |  | 48 | % |  |  | 50 | % | 
| 
    Implied exchange ratio
    
 |  |  | 18.5 | x |  |  | 8.5 | x |  |  | 6.0 | x |  |  | 3.6 | x |  |  | 4.2 | x |  |  | 4.5 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    OCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 49 | % |  |  | 31 | % |  |  | 46 | % |  |  | 39 | % |  |  | 49 | % |  |  | 45 | % | 
| 
    Implied exchange ratio
    
 |  |  | 4.4 | x |  |  | 2.0 | x |  |  | 4.0 | x |  |  | 2.9 | x |  |  | 4.4 | x |  |  | 3.8 | x | 
 
    
    37
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    LFCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 42 | % |  |  | NM |  |  |  | 82 | % |  |  | 42 | % |  |  | 51 | % |  |  | 47 | % | 
| 
    Implied exchange ratio
    
 |  |  | 3.3 | x |  |  | NM |  |  |  | 20.6 | x |  |  | 3.3 | x |  |  | 4.8 | x |  |  | 4.1 | x | 
 
    ii. XM Management Case and SIRIUS Adjusted Management
    Case
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscribers
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  | 
|  | 
| 
    XM contribution
    
 |  |  | 57 | % |  |  | 53 | % |  |  | 51 | % |  |  | 50 | % |  |  | 50 | % | 
| 
    Implied exchange ratio
    
 |  |  | 6.1 | x |  |  | 5.1 | x |  |  | 4.7 | x |  |  | 4.5 | x |  |  | 4.5 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    EBITDA
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 80 | % |  |  | 74 | % |  |  | NM |  |  |  | 60 | % |  |  | 56 | % |  |  | 72 | % | 
| 
    Implied exchange ratio
    
 |  |  | 18.5 | x |  |  | 13.1 | x |  |  | NM |  |  |  | 6.8 | x |  |  | 5.8 | x |  |  | 11.8 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    OCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 49 | % |  |  | NM |  |  |  | NM |  |  |  | 47 | % |  |  | 56 | % |  |  | 57 | % | 
| 
    Implied exchange ratio
    
 |  |  | 4.4 | x |  |  | NM |  |  |  | NM |  |  |  | 4.1 | x |  |  | 5.8 | x |  |  | 6.0 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    LFCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 42 | % |  |  | 42 | % |  |  | NM |  |  |  | 57 | % |  |  | 61 | % |  |  | 68 | % | 
| 
    Implied exchange ratio
    
 |  |  | 3.3 | x |  |  | 3.3 | x |  |  | NM |  |  |  | 6.1 | x |  |  | 7.1 | x |  |  | 9.7 | x | 
 
    iii. XM Street Case and SIRIUS Street Case
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscribers
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  | 
|  | 
| 
    XM contribution
    
 |  |  | 55 | % |  |  | 51 | % |  |  | 50 | % |  |  | 50 | % |  |  | 49 | % | 
| 
    Implied exchange ratio
    
 |  |  | 5.6 | x |  |  | 4.8 | x |  |  | 4.6 | x |  |  | 4.5 | x |  |  | 4.4 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    EBITDA
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 76 | % |  |  | 73 | % |  |  | NM |  |  |  | 40 | % |  |  | 38 | % |  |  | 49 | % | 
| 
    Implied exchange ratio
    
 |  |  | 14.2 | x |  |  | 12.1 | x |  |  | NM |  |  |  | 3.1 | x |  |  | 2.8 | x |  |  | 4.4 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    OCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 47 | % |  |  | 66 | % |  |  | 45 | % |  |  | 40 | % |  |  | 39 | % |  |  | 40 | % | 
| 
    Implied exchange ratio
    
 |  |  | 4.0 | x |  |  | 9.0 | x |  |  | 3.7 | x |  |  | 3.1 | x |  |  | 2.9 | x |  |  | 3.1 | x | 
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2007-2010 
 |  | 
| 
    LFCF
 |  | 2006 |  |  | 2007 |  |  | 2008 |  |  | 2009 |  |  | 2010 |  |  | Cumul. |  | 
|  | 
| 
    XM contribution
    
 |  |  | 43 | % |  |  | 39 | % |  |  | NM |  |  |  | 37 | % |  |  | 40 | % |  |  | 41 | % | 
| 
    Implied exchange ratio
    
 |  |  | 3.5 | x |  |  | 3.0 | x |  |  | NM |  |  |  | 2.7 | x |  |  | 3.1 | x |  |  | 3.1 | x | 
 
    JPMorgan then compared the exchange ratio in the proposed merger
    to: (1) the exchange ratios implied by the relative equity
    values per share in the discounted cash flow analysis and
    (2) the exchange ratios implied by the contribution
    analysis.
 
    Historical
    premiums analysis
 
    JPMorgan analyzed premiums paid on selected precedent mergers of
    equals (82 transactions since 1995) and selected
    acquisitions of U.S. targets, excluding mergers of equals,
    divided into transactions involving all-stock or mixed
    consideration and transactions involving all-cash consideration
    (a total of 2,848 transactions since 1999).
    38
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Mergers of equals
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    Premium paid
    
 |  |  | <5 | % |  |  | 5-10 | % |  |  | 10-20 | % |  |  | 20-30 | % |  |  | >30 | % | 
| 
    % of transactions
    
 |  |  | 38 | % |  |  | 35 | % |  |  | 20 | % |  |  | 4 | % |  |  | 3 | % | 
 
    The median derived from this analysis is 6.0%.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Acquisitions excluding MoE 100% stock and mixed
    consideration
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    Premium paid
    
 |  |  | <5 | % |  |  | 5-10 | % |  |  | 10-20 | % |  |  | 20-30 | % |  |  | >30 | % | 
| 
    % of transactions
    
 |  |  | 15 | % |  |  | 8 | % |  |  | 17 | % |  |  | 18 | % |  |  | 42 | % | 
 
    The median derived from this analysis is 25.8%.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Acquisitions excluding MoE 100% cash consideration
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    Premium paid
    
 |  |  | <5 | % |  |  | 5-10 | % |  |  | 10-20 | % |  |  | 20-30 | % |  |  | >30 | % | 
| 
    % of transactions
    
 |  |  | 12 | % |  |  | 6 | % |  |  | 15 | % |  |  | 18 | % |  |  | 48 | % | 
 
    The median derived from this analysis is 28.7%.
 
    Based on the February 16, 2007 (the last trading day prior
    to the announcement of the transaction) closing prices of $13.98
    and $3.70 for XM and SIRIUS respectively, the premium implied by
    the proposed 4.60x exchange ratio is 21.7%.
 
    JPMorgan noted that an historical premiums analysis is not a
    valuation methodology and that such analysis was presented
    merely for informational purposes.
 
    XM Per
    Share Accretion Analysis
 
    JPMorgan prepared a multiples-based analysis of the pro forma
    financial impact of the merger. Based on the XM Management Case
    and SIRIUS Management Case projections, and XM and SIRIUS share
    prices and current net debt as of February 16, 2007,
    JPMorgan calculated implied 2010 trading multiples:
 
    |  |  |  |  |  |  |  |  |  | 
| 
    Metric
 |  | XM |  |  | SIRIUS |  | 
|  | 
| 
    Firm value / 2010 EBITDA
    
 |  |  | 6.5 | x |  |  | 7.0 | x | 
| 
    Equity value / 2010 LFCF
    
 |  |  | 4.4 | x |  |  | 5.6 | x | 
 
    JPMorgan calculated the implied pro forma trading multiples
    assuming that immediately after closing, the pro forma company
    traded at a constant price of $3.70 (SIRIUS share price on
    February 16, 2007). JPMorgan also calculated the implied
    pro forma share price assuming that the combined entity will
    trade at a firm value to 2010 EBITDA multiple equal to the
    weighted average of XM and SIRIUS standalone multiples.
    Finally, JPMorgan calculated the implied pro forma share price
    assuming that the combined entity will trade at an equity value
    to 2010 LFCF multiple equal to the weighted average of XM and
    SIRIUS standalone multiples.
 
    Pro forma net debt was adjusted to include the cost to achieve
    synergies and transaction costs, and pro forma EBITDA and LFCF
    projections reflected XM managements assumptions on the
    synergies that will be realized from the merger. The implied XM
    share price accretion/dilution impact was calculated based as
    SIRIUS implied pro forma share price times the 4.60x
    proposed exchange ratio.
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  | Constant 
 |  |  | Constant 2010 
 |  |  | Constant 2010 
 |  | 
| 
    Metric
 |  | Share Price |  |  | FV/EBITDA |  |  | EV/LFCF |  | 
|  | 
| 
    Implied share price
    
 |  | $ | 3.70 |  |  | $ | 4.39 |  |  | $ | 3.97 |  | 
| 
    Implied 2010 FV/EBITDA
    
 |  |  | 5.8 | x |  |  | 6.8 | x |  |  | 6.2 | x | 
| 
    Implied 2010 EV/LFCF
    
 |  |  | 4.7 | x |  |  | 5.6 | x |  |  | 5.1 | x | 
| 
    Accretion to XM
 |  |  | 22 | % |  |  | 44 | % |  |  | 31 | % | 
 
    Value
    Creation Analysis
 
    JPMorgan conducted a value creation analysis that compared the
    share price of XM common stock derived from a discounted cash
    flow valuation on a stand-alone basis to the equity value per
    share pro forma for the merger.
    
    39
 
    The pro forma equity value per share was equal to: (1)
    (a) XMs stand-alone discounted cash flow value
    (including the present value of the expected tax shield from
    NOLs), plus (b) SIRIUS stand-alone discounted cash
    flow value, plus (including the present value of the expected
    tax shield from NOLs), (c) the present value of the
    synergies, less (d) the cost to achieve synergies and
    transaction costs, less (e) an NOL adjustment; divided by
    (2) pro forma diluted shares outstanding. The NOL
    adjustment represented the impact of the transaction on the
    present value of the tax shield from NOLs, taking into account
    limits on the ability to utilize each of XMs and
    SIRIUS NOLs as a result of a change of control under Sec.
    382 of the Code and each of XMs and SIRIUS net
    unrealized built in gains. The value creation analysis was
    repeated using different combinations of projections for the XM
    and SIRIUS discounted cash flow, or DCF, valuations: (1) XM
    Management Case and SIRIUS Management Case, (2) XM
    Management Case and SIRIUS Adjusted Management Case and
    (3) XM Street Case and SIRIUS Street Case.
 
    JPMorgan also prepared a value creation analysis that compared
    the market price of XM common stock as of February 16, 2007
    to the equity value per share pro forma for the merger. The pro
    forma equity value per share was equal to: (1) (a) the
    public market equity value of XM, plus (b) the public
    market equity value of SIRIUS, plus, (c) the value of
    expected synergies calculated by applying a multiple to XM
    managements estimate of run-rate synergies, less
    (d) the cost to achieve synergies and transaction costs
    divided by (2) the pro forma diluted number of shares
    outstanding.
 
    |  |  |  |  |  |  |  | 
| 
    XM valuation
 |  | 
    SIRIUS Valuation
 |  | Accretion |  | 
|  | 
| 
 
DCF valueXM Management Case
 |  | DCF value SIRIUS Management Case
 |  |  | 20 | % | 
| 
 
DCF valueXM Management Case
 |  | DCF value SIRIUS Adj. Mgmt. Case
 |  |  | 10 | % | 
| 
 
DCF valueXM Street Case
 |  | DCF value SIRIUS Street Case
 |  |  | 44 | % | 
| 
    Market value
    
 |  | Market value |  |  | 61 | % | 
 
    The foregoing summary of certain material financial analyses
    does not purport to be a complete description of the analyses or
    data presented by JPMorgan. The preparation of a fairness
    opinion is a complex process and is not necessarily susceptible
    to partial analysis or summary description. JPMorgan believes
    that the foregoing summary and its analyses must be considered
    as a whole and that selecting portions of the foregoing summary
    and these analyses, without considering all of its analyses as a
    whole, could create an incomplete view of the processes
    underlying the analyses and its opinion. In arriving at its
    opinion, JPMorgan did not attribute any particular weight to any
    analyses or factors considered by it and did not form an opinion
    as to whether any individual analysis or factor (positive or
    negative), considered in isolation, supported or failed to
    support its opinion. Rather, JPMorgan considered the totality of
    the factors and analyses performed in determining its opinion.
    Analyses based upon forecasts of future results are inherently
    uncertain, as they are subject to numerous factors or events
    beyond the control of the parties and their advisors.
    Accordingly, forecasts and analyses used or made by JPMorgan are
    not necessarily indicative of actual future results, which may
    be significantly more or less favorable than suggested by those
    analyses. Moreover, JPMorgans analyses are not and do not
    purport to be appraisals or otherwise reflective of the prices
    at which businesses actually could be bought or sold.
 
    As a part of its investment banking business, JPMorgan and its
    affiliates are continually engaged in the valuation of
    businesses and their securities in connection with mergers and
    acquisitions, investments for passive and control purposes,
    negotiated underwritings, secondary distributions of listed and
    unlisted securities, private placements, and valuations for
    estate, corporate and other purposes. JPMorgan was selected on
    the basis of such experience and its familiarity with XM to
    advise XM in connection with the merger and to deliver a
    fairness opinion to the board of directors of XM addressing only
    the fairness from a financial point of view of the exchange
    ratio pursuant to the merger agreement to XM as of the date of
    such opinion.
 
    For services rendered in connection with the merger (including
    the delivery of its opinion), XM has agreed to pay JPMorgan
    $12,500,000, a substantial portion of which is dependent on
    completion of the transaction. In addition, XM has agreed to
    reimburse JPMorgan for its expenses incurred in connection with
    its services, including the fees and disbursements of counsel,
    and will indemnify JPMorgan against certain liabilities,
    including liabilities arising under the federal securities laws.
    
    40
 
    JPMorgan and its affiliates have performed in the past, and may
    continue to perform, certain services for XM, SIRIUS and their
    respective affiliates, all for customary compensation, including
    (1) acting as joint bookrunner in connection with XMs
    private offering of $600 million of unsecured
    9.75% senior notes due 2014 and $200 million of
    unsecured senior floating rate notes due 2013 in May 2006,
    (2) acting as lead bookrunner in connection with XMs
    $250 million senior secured credit facility in April 2006,
    (3) providing treasury and security services to XM on an
    ongoing basis, (4) acting as lead bookrunner in connection
    with SIRIUS prospective offering of $250 million of
    senior notes in March 2005, which was not priced due to market
    conditions, and (5) acting as underwriter of a block trade
    of SIRIUS common stock for Apollo Investment Fund IV, L.P.
    and Apollo Overseas Partners IV, L.P. in September 2005.
    JPMorgans commercial bank affiliate is agent bank and
    lender to XM under its $250 million senior secured
    revolving credit facility. In the ordinary course of their
    businesses, JPMorgan and its affiliates may actively trade the
    debt and equity securities of XM or SIRIUS for their own
    accounts or for the accounts of customers and, accordingly, they
    may at any time hold long or short positions in such securities.
 
    Interests
    of Directors and Executive Officers in the Merger
 
    Interests
    of Directors and Executive Officers of XM in the
    Merger
 
    In considering the recommendations of XMs board of
    directors with respect to its approval of the merger agreement,
    XMs stockholders should be aware that XMs executive
    officers and directors have interests in the merger that are
    different from, or in addition to, those of the XM stockholders
    generally.
 
    Stock
    Options and Restricted Stock
 
    In the merger, all outstanding XM employee stock options and
    restricted stock awards will be converted into options and
    restricted stock awards of SIRIUS, in each case, on terms
    substantially identical to those in effect immediately prior to
    the completion of the merger, and those options and restricted
    stock awards will entitle the holder to receive SIRIUS common
    stock. The number of shares issuable under those options and
    restricted stock awards, and, where applicable, the exercise
    prices for those options and awards, will be adjusted based on
    the exchange ratio. In addition, to the extent that the transfer
    of shares of XM common stock issuable upon exercise of any XM
    option (or issued in connection with any previously exercised XM
    option) is conditioned upon the fair market value of XM common
    stock achieving a specified percentage increase over the
    exercise price of such XM option, such restriction will be
    applied by requiring the same percentage increase in SIRIUS
    common stock over the exercise price of the corresponding
    converted option (or, in the case of a previously exercised XM
    option, the exercise price that would have been determined under
    the calculation above had such XM option been outstanding at the
    completion of the merger). A similar adjustment will occur with
    respect to any transfer restrictions applicable with respect to
    shares subject to, or acquired pursuant to, XM restricted stock
    awards.
 
    In addition, restricted stock awards held by XM executive
    officers will become 100% vested upon an involuntary termination
    or resignation for good reason within one year of a change in
    control, stock options held by XM executive officers will become
    100% vested upon an involuntary termination of employment or
    resignation for good reason within one year of a change in
    control, and stock options will be fully exercisable for up to
    twelve months following such termination. All trading
    restrictions on restricted shares and options will also lapse
    upon a qualifying termination. For these purposes, change
    in control is defined in a manner that includes
    consummation of the merger. The treatment of outstanding stock
    options and restricted stock awards held by the XM Chairman, CEO
    and COO are described below under Employment
    Agreements.
 
    Employment
    Agreements
 
    Chairman.  XM has an employment agreement with
    Gary Parsons, its Chairman, dated August 6, 2004, last
    amended April 4, 2007. Pursuant to his employment
    agreement, in the event of a termination of employment of
    Mr. Parsons without cause, or if Mr. Parsons were to
    resign for good reason (which includes a change in control of
    XM), he will be paid a lump sum equal to two times the sum of
    base salary and target annual bonus for the year of termination
    and XM will continue to make available (or pay annually in a
    lump sum) all applicable benefits for two years. In the event of
    such a termination, Mr. Parsons also will be entitled to
    receive a pro-rated portion of his target annual bonus for the
    year in which such termination occurs. In addition, all options
    and restricted shares granted to
    
    41
 
    Mr. Parsons will vest immediately and options will remain
    exercisable for eighteen months. In addition, contractual
    trading restrictions on all restricted shares and shares
    acquired pursuant to options granted under
    Mr. Parsons employment agreement will lapse after
    termination without cause or resignation for good reason within
    one year following a change in control. For these purposes
    change in control is defined in a manner that
    includes the consummation of the merger. The employment
    agreement also provides for a
    gross-up
    payment to be made to Mr. Parsons in the event of any
    excise tax penalties imposed by Section 4999 of the Code
    (relating to golden parachute payments).
 
    Chief Executive Officer.  XM has an employment
    agreement with Hugh Panero, its CEO, dated August 6, 2004,
    last amended April 4, 2007. Pursuant to the employment
    agreement, a severance amount equal to three times the sum of
    base salary and target bonus for the year of termination will be
    paid to Mr. Panero if XM and Mr. Panero mutually agree
    to terminate his employment prior to March 31, 2008 or if
    Mr. Panero is terminated without cause or resigns for good
    reason (which includes a change in control of XM, and also
    includes the departure of Mr. Parsons as the Chairman of XM
    unless the new chairman is reasonably acceptable to
    Mr. Panero). Under those circumstances XM will also make
    available (or pay annually in a lump sum) all applicable
    benefits for five years from the date of termination. In the
    event of such a termination, Mr. Panero also will be
    entitled to receive a pro-rated portion of his target annual
    bonus for the year in which such termination occurs. In
    addition, all options and restricted stock awards will vest
    immediately if Mr. Panero were to be terminated without
    cause or by mutual agreement or were to resign for good reason
    (other than restricted stock grants made in 2007, which will
    vest on completion of the consulting term described below). All
    options will remain exercisable for eighteen months. All trading
    restrictions on stock acquired pursuant to restricted share
    awards and options under the employment agreement will lapse.
    For these purposes, change in control is defined in
    a manner that includes stockholder approval of a merger. The
    agreement also provides that Mr. Panero will perform
    part-time consulting services if his employment terminates prior
    to the earlier of March 31, 2008 and consummation of the
    merger, with such services to be provided until the earlier of
    the foregoing dates. The agreement also provides for a
    gross-up
    payment to be made to Mr. Panero for any penalties imposed
    by Section 409A of the Code (relating to nonqualified
    deferred compensation), and in the event of any excise tax
    penalties imposed by Section 4999 of the Code (relating to
    golden parachute payments).
 
    XM and Mr. Panero have agreed that his employment will
    terminate in August 2007, and Mr. Panero will receive the
    above-referenced payments and benefits in connection with such
    termination.
 
    President and Chief Operating Officer.  XM has
    an employment agreement with Nathaniel Davis, its President and
    COO, dated July 20, 2006, last amended April 4, 2007.
    The employment agreement provides for a severance amount equal
    to two times the sum of base salary and target bonus for the
    year of termination (or, if following a change in control,
    target bonus for the year of the change in control, if higher),
    as well as two years benefits continuation, to be paid or
    provided if Mr. Davis is terminated without cause or
    resigns for good reason (which includes a change in control of
    XM, and the appointment of a new CEO of XM other than himself or
    Mr. Parsons). Mr. Davis also will be entitled to
    receive a pro-rated portion of his annual bonus for the year,
    based on target for the year of termination (or, if following a
    change in control, target bonus for the year of the change in
    control, if higher). The employment agreement also provides for
    all trading restrictions on stock acquired pursuant to
    restricted share awards and options under the employment
    agreement to lapse after termination without cause or
    resignation for good reason within one year following a change
    in control. For these purposes, change in control is
    defined in a manner that includes consummation of the merger.
    The agreement also provides for a
    gross-up
    payment to be made to the executive in the event of any excise
    tax penalties imposed by Section 4999 of the Code (relating
    to golden parachute payments).
 
    Mr. Davis will serve as the interim CEO effective as of the
    termination of Mr. Paneros employment.
 
    Severance
    Agreements
 
    XM has entered into change in control severance agreements with
    each of the executive officers of XM other than the XM Chairman,
    CEO and COO. The agreements provide, among other things, that if
    a change in control of XM occurs and as a result the officer is
    either involuntarily terminated or terminates his or her
    employment for good reason, the officer will receive a lump sum
    cash payment equal to two times the sum of the officers
    base salary and target annual bonus, a pro-rata target annual
    bonus in respect of the year of termination, continued health
    and
    
    42
 
    insurance benefits for two years, and outplacement services for
    two years. All contractual trading restrictions on stock
    acquired pursuant to restricted share awards and options also
    will lapse. For these purposes, change in control is
    defined in a manner that would include consummation of the
    merger. The change in control agreements also provide for a
    gross-up
    payment to be made to the executive in the event of any excise
    tax penalties imposed by Section 4999 of the Code (relating
    to golden parachute payments).
 
    Indemnification
    and Insurance
 
    XM and each of its directors and executive officers have
    previously entered into indemnification agreements. Under the
    indemnification agreements, each director and executive officer
    is entitled to be indemnified against damages, judgments, fines
    penalties and settlements in connection with threatened or
    actual litigation related to his or her capacity as director or
    executive officer. XMs certificate of incorporation and
    its Bylaws provide that XM shall indemnify its directors and
    officers to the fullest extent not prohibited by the Delaware
    General Corporation Law. In addition, XM has obtained an
    insurance policy covering directors and officers for claims that
    such directors and officers may otherwise be required to pay or
    for which XM is required to indemnify them, subject to certain
    exclusions.
 
    The merger agreement provides that, following the completion of
    the merger, the combined company will indemnify and hold
    harmless, and provide advancement of claims-related expenses to,
    all past and present directors, officers and employees of XM and
    its subsidiaries against all losses, claims, expenses or
    liabilities pertaining to matters occurring prior to the closing
    of the merger. This indemnification will apply to the same
    extent such persons are indemnified or have the right to
    advancement of expenses as of the date of the merger agreement
    by XM pursuant to XMs certificate of incorporation, bylaws
    and indemnification agreements in existence on the date hereof
    with any directors, officers and employees of XM and its
    subsidiaries.
 
    The merger agreement also provides that SIRIUS shall maintain
    XMs current directors and officers liability
    insurance policies for a period of six years.
 
    Designation
    of XMs Chairman as Chairman of the Board of Directors of
    the Combined Company
 
    Under the merger agreement, Gary M. Parsons, XMs Chairman,
    will become chairman of the board of directors of the combined
    company upon completion of the merger.
 
    Designation
    as Directors of the Combined Company
 
    The SIRIUS board of directors after the merger will initially
    consist of 12 directors. Mel Karmazin, SIRIUS CEO and
    a member of the SIRIUS board of directors, will remain CEO of
    the combined company and a member of the board of directors.
    Gary M. Parsons, XMs Chairman, will become chairman of the
    board of directors of the combined company. Of the remaining
    10 directors, SIRIUS and XM will each designate four
    directors (who may be existing directors), who will qualify as
    independent directors, and XM will designate two additional
    directors (one will be a designee of General Motors and the
    other will be a designee of American Honda).
 
    Continued
    Employment with the Combined Company
 
    Certain of XMs current executive officers will be offered
    continued employment with the combined company after the
    effective time of the merger. The exact composition of the
    combined companys executive management following the
    merger has not been finalized as of the date of this Proxy
    Statement.
 
    Interests
    of Directors and Executive Officers of SIRIUS in the
    Merger
 
    In considering the recommendations of SIRIUS board of
    directors with respect to its approval of the merger agreement,
    SIRIUS stockholders should be aware that SIRIUS
    executive officers and directors have interests in the merger
    that are different from, or in addition to, those of the SIRIUS
    stockholders generally.
 
    CEO
    and Board of Directors
 
    The CEO of SIRIUS, who is also a director of SIRIUS, will,
    pursuant to the merger agreement, remain CEO of the combined
    company and will remain on the board of directors of the
    combined company. In addition, four current SIRIUS directors
    will serve on the board of directors of the combined company.
    
    43
 
    Employment
    Agreements
 
    SIRIUS has entered into employment agreements with each of its
    executive officers, which contain provisions regarding payments
    upon a termination of employment.
 
    Chief Executive Officer.  In November 2004,
    SIRIUS entered into a five-year agreement with Mel Karmazin to
    serve as its Chief Executive Officer. Pursuant to SIRIUS
    agreement with Mr. Karmazin, his stock options and shares
    of restricted stock will vest upon his termination of employment
    for good reason, upon his death or disability, and in the event
    of a change in control (defined in a manner that does not
    include the proposed merger with XM). In the event
    Mr. Karmazins employment is terminated by SIRIUS
    without cause, his unvested stock options and shares of
    restricted stock will vest and become exercisable, and he will
    receive his current base salary for the remainder of the term
    and any earned but unpaid annual bonus. In the event that any
    payment we make, or benefit SIRIUS provides, to
    Mr. Karmazin would be deemed to be an excess
    parachute payment under Section 280G of the Code such
    that he would be subject to an excise tax, SIRIUS has agreed to
    pay Mr. Karmazin the amount of such tax and such additional
    amount as may be necessary to place him in the exact same
    financial position that he would have been in if the excise tax
    was not imposed.
 
    President, Entertainment and Sports.  Scott A.
    Greenstein has agreed to serve as SIRIUS President,
    Entertainment and Sports, through July 2009. If
    Mr. Greensteins employment is terminated without
    cause or he terminates his employment for good reason, he is
    entitled to receive a lump sum payment equal to (i) his
    base salary in effect from the termination date through July
    2009 and (ii) any annual bonuses, at a level equal to 60%
    of his base salary, that would have been customarily paid during
    the period from the termination date through July 2009. In the
    event Mr. Greensteins employment is terminated
    without cause or he terminates his employment for good reason,
    SIRIUS is also obligated to continue his medical, dental, and
    life insurance benefits for eighteen months following his
    termination. Medical, dental, and life insurance benefits will
    continue through July 2009 if the time period at termination is
    longer than eighteen months. If, following the occurrence of a
    change in control (defined in a manner that does not include the
    proposed merger with XM), Mr. Greenstein is terminated
    without cause or he terminates his employment for good reason,
    SIRIUS is obligated to pay Mr. Greenstein the lesser of
    (i) four times his base salary and (ii) 80% of the
    multiple of base salary, if any, that SIRIUS Chief
    Executive Officer would be entitled to receive under his or her
    employment agreement if he or she was terminated without cause
    or terminated for good reason following such change in control.
    SIRIUS is also obligated to continue Mr. Greensteins
    medical, dental, and life insurance benefits, or pay him an
    amount sufficient to replace these benefits, until the third
    anniversary of his termination date. In the event that any
    payment SIRIUS makes, or benefit it provides, to
    Mr. Greenstein would be deemed to be an excess
    parachute payment under Section 280G of the Code such
    that he would be subject to an excise tax, SIRIUS has agreed to
    pay Mr. Greenstein the amount of such tax and such
    additional amount as may be necessary to place him in the exact
    same financial position that he would have been in if the excise
    tax was not imposed.
 
    President, Operations and Sales.  SIRIUS has
    entered into an amended and restated employment agreement with
    James E. Meyer, dated June 6, 2007, to continue to serve as
    its President, Operations and Sales, through April 30, 2010
    at his present salary. If Mr. Meyers employment is
    terminated without cause or he terminates his employment for
    good reason, SIRIUS will pay him a lump sum payment equal to
    (i) his annual base salary in effect on the termination
    date plus, (ii) the greater of (x) a bonus equal to
    60% of his annual base salary or (y) the prior years
    bonus actually paid to him (the Designated Amount).
    Pursuant to the employment agreement, Mr. Meyer may elect
    to retire in April 2008, April 2009 or April 2010. In the event
    he elects to retire, SIRIUS has agreed to pay him a lump sum
    payment equal to the Designated Amount.
 
    If, following the consummation of the merger, Mr. Meyer
    elects to retire (which he may do shortly following the merger
    or the next April following the merger), or Mr. Meyer is
    terminated without cause or he terminates his employment for
    good reason during the 12 month period following the
    merger, SIRIUS will pay him a lump sum payment equal to two
    times the Designated Amount.
 
    Upon the expiration of Mr. Meyers employment
    agreement in April 2010 or following his retirement, if earlier,
    SIRIUS has agreed to offer Mr. Meyer a one-year consulting
    agreement. SIRIUS expects to reimburse Mr. Meyer for all of
    his reasonable out-of-pocket expenses associated with the
    performance of his obligations under this consulting agreement,
    but does not expect to pay him any cash compensation.
    Mr. Meyers stock options will continue to vest and
    will be exercisable during the term of this consulting agreement.
    
    44
 
    The employment agreement also provides for a
    gross-up
    payment to be made to Mr. Meyer in the event of any excise
    tax penalties imposed by Section 4999 of the Code (relating
    to golden parachute payments).
 
    General Counsel and Secretary.  Patrick
    Donnelly has agreed to serve as SIRIUS Executive Vice
    President, General Counsel and Secretary, through April 30,
    2010. If Mr. Donnellys employment is terminated
    without cause or he terminates his employment for good reason,
    SIRIUS is obligated to pay Mr. Donnelly his annual salary
    and the annual bonus last paid to him and to continue his
    medical and life insurance benefits for one year. In the event
    that any payment SIRIUS makes, or benefit it provides, to
    Mr. Donnelly would be deemed to be an excess
    parachute payment under Section 280G of the Code such
    that he would be subject to an excise tax, SIRIUS has agreed to
    pay Mr. Donnelly the amount of such tax and such additional
    amount as may be necessary to place him in the exact same
    financial position that he would have been in if the excise tax
    was not imposed.
 
    Chief Financial Officer.  David J. Frear has
    agreed to serve as our Executive Vice President and Chief
    Financial Officer through July 2008. If Mr. Frears
    employment is terminated without cause or he terminates his
    employment for good reason, SIRIUS is obligated to pay
    Mr. Frear his annual salary and the annual bonus last paid
    to him and to continue his medical and life insurance benefits
    for one year. In the event that any payment SIRIUS makes, or
    benefit it provides, to Mr. Frear would be deemed to be an
    excess parachute payment under Section 280G of
    the Code such that he would be subject to an excise tax, SIRIUS
    has agreed to pay Mr. Frear the amount of such tax and such
    additional amount as may be necessary to place him in the exact
    same financial position that he would have been in if the excise
    tax was not imposed.
 
    Accounting
    Treatment
 
    The merger will be accounted for as an acquisition of XM by
    SIRIUS under the purchase method of accounting of
    U.S. generally accepted accounting principles. Under the
    purchase method of accounting, the assets and liabilities of the
    acquired company are, as of completion of the merger, recorded
    at their respective fair values and added to those of the
    reporting public issuer, including an amount for goodwill
    representing the difference between the purchase price and the
    fair value of the identifiable net assets. Financial statements
    of SIRIUS issued after the merger will reflect only the
    operations of XM after the merger and will not be restated
    retroactively to reflect the historical financial position or
    results of operations of XM.
 
    All unaudited pro forma condensed combined financial statements
    contained in this Proxy Statement were prepared using the
    purchase method of accounting. The final allocation of the
    purchase price will be determined after the merger is completed
    and after completion of an analysis to determine the fair value
    of XMs assets and liabilities. Accordingly, the final
    purchase accounting adjustments may be materially different from
    the unaudited pro forma adjustments. Any decrease in the fair
    value of the assets or increase in the fair value of the
    liabilities of XM as compared to the unaudited pro forma
    information included in this Proxy Statement will have the
    effect of increasing the amount of the purchase price allocable
    to goodwill.
 
    Regulatory
    Approvals Required for the Merger
 
    Federal
    Communications Commission
 
    Under the Communications Act of 1934, before the completion of
    the merger, the Federal Communications Commission, or FCC, must
    approve the transfer to SIRIUS of control of XM and those
    subsidiaries of XM that hold FCC licenses and authorizations as
    well as the deemed transfer of FCC licenses and authorizations
    held by SIRIUS and its subsidiary to the combined company. The
    FCC must determine whether SIRIUS is qualified to control these
    licenses and authorizations and whether the transfer is
    consistent with the public interest, convenience and necessity.
    SIRIUS and XM filed on March 20, 2007 a consolidated
    application for authority to transfer control with the FCC. On
    June 8, 2007, the FCC released a public notice seeking
    comment on the consolidated application. Comments and objections
    were filed on or before July 9, 2007 and SIRIUS and XM
    filed a joint reply on July 24, 2007. On June 27,
    2007, the FCC released a notice of proposed rule making seeking
    public comment on whether language prohibiting the transfer of
    control of both satellite radio licenses to a single entity in a
    1997 order is a rule and if so whether the rule should be
    changed to allow the merger. Comments are due August 13,
    2007 and reply comments are due August 27, 2007.
    
    45
 
    United
    States Antitrust Laws
 
    Under the
    Hart-Scott-Rodino
    Act and the rules promulgated under that act by the Federal
    Trade Commission, or FTC, the merger may not be completed until
    notifications have been given and information furnished to the
    FTC and to the Antitrust Division of the Department of Justice
    and the specified waiting period has been terminated or has
    expired. XM and SIRIUS each filed notification and report forms
    under the
    Hart-Scott-Rodino
    Act with the FTC and the Antitrust Division on March 12,
    2007. At any time before or after completion of the merger, the
    FTC or the Antitrust Division could take any action under the
    antitrust laws as it deems necessary or desirable in the public
    interest, including seeking to enjoin completion of the merger
    or seeking divestiture of substantial assets of XM or SIRIUS.
    The merger also is subject to review under state antitrust laws
    and could be the subject of challenges by states or private
    parties under the antitrust laws.
 
    On April 12, 2007, XM and SIRIUS received from the
    Antitrust Division a request for additional information and
    material relating to the merger, generally referred to as a
    Second Request, under the
    Hart-Scott-Rodino
    Act. The effect of the Second Request is to extend the waiting
    period imposed by the
    Hart-Scott-Rodino
    Act until 30 days after XM and SIRIUS have substantially
    complied with the Second Request, unless that period is extended
    voluntarily by the parties or terminated sooner by the
    Department of Justice.
 
    Restrictions
    on Sales of Shares of SIRIUS Common Stock Received in the
    Merger
 
    SIRIUS shares of common stock issued in the merger will not be
    subject to any restrictions on transfer arising under the
    Securities Act of 1933, as amended, except for SIRIUS shares
    issued to any XM stockholder who may be deemed to be an
    affiliate of XM or SIRIUS.
 
    Under Rule 145, former XM stockholders who were affiliates
    of XM at the time of the XM special meeting and who are not
    affiliates of SIRIUS after the completion of the merger may sell
    their SIRIUS shares at any time subject to the volume and sale
    limitations of Rule 144 under the Securities Act. In
    addition, so long as former XM affiliates are not affiliates of
    SIRIUS following the completion of the merger, and a period of
    at least one year has elapsed after the completion of the
    merger, the former XM affiliates may sell their SIRIUS shares
    without regard to the volume and sale limitations of
    Rule 144 under the Securities Act if there is adequate
    current public information available about SIRIUS in accordance
    with Rule 144. After a period of two years has elapsed
    following the completion of the merger, and so long as former XM
    affiliates are not affiliates of SIRIUS and have not been for at
    least three months before any sale, they may freely sell their
    SIRIUS shares. Former XM stockholders who are or become
    affiliates of SIRIUS after completion of the merger will remain
    or be subject to the volume and sale limitations of
    Rule 144 under the Securities Act until they are no longer
    affiliates of SIRIUS. The SEC has recently proposed revisions to
    Rule 145 which, if adopted as proposed, may change the
    applicability of Rule 145 to the merger. The anticipated
    timing for the adoption of any revisions to Rule 145 and
    whether such revisions will be adopted as proposed are unknown
    as of the date of this proxy statement. This Proxy Statement
    does not cover resales of SIRIUS received by any person upon
    completion of the merger, and no person is authorized to make
    any use of this Proxy Statement in connection with any resale.
 
    Appraisal
    Rights
 
    Under Section 262 of the General Corporation Law of the
    State of Delaware, holders of shares of SIRIUS common stock and
    XM common stock do not have appraisal rights in connection with
    the merger. However, the holder of XM Series A convertible
    preferred stock will have the right to seek appraisal of the
    fair value of its shares, under Delaware General Corporation Law.
 
    NASDAQ
    Listing of SIRIUS Common Stock; Delisting and Deregistration of
    XM Common Stock
 
    Before the completion of the merger, SIRIUS has agreed to use
    all reasonable efforts to cause the shares of SIRIUS common
    stock to be issued in the merger and reserved for issuance under
    any equity awards to be approved for listing on the NASDAQ
    Global Select Market. Such approval is a condition to the
    completion of the merger. If the merger is completed, XM common
    stock will cease to be listed on the NASDAQ and its shares will
    be deregistered under the Securities Exchange Act of 1934, as
    amended, or the Exchange Act.
    
    46
 
 
    LITIGATION
    RELATING TO THE MERGER
 
    On March 14 and March 20, 2007, two putative class action
    lawsuits entitled Brockwell v. Sirius Satellite Radio,
    Inc., et al., Index No. 60019/07 and Johnson v.
    Sirius Satellite Radio, Inc., et al., Index
    No. 600899/07, were filed against SIRIUS and its directors
    in the Supreme Court of the State of New York (New York County).
    The Brockwell and Johnson complaints allege that the directors
    breached their fiduciary duties and engaged in self-dealing by
    agreeing to merge SIRIUS with XM at an unfair exchange rate.
    More specifically, the lawsuit alleges that in agreeing to the
    merger with XM, the directors failed to adequately account for
    and consider: (i) the true value of SIRIUS and XM;
    (ii) certain XM litigation and regulatory liabilities; and
    (iii) the impact of concessions that SIRIUS and XM would
    need to make in order to obtain antitrust approval for the
    merger. Plaintiffs seek an order enjoining SIRIUS and the
    directors from consummating the merger with XM and an award of
    attorneys fees.
 
    Shortly after filing the original complaints, Plaintiffs
    counsel in the Brockwell and Johnson actions advised SIRIUS that
    they intend to file an amended
    and/or
    consolidated class action complaint. Accordingly, on
    June 11, 2007, SIRIUS entered into a stipulation requiring
    plaintiffs to move to consolidate their actions within
    30 days, and to file an amended
    and/or
    consolidated complaint within 30 days from the date the
    court enters a consolidation order. So far, the plaintiffs have
    not moved to consolidate or amend their actions.
 
    SIRIUS believes the allegations in the Brockwell and Johnson
    actions are without merit and intends to fully defend against
    the asserted claims. At this time, however, the likely outcome
    of the cases cannot be predicted, nor can a reasonable estimate
    of loss, if any, be made.
    
    47
 
 
    MATERIAL
    U.S. FEDERAL INCOME TAX CONSEQUENCES
 
    The following is a summary of the material U.S. federal
    income tax consequences of the merger applicable to a holder of
    shares of XM common stock. This discussion is based upon the
    Code, Treasury regulations, judicial authorities, published
    positions of the Internal Revenue Service (the IRS)
    and other applicable authorities, all as currently in effect and
    all of which are subject to change or differing interpretations
    (possibly with retroactive effect). This discussion is limited
    to U.S. holders (as defined below) that hold their shares
    of XM common stock as capital assets for U.S. federal
    income tax purposes (generally, assets held for investment).
    This discussion does not address all of the tax consequences
    that may be relevant to a particular XM stockholder or to XM
    stockholders that are subject to special treatment under
    U.S. federal income tax laws, such as:
 
    |  |  |  | 
    |  |  | stockholders that are not U.S. holders; | 
|  | 
    |  |  | financial institutions; | 
|  | 
    |  |  | insurance companies; | 
|  | 
    |  |  | tax-exempt organizations; | 
|  | 
    |  |  | dealers in securities or currencies; | 
|  | 
    |  |  | persons whose functional currency is not the U.S. dollar; | 
|  | 
    |  |  | traders in securities that elect to use a mark to market method
    of accounting; | 
|  | 
    |  |  | persons who own more than 5% of the outstanding stock of XM; | 
|  | 
    |  |  | persons that hold XM common stock as part of a straddle, hedge,
    constructive sale or conversion transaction; and | 
|  | 
    |  |  | U.S. holders who acquired their shares of XM common stock
    through the exercise of an employee stock option or otherwise as
    compensation. | 
 
    If a partnership or other entity taxed as a partnership holds XM
    common stock, the tax treatment of a partner in the partnership
    generally will depend upon the status of the partner and the
    activities of the partnership. Partnerships and partners in such
    a partnership should consult their tax advisers about the tax
    consequences of the merger to them.
 
    This discussion does not address the tax consequences of the
    merger under state, local or foreign tax laws. No assurance can
    be given that the IRS would not assert, or that a court would
    not sustain, a position contrary to any of the tax consequences
    set forth below.
 
    Holders of XM common stock are urged to consult with their
    own tax advisors as to the tax consequences of the merger in
    their particular circumstances, including the applicability and
    effect of the alternative minimum tax and any state, local or
    foreign and other tax laws and of changes in those laws.
 
    For purposes of this section, the term
    U.S. holder means a beneficial owner of XM
    common stock that for U.S. federal income tax purposes is:
 
    |  |  |  | 
    |  |  | a citizen or resident of the United States; | 
|  | 
    |  |  | a corporation, or other entity treated as a corporation for
    U.S. federal income tax purposes, created or organized in
    or under the laws of the United States or any State or the
    District of Columbia; | 
|  | 
    |  |  | an estate that is subject to U.S. federal income tax on its
    income regardless of its source; or | 
|  | 
    |  |  | a trust, the substantial decisions of which are controlled by
    one or more U.S. persons and which is subject to the
    primary supervision of a U.S. court, or a trust that
    validly has elected under applicable Treasury regulations to be
    treated as a U.S. person for U.S. federal income tax
    purposes. | 
    
    48
 
 
    Tax
    Consequences of the Merger Generally
 
    SIRIUS and XM intend the merger to qualify as a reorganization
    within the meaning of Section 368(a) of the Code. It is a
    condition to SIRIUS obligation to complete the merger that
    SIRIUS receive a written opinion of its counsel, Simpson
    Thacher & Bartlett LLP, to the effect that the merger
    will be treated as a reorganization within the meaning of
    Section 368(a) of the Code. It is a condition to XMs
    obligation to complete the merger that XM receive an opinion of
    its counsel, Skadden, Arps, Slate, Meagher & Flom LLP,
    to the effect that the merger will be treated as a
    reorganization within the meaning of Section 368(a) of the
    Code. In rendering these opinions, counsel may require and rely
    upon representations contained in letters and certificates to be
    received from SIRIUS and XM. If the letters or certificates are
    incorrect, the conclusions reached in the tax opinions could be
    jeopardized. In addition, the opinions will be subject to
    certain qualifications and limitations as set forth in the
    opinions.
 
    None of the tax opinions given in connection with the merger
    will be binding on the IRS. Neither SIRIUS nor XM intends to
    request any ruling from the IRS as to the U.S. federal
    income tax consequences of the merger. Consequently, no
    assurance can be given that the IRS will not assert, or that a
    court would not sustain, a position contrary to any of those set
    forth below. In addition, if any of the representations or
    assumptions upon which those opinions are based is inconsistent
    with the actual facts, the U.S. federal income tax
    consequences of the merger could be adversely affected.
 
    Assuming that, in accordance with the opinions referred to
    above, the merger qualifies as a reorganization within the
    meaning of Section 368(a) of the Code, then, except as
    provided below with respect to cash received in lieu of
    fractional shares, a U.S. holder will not recognize any
    gain or loss as a result of the receipt of shares of SIRIUS
    common stock pursuant to the merger.
 
    Cash
    received in lieu of fractional shares
 
    A U.S. holder that receives cash in lieu of a fractional
    share of SIRIUS common stock in the merger will generally be
    treated as having received such fractional share and then as
    having received such cash in redemption of such fractional share
    interest. A U.S. holder generally will recognize gain or
    loss measured by the difference between the amount of cash
    received and the portion of the basis of the shares of XM common
    stock allocable to such fractional interest. Such gain or loss
    generally will constitute capital gain or loss and will be
    long-term capital gain or loss if the U.S. holders
    holding period in the XM common stock exchanged was therefore
    greater than one year as of the date of the exchange.
 
    Tax Basis
    and Holding Period
 
    A U.S. holders aggregate tax basis in the SIRIUS
    common stock received in the merger will equal such
    stockholders aggregate tax basis in the XM common stock
    surrendered in the merger reduced by any amount allocable to a
    fractional share of SIRIUS common stock for which cash is
    received. The holding period for the shares of SIRIUS common
    stock received in the merger generally will include the holding
    period for the shares of XM common stock exchanged therefor.
 
    Reporting
    Requirements
 
    A U.S. holder who receives SIRIUS common stock as a result
    of the merger will be required to retain records pertaining to
    the merger. Each U.S. holder who is required to file a
    U.S. tax return and who is a significant holder
    that receives SIRIUS common stock will be required to file a
    statement with such holders U.S. federal income tax
    return setting forth such holders basis in the XM common
    stock and the fair market value of the SIRIUS common stock
    received in the merger. A significant holder is a
    U.S. holder, who, immediately before the merger, owned at
    least 5% of the outstanding stock of XM.
    
    49
 
 
    THE
    MERGER AGREEMENT
 
    The following discussion summarizes material provisions of
    the merger agreement, a copy of which is attached as
    Annex A to this Proxy Statement and is incorporated by
    reference herein. The rights and obligations of the parties are
    governed by the express terms and conditions of the merger
    agreement and not by this summary. This summary is not complete
    and is qualified in its entirety by reference to the complete
    text of the merger agreement. We urge you to read the merger
    agreement carefully in its entirety, as well as this Proxy
    Statement, before making any decisions regarding the merger.
 
    The representations and warranties described below and
    included in the merger agreement were made by SIRIUS and XM to
    each other as of specific dates. The assertions embodied in
    those representations and warranties were made solely for
    purposes of the merger agreement and may be subject to important
    qualifications and limitations agreed to by SIRIUS and XM in
    connection with negotiating its terms. Moreover, the
    representations and warranties may be subject to a contractual
    standard of materiality that may be different from what may be
    viewed as material to stockholders, or may have been used for
    the purpose of allocating risk between SIRIUS and XM rather than
    establishing matters as facts. The merger agreement is described
    in this Proxy Statement and included as Annex A only to
    provide you with information regarding its terms and conditions,
    and not to provide any other factual information regarding
    SIRIUS, XM or their respective businesses. Accordingly, you
    should not rely on the representations and warranties in the
    merger agreement as characterizations of the actual state of
    facts about SIRIUS or XM, and you should read the information
    provided elsewhere in this Proxy Statement and in the documents
    incorporated by reference into this Proxy Statement for
    information regarding SIRIUS and XM and their respective
    businesses. See Where You Can Find More Information
    beginning on page 91 of this Proxy Statement.
 
    The
    Merger
 
    Subject to the terms and conditions of the merger agreement and
    in accordance with Delaware law, XM will merge with and into
    Merger Sub, a wholly owned Delaware subsidiary of SIRIUS, and
    will survive the merger as a wholly owned subsidiary of SIRIUS.
 
    Closing
    and Effective Time of the Merger
 
    The merger will become effective upon the filing of a
    certificate of merger with the Secretary of State of the State
    of Delaware or at such later time as may be agreed upon by XM
    and SIRIUS and as specified in the certificate of merger. The
    filing of the certificate of merger will occur as soon as
    practicable after the conditions to completion of the merger
    have been satisfied or duly waived.
 
    Directors
    and Executive Management Following the Merger
 
    The SIRIUS board of directors after the merger will initially
    consist of 12 directors. Mel Karmazin, SIRIUS Chief
    Executive Officer, or CEO, and a member of the SIRIUS board of
    directors, will remain CEO of the combined company and a member
    of the board of directors. Gary M. Parsons, XMs Chairman,
    will become Chairman of the board of directors of the combined
    company. Of the remaining 10 directors, SIRIUS and XM will
    each designate four directors, who will qualify as independent
    directors, and XM will designate two additional directors (one
    will be a designee of General Motors and the other will be a
    designee of American Honda).
 
    Consideration
    to be Received in the Merger
 
    XM
    Common Stock
 
    |  |  |  | 
    |  |  | XM Common Stock.  At the completion of the
    merger, each outstanding share of XM common stock (other than
    treasury stock and shares owned by SIRIUS immediately prior to
    the completion of the merger, which will be cancelled and
    extinguished, and shares owned by any wholly-owned subsidiary of
    SIRIUS or XM immediately prior to the completion of the merger,
    which shares will remain outstanding) will be converted into the
    right to receive 4.6 shares of SIRIUS common stock,
    together with any cash paid in respect of fractional shares. | 
    
    50
 
 
    |  |  |  | 
    |  |  | Fractional Shares.  Holders of XM common stock
    will not receive any fractional SIRIUS shares in the merger.
    Instead, the total number of SIRIUS common stock that each
    holder of XM common stock will receive in the merger will be
    rounded down to the nearest whole number and SIRIUS will pay
    cash for any resulting fractional shares that an XM stockholder
    otherwise would be entitled to receive. The amount of cash
    payable for a fractional share of SIRIUS common stock will be
    determined by multiplying the fraction by the average closing
    price for a share of SIRIUS common stock on the last trading day
    immediately prior to the completion of the merger. | 
 
    Warrants
    to Purchase Shares of XM Common Stock
 
    XM will take all actions necessary to ensure that at the
    completion of the merger, each warrant to purchase shares of XM
    common stock shall be converted into a warrant to purchase
    shares of SIRIUS common stock on terms substantially identical
    to those in effect immediately prior to the merger under the
    terms of the warrant or other related agreement or award
    pursuant to which such warrant was granted in a manner similar
    to that of options to purchase XM common stock.
 
    XM
    Series A Convertible Preferred Stock
 
    Each outstanding share of XM Series A convertible preferred
    stock will be converted into 4.6 shares of a newly
    designated series of SIRIUS preferred stock in the merger. The
    new series of SIRIUS preferred stock, which will be designated
    as Series A convertible preferred stock, will have the same
    powers, designations, preferences, rights and qualifications,
    limitations and restrictions as the XM Series A convertible
    preferred stock to the fullest extent practicable, except that
    such preferred stock will have the right to vote with the
    holders of the SIRIUS common stock as a single class, with each
    share of preferred stock having 1/5th of a vote.
 
    Adjustments
    to Prevent Dilution
 
    The stock exchange ratio will be appropriately adjusted to
    reflect fully the effect of any stock split, reverse stock
    split, stock dividend (including any dividend or distribution of
    securities convertible into SIRIUS common stock or XM common
    stock), reorganization, recapitalization, reclassification or
    other like change with respect to SIRIUS common stock or XM
    common stock having a record date on or after the date of the
    merger and prior to the completion of the merger.
 
    Procedures
    for Exchange of Certificates
 
    SIRIUS will appoint an exchange agent for the purpose of
    exchanging certificates representing XM common stock. Promptly
    after the completion of the merger, XM, or the exchange agent,
    will mail transmittal materials to each holder of record of XM
    shares of common stock, advising such holders of the
    effectiveness of the merger and the procedure for surrendering
    their share certificates to the exchange agent.
 
    Each holder of a share of XM capital stock that has been
    converted into a right to receive the applicable merger
    consideration (as well as cash for fractional shares, dividends
    or other distributions payable) will receive the applicable
    merger consideration upon surrender to the exchange agent of the
    XM capital stock certificate, together with a letter of
    transmittal covering such shares and any other documents as the
    exchange agent may reasonably require.
 
    After completion of the merger, each certificate that previously
    represented shares of XM capital stock will represent only the
    right to receive the applicable merger consideration as
    described above under  Consideration to be Received
    in the Merger, including cash for any fractional shares of
    SIRIUS common stock as well as any dividends or other
    distributions declared with respect to SIRIUS common stock
    between the date of the merger agreement and the completion of
    the merger.
 
    Holders of XM capital stock should not send in their XM stock
    certificates until they receive and complete and submit a signed
    letter of transmittal sent by the exchange agent with
    instructions for the surrender of XM stock certificates.
    
    51
 
    XM and SIRIUS are not liable to holders of shares of XM capital
    stock for any amount delivered to a public official under
    applicable abandoned property, escheat or similar laws.
 
    After completion of the merger, XM will not register any
    transfers of the shares of XM capital stock. SIRIUS stockholders
    need not exchange their stock certificates.
 
    Representations
    and Warranties
 
    The merger agreement contains customary and similar
    representations and warranties made by SIRIUS and XM to each
    other. These representations and warranties relate to, among
    other things:
 
    |  |  |  | 
    |  |  | organization, capital structure, corporate power and authority,
    execution and delivery, required consents, approvals, orders and
    authorizations of governmental entities relating to, the merger
    agreement and related matters; | 
|  | 
    |  |  | documents filed with the SEC and the accuracy of information
    contained in those documents; | 
|  | 
    |  |  | financial statements and the absence of undisclosed liabilities,
    compliance with applicable laws and reporting requirements; | 
|  | 
    |  |  | certain material contracts; | 
|  | 
    |  |  | legal proceedings, filing of tax returns, payment of taxes and
    other tax matters; | 
|  | 
    |  |  | benefit plans and the Employee Retirement Income Security Act of
    1974; | 
|  | 
    |  |  | absence of material adverse effect since December 31, 2005; | 
|  | 
    |  |  | board approval of the merger; | 
|  | 
    |  |  | vote required to approve the merger; | 
|  | 
    |  |  | properties and assets; | 
|  | 
    |  |  | subsidiaries; | 
|  | 
    |  |  | intellectual property; | 
|  | 
    |  |  | environmental matters; | 
|  | 
    |  |  | labor and employment matters; | 
|  | 
    |  |  | insurance matters; | 
|  | 
    |  |  | brokers used in connection with the merger; and | 
|  | 
    |  |  | receipt of fairness opinions from financial advisors. | 
 
    In addition to the foregoing, the merger agreement contains a
    representation and warranty made by XM regarding the amendment
    of XMs stockholders rights plan to allow for the merger
    and the other transactions contemplated by the merger agreement.
 
    Conduct
    of Business Pending the Merger
 
    Under the merger agreement, each of XM, SIRIUS and each of their
    respective subsidiaries will carry on their respective
    businesses in the usual, regular and ordinary course consistent
    with past practice and use all reasonable efforts to preserve
    intact their respective present business organization, maintain
    their respective rights, franchises, licenses and other
    authorizations issued by governmental entities and preserve
    their relationships with employees, customers, suppliers and
    others having business dealings with them.
    
    52
 
    In addition, each of XM and SIRIUS and each of their respective
    subsidiaries may not, among other things and subject to certain
    exceptions, without the consent of the other party:
 
    |  |  |  | 
    |  |  | enter into (including via any acquisition) any new line of
    business which represents a material change in its operations
    and which is material to it; | 
|  | 
    |  |  | make any material change to its business; | 
|  | 
    |  |  | enter into, terminate or fail to renew any material agreement,
    or make any change to any existing material agreements other
    than in the ordinary course of business or consistent with past
    practice; | 
|  | 
    |  |  | make any capital expenditures, other than capital expenditures
    which, in the aggregate, do not exceed the aggregate amount for
    capital expenditures specified in its respective long-term plans
    for 2007 and 2008; | 
|  | 
    |  |  | declare or pay any dividends on or make other distributions in
    respect of its capital stock; | 
|  | 
    |  |  | split, combine or reclassify any of its capital stock; | 
|  | 
    |  |  | repurchase, redeem or otherwise acquire, or permit any
    subsidiary to redeem, purchase or otherwise acquire, any shares
    of its capital stock or any securities convertible into or
    exercisable for any shares of its capital stock; | 
|  | 
    |  |  | sell any shares of its capital stock, any voting debt, any stock
    appreciation rights, or any securities convertible into or
    exercisable or exchangeable for, or any rights, warrants or
    options to acquire, any such shares or voting debt, or enter
    into any agreement with respect to any of the foregoing, other
    than the issuance of common stock required to be issued upon the
    exercise or settlement of stock awards outstanding on the date
    of the merger agreement in accordance with the terms of the
    applicable stock award; | 
|  | 
    |  |  | amend its charter or bylaws; | 
|  | 
    |  |  | enter into a plan of consolidation, merger or reorganization
    with any person; | 
|  | 
    |  |  | acquire any business or assets, rights or properties, other than
    acquisitions, business combinations that (a) would not
    reasonably be expected to delay the merger and (b) for
    which the total consideration therefor does not exceed a
    specified amount; | 
|  | 
    |  |  | dispose of any of its assets, rights or properties (including
    capital stock of its subsidiaries) which are material to it; | 
|  | 
    |  |  | incur long term indebtedness for borrowed money; | 
|  | 
    |  |  | intentionally take any action that would (a) result in
    (i) any of its representations and warranties being or
    becoming untrue, (ii) any of the conditions to the merger
    not being satisfied, or (iii) a violation of any provision
    of the merger agreement, or which would materially adversely
    affect the ability of the parties to obtain certain regulatory
    approvals per the merger agreement or (b) reasonably be
    expected to prevent or impede the merger from qualifying as a
    tax-free reorganization; | 
|  | 
    |  |  | except as disclosed in certain SEC filings, change its methods
    of accounting in effect at December 31, 2005, or change its
    annual tax accounting period or make any tax election having a
    material adverse effect; | 
|  | 
    |  |  | other than in the ordinary course of business consistent with
    past practice, enter into, amend or terminate any employee
    benefit plan; | 
|  | 
    |  |  | increase the compensation or fringe benefits of any director,
    officer, employee, independent contractor or consultant or pay
    any benefit not required by any employee benefit plan; | 
|  | 
    |  |  | enter into or renew any arrangement providing for the payment of
    compensation or benefits contingent, or the terms of which are
    materially altered, upon the occurrence of the merger; | 
|  | 
    |  |  | provide that the vesting of any granted stock option, restricted
    stock, restricted stock unit or other equity-related award shall
    accelerate or otherwise be affected by the occurrence of the
    merger; | 
    
    53
 
 
    |  |  |  | 
    |  |  | adopt a plan of liquidation or authorize a liquidation,
    dissolution, restructuring, recapitalization or reorganization; | 
|  | 
    |  |  | settle or compromise any litigation in excess of specified
    amount; | 
|  | 
    |  |  | enter into any long-term commitment that would limit, in any
    material respect, its ability to conduct its business in any
    geographic area; or | 
|  | 
    |  |  | agree to or make any commitment to take or authorize any of the
    foregoing actions. | 
 
    Each party has also agreed to confer with one another and advise
    one another regarding material changes to their respective
    businesses or material deficiencies in their respective internal
    controls. Each party will be provided the opportunity to review
    information relating to the other party to be used in filings to
    be made in connection with the merger and shall consult with the
    other regarding consents and approvals necessary for the merger.
 
    Prior to the completion of the merger, each of XM and SIRIUS
    shall exercise, consistent with the terms and conditions of the
    merger agreement, complete control and supervision over its and
    its subsidiaries respective operations.
 
    Best
    Efforts; Other Agreements
 
    Best Efforts.  SIRIUS and XM have each agreed
    to use their reasonable best efforts to take all actions proper
    or advisable under the merger agreement and applicable laws,
    rules and regulations to complete the merger agreement, as well
    as other specified actions, as soon as practicable. However, the
    foregoing does not require SIRIUS or XM to (i) agree to or
    effect any divestiture or take any other action if doing so
    would, individually or in the aggregate, reasonably be expected
    to have a material adverse effect on the combined company after
    the merger, or (ii) take any such action that is not
    conditioned on the consummation of the merger.
 
    Proxy Statement; Stockholders Meetings.  SIRIUS
    and XM have agreed to cooperate in preparing and filing with the
    SEC this Proxy Statement and the registration statement of which
    it forms a part. Each has agreed to use its reasonable best
    efforts to have this Proxy Statement cleared and the
    registration statement of which it forms a part declared
    effective, to maintain the same effective as long as is
    necessary to consummate the merger and the other transactions
    contemplated hereby, and to mail this Proxy Statement to their
    respective stockholders as promptly as practicable after it is
    declared effective.
 
    Affiliates.  XM shall use all reasonable
    efforts to cause each person who is an affiliate
    (for purposes of Rule 145 under the Securities Act) to
    deliver to SIRIUS, as soon as reasonably practicable and in any
    event prior to the XM special meeting, a written agreement, in
    form and substance reasonably satisfactory to SIRIUS, relating
    to required transfer restrictions on the SIRIUS common stock
    received by them in the merger pursuant to Rule 145 under
    the Securities Act.
 
    NASDAQ Listing.  SIRIUS shall use all
    reasonable efforts to cause (i) the shares of SIRIUS common
    stock to be issued in the merger and (ii) the shares of
    SIRIUS common stock reserved for issuance upon the exercise,
    vesting or payment under any equity award to purchase XM common
    stock which becomes an equity award to purchase SIRIUS common
    stock (or any award based on XM common stock which becomes an
    award based on SIRIUS common stock), to be approved for listing
    on NASDAQ, subject to official notice of issuance, prior to the
    closing date.
 
    Conditions
    to Completion of the Merger
 
    Each partys obligation to effect the merger is subject to
    the satisfaction or waiver of various conditions, which include
    the following:
 
    |  |  |  | 
    |  |  | receipt of the approval of the holders of capital stock of XM
    and SIRIUS required for the completion of the merger; | 
|  | 
    |  |  | shares of SIRIUS common stock to be issued in the merger or
    reserved for issuance shall have been authorized for listing on
    the NASDAQ Global Select Market; | 
    
    54
 
 
    |  |  |  | 
    |  |  | certain authorizations, consents, orders or approvals of, or
    declarations or filings with, and the expirations of waiting
    periods required from, certain governmental entities are filed,
    have occurred or been obtained, and are in full force and effect; | 
|  | 
    |  |  | the registration statement of which this Proxy Statement forms a
    part is not the subject of any stop order or proceedings seeking
    a stop order; | 
|  | 
    |  |  | no temporary restraining order, preliminary or permanent
    injunction or other order issued by any court of competent
    jurisdiction or other legal restraint or prohibition preventing
    the consummation of the merger exists; | 
|  | 
    |  |  | no governmental entity of competent jurisdiction makes the
    consummation of the merger illegal; | 
|  | 
    |  |  | there is (i) no action taken, or any statute, rule,
    regulation, order or decree enacted deemed applicable to the
    merger or the transactions contemplated by the merger agreement
    by any governmental entity of competent jurisdiction, or
    (ii) any circumstance arising, or transaction, agreement,
    arrangement or instrument entered into, or which would be
    necessary to be entered into, in connection with the merger or
    the transactions contemplated by the merger agreement, which, in
    either case, imposes any term, condition, obligation or
    restriction upon SIRIUS, XM (after the merger) or their
    respective subsidiaries which, individually or the aggregate,
    would reasonably be expected to have a material adverse effect
    on the present or prospective consolidated financial condition,
    business or operating results of SIRIUS after the completion of
    the merger (in no event shall a change in the trading prices of
    the partys capital stock, by itself, be considered
    material or constitute a material adverse effect); | 
|  | 
    |  |  | the representations and warranties of the other being true and
    correct in all material respects on the date of the merger
    agreement and on the date on which the merger is to be completed
    as if made as of that date or, if these representations and
    warranties expressly relate to an earlier date, then as of that
    specified date; | 
|  | 
    |  |  | the other party to the merger agreement having performed in all
    material respects all obligations, and complied in all material
    respects with the agreements and covenants required to be
    performed by or complied with by it under the merger agreement; | 
|  | 
    |  |  | with respect to SIRIUS obligation to effect the merger,
    the receipt from Simpson Thacher & Bartlett LLP of an
    opinion to the effect that the merger will be treated for
    U.S. federal income tax purposes as a reorganization within
    the meaning of Section 368(a) of the Code; and | 
|  | 
    |  |  | with respect to XMs obligation to effect the merger, the
    receipt from Skadden, Arps, Slate, Meagher & Flom LLP
    of an opinion to the effect that the merger will be treated for
    U.S. federal income tax purposes as a reorganization within
    the meaning of Section 368(a) of the Code. | 
 
    The merger agreement provides that any or all of the additional
    conditions described above may be waived, in whole or in part,
    by SIRIUS or XM, to the extent legally allowed. Neither SIRIUS
    nor XM currently expects to waive any material condition to the
    completion of the merger. If either SIRIUS or XM determines to
    waive any condition to the merger that would result in a
    material adverse change in the terms of the merger to XM or
    SIRIUS stockholders (including any change in the tax
    consequences of the transaction to XM stockholders), proxies
    will be resolicited from the SIRIUS or XM stockholders.
 
    The following shall not be deemed material or to
    have a material adverse effect, including any change
    or event caused by or resulting from:
 
    |  |  |  | 
    |  |  | changes in prevailing economic or market conditions in the
    United States or any other jurisdiction in which such entity has
    substantial business operations (except to the extent those
    changes have a materially disproportionate effect on such entity
    and its subsidiaries relative to the other party and its
    subsidiaries); | 
|  | 
    |  |  | changes or events, after the date of the merger agreement,
    affecting the industries in which the entities operate generally
    (except to the extent those changes or events have a materially
    disproportionate effect on such entity and its subsidiaries
    relative to the other party and its subsidiaries); | 
    
    55
 
 
    |  |  |  | 
    |  |  | changes, after the date of the merger agreement, in generally
    accepted accounting principles or requirements applicable to
    such entity and its subsidiaries (except to the extent those
    changes have a materially disproportionate effect on such entity
    and its subsidiaries relative to the other party and its
    subsidiaries); | 
|  | 
    |  |  | changes, after the date of the merger agreement, in laws, rules
    or regulations of general applicability or interpretations
    thereof by any governmental entity (except to the extent those
    changes have a materially disproportionate effect on such entity
    and its subsidiaries relative to the other party and its
    subsidiaries); | 
|  | 
    |  |  | the execution, delivery and performance of the merger agreement
    or the consummation of the transactions contemplated by the
    merger agreement or the announcement of such acts; or | 
|  | 
    |  |  | any outbreak of major hostilities in which the United States is
    involved or any act of terrorism within the United States or
    directed against its facilities or citizens wherever located. | 
 
    No
    Solicitation
 
    In the merger agreement, each of XM and SIRIUS has agreed that
    it will not directly or indirectly:
 
    |  |  |  | 
    |  |  | solicit, initiate, encourage or knowingly facilitate any
    acquisition proposal, as described below; | 
|  | 
    |  |  | participate in any discussions or negotiations regarding, or
    furnish to any person any confidential information in connection
    with, or knowingly facilitate any effort or attempt to make or
    implement, an acquisition proposal; or | 
|  | 
    |  |  | approve or recommend, or propose to approve or recommend, or
    execute or enter into, any letter of intent, agreement in
    principle, merger agreement, asset purchase or share exchange
    agreement, option agreement or other similar agreement related
    to any acquisition proposal or propose or agree to do any of the
    foregoing. | 
 
    However, if, at any time before the date that the vote required
    to be obtained from its stockholders in connection with the
    merger has been obtained, XMs or SIRIUS board of
    directors may, in good faith:
 
    |  |  |  | 
    |  |  | to the extent applicable, and being otherwise in compliance with
    certain provisions of the merger agreement, comply with Rule
    14d-9 and
    Rule 14e-2
    promulgated under the Exchange Act relating to communication in
    connection with solicitations under the Exchange Act with regard
    to an acquisition proposal, or make any disclosure that the
    board of directors may determine (after consultation with its
    outside legal counsel) is required to be made under applicable
    law; | 
|  | 
    |  |  | if such partys stockholder meeting has yet to occur,
    change its recommendation regarding the merger if (i) there
    has been a development, event or occurrence as a result of which
    the board, after consultation with its outside legal counsel and
    financial advisors, determines in good faith that failure to
    effect a recommendation change would be inconsistent with its
    fiduciary duties under applicable law, (ii) the board
    follows certain notice provisions, and (iii) the board has
    engaged in reasonable, good faith negotiations with the other
    party to the merger agreement, and has considered in good faith,
    after consulting with its financial and legal advisors, any
    modifications to the terms and conditions of this agreement
    proposed by the other party; and | 
|  | 
    |  |  | if such partys stockholder meeting has yet to occur,
    engage in any discussions or negotiations with, or provide any
    confidential information or data to, any person in response to
    an unsolicited bona fide written acquisition proposal by any
    such person, if the board, after consultation with outside legal
    counsel and financial advisors, concludes in good faith that
    there is a reasonable likelihood that such acquisition proposal
    constitutes or is reasonably likely to result in a
    superior proposal, as described below, and prior to
    providing any information or data to any person in connection
    with an acquisition proposal by any such person, its board
    receives from such person a mutually acceptable confidentiality
    agreement on terms no less favorable than those in the
    confidentiality agreement between SIRIUS and XM. | 
 
    The term acquisition proposal means any proposal or
    offer with respect to, or a transaction to effect, a merger,
    reorganization, share exchange, consolidation, business
    combination, recapitalization, liquidation, dissolution or
    similar transaction involving XM, SIRIUS or any of their
    respective significant subsidiaries or any purchase or sale of
    15% or more of the consolidated assets of it and its
    subsidiaries, taken as a whole, or any
    
    56
 
    purchase or sale of, or tender or exchange offer for, its voting
    securities that, if completed, would result in any person
    beneficially owning securities representing 15% or more of its
    total voting power.
 
    The term superior proposal means a bona fide written
    acquisition proposal which the board of directors of SIRIUS or
    XM, as the case may be, concludes in good faith, after
    consultation with its financial advisors and legal advisors,
    taking into account the legal, financial, regulatory, timing and
    other aspects of the proposal and the person making the proposal
    (including any
    break-up
    fees, expense reimbursement provisions and conditions to
    consummation): (i) is more favorable to the stockholders of
    SIRIUS or XM, as the case may be, from a financial point of
    view, than the transactions contemplated by the merger agreement
    (after giving effect to any adjustments to the terms and
    provisions of the merger agreement committed to in writing by
    SIRIUS or XM, as the case may be, in response to such
    acquisition proposal) and (ii) is fully financed or
    reasonably capable of being fully financed, reasonably likely to
    receive all required governmental approvals on a timely basis
    and otherwise reasonably capable of being completed on the terms
    proposed. However, for purposes of this definition of
    superior proposal, the term acquisition
    proposal has the meaning given above, except that the
    reference to 15% or more in the definition of
    acquisition proposal shall be deemed to be a
    reference to a majority and acquisition
    proposal shall only be deemed to refer to a transaction
    involving SIRIUS or XM, as the case may be.
 
    The merger agreement also provides that XM and SIRIUS shall
    notify the other party to the merger agreement of any
    acquisition proposal received by, any information related to an
    acquisition proposal requested from, or any discussions with or
    negotiations by, it or any of its representatives. XM and SIRIUS
    will promptly keep the other party informed of the status and
    terms of any such acquisition proposal, the status and nature of
    all information requested and delivered, and the status and
    terms of any such discussions or negotiations.
 
    Termination
 
    Generally, the merger agreement may be terminated and the merger
    may be abandoned at any time prior to the completion of the
    merger:
 
    |  |  |  | 
    |  |  | by mutual written consent of SIRIUS, Merger Sub and XM; or | 
|  | 
    |  |  | by either party, if: | 
 
    |  |  |  | 
    |  |  | a governmental entity that must grant a requisite regulatory
    approval has denied approval of the merger and the denial has
    become final and non-appealable, or any governmental entity
    issues an order, decree or ruling or taken any other action
    permanently restraining, enjoining or otherwise prohibiting the
    merger, and such order, decree, ruling or other action has
    become final and non-appealable; provided,
    however, this termination right is not available to any
    party whose failure to comply with the merger agreement has been
    the cause of, or resulted in, such action; | 
|  | 
    |  |  | the merger is not consummated on or before March 1, 2008;
    except that right is not available to any party whose failure to
    comply with the merger agreement has been the cause of, or
    resulted in, such failure; | 
|  | 
    |  |  | the other party breached any of the agreements or
    representations in the merger agreement, in a way that the
    related condition to closing would not be satisfied, and this
    breach is either incurable or not cured within 45 days; | 
|  | 
    |  |  | the required SIRIUS or XM stockholder vote has not been obtained
    at the respective stockholders meeting or any adjournment or
    postponement thereof; or | 
|  | 
    |  |  | the board of directors of the other party changes its
    recommendation that its stockholders vote in favor of the merger
    or has breached its obligation relating to a third party
    acquisition proposal or breached its obligations to call its
    stockholders meeting or mail this Proxy Statement to its
    stockholders. The term acquisition proposal has the
    meaning described above in  No Solicitation,
    except that the applicable threshold is a majority instead of
    15% or more of the consolidated assets. | 
    
    57
 
 
    Effect of
    Termination
 
    If the merger agreement is terminated as described in
     Termination above, the agreement will be
    void, and there will be no liability or obligation of any party
    except that:
 
    |  |  |  | 
    |  |  | each party will remain liable for its willful and material
    breach of the merger agreement; and | 
|  | 
    |  |  | designated provisions of the merger agreement, including the
    confidential treatment of information and the allocation of fees
    and expenses, including, if applicable, the termination fees
    described below, will survive termination. | 
 
    Termination
    Fees and Expenses
 
    Either party will be paid a $175 million termination fee by
    the other party if (i) the board of directors of the other
    party has, pursuant to the merger agreement, made an adverse
    recommendation and such party has timely elected to terminate
    the merger agreement; (ii) it is entitled but fails to terminate
    the merger agreement in connection with such change in
    recommendation and the other party materially breaches its
    obligations under the merger agreement by failing to call its
    stockholder meeting or prepare and mail this Proxy Statement; or
    (iii) the other party has effected a change in recommendation
    other than in accordance with the provisions of the merger
    agreement or approved, recommended or entered into an agreement
    with respect to an acquisition proposal other than in accordance
    with the provisions of the merger agreement.
 
    In addition, if (i) either party terminates the merger
    agreement because the stockholder vote required to approve the
    merger has not been obtained upon a vote taken at the other
    partys stockholders meeting and (ii) before the other
    partys stockholders meeting an acquisition
    proposal is communicated to the senior management or board
    of directors of the other party, then this party shall pay
    one-third of $175 million; and if (iii) within twelve
    months of the date of the merger termination, the other party or
    any of its subsidiaries executes or consummates any acquisition
    proposal, then it shall pay the remaining two-thirds of
    $175 million; or
 
    Furthermore, if (i) either party terminates the merger
    agreement because the merger is not consummated on or before
    March 1, 2008 or a party terminates the merger agreement
    because the other party breached any of the covenants or
    agreements or any of the representations or warranties in the
    merger agreement, (ii) before such termination there is a
    public proposal with respect to the other party, and
    (iii) following the occurrence of the public proposal, the
    other party breached intentionally or recklessly (and not cured
    after notice) any of its representations, warranties, covenants
    or agreements set forth in the merger agreement, which shall
    have materially contributed to the failure of the closing to
    occur prior to the termination of the merger agreement, then the
    breaching party shall pay one-third of the $175 million
    termination fee; and if (iv) within twelve months of the
    date of the merger termination, the breaching party or any of
    its subsidiaries executes or consummates any acquisition
    proposal, then the breaching party shall pay the remaining
    two-thirds of the $175 million termination fee.
 
    The term acquisition proposal shall have the meaning
    assigned to such term in  No Solicitation
    above, except that the reference to 15% or more in
    the definition of acquisition proposal is a
    reference to a majority. If the breaching party
    fails to pay all amounts due to the other party on the dates
    specified, then the breaching party shall pay all costs and
    expenses (including legal fees and expenses) incurred by the
    other party in connection with any action or proceeding
    (including the filing of any lawsuit) taken by it to collect
    such unpaid amounts, together with interest on such unpaid
    amounts at the prime lending rate prevailing at such time, as
    published in the Wall Street Journal, from the date such amounts
    were required to be paid until the date actually received by the
    other party. In the above clause, the term public
    proposal refers to an acquisition proposal which is
    publicly announced or which is communicated to the breaching
    party senior management or board of directors between the date
    of the merger agreement and the breaching party stockholders
    meeting to approve the merger.
 
    Expenses
 
    Whether or not the merger is completed, all costs and expenses
    incurred in connection with the merger agreement and the
    transactions contemplated by the merger agreement will be paid
    by the party incurring those costs or expenses, except that if
    the merger is consummated, SIRIUS will pay property or transfer
    taxes imposed on
    
    58
 
    the parties in connection with the merger, and SIRIUS and XM
    will share equally the expenses incurred in connection with
    printing and mailing of this Proxy Statement.
 
    Treatment
    of XM Options and Other Stock-based Awards
 
    The merger agreement provides that prior to the completion of
    the merger, XM and its subsidiaries will take any actions
    necessary to provide that options or awards to purchase shares
    of XM common stock which are outstanding immediately prior to
    completion of the merger shall be converted into and become,
    respectively, options to purchase shares of SIRIUS common stock
    or stock awards based on shares of SIRIUS common stock, in each
    case, on terms substantially identical to those in effect
    immediately prior to the completion of the merger, but adjusting
    the number of shares, exercise price and other terms to reflect
    the exchange ratio as appropriate.
 
    Governance
    Matters
 
    By the completion of the merger, the SIRIUS board of directors
    will take such actions as are necessary to:
 
    |  |  |  | 
    |  |  | amend its by-laws to cause the number of directors that will
    comprise its board of directors at the completion of the merger
    to be 12 persons. Immediately following the completion of
    the merger, the board of directors of the combined company will
    consist of: (i) four members selected by SIRIUS, each of
    whom shall qualify as an independent director
    pursuant to the NASDAQ Marketplace Rules in effect from time to
    time at all times that SIRIUS common stock is listed on NASDAQ;
    (ii) four members selected by XM, each of whom shall
    qualify as an independent director at times that SIRIUS common
    stock is listed on NASDAQ; (iii) two designated
    directors selected by XM, one of whom shall be a designee
    of General Motors and the other of whom shall be a designee of
    American Honda; (iv) the CEO of the combined company; and
    (v) the chairman of the board of directors of the combined
    company. The designated directors do not qualify as
    independent directors. Prior to the completion of the merger,
    SIRIUS board of directors shall approve, by at least a
    two-thirds vote of the directors in office at such time, the
    above composition of SIRIUS board of directors. | 
|  | 
    |  |  | appoint Mel Karmazin as CEO of the combined company and Gary M.
    Parsons as chairman of the board of directors of the combined
    company, effective as of the completion of the merger. In such
    role, Mr. Parsons will be an officer and employee of the
    combined company. In the event that either Mr. Karmazin or
    Mr. Parsons is or will be unable to serve in his designated
    position, either as notified in writing to the parties by such
    individual prior to the completion of the merger or as a result
    of such individuals death or disability, then the
    successor to Mr. Karmazin or Mr. Parsons will be
    determined by joint agreement of the parties, each of whom will
    cooperate in good faith with the other party and use its
    reasonable best efforts to identify prior to the completion of
    the merger the appropriate successor. In the event that the
    parties have been unable to identify a successor within
    30 days after the occurrence of the event giving rise to
    the need to select such successor, the parties will follow
    certain procedures to elect a successor. | 
|  | 
    |  |  | establish three standing committees: a Nominating and Corporate
    Governance Committee, an Audit Committee and a Compensation
    Committee. Members of these three committees will be independent
    directors. The Chairman of the Nominating and Corporate
    Governance Committee will be selected by directors designated by
    SIRIUS. The Chairman of the Audit Committee and the Chairman of
    the Compensation Committee will be selected by directors
    designated by SIRIUS and XM, with each designating one such
    chairman. The composition of the members of the Nominating and
    Corporate Governance Committee, Audit Committee and Compensation
    Committee, including the respective chairman of each such
    committee, will be designated in equal shares by directors
    designated by SIRIUS and directors designated by XM. | 
|  | 
    |  |  | amend the SIRIUS by-laws to provide that, for a period of two
    years following the completion of the merger, (i) any
    termination or replacement of either the Chief Executive Officer
    or Chairman of the board of directors as of the completion of
    the merger (or such individuals successor) or
    (ii) any sale, transfer or other disposition of assets,
    rights or properties which are material, individually or in the
    aggregate, to SIRIUS (or the execution of any agreement to take
    any such action), will require the prior approval of a majority
    of the independent directors. | 
    
    59
 
 
    Employee
    Matters
 
    The merger agreement provides that, following completion of the
    merger (with certain exceptions), the XM and SIRIUS employee
    benefit plans will remain in effect with respect to employees
    covered by such plans at the completion of the merger, and the
    parties shall negotiate in good faith to formulate employee
    benefit plans that provide benefits for services on a similar
    basis to employees who were covered by the XM and SIRIUS
    employee benefit plans immediately prior to the completion of
    the merger.
 
    Indemnification
    and Insurance
 
    The merger agreement provides that, following the completion of
    the merger, SIRIUS will indemnify and hold harmless, and provide
    advancement of claims-related expenses to, all past and present
    directors, officers and employees of XM and its subsidiaries to
    the same extent such persons are indemnified or have the right
    to advancement of expenses as of the date of the merger
    agreement by XM pursuant to XMs certificate of
    incorporation, bylaws and indemnification agreements in
    existence on the date hereof with any directors, officers and
    employees of XM and its subsidiaries.
 
    The merger agreement also provides that SIRIUS will cause to be
    maintained, for a period of six years after the completion of
    the merger, the current policies of directors and
    officers liability insurance maintained by XM, or policies
    with a substantially comparable insurer of at least the same
    coverage and amounts containing terms and conditions that are no
    less advantageous, with respect to claims arising from facts or
    events that occurred before the date of the completion of the
    merger. SIRIUS will not be required to expend in any one year an
    amount more than 300% of the annual premiums paid by XM as of
    the date of the merger agreement for directors and
    officers liability insurance, and if the annual premiums
    of that insurance coverage exceed this amount, SIRIUS will be
    obligated to obtain a policy which, in SIRIUS good faith
    determination, provides the maximum coverage available at an
    annual premium equal to 300% of XMs current premium.
 
    Amendment;
    Extension and Waiver
 
    Subject to applicable law:
 
    |  |  |  | 
    |  |  | the merger agreement may be amended by the parties in writing at
    any time. However, after any approval of the transactions by the
    stockholders of SIRIUS and XM, there may not be any amendment
    which by law requires further approval by SIRIUS stockholders or
    XM stockholders unless SIRIUS and XM obtain again stockholder
    approval; and | 
|  | 
    |  |  | at any time before the completion of the merger, a party may
    extend the time for performance of any of the obligations or
    other acts of the other party to the merger agreement, waive any
    inaccuracies in the representations and warranties of the other
    party or waive compliance by the other party with any agreement
    or condition in the merger agreement. | 
 
    Governing
    Law
 
    The merger agreement is governed by and will be construed in
    accordance with the laws of the State of Delaware.
    
    60
 
 
    INFORMATION
    ABOUT THE COMPANIES
 
    SIRIUS
 
    SIRIUS is a satellite radio provider in the United States. It
    offers over 130 channels to its subscribers  69
    channels of 100% commercial-free music and 65 channels of
    sports, news, talk, entertainment, traffic, weather and data
    content. The core of the SIRIUS enterprise is programming;
    SIRIUS is committed to creating the best programming in all of
    radio.
 
    SIRIUS broadcasts through its proprietary satellite radio
    system, which currently consists of three orbiting satellites,
    127 terrestrial repeaters that receive and retransmit
    SIRIUS signal, a satellite uplink facility and its
    studios. Subscribers receive their service through SIRIUS
    radios, which are sold by automakers, consumer electronics
    retailers, mobile audio dealers and through SIRIUS
    website. Subscribers can also receive SIRIUS music
    channels and certain other channels over the Internet. As of
    March 31, 2007, SIRIUS had 6,581,045 subscribers.
 
    For the year ended December 31, 2006, SIRIUS had revenues
    of approximately $637 million and a net loss of
    approximately $1.1 billion.
 
    SIRIUS was incorporated in the State of Delaware as Satellite CD
    Radio Inc. on May 17, 1990. SIRIUS principal offices
    are located at 1221 Avenue of the Americas, 36th Floor, New
    York, New York 10020 and its telephone number is
    (212) 584-5100.
    For more information on SIRIUS, see Where You Can Find
    More Information on page 91.
 
    XM
 
    XM is a satellite radio provider in the United States. It offers
    over 170 channels to its subscribers  69 channels of
    100% commercial-free music and over 100 channels of news, talk,
    information, entertainment and sports programming. XM believes
    that it appeals to consumers because of its innovative and
    diverse programming, nationwide coverage, many commercial-free
    music channels and digital sound quality.
 
    XM broadcasts through its proprietary satellite radio system,
    which currently consists of two orbiting satellites, two
    in-orbit spare satellites, terrestrial repeaters that receive
    and retransmit XMs signal, satellite uplink facilities and
    its studios. Subscribers receive their service through XM
    radios, which are sold by automakers, consumer electronics
    retailers, mobile audio dealers and through XMs website.
    Subscribers can also receive XM music channels and certain other
    channels over the Internet. XM currently has over 8 million
    subscribers.
 
    For the year ended December 31, 2006, XM had revenues of
    approximately $933 million and a net loss of approximately
    $719 million.
 
    XM is a holding company and was incorporated in the State of
    Delaware as AMRC Holdings, Inc. on May 16, 1997. XMs
    principal offices are located at 1500 Eckington Place, NE,
    Washington, DC 20002, and XMs telephone number at that
    location is
    (202) 380-4000.
    For more information on XM, see Where You Can Find More
    Information on page 91.
 
    Vernon
    Merger Corporation
 
    Vernon Merger Corporation, or Merger Sub, a wholly-owned
    subsidiary of SIRIUS, is a Delaware corporation formed on
    February 15, 2007 for the purpose of effecting the merger.
    In the merger, Merger Sub will merge with XM and XM will become
    a wholly-owned subsidiary of SIRIUS. Merger Sub has not
    conducted any activities other than those incidental to its
    formation and the matters contemplated by the merger agreement,
    including the preparation of applicable regulatory filings in
    connection with the merger.
 
    Joint
    Development Agreement
 
    Under the terms of a joint development agreement between XM and
    SIRIUS, each party is obligated to fund one half of the
    development cost for a unified standard for satellite radios. XM
    and SIRIUS are currently unable to determine the expenditures
    necessary to complete this process, but do not expect that these
    expenditures will be material.
    
    61
 
 
    SIRIUS
    SPECIAL MEETING
 
    Date,
    Time and Place
 
    These proxy materials are delivered in connection with the
    solicitation by the SIRIUS board of directors of proxies to be
    voted at the SIRIUS special meeting, which is to be held
    at          
    at   a.m., local time,
    on          ,
    2007. On or
    about          ,
    2007, SIRIUS commenced mailing this Proxy Statement and the
    enclosed form of proxy to its stockholders entitled to vote at
    the meeting.
 
    Purpose
    of the SIRIUS Special Meeting
 
    SIRIUS stockholders will be asked to vote on the following
    proposals:
 
    |  |  |  | 
    |  |  | to amend SIRIUS certificate of incorporation to increase
    the number of authorized shares of SIRIUS common stock in
    connection with the merger, which we refer to as the Charter
    Amendment (Item 1 on the Proxy Card); | 
|  | 
    |  |  | to approve the issuance of SIRIUS common stock, par value $0.001
    per share, and SIRIUS Series A convertible preferred stock,
    par value $0.001 per share, a new series of SIRIUS preferred
    stock, in the merger, which we refer to as the Share Issuance
    (Item 2 on the Proxy Card); | 
|  | 
    |  |  | approve any motion to adjourn or postpone the SIRIUS special
    meeting to another time or place, if necessary, to solicit
    additional proxies (Item 3 on the Proxy Card); and | 
|  | 
    |  |  | to conduct other business that properly comes before the SIRIUS
    special meeting or any adjournment or postponement thereof. | 
 
    The first two proposals listed above relating to the merger
    are conditioned upon each other and approval of each such
    proposal is required for completion of the merger. The
    Charter Amendment and the Share Issuance become effective only
    if both proposals related to the merger are approved by the
    SIRIUS stockholders and the merger is completed.
 
    SIRIUS
    Record Date; Stock Entitled to Vote
 
    The close of business
    on          ,
    2007, which we refer to as the SIRIUS record date, has been
    fixed as the record date for the determination of stockholders
    entitled to notice of, and to vote at, the SIRIUS special
    meeting or any adjournments or postponements of the SIRIUS
    special meeting.
 
    As of the SIRIUS record date the following shares were
    outstanding and entitled to vote:
 
    |  |  |  |  |  |  |  |  |  | 
|  |  | Shares 
 |  |  | Votes 
 |  | 
| 
    Designation
 |  | Outstanding |  |  | Per Share |  | 
|  | 
| 
    SIRIUS common stock
    
 |  |  |  |  |  |  | 1 |  | 
 
    A complete list of stockholders entitled to vote at the SIRIUS
    special meeting will be available for examination by any SIRIUS
    stockholder at SIRIUS headquarters, 1221 Avenue of the
    Americas, 36th Floor, New York, New York for purposes
    pertaining to the SIRIUS special meeting, during normal business
    hours for a period of ten days before the SIRIUS special
    meeting, and at the time and place of the SIRIUS special meeting.
 
    Quorum
    and Votes Required
 
    In order to carry on the business of the meeting, SIRIUS must
    have a quorum. A quorum requires the presence, in person or by
    proxy, of the holders of a majority of the votes entitled to be
    cast at the meeting.
 
    Required
    Vote to Adopt the Charter Amendment (Item 1 on the Proxy
    Card)
 
    The affirmative vote of a majority of the outstanding shares of
    common stock of SIRIUS entitled to vote is required to approve
    the Charter Amendment.
    
    62
 
    Required
    Vote to Approve the Share Issuance (Item 2 on the Proxy
    Card)
 
    The affirmative vote of a majority of the SIRIUS shares voting
    on the proposal is required to approve the Share Issuance.
 
    Treatment
    of Abstentions, Not Voting and Incomplete Proxies
 
    If a SIRIUS stockholder fails to vote on the Charter Amendment
    or responds to the Charter Amendment with an abstain
    vote, it will have the same effect as a vote against that
    proposal. If a SIRIUS stockholder fails to vote on the Share
    Issuance or responds to the Share Issuance with an
    abstain vote, it will have no effect on the outcome
    of the vote for the proposal. If a proxy is received without
    indication as to how to vote, the SIRIUS stock represented by
    that proxy will be considered to be voted in favor of all
    matters for consideration at the SIRIUS special meeting. If a
    SIRIUS stockholder responds but does not indicate how it wants
    to vote on the proposals, the proxy will be counted as a vote in
    favor of the proposals.
 
    Voting by
    SIRIUS Directors and Executive Officers
 
    On the SIRIUS record date, directors and executive officers of
    SIRIUS and their affiliates owned and were entitled to
    vote    shares of SIRIUS common stock, or
    approximately     %
    and     %, respectively, of the total
    voting power of the shares of SIRIUS common stock and shares of
    SIRIUS capital stock outstanding on that date.
 
    Voting of
    Proxies
 
    Giving a proxy means that a SIRIUS stockholder authorizes the
    persons named in the enclosed proxy card to vote its shares at
    the SIRIUS special meeting in the manner it directs. A SIRIUS
    stockholder may vote by proxy or in person at the meeting. To
    vote by proxy, a SIRIUS stockholder may use one of the following
    methods if it is a registered holder (that is, it holds its
    stock in its own name):
 
    |  |  |  | 
    |  |  | Telephone voting, by dialing the toll-free number and
    following the instructions on the proxy card; | 
|  | 
    |  |  | Via the Internet, by going to the web
    address          
    and following the instructions on the proxy card; or | 
|  | 
    |  |  | Mail, by completing and returning the proxy card in the
    enclosed envelope. The envelope requires no additional postage
    if mailed in the United States. | 
 
    SIRIUS requests that SIRIUS stockholders complete and sign the
    accompanying proxy and return it to SIRIUS as soon as possible
    in the enclosed postage-paid envelope. When the accompanying
    proxy is returned properly executed, the shares of SIRIUS stock
    represented by it will be voted at the SIRIUS special meeting in
    accordance with the instructions contained on the proxy card.
 
    If any proxy is returned without indication as to how to vote,
    the SIRIUS stock represented by the proxy will be considered a
    vote in favor of all matters for consideration at the SIRIUS
    special meeting. Unless a SIRIUS stockholder checks the box on
    its proxy card to withhold discretionary authority, the
    proxyholders may use their discretion to vote on other matters
    relating to the SIRIUS special meeting.
 
    If a SIRIUS stockholders shares are held in street
    name by a broker or other nominee, the stockholder should
    check the voting form used by that firm to determine whether it
    may vote by telephone or the Internet.
 
    Every SIRIUS stockholders vote is important.
    Accordingly, each SIRIUS stockholder should sign, date and
    return the enclosed proxy card, or vote via the Internet or by
    telephone, whether or not it plans to attend the SIRIUS special
    meeting in person.
 
    Revocability
    of Proxies and Changes to a SIRIUS Stockholders
    Vote
 
    A SIRIUS stockholder has the power to change its vote at any
    time before its shares are voted at the special meeting by:
 
    |  |  |  | 
    |  |  | notifying SIRIUS Corporate Secretary, Patrick L. Donnelly,
    in writing at Sirius Satellite Radio Inc., 1221 Avenue of
    the Americas, 36th Floor, New York, New York 10020 that you
    are revoking your proxy; or | 
    
    63
 
 
    |  |  |  | 
    |  |  | executing and delivering a later dated proxy card or submitting
    a later dated vote by telephone or in the internet; or | 
|  | 
    |  |  | voting in person at the special meeting. | 
 
    However, if a SIRIUS stockholder has shares held through a
    brokerage firm, bank or other custodian, it may revoke its
    instructions only by informing the custodian in accordance with
    any procedures it has established.
 
    Solicitation
    of Proxies
 
    The solicitation of proxies from SIRIUS stockholders is made on
    behalf of the SIRIUS board of directors. SIRIUS and XM will
    generally share equally the cost and expenses of printing and
    mailing this Proxy Statement and all fees paid to the SEC.
    SIRIUS will pay the costs of soliciting and obtaining these
    proxies, including the cost of reimbursing brokers, banks and
    other financial institutions for forwarding proxy materials to
    their customers. Proxies may be solicited, without extra
    compensation, by SIRIUS officers and employees by mail,
    telephone, fax, personal interviews or other methods of
    communication. SIRIUS has engaged the firm
    of          
    to assist SIRIUS in the distribution and solicitation of proxies
    from SIRIUS stockholders and will
    pay          
    an estimated fee of $      plus
    out-of-pocket expenses for its services. XM will pay the costs
    of soliciting and obtaining its proxies and all other expenses
    related to the XM special meeting.
 
    Delivery
    of Proxy Materials to Households Where Two or More Stockholders
    Reside
 
    As permitted by the Exchange Act, only one copy of this Proxy
    Statement is being delivered to stockholders residing at the
    same address, unless SIRIUS stockholders have notified SIRIUS of
    their desire to receive multiple copies of the Proxy Statement.
    This is known as householding.
 
    SIRIUS will promptly deliver, upon oral or written request, a
    separate copy of this Proxy Statement to any stockholder
    residing at an address to which only one copy was mailed.
    Requests for additional copies for this year or future years
    should be directed to: Sirius Satellite Radio Inc., Attention:
    Corporate Secretary, 1221 Avenue of the Americas,
    36th Floor, New York, New York 10020.
 
    Attending
    the Meeting
 
    Subject to space availability, all stockholders as of the record
    date, or their duly appointed proxies, may attend the meeting.
    Since seating is limited, admission to the meeting will be on a
    first-come, first-served basis. Registration and seating will
    begin at   a.m., local time.
 
    If you are a registered stockholder (that is, if you hold your
    stock in certificate form), an admission ticket is enclosed with
    your proxy card. If you wish to attend the special meeting,
    please vote your proxy but keep the admission ticket and bring
    it with you to the special meeting.
 
    If your shares are held in street name (that is,
    through a bank, broker or other holder of record) and you wish
    to attend the special meeting, you need to bring a copy of a
    bank or brokerage statement to the special meeting reflecting
    your stock ownership as of the SIRIUS record date.
 
    |  |  | 
    | Item 1. | The
    Charter Amendment | 
 
    (Item 1 on Proxy Card)
 
    SIRIUS is proposing to increase the number of authorized shares
    of SIRIUS common stock from 2,500,000,000 shares
    to           shares.
    To effect this change, SIRIUS must amend its certificate of
    incorporation.
 
    SIRIUS currently has 2,500,000,000 shares of SIRIUS common
    stock authorized for issuance. On the SIRIUS record date, SIRIUS
    had
    outstanding           shares
    of SIRIUS common stock and approximately shares of SIRIUS common
    stock issuable based on options and stock-based awards. Based on
    the number of shares of XM common stock, convertible securities,
    and options and warrants to acquire XM common stock outstanding
    as of the
    
    64
 
    SIRIUS record date, as a result of the merger, SIRIUS can expect
    to issue up to approximately 1.7 billion additional shares
    of SIRIUS common stock. SIRIUS is proposing to increase the
    number of authorized shares of SIRIUS common stock to give it
    sufficient authorized shares to complete the merger. The
    increased share authorization will also provide greater
    flexibility in the capital structure of the resulting company by
    allowing it to raise capital that may be necessary to further
    develop its business, to fund potential acquisitions, to have
    shares available for use in connection with stock plans and to
    pursue other corporate purposes that may be identified by the
    board of directors.
 
    The SIRIUS board of directors will determine whether, when and
    on what terms the issuance of shares of SIRIUS common stock may
    be warranted in connection with any future actions. No further
    action or authorization by SIRIUS stockholders will be necessary
    before issuance of the additional shares of SIRIUS common stock
    authorized under the amended and restated certificate of
    incorporation, except as may be required for a particular
    transaction by applicable law or regulatory agencies or by the
    rules of the NASDAQ or any other stock exchange on which the
    SIRIUS common stock may then be listed.
 
    Although an increase in the authorized shares of SIRIUS common
    stock could, under certain circumstances, also be construed as
    having an anti-takeover effect (for example, by permitting
    easier dilution of the stock ownership of a person seeking to
    effect a change in the composition of the board of directors or
    contemplating a tender offer or other transaction resulting in
    the acquisition of SIRIUS by another company), the proposed
    increase in shares authorized is not in response to any effort
    by any person or group to accumulate SIRIUS common stock or to
    obtain control of SIRIUS by any means. In addition, the proposal
    is not part of any plan by the SIRIUS board of directors to
    recommend or implement a series of anti-takeover measures.
 
    The increase in the number of authorized shares of SIRIUS common
    stock is necessary to effect the merger. The Charter Amendment
    will become effective only in connection with and immediately
    before the time of completion of the merger. This
    Proposal 1 is conditioned on the approval of
    Proposal 2, and the approval of both of these Proposals is
    required for completion of the merger.
 
    The
    SIRIUS board of directors recommends a vote FOR the
    Charter Amendment (Item 1).
 
    |  |  | 
    | Item 2. | The
    Share Issuance | 
 
    (Item 2 on Proxy Card)
 
    It is a condition to completion of the merger that SIRIUS issue
    shares of SIRIUS common stock and SIRIUS Series A
    convertible preferred stock in the merger. When the merger
    becomes effective, each share of XM common stock outstanding
    immediately before the merger will be converted into the right
    to receive 4.6 shares of SIRIUS common stock. Each share of
    Series A convertible preferred stock of XM outstanding
    immediately before the merger will be similarly converted into
    the right to receive 4.6 shares of newly designated series
    of SIRIUS convertible preferred stock, which has substantially
    the same powers, designations, preferences, rights and
    qualifications. For a description of the new series of SIRIUS
    convertible preferred stock, see Description of SIRIUS
    Capital Stock  Description of SIRIUS Preferred
    Stock  Series A Convertible Preferred
    Stock on page 80. Under Rule 4350(i) of the
    NASDAQ, a company listed on the NASDAQ is required to obtain
    stockholder approval in connection with a merger with another
    company if the number of shares of common stock or securities
    convertible into common stock to be issued is in excess of 20%
    of the number of shares of common stock then outstanding. If the
    merger is completed, SIRIUS will issue up to approximately
    1.7 billion shares of SIRIUS common stock in the
    merger. On an as converted basis, the aggregate number of shares
    of SIRIUS common stock to be issued in the merger will exceed
    20% of the shares of SIRIUS common stock outstanding on the
    record date for the SIRIUS special meeting, and for this reason
    SIRIUS must obtain the approval of SIRIUS stockholders for the
    issuance of these securities to XM stockholders in the merger.
 
    SIRIUS is asking its stockholders to approve the Share Issuance.
    The issuance of these securities to XM stockholders is necessary
    to effect the merger. This Proposal 2 is conditioned on the
    approval of Proposal 1, and the approval of both of these
    Proposals is required for completion of the merger.
    
    65
 
    The
    SIRIUS board of directors recommends a vote FOR the Share
    Issuance (Item 2).
 
    |  |  | 
    | Item 3. | Possible
    Adjournment or Postponement of the SIRIUS Special
    Meeting | 
 
    (Item 3 on Proxy Card)
 
    The SIRIUS special meeting may be adjourned or postponed to
    another time or place to permit, among other things, further
    solicitation of proxies if necessary to obtain additional votes
    in favor of the Charter Amendment and Share Issuance.
 
    The
    SIRIUS board of directors recommends a vote FOR this
    item.
 
    Other
    Matters to Come Before the Meeting
 
    No other matters are intended to be brought before the meeting
    by SIRIUS, and SIRIUS does not know of any matters to be brought
    before the meeting by others. If, however, any other matters
    properly come before the meeting, the persons named in the proxy
    will vote the shares represented thereby in accordance with the
    judgment of management on any such matter.
    
    66
 
 
    XM
    SPECIAL MEETING
 
    Date,
    Time and Place
 
    These proxy materials are delivered in connection with the
    solicitation by the XM board of directors of proxies to be voted
    at the XM special meeting, which is to be held
    at          
    at   a.m., local time
    on          ,
    2007. On or
    about          ,
    2007, XM commenced mailing this Proxy Statement and the enclosed
    form of proxy to its stockholders entitled to vote at the
    meeting.
 
    Purpose
    of the XM Special Meeting
 
    XM stockholders will be asked to vote on the following proposals:
 
    |  |  |  | 
    |  |  | to adopt the merger agreement, which we refer to as the Merger
    Proposal (Item 1 on the Proxy Card); | 
|  | 
    |  |  | to approve any motion to adjourn or postpone the special meeting
    to another time or place, if necessary, to solicit additional
    proxies (Item 2 on the Proxy Card); and | 
|  | 
    |  |  | to conduct any other business that properly comes before the XM
    special meeting and any adjournment or postponement thereof. | 
 
    XM Record
    Date; Stock Entitled to Vote
 
    The close of business
    on          ,
    2007, which we refer to as the XM record date, has been fixed as
    the record date for the determination of stockholders entitled
    to notice of, and to vote at, the XM special meeting or any
    adjournments or postponements of the XM special meeting.
 
    As of the XM record date the following shares were outstanding
    and entitled to vote:
 
    |  |  |  |  |  |  |  |  |  | 
|  |  | Shares 
 |  |  | Votes 
 |  | 
| 
    Designation
 |  | Outstanding |  |  | Per Share |  | 
|  | 
| 
    XM common stock
    
 |  |  |  |  |  |  | 1 |  | 
 
    A complete list of stockholders entitled to vote at the XM
    special meeting will be available for examination by any XM
    stockholder at XM headquarters, 1500 Eckington Place, N.E.,
    Washington, DC 20002 for purposes pertaining to the XM special
    meeting, during normal business hours for a period of ten days
    before the XM special meeting, and at the time and place of the
    XM special meeting.
 
    Quorum
    and Votes Required
 
    In order to carry on the business of the meeting, XM must have a
    quorum. A quorum requires the presence, in person or by proxy,
    of the holders of a majority of the votes entitled to be cast at
    the meeting.
 
    Required
    Vote to adopt the Merger Proposal (Item 1 on the Proxy
    Card)
 
    The affirmative vote of a majority of the outstanding shares of
    XM common stock is required to approve the Merger Proposal.
 
    Treatment
    of Abstentions, Not Voting and Incomplete Proxies
 
    If an XM stockholder fails to vote on the Merger Proposal or
    responds to the Merger Proposal with an abstain
    vote, it will have the same effect as a vote against that
    proposal. If an XM stockholder responds but does not indicate
    how it wants to vote on the proposal, the proxy will be counted
    as a vote in favor of the proposal.
 
    Voting by
    XM Directors and Executive Officers
 
    On the XM record date, directors and executive officers of XM
    and their affiliates owned and were entitled to
    vote    shares of XM common stock, or
    approximately     %
    and     %, respectively, of the total
    voting power of the shares of XM common stock and shares of XM
    capital stock outstanding on that date.
    
    67
 
 
    Voting of
    Proxies
 
    Giving a proxy means that an XM stockholder authorizes the
    persons named in the enclosed proxy card to vote its shares at
    the XM special meeting in the manner it directs. An XM
    stockholder may vote by proxy or in person at the meeting. To
    vote by proxy, an XM stockholder may use one of the following
    methods if it is a registered holder (that is, it holds its
    stock in its own name):
 
    |  |  |  | 
    |  |  | Telephone voting, by dialing the toll-free number and
    following the instructions on the proxy card; | 
|  | 
    |  |  | Via the Internet, by going to the web
    address          
    and following the instructions on the proxy card; or | 
|  | 
    |  |  | Mail, by completing and returning the proxy card in the
    enclosed envelope. The envelope requires no additional postage
    if mailed in the United States. | 
 
    XM requests that XM stockholders complete and sign the
    accompanying proxy and return it to XM as soon as possible in
    the enclosed postage-paid envelope. When the accompanying proxy
    is returned properly executed, the shares of SIRIUS stock
    represented by it will be voted at the XM special meeting in
    accordance with the instructions contained on the proxy card.
 
    If any proxy is returned without indication as to how to vote,
    the XM stock represented by the proxy will be considered a vote
    in favor of all matters for consideration at the XM special
    meeting. Unless an XM stockholder checks the box on its proxy
    card to withhold discretionary authority, the proxyholders may
    use their discretion to vote on other matters relating to the XM
    special meeting.
 
    If an XM stockholders shares are held in street
    name by a broker or other nominee, the stockholder should
    check the voting form used by that firm to determine whether it
    may vote by telephone or the Internet.
 
    Every XM stockholders vote is important. Accordingly,
    each XM stockholder should sign, date and return the enclosed
    proxy card, or vote via the Internet or by telephone, whether or
    not it plans to attend the XM special meeting in person.
 
    Revocability
    of Proxies and Changes to an XM Stockholders
    Vote
 
    A XM stockholder has the power to change its vote at any time
    before its shares are voted at the special meeting by:
 
    |  |  |  | 
    |  |  | Notifying XMs Corporate Secretary, Joseph M. Titlebaum, in
    writing at XM Satellite Radio Holdings Inc., 1500 Eckington
    Place, NE, Washington, DC 20002 that you are revoking your
    proxy; or | 
|  | 
    |  |  | Executing and delivering a later dated proxy card or submitting
    a later dated vote by telephone or through the Internet; or | 
|  | 
    |  |  | Voting in person at the special meeting. | 
 
    However, if an XM stockholder has shares held through a
    brokerage firm, bank or other custodian, it may revoke its
    instructions only by informing the custodian in accordance with
    any procedures it has established.
 
    Solicitation
    of Proxies
 
    The solicitation of proxies from XM stockholders is made on
    behalf of the XM board of directors. SIRIUS and XM will
    generally share equally the costs and expenses of printing and
    mailing this Proxy Statement and all fees paid to the SEC. XM
    will pay the costs of soliciting and obtaining these proxies,
    including the cost of reimbursing brokers, banks and other
    financial institutions for forwarding proxy materials to their
    customers. Proxies may be solicited, without extra compensation,
    by XM officers and employees by mail, telephone, fax, personal
    interviews or other methods of communication. XM has engaged the
    firm
    of          
    to assist XM in the distribution and solicitation of proxies
    from XM stockholders and will
    pay          
    an estimated fee of
    $          plus
    out-of-pocket expenses for its services. XM will pay the costs
    of soliciting and obtaining its proxies and all other expenses
    related to the XM special meeting.
    
    68
 
 
    Attending
    the Meeting
 
    Subject to space availability, all stockholders as of the XM
    record date, or their duly appointed proxies, may attend the
    meeting. Since seating is limited, admission to the meeting will
    be on a first-come, first-served basis. Registration and seating
    will begin at   a.m., local time.
 
    If you are a registered stockholder (that is, if you hold your
    stock in certificate form), an admission ticket is enclosed with
    your proxy card. If you wish to attend the special meeting,
    please vote your proxy but keep the admission ticket and bring
    it with you to the special meeting.
 
    If your shares are held in street name (that is,
    through a bank, broker or other holder of record) and you wish
    to attend the XM special meeting, you need to bring a copy of a
    bank or brokerage statement to the XM special meeting reflecting
    your stock ownership as of the record date.
 
    |  |  | 
    | Item 1. | The
    Merger Proposal | 
 
    (Item 1 on Proxy Card)
 
    As discussed elsewhere in this Proxy Statement, XM is asking its
    stockholders to approve the Merger Proposal. Holders of XM
    common stock should read carefully this Proxy Statement in its
    entirety, including the annexes, for more detailed information
    concerning the merger agreement and the merger. In particular,
    holders of XM common stock are directed to the merger agreement,
    a copy of which is Annex A to this Proxy Statement.
 
    The XM
    board of directors recommends a vote FOR the Merger
    Proposal (Item 1).
 
    |  |  | 
    | Item 2. | Possible
    Adjournment or Postponement of the XM Special
    Meeting | 
 
    (Item 2 on Proxy Card)
 
    The XM special meeting may be adjourned or postponed to another
    time or place, if necessary, to solicit additional proxies if
    there are insufficient votes at the time of the XM special
    meeting to approve the Merger Proposal (Proposal 1 above).
 
    The XM
    board of directors recommends a vote FOR this
    Item 2.
 
    Other
    Matters to Come Before the Meeting
 
    No other matters are intended to be brought before the special
    meeting by XM, and XM does not know of any matters to be brought
    before the meeting by others. If, however, any other matters
    properly come before the XM special meeting, the persons named
    in the proxy will vote the shares represented thereby in
    accordance with the judgment of management on any such matter.
    
    69
 
 
    UNAUDITED
    PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
    The unaudited pro forma condensed combined balance sheet
    combines the historical consolidated balance sheets of SIRIUS
    and XM, giving effect to the merger as if it had been
    consummated on March 31, 2007 and the unaudited pro forma
    condensed combined statements of operations for the three months
    ended March 31, 2007 and for the year ended
    December 31, 2006, giving effect to the merger as if it had
    occurred on January 1, 2006. The historical consolidated
    financial information has been adjusted to give effect to pro
    forma events that are (i) directly attributable to the
    merger, (ii) factually supportable, and (iii) with
    respect to the statement of operations, expected to have a
    continuing impact on the combined results. Intercompany
    transactions have not been eliminated as the preliminary
    estimates are not material to the unaudited pro forma condensed
    combined financial statements.
 
    These unaudited pro forma condensed combined financial
    statements should be read in conjunction with the historical
    audited consolidated financial information and accompanying
    notes of SIRIUS and XM, which have been incorporated by
    reference into this Proxy Statement. The unaudited pro forma
    condensed combined financial statements are not necessarily
    indicative of the operating results or financial position that
    would have occurred if the merger had been completed at the
    dates indicated. It may be necessary to further reclassify
    XMs financial statements to conform to those
    classifications that are determined by the combined company to
    be most appropriate. While some reclassifications of prior
    periods have been included in the unaudited pro forma condensed
    combined financial statements, further reclassifications may be
    necessary.
 
    The unaudited pro forma condensed combined financial statements
    were prepared using the purchase method of accounting with
    SIRIUS treated as the acquiring entity. Accordingly,
    consideration paid by SIRIUS to complete the merger with XM will
    be allocated to XMs assets and liabilities based upon
    their estimated fair values as of the date of completion of the
    merger. The allocation is dependent upon certain valuations and
    other studies that have not progressed to a stage where there is
    sufficient information to make a definitive allocation.
    Additionally, a final determination of the fair value of
    XMs assets and liabilities, which cannot be made prior to
    the completion of the transaction, will be based on the actual
    net tangible and intangible assets of XM that exist as of the
    date of completion of the merger. Accordingly, the pro forma
    purchase price adjustments are preliminary, subject to further
    adjustments as additional information becomes available and as
    additional analyses are performed and have been made solely for
    the purpose of providing the unaudited pro forma condensed
    combined financial information presented below. Certain
    valuations have not been performed on tangible and intangible
    assets and liabilities such as property and equipment and
    deferred revenue and therefore an estimate of fair value is not
    included as a pro forma adjustment. Upon completion of the
    merger, final valuations will be performed. Increases or
    decreases in the fair value of relevant balance sheet amounts
    including property and equipment, deferred revenue, debt and
    intangibles will result in adjustments to the balance sheet
    and/or
    statement of operations. There can be no assurance that the
    final determination will not result in material changes.
 
    SIRIUS expects to incur significant costs associated with
    integrating SIRIUS and XMs businesses. The unaudited
    pro forma condensed combined financial statements do not reflect
    the cost of any integration activities or benefits that may
    result from synergies that may be derived from any integration
    activities.
    
    70
 
    SIRIUS
    SATELLITE RADIO INC. AND SUBSIDIARIES
    
    Unaudited Pro Forma Combined Statement of Operations
    For the three months ended March 31, 2007
    (In thousands, except per share amounts)
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  | Pro Forma 
 |  |  |  |  | 
|  |  | SIRIUS |  |  | XM |  |  | Adjustments |  |  | Combined |  | 
|  | 
| 
    Revenue:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscriber revenue, including
    effects of mail-in rebates
    
 |  | $ | 190,796 |  |  | $ | 236,486 |  |  | $ | 4,654 | (a) |  | $ | 431,936 |  | 
| 
    Advertising revenue, net of agency
    fees
    
 |  |  | 6,721 |  |  |  | 7,478 |  |  |  |  |  |  |  | 14,199 |  | 
| 
    Equipment revenue
    
 |  |  | 4,671 |  |  |  | 5,297 |  |  |  |  |  |  |  | 9,968 |  | 
| 
    Other revenue
    
 |  |  | 1,849 |  |  |  | 14,851 |  |  |  | (4,654 | )(a) |  |  | 12,046 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total revenue
    
 |  |  | 204,037 |  |  |  | 264,112 |  |  |  |  |  |  |  | 468,149 |  | 
| 
    Operating expenses (excludes
    depreciation shown separately below)(1):
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Cost of services:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Satellite and transmission
    
 |  |  | 7,986 |  |  |  | 13,882 |  |  |  | 6,544 | (b) |  |  | 28,412 |  | 
| 
    Programming and content
    
 |  |  | 59,998 |  |  |  | 43,952 |  |  |  |  |  |  |  | 103,950 |  | 
| 
    Revenue share and royalties
    
 |  |  | 27,134 |  |  |  | 47,426 |  |  |  |  |  |  |  | 74,560 |  | 
| 
    Customer service and billing
    
 |  |  | 21,853 |  |  |  | 27,928 |  |  |  |  |  |  |  | 49,781 |  | 
| 
    Cost of equipment
    
 |  |  | 9,292 |  |  |  | 18,277 |  |  |  |  |  |  |  | 27,569 |  | 
| 
    Broadcast and operations
    
 |  |  |  |  |  |  | 16,260 |  |  |  | (16,260 | )(b) |  |  |  |  | 
| 
    Sales and marketing
    
 |  |  | 38,162 |  |  |  |  |  |  |  | 45,950 | (c)(d) |  |  | 84,112 |  | 
| 
    Ad sales
    
 |  |  |  |  |  |  | 3,385 |  |  |  | (3,385 | )(c) |  |  |  |  | 
| 
    Marketing
    
 |  |  |  |  |  |  | 86,167 |  |  |  | (86,167 | )(c) |  |  |  |  | 
| 
    Subscriber acquisition costs
    
 |  |  | 100,117 |  |  |  |  |  |  |  | 43,602 | (d) |  |  | 143,719 |  | 
| 
    General and administrative
    
 |  |  | 35,343 |  |  |  | 34,185 |  |  |  | 9,716 | (b) |  |  | 79,244 |  | 
| 
    Engineering, design and development
    
 |  |  | 12,411 |  |  |  | 7,310 |  |  |  |  |  |  |  | 19,721 |  | 
| 
    Depreciation and amortization
    
 |  |  | 26,786 |  |  |  | 53,386 |  |  |  | 31,917 | (f) |  |  | 112,089 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total operating expenses
    
 |  |  | 339,082 |  |  |  | 352,158 |  |  |  | 31,917 |  |  |  | 723,157 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Loss from operations
    
 |  |  | (135,045 | ) |  |  | (88,046 | ) |  |  | (31,917 | ) |  |  | (255,008 | ) | 
| 
    Other income (expense):
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Interest and investment income
    
 |  |  | 6,042 |  |  |  | 3,544 |  |  |  |  |  |  |  | 9,586 |  | 
| 
    Interest expense, net of amounts
    capitalized
    
 |  |  | (15,192 | ) |  |  | (27,609 | ) |  |  | 4,192 | (e) |  |  | (38,609 | ) | 
| 
    Loss from de-leveraging transactions
    
 |  |  |  |  |  |  | (2,965 | ) |  |  |  |  |  |  | (2,965 | ) | 
| 
    Other income (expense)
    
 |  |  | 5 |  |  |  | (6,678 | ) |  |  |  |  |  |  | (6,673 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total other income (expense)
    
 |  |  | (9,145 | ) |  |  | (33,708 | ) |  |  | 4,192 |  |  |  | (38,661 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Loss before income taxes
    
 |  |  | (144,190 | ) |  |  | (121,754 | ) |  |  | (27,725 | ) |  |  | (293,669 | ) | 
| 
    Income tax expense
    
 |  |  | (555 | ) |  |  | (684 | ) |  |  |  |  |  |  | (1,239 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Net loss attributable to common
    stockholders
    
 |  | $ | (144,745 | ) |  | $ | (122,438 | ) |  | $ | (27,725 | ) |  | $ | (294,908 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Net loss per common
    share  basic and diluted
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (0.10 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Weighted average shares used in
    computing net loss per common share  basic and diluted
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,879,881 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    See Notes to Unaudited Pro Forma
    Condensed Combined Financial Statements
    
 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    (1) Amounts related to
    stock-based compensation included in other operating expenses
    were as follows:
    
 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
       Satellite
    and transmission
    
 |  | $ | 656 |  |  | $ | 520 |  |  | $ | 600 | (b) |  | $ | 1,776 |  | 
| 
       Programming
    and content
    
 |  |  | 2,935 |  |  |  | 2,166 |  |  |  |  |  |  |  | 5,101 |  | 
| 
       Broadcast
    and operations
    
 |  |  |  |  |  |  | 978 |  |  |  | (978 | )(b) |  |  |  |  | 
| 
       Customer
    service and billing
    
 |  |  | 199 |  |  |  | 440 |  |  |  |  |  |  |  | 639 |  | 
| 
       Sales
    and marketing
    
 |  |  | 5,644 |  |  |  |  |  |  |  | 2,253 | (c) |  |  | 7,897 |  | 
| 
       Ad
    sales
    
 |  |  |  |  |  |  | 356 |  |  |  | (356 | )(c) |  |  |  |  | 
| 
       Marketing
    
 |  |  |  |  |  |  | 1,897 |  |  |  | (1,897 | )(c) |  |  |  |  | 
| 
       Subscriber
    acquisition costs
    
 |  |  | 1,880 |  |  |  |  |  |  |  |  |  |  |  | 1,880 |  | 
| 
       General
    and administrative
    
 |  |  | 11,940 |  |  |  | 6,048 |  |  |  | 378 | (b) |  |  | 18,366 |  | 
| 
       Engineering,
    design and development
    
 |  |  | 1,006 |  |  |  | 1,726 |  |  |  |  |  |  |  | 2,732 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
       Total
    stock based compensation
    
 |  | $ | 24,260 |  |  | $ | 14,131 |  |  | $ |  |  |  | $ | 38,391 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
    
    71
 
    SIRIUS
    SATELLITE RADIO INC. AND SUBSIDIARIES
    
    Unaudited Pro Forma Condensed Combined Statement of
    Operations
    For the Year ended December 31, 2006
    (In thousands, except per share amounts)
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  | Pro Forma 
 |  |  |  |  | 
|  |  | SIRIUS |  |  | XM |  |  | Adjustments |  |  | Combined |  | 
|  | 
| 
    Revenue:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Subscriber revenue, including
    effects of mail-in rebates
    
 |  | $ | 575,404 |  |  | $ | 825,626 |  |  | $ | 16,192 | (a) |  | $ | 1,417,222 |  | 
| 
    Advertising revenue, net of agency
    fees
    
 |  |  | 31,044 |  |  |  | 35,330 |  |  |  |  |  |  |  | 66,374 |  | 
| 
    Equipment revenue
    
 |  |  | 26,798 |  |  |  | 21,720 |  |  |  |  |  |  |  | 48,518 |  | 
| 
    Other revenue
    
 |  |  | 3,989 |  |  |  | 50,741 |  |  |  | (16,192 | )(a) |  |  | 38,538 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total revenue
    
 |  |  | 637,235 |  |  |  | 933,417 |  |  |  |  |  |  |  | 1,570,652 |  | 
| 
    Operating expenses (excludes
    depreciation shown separately below)(1):
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Cost of services:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Satellite and transmission
    
 |  |  | 41,797 |  |  |  | 49,019 |  |  |  | 23,049 | (b) |  |  | 113,865 |  | 
| 
    Programming and content
    
 |  |  | 520,424 |  |  |  | 165,196 |  |  |  |  |  |  |  | 685,620 |  | 
| 
    Revenue share and royalties
    
 |  |  | 69,918 |  |  |  | 149,010 |  |  |  |  |  |  |  | 218,928 |  | 
| 
    Customer service and billing
    
 |  |  | 76,462 |  |  |  | 104,871 |  |  |  |  |  |  |  | 181,333 |  | 
| 
    Cost of equipment
    
 |  |  | 35,233 |  |  |  | 48,949 |  |  |  |  |  |  |  | 84,182 |  | 
| 
    Broadcast and operations
    
 |  |  |  |  |  |  | 57,732 |  |  |  | (57,732 | )(b) |  |  |  |  | 
| 
    Sales and marketing
    
 |  |  | 203,682 |  |  |  |  |  |  |  | 212,343 | (c)(d)(g) |  |  | 416,025 |  | 
| 
    Ad sales
    
 |  |  |  |  |  |  | 15,961 |  |  |  | (15,961 | )(c) |  |  |  |  | 
| 
    Marketing
    
 |  |  |  |  |  |  | 421,083 |  |  |  | (421,083 | )(c) |  |  |  |  | 
| 
    Subscriber acquisition costs
    
 |  |  | 451,614 |  |  |  |  |  |  |  | 224,701 | (d)(g) |  |  | 676,315 |  | 
| 
    General and administrative
    
 |  |  | 129,953 |  |  |  | 88,626 |  |  |  | 34,683 | (b) |  |  | 253,262 |  | 
| 
    Engineering, design and development
    
 |  |  | 70,127 |  |  |  | 37,428 |  |  |  |  |  |  |  | 107,555 |  | 
| 
    Depreciation and amortization
    
 |  |  | 105,749 |  |  |  | 198,640 |  |  |  | 127,667 | (f) |  |  | 432,056 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total operating expenses
    
 |  |  | 1,704,959 |  |  |  | 1,336,515 |  |  |  | 127,667 |  |  |  | 3,169,141 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Loss from operations
    
 |  |  | (1,067,724 | ) |  |  | (403,098 | ) |  |  | (127,667 | ) |  |  | (1,598,489 | ) | 
| 
    Other income (expense):
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Interest and investment income
    
 |  |  | 33,320 |  |  |  | 21,664 |  |  |  |  |  |  |  | 54,984 |  | 
| 
    Interest expense, net of amounts
    capitalized
    
 |  |  | (64,032 | ) |  |  | (121,304 | ) |  |  | 16,767 | (e) |  |  | (168,569 | ) | 
| 
    Loss from de-leveraging transactions
    
 |  |  |  |  |  |  | (122,189 | ) |  |  |  |  |  |  | (122,189 | ) | 
| 
    Loss from impairment of investments
    
 |  |  |  |  |  |  | (76,572 | ) |  |  |  |  |  |  | (76,572 | ) | 
| 
    Other expense
    
 |  |  | (4,366 | ) |  |  | (17,387 | ) |  |  |  |  |  |  | (21,753 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total other income (expense)
    
 |  |  | (35,078 | ) |  |  | (315,788 | ) |  |  | 16,767 |  |  |  | (334,099 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Loss before income taxes
    
 |  |  | (1,102,802 | ) |  |  | (718,886 | ) |  |  | (110,900 | ) |  |  | (1,932,588 | ) | 
| 
    Income tax (expense) benefit
    
 |  |  | (2,065 | ) |  |  | 14 |  |  |  |  |  |  |  | (2,051 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Net loss
    
 |  |  | (1,104,867 | ) |  |  | (718,872 | ) |  |  | (110,900 | ) |  |  | (1,934,639 | ) | 
| 
    Dividend requirements
    
 |  |  |  |  |  |  | (6,127 | ) |  |  |  |  |  |  | (6,127 | ) | 
| 
    Preferred stock retirement loss
    
 |  |  |  |  |  |  | (6,693 | ) |  |  |  |  |  |  | (6,693 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Net loss attributable to common
    stockholders
    
 |  | $ | (1,104,867 | ) |  | $ | (731,692 | ) |  | $ | (110,900 | ) |  | $ | (1,947,459 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Net loss per common
    share  basic and diluted
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (0.73 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Weighted average shares used in
    computing net loss per common share  basic and diluted
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,663,151 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    See Notes to Unaudited Pro Forma
    Condensed Combined Financial Statements
    
 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  | 
| 
    (1) Amounts related to
    stock-based compensation included in other operating expenses
    were as follows:
    
 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
       Satellite
    and transmission
    
 |  | $ | 2,568 |  |  | $ | 2,649 |  |  | $ | 2,880 | (b) |  | $ | 8,097 |  | 
| 
       Programming
    and content
    
 |  |  | 321,774 |  |  |  | 10,878 |  |  |  |  |  |  |  | 332,652 |  | 
| 
       Broadcast
    and operations
    
 |  |  |  |  |  |  | 5,305 |  |  |  | (5,305 | )(b) |  |  |  |  | 
| 
       Customer
    service and billing
    
 |  |  | 812 |  |  |  | 1,338 |  |  |  |  |  |  |  | 2,150 |  | 
| 
       Sales
    and marketing
    
 |  |  | 19,543 |  |  |  |  |  |  |  | 11,097 | (c) |  |  | 30,640 |  | 
| 
       Ad
    sales
    
 |  |  |  |  |  |  | 2,397 |  |  |  | (2,397 | )(c) |  |  |  |  | 
| 
       Marketing
    
 |  |  |  |  |  |  | 8,700 |  |  |  | (8,700 | )(c) |  |  |  |  | 
| 
       Subscriber
    acquisition costs
    
 |  |  | 31,898 |  |  |  |  |  |  |  |  |  |  |  | 31,898 |  | 
| 
       General
    and administrative
    
 |  |  | 49,928 |  |  |  | 28,124 |  |  |  | 2,425 | (b) |  |  | 80,477 |  | 
| 
       Engineering,
    design and development
    
 |  |  | 11,395 |  |  |  | 8,655 |  |  |  |  |  |  |  | 20,050 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
       Total
    stock-based compensation
    
 |  | $ | 437,918 |  |  | $ | 68,046 |  |  | $ |  |  |  | $ | 505,964 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
    
    72
 
    SIRIUS
    SATELLITE RADIO INC. AND SUBSIDIARIES
    
    Unaudited Pro Forma Condensed Combined Balance Sheet
    As of March 31, 2007
    (In thousands, except per share amounts)
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  | Pro Forma 
 |  |  |  |  | 
|  |  | SIRIUS |  |  | XM |  |  | Adjustments |  |  | Combined |  | 
|  | 
| ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Current assets:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Cash and cash equivalents
    
 |  | $ | 259,162 |  |  | $ | 319,391 |  |  | $ |  |  |  | $ | 578,553 |  | 
| 
    Accounts receivable, net of
    allowance for doubtful accounts
    
 |  |  | 15,462 |  |  |  | 54,914 |  |  |  |  |  |  |  | 70,376 |  | 
| 
    Inventory, net
    
 |  |  | 34,975 |  |  |  |  |  |  |  | 13,500 | (h) |  |  | 48,475 |  | 
| 
    Related party current assets
    
 |  |  |  |  |  |  | 79,693 |  |  |  |  |  |  |  | 79,693 |  | 
| 
    Due from distributor
    
 |  |  | 54,394 |  |  |  |  |  |  |  |  |  |  |  | 54,394 |  | 
| 
    Prepaid and other current assets
    
 |  |  | 115,809 |  |  |  | 114,653 |  |  |  | (19,100 | )(h)(k) |  |  | 211,362 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total current assets
    
 |  |  | 479,802 |  |  |  | 568,651 |  |  |  | (5,600 | ) |  |  | 1,042,853 |  | 
| 
    Property and equipment, net
    
 |  |  | 795,018 |  |  |  | 814,683 |  |  |  | 138,760 | (i) |  |  | 1,748,461 |  | 
| 
    System under construction
    
 |  |  |  |  |  |  | 138,760 |  |  |  | (138,760 | )(i) |  |  |  |  | 
| 
    FCC license
    
 |  |  | 83,654 |  |  |  | 141,387 |  |  |  | 1,158,613 | (k) |  |  | 1,383,654 |  | 
| 
    Intangible assets, net
    
 |  |  |  |  |  |  | 4,329 |  |  |  | 432,671 | (k) |  |  | 437,000 |  | 
| 
    Goodwill
    
 |  |  |  |  |  |  |  |  |  |  | 4,994,068 | (l) |  |  | 4,994,068 |  | 
| 
    Related party prepaid expenses, net
    of current portion
    
 |  |  |  |  |  |  | 155,388 |  |  |  |  |  |  |  | 155,388 |  | 
| 
    Other long-term assets
    
 |  |  | 147,673 |  |  |  | 119,966 |  |  |  |  |  |  |  | 267,639 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total assets
    
 |  | $ | 1,506,147 |  |  | $ | 1,943,164 |  |  | $ | 6,579,752 |  |  | $ | 10,029,063 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| LIABILITIES AND
    STOCKHOLDERS EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Current liabilities:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Account payable and accrued expenses
    
 |  | $ | 301,060 |  |  | $ | 177,841 |  |  | $ | 45,000 | (j) |  | $ | 523,901 |  | 
| 
    Accrued interest
    
 |  |  | 13,015 |  |  |  | 34,704 |  |  |  |  |  |  |  | 47,719 |  | 
| 
    Current portion of long-term debt
    
 |  |  |  |  |  |  | 14,365 |  |  |  |  |  |  |  | 14,365 |  | 
| 
    Due to related parties
    
 |  |  |  |  |  |  | 48,805 |  |  |  |  |  |  |  | 48,805 |  | 
| 
    Deferred revenue
    
 |  |  | 436,627 |  |  |  | 368,889 |  |  |  |  |  |  |  | 805,516 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total current liabilities
    
 |  |  | 750,702 |  |  |  | 644,604 |  |  |  | 45,000 |  |  |  | 1,440,306 |  | 
| 
    Long-term debt
    
 |  |  | 1,067,339 |  |  |  | 1,478,936 |  |  |  | 45,219 | (e)(k) |  |  | 2,591,494 |  | 
| 
    Deferred revenue, net of current
    portion
    
 |  |  | 74,054 |  |  |  | 223,771 |  |  |  |  |  |  |  | 297,825 |  | 
| 
    Other long-term liabilities
    
 |  |  | 35,962 |  |  |  | 40,829 |  |  |  | 463,445 | (s) |  |  | 540,236 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total liabilities
    
 |  |  | 1,928,057 |  |  |  | 2,388,140 |  |  |  | 553,664 |  |  |  | 4,869,861 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Commitments and contingencies
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Minority interest
    
 |  |  |  |  |  |  | 59,397 |  |  |  |  |  |  |  | 59,397 |  | 
| 
    Stockholders equity:
    
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Series A convertible preferred
    stock, par value $.001; 50,000,000 shares authorized,
    24,808,959 shares issued and outstanding
    
 |  |  |  |  |  |  | 54 |  |  |  | (54 | )(m) |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 25 | (o) |  |  | 25 |  | 
| 
    Common stock, $0.001 par
    value; shares authorized, 2,869,350,403 shares issued and
    outstanding
    
 |  |  | 1,461 |  |  |  | 3,061 |  |  |  | (3,061 | )(m) |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 1,408 | (p) |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 16 | (n) |  |  | 2,885 |  | 
| 
    Accumulated other comprehensive
    income, net of tax
    
 |  |  |  |  |  |  | 3,545 |  |  |  | (3,545 | )(m) |  |  |  |  | 
| 
    Additional paid-in capital
    
 |  |  | 3,555,094 |  |  |  | 3,109,881 |  |  |  | (3,109,881 | )(m) |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | 5,520,266 | (n)(p)(q)(r) |  |  | 9,075,360 |  | 
| 
    Accumulated deficit
    
 |  |  | (3,978,465 | ) |  |  | (3,620,914 | ) |  |  | 3,620,914 | (m) |  |  | (3,978,465 | ) | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total stockholders (deficit)
    equity
    
 |  |  | (421,910 | ) |  |  | (504,373 | ) |  |  | 6,026,087 |  |  |  | 5,099,804 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total liabilities and
    stockholders (deficit) equity
    
 |  | $ | 1,506,147 |  |  | $ | 1,943,164 |  |  | $ | 6,579,752 |  |  | $ | 10,029,063 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
    See Notes to Unaudited Pro Forma Condensed Combined Financial
    Statements
    
    73
 
    Notes to
    Unaudited Pro Forma Condensed Combined Financial
    Statements
 
    |  |  | 
    | Note 1. | Basis of
    Presentation | 
 
    On February 19, 2007, SIRIUS and XM jointly announced the
    execution of the merger agreement. The accompanying unaudited
    pro forma condensed combined financial statements present the
    pro forma consolidated financial position and results of
    operations of the combined company based upon the historical
    financial statements of SIRIUS and XM, after giving effect to
    the XM merger and adjustments described in these footnotes, and
    are intended to reflect the impact of the merger on SIRIUS.
 
    The accompanying unaudited pro forma condensed combined
    financial statements are presented for illustrative purposes
    only and do not give effect to any cost savings, revenue
    synergies or restructuring costs which may result from the
    integration of SIRIUS and XMs operations.
 
    The unaudited pro forma condensed combined balance sheet
    reflects the merger as if it was completed on March 31,
    2007 and includes pro forma adjustments for SIRIUS
    preliminary valuations of certain intangible assets, investment
    in XM Canada and long-term debt acquired. These adjustments are
    subject to further adjustment as additional information becomes
    available and additional analyses are performed. The unaudited
    pro forma condensed combined statements of operations reflect
    the merger as if it had been completed on January 1, 2006.
 
    The pro forma condensed combined balance sheet has been adjusted
    to reflect the preliminary allocation of the purchase price to
    identifiable net assets acquired and the excess purchase price
    to goodwill. The purchase price allocation included within these
    unaudited pro forma condensed combined financial statements is
    based upon a purchase price of approximately $5.6 billion.
    This amount was derived from the estimated number of shares of
    SIRIUS common stock to be issued of approximately
    1.4 billion, based on the outstanding shares of XM common
    stock, preferred stock and restricted stock on March 31,
    2007 and the exchange ratio of 4.6 per each XM share, at a price
    of $3.79 per share, the average closing price of SIRIUS shares
    of common stock for the two days prior to, including and two
    days subsequent to the public announcement of the merger. The
    actual number of newly issued shares of SIRIUS common stock to
    be delivered in connection with the merger will be based upon
    the actual number of XM shares issued and outstanding when the
    merger closes. The purchase price also includes the estimated
    fair value of warrants, restricted stock and stock options to be
    issued as of the closing date of the merger in exchange for
    similar securities of XM. XM options, restricted stock and
    warrants will be exchanged for stock options, restricted stock
    and warrants in SIRIUS and the price per share will be adjusted
    for the 4.6 exchange ratio. Vested stock options, restricted
    stock and warrants issued by SIRIUS in exchange for options,
    restricted stock and warrants held by employees and directors of
    XM are considered part of the purchase price. Accordingly, the
    purchase price includes an estimated fair value of stock
    options, restricted stock and warrants of approximately $183
    million.
 
    The fair value of SIRIUS options that will be issued in exchange
    for XM options was estimated by using the Black-Scholes option
    pricing model with market assumptions. Option pricing models
    require the use of highly subjective market assumptions,
    including expected stock price volatility, which if changed can
    materially affect fair value estimates. The more significant
    assumptions used in estimating the fair value include volatility
    of 46 percent, an expected life of 1-6 years based on
    the age of the original award, and a risk-free interest rate of
    4.54%.
    
    74
 
    The preliminary consideration is as follows:
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  | Additional 
 |  |  |  |  | 
|  |  | Common 
 |  |  | Preferred 
 |  |  | Paid In 
 |  |  |  |  | 
|  |  | Stock |  |  | Stock |  |  | Capital |  |  | Total |  | 
|  |  | (In thousands) |  | 
|  | 
| 
    Total consideration
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Issuance of SIRIUS common stock to
    XM stockholders (1.4 billion shares at $3.79)
    
 |  | $ | 1,408 |  |  | $ |  |  |  | $ | 5,334,833 |  |  | $ | 5,336,241 |  | 
| 
    Issuance of SIRIUS preferred stock
    to XM stockholders (24.8 million shares at $3.79)
    
 |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  | 25 |  | 
| 
    Issuance of SIRIUS common stock to
    XM restricted stockholders (15.8 million shares at $3.79)
    
 |  |  | 16 |  |  |  |  |  |  |  | 59,985 |  |  |  | 60,001 |  | 
| 
    Estimated fair value of
    outstanding XM stock options and restricted stock (See
    Note 2q)
    
 |  |  |  |  |  |  |  |  |  |  | 103,884 |  |  |  | 103,884 |  | 
| 
    Estimated fair value of
    outstanding XM warrants (See Note 2q)
    
 |  |  |  |  |  |  |  |  |  |  | 79,541 |  |  |  | 79,541 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Total consideration
    
 |  | $ | 1,424 |  |  | $ | 25 |  |  | $ | 5,578,243 |  |  | $ | 5,579,692 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
    The table below represents a preliminary allocation of the total
    consideration to SIRIUS tangible and intangible assets and
    liabilities based on managements preliminary estimate of
    their respective fair values as of March 31, 2007.
 
    |  |  |  |  |  | 
|  |  | Total |  | 
|  |  | (In thousands) |  | 
|  | 
| 
    Elimination of XM historical net
    book value
    
 |  | $ | (444,976 | ) | 
| 
    Elimination of XM minority interest
    
 |  |  | (59,397 | ) | 
| 
    Elimination of XM historical FCC
    license
    
 |  |  | (141,387 | ) | 
| 
    Adjustment to fair value FCC
    license
    
 |  |  | 1,300,000 |  | 
| 
    Elimination of XM historical
    intangible asset related to subscriber and advertiser
    relationships and trademarks
    
 |  |  | (4,329 | ) | 
| 
    Adjustment to fair value
    intangible assets related to subscriber and advertiser
    relationships and trademarks
    
 |  |  | 437,000 |  | 
| 
    Adjustment to deferred taxes
    related to increased FCC license carrying value (see
    Note 2s)
    
 |  |  | (463,445 | ) | 
| 
    Estimated transaction costs
    
 |  |  | (45,000 | ) | 
| 
    Residual goodwill created from the
    merger
    
 |  |  | 4,994,068 |  | 
| 
    Unrecognized compensation on
    unvested stock options and restricted stock (See Note 2r)
    
 |  |  | 57,977 |  | 
| 
    Adjustment to fair value long-term
    debt (See Note 2e)
    
 |  |  | (45,219 | ) | 
| 
    Adjustment to fair value
    investment in XM Canada
    
 |  |  | (5,600 | ) | 
|  |  |  |  |  | 
| 
    Total consideration allocated
    
 |  | $ | 5,579,692 |  | 
|  |  |  |  |  | 
 
    For purposes of the preliminary allocation, SIRIUS has estimated
    a fair value for XMs intangible asset related to FCC
    license, subscriber and advertising relationships and trademarks
    based on third-party preliminary valuations.
 
    Upon completion of the fair value assessment after the merger,
    SIRIUS anticipates that the ultimate price allocation will
    differ from the preliminary assessment outlined above. Any
    changes to the initial estimates of the fair value of the assets
    and liabilities will be recorded as adjustments to those assets
    and liabilities and residual amounts will be allocated to
    goodwill.
    
    75
 
    |  |  | 
    | Note 2. | Pro Forma
    Adjustments | 
 
    a. reclassify XMs activation revenue which was
    reported in XMs other revenue to subscriber revenue to
    conform to SIRIUS presentation.
 
    b. reclassify XMs broadcast expense included in
    broadcast and operation expenses to satellite and transmission
    and reclassify XMs operation expense included in broadcast
    and operation expense to general and administrative expenses to
    conform to SIRIUS presentation.
 
    c. reclassify (i) ad sales expense and
    (ii) advertising and marketing and retention and support
    included in marketing to sales and marketing to conform to
    SIRIUS presentation.
 
    d. reclassify subsidies and distribution included in
    marketing to subscriber acquisition costs to conform to SIRIUS
    presentation.
 
    e. reflects the adjustment to lower interest expense due to
    the adjustment of XMs long-term debt to fair value at the
    time of the merger. (See Note 1). The difference between
    the fair value and the face amount of each borrowing is
    amortized on a straight-line basis as a reduction to interest
    expense over the remaining term of the borrowing, based on the
    maturity date.
 
    f. adjustment to reflect the additional amortization
    expense due to the adjustment of certain XMs intangible
    assets to fair value at the time of the merger (See
    Note 1). Pro Forma amortization expense for the twelve
    months ended December 31, 2006 and three months ended
    March 31, 2007 of $128 million and $32 million,
    respectively, was recorded utilizing the straight-line method of
    amortization for the following intangible assets:
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  | Pro Forma 
 |  | 
|  |  |  |  |  |  |  |  | Pro Forma 
 |  |  | Amortization 
 |  | 
|  |  |  |  |  |  |  |  | Amortization 
 |  |  | Expense for 
 |  | 
|  |  | Fair Value at 
 |  |  | Estimated Useful 
 |  |  | Expense for 
 |  |  | December 31, 
 |  | 
|  |  | Acquisition |  |  | Lives (Years) |  |  | March 31, 2007 |  |  | 2006 |  | 
|  |  |  |  |  | (In thousands) |  |  |  |  | 
|  | 
| 
    Subscriber relationships
    
 |  | $ | 350,000 |  |  |  | 3 |  |  | $ | 29,167 |  |  | $ | 116,667 |  | 
| 
    Advertiser relationships
    
 |  |  | 7,000 |  |  |  | 7 |  |  |  | 250 |  |  |  | 1,000 |  | 
| 
    Trademarks
    
 |  |  | 80,000 |  |  |  | 8 |  |  |  | 2,500 |  |  |  | 10,000 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 
    Pro forma amortization expense
    
 |  |  |  |  |  |  |  |  |  | $ | 31,917 |  |  | $ | 127,667 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
    g. reclassify XMs customer loyalty payments from
    subscriber acquisition costs to sales and marketing expenses to
    conform to SIRIUS presentation.
 
    h. reflects the estimated reclassification of XMs net
    inventory included in prepaid and other current assets to
    inventory to conform to SIRIUS presentation.
 
    i. reflects the estimated reclassification of XMs
    system under construction costs to property and equipment to
    conform to SIRIUS presentation.
 
    j. reflects the adjustment to record as liabilities the
    estimated transaction cost to be incurred by SIRIUS. Included in
    the pro forma adjustment is SIRIUS estimated investment
    banking, attorney and independent accountant fees, and other
    transaction-related costs.
 
    k. reflects a preliminary allocation of the purchase price
    to XMs FCC License, certain long-lived intangible assets,
    investment in XM Canada and long-term debt. The remaining
    unallocated purchase price was allocated to Goodwill (See
    Note 1).
 
    The final purchase price allocations, which are based on
    preliminary third-party appraisals, may result in different
    allocations for tangible and intangible assets than presented in
    the unaudited pro forma condensed combined financial statements,
    and those differences could be material.
 
    l. residual goodwill created from the merger (See
    Note 1).
 
    m. eliminate the historical stockholders deficit
    accounts of XM at March 31, 2007.
    
    76
 
    n. reflect the issuance of 4.6 shares of SIRIUS common
    stock for each share of XM restricted shares outstanding as
    follows (in thousands except for share data):
 
    |  |  |  |  |  | 
| 
    XM restricted shares outstanding
    at March 31, 2007
    
 |  |  | 3,441,608 |  | 
| 
    Exchange ratio
    
 |  |  | 4.6 |  | 
| 
    SIRIUS common shares to be issued
    
 |  |  | 15,831,397 |  | 
| 
    Price per share
    
 |  | $ | 3.79 |  | 
| 
    Aggregate value of SIRIUS
    consideration
    
 |  | $ | 60,001 |  | 
| 
    Value attributed to par at
    $.001 par value
    
 |  | $ | 16 |  | 
| 
    Balance to capital in excess of
    par value
    
 |  | $ | 59,985 |  | 
 
    o. reflect the issuance of 4.6 shares of SIRIUS
    preferred stock for each share of XM preferred stock outstanding
    as follows (in thousands except for share data):
 
    |  |  |  |  |  | 
| 
    XM preferred shares outstanding at
    March 31, 2007
    
 |  |  | 5,393,252 |  | 
| 
    Exchange ratio
    
 |  |  | 4.6 |  | 
| 
    SIRIUS preferred shares to be
    issued
    
 |  |  | 24,808,959 |  | 
| 
    Value attributed to par at
    $.001 par value
    
 |  | $ | 25 |  | 
 
    p. reflect the issuance of 4.6 shares of SIRIUS common
    stock for each share of XM common stock outstanding as follows
    (in thousands except for share data):
 
    |  |  |  |  |  | 
| 
    XM common shares outstanding at
    March 31, 2007
    
 |  |  | 306,082,407 |  | 
| 
    Exchange ratio
    
 |  |  | 4.6 |  | 
| 
    SIRIUS common shares to be issued
    
 |  |  | 1,407,979,072 |  | 
| 
    Price per share
    
 |  | $ | 3.79 |  | 
| 
    Aggregate value of SIRIUS
    consideration
    
 |  | $ | 5,336,241 |  | 
| 
    Value attributed to par at
    $.001 par value
    
 |  | $ | 1,408 |  | 
| 
    Balance to capital in excess of
    par value
    
 |  | $ | 5,334,833 |  | 
 
    q. reflect the fair value of XMs employees
    stock options, warrants and restricted stock. The fair value of
    XMs options to be exchanged for SIRIUS options was
    estimated using a Black Scholes pricing model. Option pricing
    models require the use of highly subjective assumptions
    including expected stock price and volatility, that when
    changed, can materially affect fair value estimates. The more
    significant assumptions used in estimating the fair value
    include volatility of 46 percent an expected life of
    1-6 years based on the age of the original award, and a
    risk-free interest rate of 4.54%.
 
    r. reflect the revaluation of XMs unvested stock
    options and restricted stock as of March 31, 2007. The
    original valuation of these awards were determined by XM at the
    original grant dates. Upon completion of the merger, these
    awards will be revalued using current market assumptions. The
    fair value of these awards approximates $58 million at
    March 31, 2007. Annual compensation expense related to
    these awards is expected to approximate the historic
    compensation expense. Total compensation expense for these
    awards for the period ended March 31, 2007 was
    approximately $14 million. For unvested stock options, the
    average remaining vesting period is 1.64 years and the
    average remaining contractual life is 6.46 years. For
    unvested restricted stock awards, the average remaining vesting
    period is 2.12 years. Pursuant to FAS 123(R), unvested
    awards are not considered a component of purchase price and are
    solely recognized in compensation expense in future periods.
    $58 million is a reduction of additional paid-in capital.
 
    s. reflects the adjustment to record the deferred tax
    liability for the incremental fair value adjustment of the FCC
    license included as a pro forma adjustment in the balance sheet
    calculated as follows (in thousands):
 
    |  |  |  |  |  | 
| 
    Net adjustment to fair value FCC
    license
    
 |  | $ | 1,158,613 |  | 
| 
    Combined federal and state rate
    
 |  |  | 40 | % | 
|  |  |  |  |  | 
| 
    Deferred tax liability
    
 |  | $ | 463,445 |  | 
|  |  |  |  |  | 
    
    77
 
 
    DESCRIPTION
    OF SIRIUS CAPITAL STOCK
 
    We have summarized below the material terms of SIRIUS
    capital stock that will be in effect if the merger is completed.
    The following description of the material terms of the capital
    stock of SIRIUS does not purport to be complete and is qualified
    in its entirety by reference to the certificate of incorporation
    and bylaws of SIRIUS, which documents are incorporated by
    reference as exhibits to the registration statement of which
    this Proxy Statement is a part, the applicable provisions of the
    Delaware General Corporate Law and the Amendment to the
    certificate of incorporation of SIRIUS attached as Annex D
    to this Proxy Statement. All references within this section to
    common stock mean the common stock of SIRIUS unless otherwise
    noted.
 
    Authorized
    Capital Stock of SIRIUS
 
    The SIRIUS amended certificate of incorporation, which will be
    in effect if the merger is completed, provide that the total
    number of shares of capital stock which may be issued by SIRIUS
    is          ,
    and the designation, the number of authorized shares and the par
    value of the shares of each class or series will be as follows:
 
    |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | No. of Shares 
 |  |  |  |  | 
| 
    Designation
 |  | Class |  |  | Authorized |  |  | Par Value |  | 
|  | 
| 
    Common Stock
    
 |  |  | Common |  |  |  |  |  |  | $ | 0.001 |  | 
| 
    Preferred Stock
    
 |  |  | Preferred |  |  |  | 50,000,000 |  |  | $ | 0.001 |  | 
 
    Description
    of SIRIUS Common Stock
 
    Voting
    Rights
 
    General
 
    Except as otherwise provided by law, as set forth in the SIRIUS
    amended certificate of incorporation or as otherwise provided by
    any outstanding series of preferred stock, the holders of common
    stock will have general voting power on all matters as a single
    class.
 
    Votes Per
    Share
 
    On each matter to be voted on by the holders of common stock,
    each outstanding share of common stock will be entitled to one
    vote per share.
 
    Cumulative
    Voting
 
    Stockholders of SIRIUS are not entitled to cumulative voting of
    their shares in elections of directors.
 
    Liquidation
    Rights
 
    In the event of the voluntary or involuntary liquidation,
    dissolution or winding up of SIRIUS, the prior rights of
    creditors and the aggregate liquidation preference of any
    preferred stock then outstanding must first be satisfied. The
    holders of common stock will be entitled to share in the
    remaining assets of SIRIUS on a pro rata basis.
 
    Dividends
 
    Shares of common stock are entitled to participate equally in
    dividends when and as dividends may be declared by the SIRIUS
    board of directors out of funds legally available.
 
    Preemptive
    Rights
 
    No holder of shares of any class or series of capital stock of
    SIRIUS or holder of any security or obligation convertible into
    shares of any class or series of capital stock of SIRIUS will
    have any preemptive right to subscribe for, purchase or
    otherwise acquire shares of any class or series of capital stock
    of SIRIUS.
    
    78
 
    Transfer
    Agent and Registrar
 
    The transfer agent and registrar for the common stock is The
    Bank of New York.
 
    Anti-takeover
    Provisions
 
    The Delaware General Corporation Law, which we refer to as the
    DGCL, and the SIRIUS amended certificate of incorporation and
    bylaws contain provisions which could discourage or make more
    difficult a change in control of the company without the support
    of the board of directors. A summary of these provisions follows.
 
    Notice
    Provisions Relating to Stockholder Proposals and
    Nominees
 
    SIRIUS bylaws contain provisions requiring stockholders to
    give advance written notice to the company of a proposal or
    director nomination in order to have the proposal or the nominee
    considered at an annual meeting of stockholders. The notice must
    usually be given not less than 70 days and not more than
    90 days before the first anniversary of the preceding
    years annual meeting. Under the amended and restated
    bylaws, a special meeting of stockholders may be called only by
    the Secretary or any other officer, whenever directed by not
    less than two members of the board of directors or by the CEO.
 
    Business
    Combinations
 
    SIRIUS is a Delaware corporation which is subject to
    Section 203 of the General Corporation Law of the State of
    Delaware. Section 203 provides that, subject to certain
    exceptions specified in the law, a Delaware corporation shall
    not engage in certain business combinations with any
    interested stockholder for a three-year period
    following the time that the stockholder became an interested
    stockholder unless:
 
    |  |  |  | 
    |  |  | prior to such time, SIRIUS board of directors approved
    either the business combination or the transaction that resulted
    in the stockholder becoming an interested stockholder; | 
|  | 
    |  |  | upon consummation of the transaction that resulted in the
    stockholder becoming an interested stockholder, the interested
    stockholder owned at least 85% of the voting stock outstanding
    at the time the transaction commenced, excluding certain
    shares; or | 
|  | 
    |  |  | at or subsequent to that time, the business combination is
    approved by SIRIUS board of directors and by the
    affirmative vote of holders of at least
    662/3%
    of the outstanding voting stock that is not owned by the
    interested stockholder. | 
 
    Generally, a business combination includes a merger,
    asset or stock sale or other transaction resulting in a
    financial benefit to the interested stockholder. Subject to
    certain exceptions, an interested stockholder is a
    person who, together with that persons affiliates and
    associates, owns, or within the previous three years did own,
    15% or more of SIRIUS voting stock.
 
    Under certain circumstances, Section 203 makes it more
    difficult for a person who would be an interested
    stockholder to effect various business combinations with a
    corporation for a three year period. The provisions of
    Section 203 may encourage companies interested in acquiring
    SIRIUS to negotiate in advance with its board of directors
    because the stockholder approval requirement would be avoided if
    SIRIUS board of directors approves either the business
    combination or the transaction that results in the stockholder
    becoming an interested stockholder. These provisions also may
    make it more difficult to accomplish transactions that
    stockholders may otherwise deem to be in their best interests.
 
    No
    Stockholder Rights Plan
 
    SIRIUS currently does not have a stockholder rights plan.
 
    Description
    of SIRIUS Preferred Stock
 
    We have summarized below the material terms of SIRIUS
    preferred stock.
    
    79
 
    General
    Provisions Relating to Preferred Stock
 
    The preferred stock may be issued from time to time in one or
    more series, each of which is to have the voting powers,
    designation, preferences and relative, participating, optional
    or other special rights and qualifications, limitations or
    restrictions thereof as are stated and expressed in the SIRIUS
    amended certificate of incorporation, or in a resolution or
    resolutions providing for the issue of that series adopted by
    the board of directors.
 
    The board of directors has the authority to create one or more
    series of preferred stock and, with respect to each series, to
    fix or alter as permitted by law:
 
    |  |  |  | 
    |  |  | the number of shares and the distinctive designation of the
    series; | 
|  | 
    |  |  | the voting power, if any; and | 
|  | 
    |  |  | any other terms, conditions, special rights and protective
    provisions. | 
 
    Series A
    Convertible Preferred Stock
 
    Designation
    and Conversion
 
    In connection with the merger, SIRIUS will establish a new
    series of preferred stock, which will be designated
    Series A convertible preferred stock. There are
    currently outstanding 5,393,252 shares of XM Series A
    convertible preferred stock. Each share of XM Series A
    convertible preferred stock outstanding immediately before the
    merger will be converted into the right to receive
    4.6 shares of the newly designated SIRIUS Series A
    convertible preferred stock, which has substantially the same
    powers, designations, preferences, rights and qualifications.
 
    Each holder of Series A convertible preferred stock may
    convert any whole number or all of such holders shares of
    Series A convertible preferred stock into shares of common
    stock at the rate of one share of common stock for each share of
    Series A convertible preferred stock. Following a
    recapitalization, each share of Series A convertible
    preferred stock shall be convertible into the kind and number of
    shares of stock or other securities or property of SIRIUS or
    otherwise to which the holder of such share of Series A
    convertible preferred stock would have been entitled to receive
    if such holder had converted such share into common stock
    immediately prior to such recapitalization. Adjustments to the
    conversion rate shall similarly apply to each successive
    recapitalization.
 
    Voting
    and Other Rights
 
    Except as set forth below, holders of Series A convertible
    preferred stock are entitled to vote, together with the holders
    of the shares of SIRIUS common stock (and any other class or
    series that may similarly be entitled to vote with the shares of
    SIRIUS common stock) as a single class, upon all matters upon
    which holders of Sirius common stock are entitled to vote, with
    each share of Series A convertible preferred stock entitled
    to 1/5th of one vote on such matters. Moreover, so long as
    any shares of the Series A convertible preferred stock are
    outstanding, SIRIUS cannot, without first obtaining the approval
    by vote or written consent, in the manner provided by law, of a
    majority of the total number of shares of the Series A
    convertible preferred stock at the time outstanding, voting
    separately as a class, either (a) alter or change any or
    all of the rights, preferences, privileges and restrictions
    granted to or imposed upon the Series A convertible
    preferred stock, or (b) increase or decrease the authorized
    number of shares of Series A convertible preferred stock.
 
    Dividends
 
    The holders of Series A convertible preferred stock receive
    dividends and distributions of SIRIUS ratably with the holders
    of shares of common stock.
 
    Liquidation,
    Dissolution, Winding Up or Insolvency
 
    In the event of any liquidation, dissolution, winding up or
    insolvency of SIRIUS, the holders of Series A convertible
    preferred stock are entitled to be paid first out of the assets
    of SIRIUS available for distribution to holders of capital stock
    of all classes (whether such assets are capital, surplus or
    earnings), an amount equal to
    
    80
 
    $9.5248159 per share of Series A convertible preferred
    stock, together with the amount of any accrued or capitalized
    dividends:
 
    |  |  |  | 
    |  |  | before any distribution or payment is made to any common
    stockholders or holders of any other class or series of capital
    stock of SIRIUS designated to be junior to the Series A
    convertible preferred stock; and | 
|  | 
    |  |  | subject to the liquidation rights and preferences of any class
    or series of preferred stock designated in the future to be
    senior to, or on a parity with, the Series A convertible
    preferred stock with respect to liquidation preferences. | 
 
    After payment in full of the liquidation preference to the
    holders of Series A convertible preferred stock, holders of
    the Series A convertible preferred stock have no right or
    claim to any of the remaining available assets.
    
    81
 
 
    COMPARISON
    OF RIGHTS OF STOCKHOLDERS OF SIRIUS AND XM
 
    XM and SIRIUS are Delaware corporations and are governed by the
    DGCL. The combined company will continue to be a Delaware
    corporation following the merger and will be governed by the
    DGCL.
 
    Upon completion of the merger, XMs stockholders will
    become SIRIUS stockholders. As a condition to the merger,
    SIRIUS current certificate of incorporation will be
    amended immediately before the time of completion of the merger
    by the certificate of amendment in the form attached as
    Annex D to this Proxy Statement. The rights of the former
    XM stockholders and the SIRIUS stockholders will therefore be
    governed by the DGCL and the certificate of incorporation, as
    amended, and bylaws of SIRIUS.
 
    The following description summarizes the material differences
    that may affect the rights of the stockholders of SIRIUS and XM,
    but is not a complete statement of all those differences, or a
    complete description of the specific provisions referred to in
    this summary. Stockholders should read carefully the relevant
    provisions of the DGCL and the respective certificates of
    incorporation and bylaws of SIRIUS and XM. For more information
    on how to obtain the documents that are not attached to this
    Proxy Statement, see Where You Can Find More
    Information beginning on page 91.
 
    Capitalization
 
    SIRIUS
 
    The total number of shares of all classes of capital stock
    authorized under SIRIUS certificate of incorporation is
    2.55 billion, which is divided into:
 
    |  |  |  | 
    |  |  | 2.50 billion shares of common stock, par value $0.001 per
    share; and | 
|  | 
    |  |  | 50 million shares of preferred stock, par value $0.001 per
    share. | 
 
    At the special meeting, SIRIUS stockholders will be asked to
    approve the Charter Amendment to increase the number of
    authorized shares of SIRIUS common stock to .
 
    XM
 
    The total number of shares of all classes of capital stock
    authorized under XMs certificate of incorporation is
    675 million shares, which is divided into:
 
    |  |  |  | 
    |  |  | 600 million shares of class A common stock, par value
    $0.01 per share; | 
|  | 
    |  |  | 15 million shares of class C common stock, par value
    $0.01 per share; | 
|  | 
    |  |  | 15 million shares of Series A convertible preferred
    stock, par value $0.01 per share; | 
|  | 
    |  |  | 3 million shares of 8.25% Series B convertible
    redeemable preferred stock, par value $0.01 per share; | 
|  | 
    |  |  | 250,000 shares of 8.25% Series C convertible
    redeemable preferred stock, par value $0.01 per share; and | 
|  | 
    |  |  | 250,000 shares of Series D junior participating
    preferred stock, par value $0.01 per share. | 
 
    An additional 41,500,000 shares of preferred stock, par
    value $0.01 per share, are available for future issuance in one
    or more series to be designated by the XM board of directors.
 
    Voting
    Rights
 
    SIRIUS
 
    The holders of SIRIUS common stock are entitled to vote one vote
    per share on all matters to be voted on by stockholders.
 
    SIRIUS Series A convertible preferred stock, the newly
    designated series of SIRIUS preferred stock into which shares of
    XM Series A convertible preferred stock will be converted
    in the merger, will have the same powers, designations,
    preferences, rights and qualifications, limitations and
    restrictions as the XM Series A convertible
    
    82
 
    preferred stock to the fullest extent practicable, except that
    such preferred stock will have the right to vote with the
    holders of the SIRIUS common stock as a single class, with each
    share of preferred stock having 1/5th of a vote.
 
    XM
 
    The holders of XM common stock are entitled to one vote per
    share on all matters to be voted on by the stockholders.
 
    The holders of XM Series A convertible preferred stock are
    not entitled to vote on any matter voted upon by stockholders,
    except as otherwise required under the DGCL, provided, however,
    the majority of the outstanding shares must approve, voting
    separately as a class:
 
    |  |  |  | 
    |  |  | any change to the rights, preferences, privileges and
    restrictions granted to the XM Series A convertible
    preferred stock; and | 
|  | 
    |  |  | the increase or decrease of authorized shares of XM
    Series A convertible preferred stock. | 
 
    Stockholder
    Action By Written Consent
 
    Delaware
    Corporation Law
 
    The DGCL allows action to be taken by stockholders by written
    consent to be made by the holders of the minimum number of votes
    that would be needed to approve a matter at an annual or special
    meeting of stockholders, unless this right to act by written
    consent is denied in the certificate of incorporation.
 
    SIRIUS
 
    SIRIUS certificate of incorporation does not limit the
    right of SIRIUS stockholders to take action by written
    consent without an annual or special meeting of stockholders.
 
    XM
 
    XMs bylaws permit any action to be taken without a
    meeting, without prior notice and without a vote, as long as
    (i) it is required or permitted to be taken at any annual
    or special meeting of the stockholders, and (ii) a consent
    in writing, setting forth the action so taken, is signed by
    stockholders holding all outstanding stock and delivered to XM.
 
    Dividends
 
    The DGCL permits a corporation to declare and pay dividends out
    of surplus or, if there is no surplus,
    out of its net profits for the fiscal year in which the dividend
    is declared
    and/or the
    preceding fiscal year. Surplus is defined as the
    excess of the net assets of the corporation over the amount
    determined to be the capital of the corporation by the board of
    directors. The capital of the corporation cannot be less than
    the aggregate par value of all issued shares of capital stock.
    Net assets equals total assets minus total liabilities. The DGCL
    also provides that dividends may not be paid out of net profits
    if, after the payment of the dividend, capital is less than the
    capital represented by the outstanding stock of all classes
    having a preference upon the distribution of assets.
 
    Number,
    Election, Vacancy and Removal of Directors
 
    Delaware
    Corporation Law
 
    Under the DGCL, a majority of the directors in office can fill
    any vacancy or newly created directorship. A director may be
    removed with or without cause by a majority of the shares
    entitled to vote at an election of the directors.
 
    SIRIUS
 
    The number of directors may not be less than three nor more than
    15 as determined from time to time by the affirmative vote of a
    majority of the board of directors at any meeting at which there
    is a quorum. Generally,
    
    83
 
    directors are elected by the holders of a plurality of the
    voting power present in person or represented by proxy and
    entitled to vote at the annual meeting. Any vacancy on the board
    of directors (whether resulting from an increase in the total
    number of directors, the departure of one of the directors) may
    be filled by the affirmative vote of a majority of the directors
    then in office or by a sole remaining director. Each director is
    elected annually. The holders of all classes and series of stock
    are entitled to vote in the election of directors with the
    number of votes specified above. SIRIUS stockholders are not
    entitled to cumulative voting rights in the election of
    directors. For a discussion of the governance structure after
    the merger, see The Merger Agreement 
    Governance Matters on page 59.
 
    XM
 
    Subject to the provisions of certain director designation
    agreements, the number of directors shall be between three and
    fifteen as determined from time to time by the board of
    directors. Subject to certain exceptions, directors shall be
    elected at the annual meeting of the stockholders. Unless
    otherwise provided for by the director designation agreements,
    vacancies and newly created directorships resulting from death,
    resignation, removal and from any increase in the authorized
    number of directors or otherwise may be filled by the
    affirmative vote of a majority of the directors then in office,
    although fewer than a quorum, or by a sole remaining director.
    Each director shall hold office until the next annual meeting of
    XM stockholders, and until such directors successor is
    elected and qualified, or until the directors earlier
    death, resignation or removal. Except as subject to the rights,
    if any, of the holders of preferred stock, any director may be
    removed from office at any time by the affirmative vote of the
    holders of at least a majority in voting power of the issued and
    outstanding capital stock of XM entitled to vote in the election
    of directors.
 
    Amendments
    to Certificate of Incorporation
 
    Under the DGCL, an amendment to the articles or certificate of
    incorporation requires approval by both the board of directors
    and a majority of the votes entitled to be cast. Any proposed
    amendment to the certificate of incorporation that would
    increase or decrease the authorized shares of a class of stock,
    increase or decrease the par value of the shares of a class of
    stock, or alter or change the powers, preferences or special
    rights of the shares of a class of stock (so as to affect them
    adversely) requires approval of the holders of a majority of the
    outstanding shares of the affected class, voting as a separate
    class, in addition to the approval of a majority of the shares
    entitled to vote on that proposed amendment. If any proposed
    amendment would alter or change the powers, preferences or
    special rights of any series of a class of stock so as to affect
    them adversely, but does not affect the entire class, then only
    the shares of the series affected by the proposed amendment is
    considered a separate class for purposes of the immediately
    preceding sentence.
 
    Neither the SIRIUS or XM certificate of incorporation contain
    any special provisions regarding approval of amendments to the
    certificate of incorporation.
 
    Amendments
    to Bylaws
 
    SIRIUS
 
    The bylaws may be amended or repealed by the board of directors
    or the stockholders. However, the affirmative holders of at
    least 80 percent in voting power of all shares of the
    corporation entitled to vote generally in the election of
    directors, voting together as a single class, are required in
    order for the stockholders to amend, repeal or modify
    Section 2 (Special Meetings) and
    Section 11 (Nominations, etc.) of
    Article 1 or this sentence.
 
    XM
 
    XMs bylaws may be amended or repealed, or new bylaws may
    be adopted, by the board of directors or stockholders, but
    notice of such amendment, repeal or adoption must be contained
    in the notice of such stockholder or board of directors meeting,
    as the case may be. All such amendments must be approved by
    either the holders of a majority of the outstanding capital
    stock entitled to vote or by a majority of the entire board of
    directors then in office.
    
    84
 
 
    Notice of
    Certain Stockholder Actions
 
    SIRIUS
 
    SIRIUS bylaws state that a stockholder may only nominate
    directors for election or present an action to be taken at an
    annual stockholders meeting if the stockholder gives
    advance notice not less than 70 days and not more than
    90 days before the first anniversary of the preceding
    years annual meeting; provided, however, that in the event
    that the date of the annual meeting is advanced by more than
    20 days, or delayed by more than 70 days, from such
    anniversary date, notice by the stockholder to be timely must be
    so delivered not earlier than the 90th day prior to such
    annual meeting and not later than the close of business on the
    later of the 70th day prior to such annual meeting or the
    tenth day following the day on which public announcement of the
    date of such meeting is first made. Notwithstanding anything in
    the previous sentence to the contrary, in the event that the
    number of directors to be elected to the board of directors of
    the corporation is increased and there is no public announcement
    naming all of the nominees for director or specifying the size
    of the increased board of directors made by the corporation at
    least eighty days prior to the first anniversary of the
    preceding years annual meeting, a stockholders
    notice required by this bylaw shall also be considered timely,
    but only with respect to nominees for any new positions created
    by such increase, if it shall be delivered to the corporate
    secretary at the principal executive offices of the corporation
    not later than the close of business on the tenth day following
    the day on which such public announcement is first made by the
    corporation.
 
    XM
 
    XMs bylaws state that a stockholder may only nominate
    directors for election or present an action to be taken at an
    annual stockholders meeting if the stockholder gives
    advance written notice not less than 90 and not more than
    120 days before the first anniversary of the preceding
    years annual meeting; provided, however, that in the event
    that the annual meeting is called for a date not within
    30 days before or after the anniversary of the preceding
    years annual meeting, notice by the stockholder to be
    timely must be so received not later than the close of business
    on the 10th day following the day on which such notice of
    the annual meeting was mailed or such public disclosure was
    made, whichever first occurs.
 
    Special
    Stockholder Meetings
 
    Delaware
    Corporation Law
 
    Under the DGCL, a special meeting of a corporations
    stockholders may be called by the board or by any other person
    authorized by the corporations articles or certificate of
    incorporation or bylaws. All stockholders of record entitled to
    vote must receive notice of all stockholder meetings not less
    than 10 nor more than 60 days before the date of the
    stockholder meeting.
 
    SIRIUS
 
    A special meeting of the stockholders, as required by law or as
    provided in SIRIUS bylaws, may be called at any time by
    the Secretary or any other officer, whenever directed by at
    least two members of the board of directors or the Chief
    Executive Officer.
 
    XM
 
    Special meetings of the stockholders, for any purpose or
    purposes, unless otherwise provided by statute, may be called by
    the Chairman, the Chief Executive Officer, the President or the
    Secretary, and shall be called by any such officer at the
    request of the board of directors, a committee of the board of
    directors authorized to do so or by stockholders holding at
    least a majority of the outstanding capital stock that is
    entitled to vote.
    
    85
 
 
    Limitation
    of Personal Liability of Directors and Indemnification
 
    SIRIUS
 
    SIRIUS certificate of incorporation provide that no SIRIUS
    director shall be personally liable to SIRIUS or its
    stockholders for monetary damages for breach of fiduciary duty
    by that director as a director. However, this limitation does
    not eliminate or limit the liability of a director to the extent
    provided by applicable law (i) for any breach of the
    directors duty of loyalty to SIRIUS or its stockholders,
    (ii) for acts or omissions not in good faith or which
    involve intentional misconduct or a knowing violation of law,
    (iii) for violation of the DGCL regarding unlawful payment
    of dividends or unlawful stock purchases or redemptions, or
    (iv) for any transaction from which the director derived an
    improper personal benefit.
 
    SIRIUS indemnifies, to the full extent permitted by law, any
    person (or the estate of any person) who was or is a party to,
    or is threatened to be made a party to, any threatened, pending
    or complete action, suit or proceeding, and whether civil,
    criminal, administrative, investigative or otherwise, by reason
    of the fact that such person is or was a director, officer or
    employee of SIRIUS, or is or was serving at the request of
    SIRIUS as a director, officer or employee of another
    corporation, limited liability company, partnership, joint
    venture, trust or other enterprise. SIRIUS may, to the full
    extent permitted by law, purchase and maintain insurance on
    behalf of any such person against any liability which may be
    asserted against him or her. To the full extent permitted by
    law, the indemnification includes expenses (including
    attorneys fees), judgments, fines and amounts paid in
    settlement, and any such expenses may be paid by SIRIUS in
    advance of the final disposition of such action, suit or
    proceeding. The indemnification does not limit SIRIUS
    right to indemnify any other person for any such expenses to the
    full extent permitted by law, nor is it exclusive of any other
    rights to which any person seeking indemnification from SIRIUS
    may be entitled under any agreement, vote of stockholders or
    disinterested directors or otherwise, both as to action in his
    or her official capacity and as to action in another capacity
    while holding such office.
 
    XM
 
    XMs certificate of incorporation provides that no XM
    director will be personally liable to XM or its stockholders for
    monetary damages for breach of fiduciary duty as a director.
    However, this limitation does not eliminate or limit the
    liability of a director to the extent provided by applicable law
    (i) for any breach of the directors duty of loyalty
    to XM or its stockholders, (ii) for acts or omissions not
    in good faith or which involve intentional misconduct or a
    knowing violation of law, (iii) for violation of the DGCL
    regarding unlawful payment of dividends or unlawful stock
    purchases or redemptions, or (iv) for any transaction from
    which the director derived an improper personal benefit.
 
    XMs certificate of incorporation and its by-laws further
    provides XM shall indemnify, to the full extent authorized by
    Delaware law, any person who was or is a party or is threatened
    to be made a party to any threatened, pending or completed
    action, suit or proceeding, whether civil, criminal,
    administrative or investigative, and whether or not such action
    is by or in the right of XM, by reason of the fact that he is or
    was a director or officer of XM, or by reason of the fact that
    such director or officer is or was serving at the request of XM
    as a director, officer, employee or agent of another
    corporation, partnership, joint venture, trust or other
    enterprise, domestic or foreign, against expenses (including
    attorneys fees) judgments, fines and amounts paid in
    settlement actually and reasonably incurred by him in connection
    with such action, suit or proceeding if such person acted in
    good faith and in a manner such person reasonably believed to be
    in or not opposed to the best interests of XM, and shall advance
    expenses incurred by any such officer or director in defending
    any such action, suit or proceeding to the full extent
    authorized by Delaware law. The previous sentence does not
    affect any rights to indemnification to which employees other
    than directors and officers may be entitled by law.
 
    For purposes of indemnification by XM, a person shall be deemed
    to have acted in good faith and in a manner such person
    reasonably believed to be in or not opposed to the best interest
    of XM, or, with respect to any criminal action or proceeding, to
    have had no reasonable cause to believe such persons
    conduct was unlawful, if such persons action is based on
    the records or books of account of XM or another enterprise, or
    on information supplied to such person by XMs officers or
    the officers of another enterprise in the course of their
    duties, or on the advice of legal counsel for XM or another
    enterprise or on information or records given or reports made to
    XM or another
    
    86
 
    enterprise by an independent public accountant or by an
    appraiser or other expert selected with reasonable care by XM or
    another enterprise.
 
    Mergers,
    Consolidations and Other Transactions
 
    Under the DGCL, the board of directors and the holders of a
    majority of the shares entitled to vote must approve a merger,
    consolidation or sale of all or substantially all of a
    corporations assets. However, unless the corporation
    provides otherwise in its articles or certificate of
    incorporation, no stockholder vote of a constituent corporation
    surviving a merger is required if:
 
    |  |  |  | 
    |  |  | the merger agreement does not amend the constituent
    corporations articles or certificate of incorporation; | 
|  | 
    |  |  | each share of stock of the constituent corporation outstanding
    before the merger is an identical outstanding or treasury share
    of the surviving corporation after the merger; and | 
|  | 
    |  |  | either no shares of common stock of the surviving corporation
    and no shares, securities or obligations convertible into such
    stock are to be issued or delivered under the plan of merger, or
    the authorized unissued shares or the treasury shares of common
    stock of the surviving corporation to be issued or delivered
    under the plan of merger plus those initially issuable upon
    conversion of any other shares, securities or obligations to be
    issued or delivered under such plan do not exceed 20% of the
    shares of common stock of such constituent corporation
    outstanding immediately prior to the effective date of the
    merger. | 
 
    Neither the SIRIUS nor XM certificate of incorporation contains
    any super-majority voting requirements governing mergers,
    consolidations, sales of substantially all of the assets,
    liquidations, reclassifications or recapitalizations.
 
    State
    Anti-takeover Statutes
 
    Both XM and SIRIUS are subject to Section 203 of the DGCL,
    which under certain circumstances may make it more difficult for
    a person who would be an Interested Stockholder
    (defined generally as a person with 15% or more of a
    corporations outstanding voting stock) to effect a
    Business Combination (defined generally as mergers,
    consolidations and certain other transactions, including sales,
    leases or other dispositions of assets with an aggregate market
    value equal to 10% or more of the aggregate market value of the
    corporation) with the corporation for a three-year period. Under
    Section 203, a corporation may under certain circumstances
    avoid the restrictions imposed by Section 203. Moreover, a
    corporations certificate of incorporation or bylaws may
    exclude a corporation from the restrictions imposed by
    Section 203. Neither the XM or SIRIUS certificate of
    incorporation or bylaws exclude the companies from the
    restrictions imposed under Section 203.
 
    Appraisal
    Rights
 
    Neither SIRIUS nor XM common stockholders have appraisal rights
    in the merger. However, the holder of XM Series A
    convertible preferred stock will have the right to seek
    appraisal of the fair value of its shares, under
    Section 262 of the DGCL.
 
    Stockholder
    Rights Plan
 
    SIRIUS
 
    SIRIUS does not have a stockholder rights plan in place as of
    the date of this Proxy Statement.
 
    XM
 
    In August 2002, XM adopted a shareholders Rights Plan
    (commonly known as a poison pill) in which preferred
    stock purchase rights were granted as a dividend at the rate of
    one right for each share of common stock held of record as of
    the close of business on August 15, 2002. The rights would
    be exercisable only upon the occurrence of certain events
    relating to an unsolicited take-over or change of control of XM.
    
    87
 
    On February 19, 2007, in connection with the merger
    agreement, Amendment No. 3 to the Rights Agreement, dated
    as of August 2, 2002, and as amended as of January 22,
    2003 and as of March 25, 2004, between XM and Computershare
    Investor Services, LLC, as successor rights agent to Equiserve
    Trust Company, N.A., or the Rights Agreement, was executed.
    Amendment No. 3 provides, among other things, that
    (i) neither SIRIUS nor any of its subsidiaries shall be
    deemed an acquiring person (as defined in the Rights
    Agreement) by virtue of (x) their acquisition, or their
    right to acquire, beneficial ownership of XM common stock as a
    result of their execution of the merger agreement, (y) the
    consummation of the merger or (z) any other transaction
    contemplated by the merger agreement; and (ii) no
    Distribution Date, Section 11(a)(ii)
    Event, Section 13 Event, Stock
    Acquisition Date or Triggering Event (as each
    such term is defined in the Rights Agreement) shall be deemed to
    have occurred by reason of the execution of the merger agreement
    or the announcement or consummation of the transactions
    contemplated thereby. Except as expressly provided in Amendment
    No. 3, the Rights Agreement remains in full force and
    effect.
    
    88
 
 
    LEGAL
    MATTERS
 
    The validity of the SIRIUS common stock and certain
    U.S. federal income tax consequences relating to the merger
    will be passed upon for SIRIUS by Simpson Thacher &
    Bartlett LLP, and certain U.S. federal income tax
    consequences relating to the merger will be passed upon for XM
    by Skadden, Arps, Slate, Meagher & Flom LLP.
 
    EXPERTS
 
    The consolidated financial statements and financial statement
    schedule and managements report on the effectiveness of
    internal control over financial reporting incorporated by
    reference in this Proxy Statement, which forms part of a
    Registration Statement on
    Form S-4,
    from SIRIUS
    Form 10-K
    for the year ended December 31, 2006, have been audited by
    Ernst & Young LLP, independent registered public
    accounting firm, as stated in their reports dated
    February 23, 2007 (which contains an explanatory paragraph
    relating to the adoption of Statement of Financial Accounting
    Standard No. 123 (revised 2004), Shared-Based
    Payment), and have been so incorporated in reliance upon
    such reports given on the authority of such firm as experts in
    accounting and auditing.
 
    The consolidated financial statements and schedule of XM
    Satellite Radio Holdings Inc. as of December 31, 2006 and
    2005, and for each of the years in the three-year period ended
    December 31, 2006, and managements assessment of the
    effectiveness of internal control over financial reporting as of
    December 31, 2006, have been incorporated by reference
    herein and in the registration statement in reliance upon the
    reports of KPMG LLP, independent registered public accounting
    firm, incorporated by reference herein, and upon the authority
    of said firm as experts in accounting and auditing. The audit
    report with respect to the consolidated financial statements
    refers to XM Satellite Radio Holdings Inc.s change in the
    method of accounting for stock-based compensation effective
    January 1, 2006.
 
    FUTURE
    STOCKHOLDER PROPOSALS
 
    SIRIUS
 
    To be eligible for inclusion in the proxy statement and form of
    proxy for SIRIUS next years annual meeting,
    stockholder proposals must be submitted in writing by the close
    of business on December 24, 2007 to Patrick L. Donnelly,
    Executive Vice President, General Counsel and Secretary, Sirius
    Satellite Radio Inc., 1221 Avenue of the Americas,
    36th Floor, New York, New York 10020.
 
    If any proposal that is not submitted for inclusion in next
    years proxy statement (as described in the preceding
    paragraph) is instead sought to be presented directly at next
    years annual meeting, the proxies may vote in their
    discretion if (a) SIRIUS receives notice of the proposal
    before the close of business on March 9, 2008 and advises
    stockholders in next years proxy statement about the
    nature of the matter and how management intends to vote on such
    matter or (b) SIRIUS does not receive notice of the
    proposal prior to the close of business on March 9, 2008.
    Notices of intention to present proposals at next years
    annual meeting should be addressed to Patrick L. Donnelly,
    Executive Vice President, General Counsel and Secretary, Sirius
    Satellite Radio Inc., 1221 Avenue of the Americas,
    36th Floor, New York, New York 10020.
 
    XM
 
    Any proposal or proposals by a stockholder intended to be
    included in XMs proxy statement and form of proxy relating
    to the 2008 annual meeting of XM stockholders must be received
    by XM no later than December 18, 2007, pursuant to the
    proxy solicitation rules of the SEC. Nothing in this paragraph
    shall be deemed to require XM to include in its proxy statement
    and proxy relating to the 2008 annual meeting of XM stockholders
    any stockholder proposal which may be omitted from XMs
    proxy materials pursuant to applicable regulations of the SEC in
    effect
    
    89
 
    at the time such proposal is received. For any proposal that is
    not submitted for inclusion in next years proxy statement
    but is instead presented directly at the 2008 annual meeting of
    XM stockholders, notice of such proposal must be received in
    writing by the Secretary of XM not less than 90 and not more
    than 120 days before the first anniversary of the preceding
    years annual meeting; provided, however, that in the event
    that the annual meeting is called for a date not within
    30 days before or after the anniversary of the preceding
    years annual meeting, notice by the stockholder to be
    timely must be so received not later than the close of business
    on the 10th day following the day on which such notice of
    the annual meeting was mailed or such public disclosure was
    made. Failure to provide notice in this manner and within this
    time period means that such proposal will be considered
    untimely. Management will be entitled to vote proxies in its
    discretion with respect to any proposal that is presented at the
    XM 2008 annual meeting of stockholders but not included in the
    proxy statement.
    
    90
 
 
    WHERE YOU
    CAN FIND MORE INFORMATION
 
    XM and SIRIUS file annual, quarterly and current reports, proxy
    statements and other information with the SEC. You may read and
    copy any of this information at the SECs public reference
    room at 100 F Street, N.E., Washington, D.C.
    20549. Please call the SEC at
    1-800-SEC-0330
    or
    202-942-8090
    for further information on the public reference room. The SEC
    also maintains an Internet website that contains reports, proxy
    statements and other information regarding issuers, including XM
    and SIRIUS, who file electronically with the SEC. The address of
    that site is www.sec.gov. The information contained on the
    SECs website is expressly not incorporated by reference
    into this Proxy Statement.
 
    SIRIUS has filed with the SEC a registration statement of which
    this Proxy Statement forms a part. The registration statement
    registers the shares of SIRIUS common stock to be issued to XM
    stockholders in connection with the merger. The registration
    statement, including the attached exhibits and annexes, contains
    additional relevant information about the common stock and
    preferred stock of SIRIUS and XM, respectively. The rules and
    regulations of the SEC allow SIRIUS and XM to omit certain
    information included in the registration statement from this
    Proxy Statement.
 
    In addition, the SEC allows SIRIUS and XM to disclose important
    information to you by referring you to other documents filed
    separately with the SEC. This information is considered to be a
    part of this Proxy Statement, except for any information that is
    superseded by information included directly in this Proxy
    Statement or incorporated by reference subsequent to the date of
    this Proxy Statement as described below.
 
    This Proxy Statement incorporates by reference the documents
    listed below that SIRIUS and XM have previously filed with the
    SEC. They contain important information about the companies and
    their financial condition.
 
    SIRIUS
    SEC Filings
 
    |  |  |  | 
    |  |  | Annual report on
    Form 10-K
    for the fiscal year ended December 31, 2006; | 
|  | 
    |  |  | Quarterly report on
    Form 10-Q
    for the quarter ended March 31, 2007; | 
|  | 
    |  |  | Current reports on
    Form 8-K
    filed on February 20, 2007, February 21, 2007,
    February 27, 2007, March 13, 2007, March 21,
    2007, April 12, 2007, May 22, 2007, June 7, 2007,
    June 8, 2007 and June 26, 2007; and | 
|  | 
    |  |  | The description of SIRIUS common stock contained in
    SIRIUS Registration Statement on
    Form 8-A
    filed pursuant to Section 12(b) of the Exchange Act. | 
 
    XM SEC
    Filings
 
    |  |  |  | 
    |  |  | Annual report on
    Form 10-K
    for the fiscal year ended December 31, 2006; | 
|  | 
    |  |  | Quarterly report on
    Form 10-Q
    for the quarter ended March 31, 2007; and | 
|  | 
    |  |  | Current reports on
    Form 8-K
    filed on February 14, 2007, February 20, 2007,
    February 21, 2007, February 22, 2007, March 13,
    2007, March 21, 2007, March 29, 2007, April 10,
    2007, April 12, 2007, June 1, 2007 and July 24,
    2007. | 
 
    In addition, SIRIUS and XM incorporate by reference any future
    filings they make with the SEC under Sections 13(a), 13(c),
    14 or 15(d) of the Exchange Act after the date of this Proxy
    Statement and before the date of the SIRIUS special meeting and
    the XM special meeting (excluding any current reports on
    Form 8-K
    to the extent disclosure is furnished and not filed). Those
    documents are considered to be a part of this Proxy Statement,
    effective as of the date they are filed. In the event of
    conflicting information in these documents, the information in
    the latest filed document should be considered correct.
    
    91
 
    You can obtain any of the other documents listed above from the
    SEC, through the SECs web site at the address described
    above, or from SIRIUS or XM, as applicable, by requesting them
    in writing or by telephone from the appropriate company at the
    following addresses:
 
    |  |  |  | 
| 
    By Mail:
    
 |  | By Mail: | 
|  |  |  | 
| 
 
Sirius Satellite Radio Inc.1221 Avenue of the Americas
 36th Floor
 New York, New York 10020
 Attention:  Investor Relations
 |  | XM Satellite Radio Holdings
    Inc. 1500 Eckington Place, NE
 Washington, DC 20002
 Attention: Investor Relations
 | 
|  |  |  | 
| 
    By Telephone: (212) 584-5180
    
 |  | By Telephone:
    (202) 380-4000 | 
 
    These documents are available from SIRIUS or XM, as the case may
    be, without charge, excluding any exhibits to them unless the
    exhibit is specifically listed as an exhibit to the registration
    statement of which this Proxy Statement forms a part. You can
    also find information about SIRIUS and XM at their Internet
    websites at www.sirius.com and www.xmradio.com, respectively.
    Information contained on these websites does not constitute part
    of this Proxy Statement.
 
    You may also obtain documents incorporated by reference into
    this document by requesting them in writing or by telephone
    from          ,
    SIRIUS proxy solicitor,
    or          ,
    XMs proxy solicitor, at the following addresses and
    telephone numbers:
 
    If you are a stockholder of XM and SIRIUS and would like to
    request documents, please do so
    by          ,
    2007 to receive them before your special meeting. If you request
    any documents from SIRIUS or XM, SIRIUS or XM will mail them to
    you by first class mail, or another equally prompt means, within
    one business day after SIRIUS or XM, as the case may be,
    receives your request.
 
    This document is a prospectus of SIRIUS and is a joint proxy
    statement of SIRIUS and XM for the SIRIUS special meeting and
    the XM special meeting. Neither SIRIUS nor XM has authorized
    anyone to give any information or make any representation about
    the merger or SIRIUS or XM that is different from, or in
    addition to, that contained in this Proxy Statement or in any of
    the materials that SIRIUS or XM has incorporated by reference
    into this Proxy Statement. Therefore, if anyone does give you
    information of this sort, you should not rely on it. The
    information contained in this document speaks only as of the
    date of this document unless the information specifically
    indicates that another date applies.
    
    92
 
    Annex A
 
    AGREEMENT AND PLAN OF MERGER
    DATED AS OF FEBRUARY 19, 2007
    BY AND AMONG
    SIRIUS SATELLITE RADIO INC.
    VERNON MERGER CORPORATION
    AND
    XM SATELLITE RADIO HOLDINGS INC.
 
 
    INDEX OF
    DEFINED TERMS
 
    |  |  |  |  |  | 
|  |  | Page | 
|  | 
| 
    Acquisition Proposal
    
 |  |  | A-31 |  | 
| 
    Acquisitions
    
 |  |  | A-22 |  | 
| 
    Agreement
    
 |  |  | A-1 |  | 
| 
    Applicable Antitrust Laws
    
 |  |  | A-9 |  | 
| 
    Benefit Plans
    
 |  |  | A-11 |  | 
| 
    Canadian Competition Act
    
 |  |  | A-9 |  | 
| 
    Certificate of Merger
    
 |  |  | A-1 |  | 
| 
    Certificates
    
 |  |  | A-3 |  | 
| 
    Change in Recommendation
    
 |  |  | A-31 |  | 
| 
    Change in Sirius Recommendation
    
 |  |  | A-29 |  | 
| 
    Change in XM Recommendation
    
 |  |  | A-28 |  | 
| 
    Closing
    
 |  |  | A-1 |  | 
| 
    Closing Date
    
 |  |  | A-1 |  | 
| 
    Code
    
 |  |  | A-1 |  | 
| 
    Common Exchange Ratio
    
 |  |  | A-2 |  | 
| 
    Common Merger Consideration
    
 |  |  | A-2 |  | 
| 
    Communications Laws
    
 |  |  | A-10 |  | 
| 
    Confidentiality Agreement
    
 |  |  | A-29 |  | 
| 
    Constituent Corporations
    
 |  |  | A-1 |  | 
| 
    Converted Equity Awards
    
 |  |  | A-5 |  | 
| 
    Converted Option
    
 |  |  | A-5 |  | 
| 
    Converted Stock Awards
    
 |  |  | A-5 |  | 
| 
    Converted Warrant
    
 |  |  | A-6 |  | 
| 
    CRTC
    
 |  |  | A-9 |  | 
| 
    Deadlock
    
 |  |  | A-34 |  | 
| 
    Designated Directors
    
 |  |  | A-34 |  | 
| 
    DGCL
    
 |  |  | A-1 |  | 
| 
    Effective Time
    
 |  |  | A-1 |  | 
| 
    Environmental Claim
    
 |  |  | A-13 |  | 
| 
    Environmental Laws
    
 |  |  | A-13 |  | 
| 
    Environmental Permits
    
 |  |  | A-13 |  | 
| 
    ERISA
    
 |  |  | A-11 |  | 
| 
    ESPP
    
 |  |  | A-8 |  | 
| 
    Exchange Act
    
 |  |  | A-9 |  | 
| 
    Exchange Agent
    
 |  |  | A-3 |  | 
| 
    FCC
    
 |  |  | A-9 |  | 
| 
    Form S-4
    
 |  |  | A-27 |  | 
| 
    Governmental Entity
    
 |  |  | A-9 |  | 
| 
    HSR Act
    
 |  |  | A-9 |  | 
| 
    Independent Director
    
 |  |  | A-34 |  | 
| 
    Infringe
    
 |  |  | A-13 |  | 
| 
    Injunction
    
 |  |  | A-36 |  | 
| 
    Insiders
    
 |  |  | A-33 |  | 
    
    iii
 
    |  |  |  |  |  | 
|  |  | Page | 
|  | 
| 
    Intellectual Property
    
 |  |  | A-13 |  | 
| 
    J.P. Morgan
    
 |  |  | A-14 |  | 
| 
    Joint Proxy Statement/Prospectus
    
 |  |  | A-27 |  | 
| 
    material
    
 |  |  | A-7 |  | 
| 
    material adverse effect
    
 |  |  | A-7 |  | 
| 
    Merger
    
 |  |  | A-1 |  | 
| 
    Merger Co. 
    
 |  |  | A-1 |  | 
| 
    Merger Consideration
    
 |  |  | A-3 |  | 
| 
    Morgan Stanley
    
 |  |  | A-21 |  | 
| 
    NASDAQ
    
 |  |  | A-9 |  | 
| 
    Notice of Recommendation Change
    
 |  |  | A-31 |  | 
| 
    Occurrence
    
 |  |  | A-31 |  | 
| 
    Person
    
 |  |  | A-4 |  | 
| 
    Preferred Exchange Ratio
    
 |  |  | A-2 |  | 
| 
    Preferred Merger Consideration
    
 |  |  | A-2 |  | 
| 
    Public Proposal
    
 |  |  | A-39 |  | 
| 
    Qualifying Amendment
    
 |  |  | A-28 |  | 
| 
    Required Sirius Votes
    
 |  |  | A-19 |  | 
| 
    Required Stockholder Votes
    
 |  |  | A-19 |  | 
| 
    Required Stockholders Meetings
    
 |  |  | A-28 |  | 
| 
    Required XM Vote
    
 |  |  | A-12 |  | 
| 
    Requisite Regulatory Approvals
    
 |  |  | A-36 |  | 
| 
    Rights
    
 |  |  | A-7 |  | 
| 
    Rights Agreement
    
 |  |  | A-7 |  | 
| 
    SEC
    
 |  |  | A-6 |  | 
| 
    Section 16 Information
    
 |  |  | A-33 |  | 
| 
    Securities Act
    
 |  |  | A-8 |  | 
| 
    Significant Subsidiary
    
 |  |  | A-6 |  | 
| 
    Sirius
    
 |  |  | A-1 |  | 
| 
    Sirius Benefit Plans
    
 |  |  | A-18 |  | 
| 
    Sirius Board Approval
    
 |  |  | A-19 |  | 
| 
    Sirius Charter Amendment
    
 |  |  | A-16 |  | 
| 
    Sirius Common Stock
    
 |  |  | A-2 |  | 
| 
    Sirius Contracts
    
 |  |  | A-18 |  | 
| 
    Sirius Disclosure Schedule
    
 |  |  | A-14 |  | 
| 
    Sirius Election Date
    
 |  |  | A-31 |  | 
| 
    Sirius ERISA Affiliate
    
 |  |  | A-19 |  | 
| 
    Sirius Financial Statements
    
 |  |  | A-17 |  | 
| 
    Sirius Intellectual Property
    
 |  |  | A-20 |  | 
| 
    Sirius Mirror Preferred Stock
    
 |  |  | A-2 |  | 
| 
    Sirius Permits
    
 |  |  | A-17 |  | 
| 
    Sirius Permitted Liens
    
 |  |  | A-20 |  | 
| 
    Sirius Preferred Stock
    
 |  |  | A-15 |  | 
| 
    Sirius Recommendation
    
 |  |  | A-19 |  | 
    
    iv
 
    |  |  |  |  |  | 
|  |  | Page | 
|  | 
| 
    Sirius SEC Documents
    
 |  |  | A-16 |  | 
| 
    Sirius Share Issuance
    
 |  |  | A-16 |  | 
| 
    Sirius Stock Awards
    
 |  |  | A-15 |  | 
| 
    Sirius Stockholders Meeting
    
 |  |  | A-28 |  | 
| 
    Sirius Termination Fee
    
 |  |  | A-39 |  | 
| 
    Sirius Warrants
    
 |  |  | A-15 |  | 
| 
    Subsidiary
    
 |  |  | A-6 |  | 
| 
    Successor
    
 |  |  | A-34 |  | 
| 
    Superior Proposal
    
 |  |  | A-33 |  | 
| 
    Surviving Corporation
    
 |  |  | A-1 |  | 
| 
    tax
    
 |  |  | A-11 |  | 
| 
    taxable
    
 |  |  | A-11 |  | 
| 
    taxes
    
 |  |  | A-11 |  | 
| 
    U.S. 
    
 |  |  | A-4 |  | 
| 
    Violation
    
 |  |  | A-9 |  | 
| 
    Voting Debt
    
 |  |  | A-8 |  | 
| 
    XM
    
 |  |  | A-1 |  | 
| 
    XM Benefit Plan
    
 |  |  | A-11 |  | 
| 
    XM Board Approval
    
 |  |  | A-12 |  | 
| 
    XM Class C Common Stock
    
 |  |  | A-7 |  | 
| 
    XM Common Stock
    
 |  |  | A-2 |  | 
| 
    XM Contracts
    
 |  |  | A-11 |  | 
| 
    XM Disclosure Schedule
    
 |  |  | A-6 |  | 
| 
    XM Election Date
    
 |  |  | A-31 |  | 
| 
    XM ERISA Affiliate
    
 |  |  | A-12 |  | 
| 
    XM Financial Statements
    
 |  |  | A-9 |  | 
| 
    XM Indemnified Parties
    
 |  |  | A-34 |  | 
| 
    XM Intellectual Property
    
 |  |  | A-13 |  | 
| 
    XM Merger Stock
    
 |  |  | A-2 |  | 
| 
    XM Option
    
 |  |  | A-5 |  | 
| 
    XM Permits
    
 |  |  | A-10 |  | 
| 
    XM Permitted Liens
    
 |  |  | A-13 |  | 
| 
    XM Preferred Stock
    
 |  |  | A-7 |  | 
| 
    XM Recommendation
    
 |  |  | A-12 |  | 
| 
    XM SEC Documents
    
 |  |  | A-9 |  | 
| 
    XM Series A Preferred Stock
    
 |  |  | A-2 |  | 
| 
    XM Series B Preferred Stock
    
 |  |  | A-7 |  | 
| 
    XM Series C Preferred Stock
    
 |  |  | A-7 |  | 
| 
    XM Stock Awards
    
 |  |  | A-5 |  | 
| 
    XM Stockholders Meeting
    
 |  |  | A-28 |  | 
| 
    XM Termination Fee
    
 |  |  | A-39 |  | 
| 
    XM Warrant
    
 |  |  | A-6 |  | 
| 
    XMs Current Premium
    
 |  |  | A-35 |  | 
    
    v
 
    AGREEMENT AND PLAN OF MERGER dated as of February 19, 2007
    (this Agreement) is by and among Sirius
    Satellite Radio Inc., a Delaware corporation
    (Sirius), Vernon Merger Corporation, a
    Delaware corporation and a direct wholly-owned subsidiary of
    Sirius (Merger Co.), and XM Satellite Radio
    Holdings Inc., a Delaware corporation (XM).
 
    WITNESSETH:
    
 
    WHEREAS, each of the respective Boards of Directors of Sirius,
    Merger Co. and XM has approved, and deemed it advisable and in
    the best interests of its stockholders to consummate, the
    business combination transaction provided for herein, including
    the merger (the Merger) of Merger Co. with
    and into XM in accordance with the applicable provisions of the
    Delaware General Corporation Law (the DGCL),
    and upon the terms and subject to the conditions set forth
    herein;
 
    WHEREAS, Sirius and XM intend the Merger to qualify as a
    reorganization within the meaning of Section 368 of the
    Internal Revenue Code of 1986, as amended, and the rules and
    regulations promulgated thereunder (the
    Code); and
 
    WHEREAS, Sirius and XM desire to make certain representations,
    warranties, covenants and agreements in connection with the
    Merger and also to prescribe certain conditions to the Merger.
 
    NOW, THEREFORE, in consideration of the foregoing and the
    respective representations, warranties, covenants and agreements
    set forth herein, the parties hereto agree as follows:
 
    ARTICLE I
    
 
    The Merger
    
 
    1.1  Effective Time of
    Merger.  Subject to the provisions of this
    Agreement, a certificate of merger (the Certificate of
    Merger) shall be duly prepared, executed by XM and
    thereafter delivered to the Secretary of State of the State of
    Delaware for filing, as provided in the DGCL, on the Closing
    Date (as defined in Section 1.2). The Merger shall become
    effective upon the filing of the Certificate of Merger with the
    Secretary of State of the State of Delaware or at such time
    thereafter as is agreed upon in writing by Sirius and XM and
    provided in the Certificate of Merger (the Effective
    Time).
 
    1.2  Closing.  The closing
    of the Merger (the Closing) will take place
    at 10:00 a.m. on the date (the Closing
    Date) that is the second business day after the
    satisfaction or waiver (subject to applicable law) of the
    conditions set forth in Article VI (excluding conditions
    that, by their terms, are to be satisfied on the Closing Date
    but subject to the satisfaction or waiver of such conditions),
    unless another time or date is agreed to in writing by the
    parties hereto. The Closing shall be held at the offices of
    Simpson Thacher & Bartlett LLP, 425 Lexington Avenue,
    New York, New York 10017, unless another place is agreed to in
    writing by the parties hereto.
 
    1.3  Effects of the
    Merger.  At the Effective Time, Merger Co.
    shall be merged with and into XM and the separate existence of
    Merger Co. shall cease and XM shall continue as the surviving
    corporation in the Merger. The Merger will have the effects set
    forth in the DGCL. As used in this Agreement,
    Constituent Corporations shall mean each of
    Merger Co. and XM, and Surviving Corporation
    shall mean XM, at and after the Effective Time, as the surviving
    corporation in the Merger.
 
    1.4  Certificate of
    Incorporation.  At the Effective Time, the
    certificate of incorporation of XM as in effect immediately
    prior to the Effective Time shall be the certificate of
    incorporation of the Surviving Corporation until thereafter
    changed or amended as provided therein or by applicable law.
 
    1.5  By-Laws.  At the
    Effective Time, the By-laws of Merger Co. as in effect
    immediately prior to the Effective Time shall be the By-laws of
    the Surviving Corporation until thereafter changed or amended as
    provided therein or by applicable law.
 
    1.6  Officers and Directors of Surviving
    Corporation.  The officers of XM as of the
    Effective Time shall be the officers of the Surviving
    Corporation, until the earlier of their resignation or removal
    or otherwise ceasing to be
    
    A-1
 
    an officer or until their respective successors are duly elected
    and qualified, as the case may be. The directors of Merger Co.
    as of the Effective Time shall be the directors of the Surviving
    Corporation until the earlier of their resignation or removal or
    otherwise ceasing to be a director or until their respective
    successors are duly elected and qualified.
 
    ARTICLE II
    
 
    Effects of
    the Merger
    
 
    2.1  Effect on Capital
    Stock.  At the Effective Time, by virtue
    of the Merger and without any action on the part of the holder
    of any shares of the XM Common Stock:
 
    (a) Cancellation of Treasury
    Stock.  All shares of Class A common
    stock, par value $0.01 per share, of XM (the XM
    Common Stock) and shares of Series A Convertible
    Preferred Stock, par value $0.01 per share, of XM (the
    XM Series A Preferred Stock and,
    together with the XM Common Stock, the XM Merger
    Stock) that are owned by XM as treasury stock shall be
    canceled and shall cease to exist, and no shares of common
    stock, par value $.001 per share, of Sirius (the
    Sirius Common Stock) or other consideration
    shall be delivered in exchange therefor.
 
    (b) Conversion of the XM Common
    Stock.  Subject to Section 2.3, each
    share of the XM Common Stock issued and outstanding immediately
    prior to the Effective Time (other than (i) shares to be
    canceled in accordance with Section 2.1(a),
    (ii) shares owned by Sirius immediately prior to the
    Effective Time, which shares shall be cancelled and
    extinguished, and (iii) shares owned by any direct or
    indirect wholly-owned Subsidiary (as defined in
    Section 3.1(a)(i)) of Sirius or any direct or indirect
    wholly-owned Subsidiary of XM immediately prior to the Effective
    Time, which shares shall remain outstanding) shall be canceled
    and extinguished and automatically converted into the right to
    receive 4.60 (the Common Exchange Ratio)
    fully paid and nonassessable shares of Sirius Common Stock
    (together with any cash paid in respect of fractional shares in
    accordance with Section 2.3, the Common Merger
    Consideration). Upon such conversion, all such shares
    of the XM Common Stock shall no longer be outstanding and shall
    automatically be canceled and extinguished and shall cease to
    exist, and each certificate previously representing any such
    shares shall thereafter represent only the right to receive the
    Common Merger Consideration in respect of such shares upon the
    surrender of the certificate representing such shares in
    accordance with Section 2.2 (or in the case of a lost,
    stolen or destroyed certificate, upon delivery of an affidavit
    (and bond, if required) in the manner provided in
    Section 2.4). The Common Exchange Ratio shall be
    appropriately adjusted to reflect fully the effect of any stock
    split, reverse stock split, stock dividend (including any
    dividend or distribution of securities convertible into Sirius
    Common Stock or XM Common Stock), reorganization,
    recapitalization, reclassification or other like change with
    respect to Sirius Common Stock or XM Common Stock having a
    record date on or after the date hereof and prior to the
    Effective Time.
 
    (c) Conversion of XM Series A Preferred
    Stock.  Each share of the XM Series A
    Preferred Stock issued and outstanding immediately prior to the
    Effective Time (other than (i) shares to be canceled in
    accordance with Section 2.1(a), (ii) shares owned by
    Sirius immediately prior to the Effective Time, which shares
    shall be cancelled and extinguished, (iii) shares owned by
    any direct or indirect wholly-owned Subsidiary of Sirius or any
    direct or indirect wholly-owned Subsidiary of XM immediately
    prior to the Effective Time, which shares shall remain
    outstanding, and (iv) shares held by holders who have
    properly demanded and perfected (and not withdrawn or lost)
    appraisal rights with respect thereto in accordance with
    Section 262 of the DGCL) shall be canceled and extinguished
    and automatically converted into the right to receive 4.60 (the
    Preferred Exchange Ratio) fully paid and
    nonassessable shares of a newly-designated series of Sirius
    Preferred Stock (as defined in Section 3.2(b)) (the
    Sirius Mirror Preferred Stock) having the
    same powers, designations, preferences, rights and
    qualifications, limitations and restrictions (to the fullest
    extent practicable) as the shares of XM Series A Preferred
    Stock so converted, except that the holders thereof shall be
    entitled to vote, together with the holders of the shares of
    Sirius Common Stock (and any other class or series that may
    similarly be entitled to vote with the shares of Sirius Common
    Stock) as a single class, upon all matters upon which holders of
    Sirius Common Stock are entitled to vote, with each share of
    Sirius Preferred Stock entitled to 1/5th of one vote on
    such matters (the Preferred Merger
    Consideration and, together with the Common Merger
    Consideration,
    
    A-2
 
    the Merger Consideration). Upon such
    conversion, all such shares of the XM Series A Preferred
    Stock shall no longer be outstanding and shall automatically be
    canceled and extinguished and shall cease to exist, and each
    certificate previously representing any such shares shall
    thereafter represent only the right to receive the Preferred
    Merger Consideration in respect of such shares upon the
    surrender of the certificate representing such shares in
    accordance with Section 2.2 (or in the case of a lost,
    stolen or destroyed certificate, upon delivery of an affidavit
    (and bond, if required) in the manner provided in
    Section 2.4). The Preferred Exchange Ratio shall be
    appropriately adjusted to reflect fully the effect of any stock
    split, reverse stock split, stock dividend (including any
    dividend or distribution of securities convertible into XM
    Series A Preferred Stock, XM Common Stock or Sirius Common
    Stock), reorganization, recapitalization, reclassification or
    other like change with respect to XM Series A Preferred
    Stock, XM Common Stock or Sirius Common Stock having a record
    date on or after the date hereof and prior to the Effective Time.
 
    (d) Merger Co. Capital Stock.  Each
    share of common stock, par value $0.01 per share, of Merger
    Co. outstanding immediately prior to the Effective Time shall be
    automatically converted into and become one fully paid and
    non-assessable share of common stock of the Surviving
    Corporation. Each certificate evidencing ownership of such
    shares of common stock of Merger Co. shall thereafter evidence
    ownership of shares of common stock of the Surviving Corporation.
 
    2.2  Surrender and
    Payment.  (a) Sirius shall appoint an
    agent (the Exchange Agent) reasonably
    acceptable to XM for the purpose of exchanging certificates
    which immediately prior to the Effective Time evidenced shares
    of XM Merger Stock (the Certificates) for the
    applicable Merger Consideration pursuant to an exchange agent
    agreement in form and substance reasonably satisfactory to XM.
    At or as promptly as practicable (and, in any event, within two
    (2) business days) after the Effective Time, Sirius shall
    deposit, or shall cause to be deposited, with the Exchange
    Agent, the Merger Consideration to be exchanged or paid in
    accordance with this Article II, and Sirius shall make
    available from time to time after the Effective Time as
    necessary, cash in an amount sufficient to pay any cash payable
    in lieu of fractional shares pursuant to Section 2.3 and
    any dividends or distributions to which holders of shares of XM
    Merger Stock may be entitled pursuant to Section 2.2(c).
    The Surviving Corporation shall send, or shall cause the
    Exchange Agent to send, to each holder of record of shares of XM
    Merger Stock immediately prior to the Effective Time whose
    shares were converted into the right to receive the applicable
    Merger Consideration pursuant to Section 2.1, promptly
    after the Effective Time, (i) a letter of transmittal for
    use in such exchange (which shall be in form and substance
    reasonably satisfactory to Sirius and XM and shall specify that
    the delivery shall be effected, and risk of loss and title in
    respect of the Certificates shall pass, only upon proper
    delivery of the Certificates to the Exchange Agent) and
    (ii) instructions to effect the surrender of the
    Certificates in exchange for the applicable Merger
    Consideration, cash payable in respect thereof in lieu of any
    fractional shares pursuant to Section 2.3 and any dividends
    or other distributions payable in respect thereof pursuant to
    Section 2.2(c).
 
    (b) Each holder of shares of XM Merger Stock that have been
    converted into a right to receive the applicable Merger
    Consideration, cash payable in respect thereof in lieu of any
    fractional shares pursuant to Section 2.3 and any dividends
    or other distributions payable in respect thereof pursuant to
    Section 2.2(c), upon surrender to the Exchange Agent of a
    Certificate or Certificates, together with a properly completed
    letter of transmittal covering such shares and such other
    documents as the Exchange Agent may reasonably require, shall be
    entitled to receive the applicable Merger Consideration payable
    in respect of such shares of XM Merger Stock. The holder of such
    Certificate, upon its delivery thereof to the Exchange Agent,
    shall also receive any dividends or other distributions to which
    such holder is entitled pursuant to Section 2.2(c) and cash
    payable in respect of any fractional shares pursuant to
    Section 2.3. Certificates surrendered shall forthwith be
    canceled as of the Effective Time. Until so surrendered, each
    such Certificate, following the Effective Time, shall represent
    for all purposes only the right to receive the applicable Merger
    Consideration, cash payable in respect thereof in lieu of any
    fractional shares pursuant to Section 2.3 and any dividends
    or other distributions payable in respect thereof pursuant to
    Section 2.2(c). No interest shall be paid or accrued for
    the benefit of holders of the Certificates on cash amounts
    payable upon the surrender of such Certificates pursuant to this
    Section 2.2.
 
    (c) Whenever a dividend or other distribution is declared
    or made after the date hereof with respect to Sirius Common
    Stock with a record date after the Effective Time, such
    declaration shall include a dividend or other distribution in
    respect of all shares of Sirius Common Stock and Sirius Mirror
    Preferred Stock issuable pursuant to this Agreement. No
    dividends or other distributions declared or made after the
    Effective Time with respect to Sirius
    
    A-3
 
    Common Stock with a record date after the Effective Time shall
    be paid to the holder of any unsurrendered Certificate with
    respect to the Sirius Common Stock or Sirius Mirror Preferred
    Stock such holder is entitled to receive until the holder of
    such Certificate shall surrender such Certificate in accordance
    with the provisions of this Section 2.2. Subject to
    applicable law, following surrender of any such Certificate,
    there shall be paid to the record holder of the certificates
    representing whole Sirius Common Stock and Sirius Mirror
    Preferred Stock issued in exchange therefor, without interest,
    at the time of such surrender, the amount of dividends or other
    distributions with a record date after the Effective Time
    theretofore paid with respect to such whole Sirius Common Stock
    and Sirius Mirror Preferred Stock.
 
    (d) In the event that a transfer of ownership of shares of
    XM Merger Stock is not registered in the stock transfer
    books or ledger of XM, or if any certificate for the applicable
    Merger Consideration is to be issued in a name other than that
    in which the Certificate surrendered in exchange therefor is
    registered, it shall be a condition to the issuance thereof that
    the Certificate or Certificates so surrendered shall be properly
    endorsed or otherwise be in proper form for transfer and that
    the Person requesting such exchange shall have paid to the
    Exchange Agent any transfer or other taxes required as a result
    of the issuance of a certificate for Sirius Common Stock or
    Sirius Mirror Preferred Stock in any name other than that of the
    registered holder of such shares of XM Merger Stock, or
    establish to the satisfaction of the Exchange Agent that such
    tax has been paid or is not payable. For purposes of this
    Agreement, Person means an individual, a
    corporation, a limited liability company, a partnership, an
    association, a trust or any other entity or organization,
    including a government or political subdivision or any agency or
    instrumentality thereof.
 
    (e) After the Effective Time, there shall be no further
    registration of transfers of shares of XM Merger Stock. If,
    after the Effective Time, any Certificate formerly representing
    shares of XM Merger Stock is presented to the Surviving
    Corporation, it shall be canceled and exchanged for the
    applicable Merger Consideration provided for, and in accordance
    with the procedures set forth, in this Article II.
 
    (f) None of Sirius, Merger Co., XM or any of their
    respective Subsidiaries or affiliates shall be liable to any
    holder of shares of XM Merger Stock for any Merger
    Consideration delivered to a public official pursuant to any
    applicable abandoned property, escheat or similar law.
 
    (g) Each of the Exchange Agent, the Surviving Corporation
    and Sirius shall be entitled to deduct and withhold from the
    Merger Consideration otherwise payable to any holder of shares
    of XM Merger Stock, and from any cash dividends or other
    distributions that the holder is entitled to receive under
    Section 2.2(c), such amounts as the Exchange Agent, the
    Surviving Corporation or Sirius is required to deduct and
    withhold with respect to the making of such payment under the
    Code, or any provision of United States
    (U.S.) federal, state or local tax law or any
    other
    non-U.S. tax
    law or any other applicable legal requirement. To the extent
    that amounts are so withheld by the Exchange Agent, the
    Surviving Corporation or Sirius, such amounts withheld from the
    Merger Consideration and other such amounts payable under
    Section 2.2(c) shall be treated for all purposes of this
    Agreement as having been received by the holder of the shares of
    XM Merger Stock in respect of which such deduction and
    withholding was made by the Exchange Agent, the Surviving
    Corporation or Sirius.
 
    (h) Any portion of the certificates evidencing the Sirius
    Common Stock or the Sirius Mirror Preferred Stock, the cash to
    be paid in respect of fractional shares pursuant to
    Section 2.3, and the cash or other property in respect of
    dividends or other distributions pursuant to Section 2.2(c)
    supplied to the Exchange Agent which remains unclaimed by the
    holders of shares of XM Merger Stock twelve
    (12) months after the Effective Time shall be returned to
    Sirius, upon demand, and any such holder who has not exchanged
    his shares of XM Merger Stock for the applicable Merger
    Consideration in accordance with this Section 2.2 prior to
    the time of demand shall thereafter look only to Sirius for
    payment of the applicable Merger Consideration, and any cash
    payable in respect thereof in lieu of any fractional shares
    pursuant to Section 2.3 and any dividends or distributions
    with respect to Sirius Common Stock to which they were entitled
    pursuant to Section 2.2(c), in each case, without interest.
 
    2.3  Fractional
    Shares.  No certificates representing less
    than one share of Sirius Common Stock shall be issued in
    exchange for shares of XM Common Stock upon the surrender
    for exchange of a Certificate. In lieu of any such fractional
    share, each holder of shares of XM Common Stock who would
    otherwise have been entitled to a fraction of a share of Sirius
    Common Stock upon surrender of Certificates for exchange (or in
    the case of a lost, stolen or destroyed certificate, upon
    delivery of an affidavit (and bond, if required) in the manner
    provided in
    
    A-4
 
    Section 2.4) shall be paid upon such surrender (and after
    taking into account and aggregating shares of XM Common
    Stock represented by all Certificates surrendered by such
    holder) cash (without interest) in an amount equal to the
    product obtained by multiplying (a) the fractional share
    interest to which such holder (after taking into account and
    aggregating all shares of XM Common Stock represented by
    all Certificates surrendered by such holder) would otherwise be
    entitled by (b) the closing price for a share of Sirius
    Common Stock on the NASDAQ Global Select Market on the last
    trading day immediately preceding the Effective Time. Fractional
    shares of Sirius Mirror Preferred Stock may be issued in
    exchange for shares of XM Series A Preferred Stock.
 
    2.4  Lost, Stolen or Destroyed
    Certificates.  In the event any
    Certificates shall have been lost, stolen or destroyed, the
    Exchange Agent shall issue in exchange for such lost, stolen or
    destroyed Certificates, upon the making of an affidavit of that
    fact by the holder thereof, the applicable Merger Consideration,
    any cash payable in respect thereof in lieu of any fractional
    shares pursuant to Section 2.3 and any dividends or other
    distributions as may be required pursuant to this
    Article II in respect of the shares of XM Merger Stock
    represented by such lost, stolen or destroyed Certificates;
    provided, however, that Sirius may, in its
    discretion and as a condition precedent to the issuance thereof,
    require the owner of such lost, stolen or destroyed Certificates
    to deliver a bond in such sum as it may reasonably direct as
    indemnity against any claim that may be made against Sirius or
    the Exchange Agent with respect to the Certificates alleged to
    have been lost, stolen or destroyed.
 
    2.5  Options and Other XM Stock
    Awards.  Prior to the Effective Time, XM
    and its Subsidiaries shall take all actions necessary to ensure
    that from and after the Effective Time, (x) options to
    purchase shares of the XM Common Stock (each, an
    XM Option) held by any employee, consultant,
    independent contractor and director and (y) other awards
    based on XM Common Stock (collectively with the XM Options,
    the XM Stock Awards) held by any employee,
    consultant, independent contractor and director which are
    outstanding immediately prior to the Effective Time shall be
    converted into and become, respectively, (x) options to
    purchase shares of Sirius Common Stock (each, a
    Converted Option) and, (y) with respect
    to all other XM Stock Awards, awards based on shares of Sirius
    Common Stock (the Converted Stock Awards and,
    together with the Converted Options, the Converted
    Equity Awards), in each case, on terms substantially
    identical to those in effect immediately prior to the Effective
    Time under the terms of the stock incentive plan or other
    related agreement or award pursuant to which such XM Stock
    Award was granted; provided, however, that from
    and after the Effective Time, (i) each such Converted
    Option may be exercised solely to purchase shares of Sirius
    Common Stock, (ii) the number of shares of Sirius Common
    Stock issuable upon exercise of such Converted Option shall be
    equal to the number of shares of the XM Common Stock that
    were issuable upon exercise under the corresponding
    XM Option immediately prior to the Effective Time
    multiplied by the Common Exchange Ratio and rounded down to the
    nearest whole share, (iii) the per share exercise price
    under such Converted Option shall be determined by dividing the
    per share exercise price of the corresponding XM Option
    immediately prior to the Effective Time by the Common Exchange
    Ratio and rounded up to the nearest whole cent, (iv) the
    number of shares of Sirius Common Stock subject to such
    Converted Stock Awards shall be determined by multiplying the
    number of the shares of XM Common Stock subject to the
    corresponding XM Stock Award immediately prior to the
    Effective Time by the Common Exchange Ratio and rounded down to
    the nearest whole share, (v) to the extent that the
    transfer of shares of XM Common Stock issuable upon
    exercise of any XM Option (or issued in connection with any
    previously exercised XM Option) is conditioned upon the
    fair market value of XM Common Stock achieving a specified
    percentage increase over the exercise price of such
    XM Option, such restriction shall be applied by requiring
    the same percentage increase in Sirius Common Stock over the
    exercise price of the corresponding Converted Option determined
    under clause (iii) above (or, in the case of a previously
    exercised XM Option, the exercise price that would have
    been determined under clause (iii) had such XM Option
    been outstanding at the Effective Time), (vi) to the extent
    the transfer of shares of XM Common Stock issuable or
    issued in connection with any XM Stock Award (whether or
    not outstanding at the Effective Time) is conditioned upon the
    fair market value of XM Common Stock achieving a specified
    percentage increase over the fair market value of XM Common
    Stock on the date of grant of such XM Stock Award, such
    restriction shall be applied by requiring the same percentage
    increase in Sirius Common Stock over the number derived by
    dividing (a) the fair market value of XM Common Stock on
    such date of grant by (b) the Common Exchange Ratio,
    rounded up to the nearest whole cent and (vii) to the
    extent the transfer of shares of XM Common Stock issuable or
    issued in connection with any XM Stock Award (whether or not
    outstanding at the Effective Time) is conditioned upon the fair
    market value of XM Common Stock achieving a specified dollar
    amount, such restriction shall be applied by
    (a) determining the percentage increase that such specified
    dollar amount represented over the fair market value of
    
    A-5
 
    XM Common Stock on the grant date of such XM Stock Award and
    (b) requiring the same percentage increase in Sirius Common
    Stock (expressed as a dollar amount) over the number derived by
    dividing (a) the fair market value of XM Common Stock on
    such date of grant by (b) the Common Exchange Ratio,
    rounded up to the nearest whole cent.
 
    2.6  XM Warrants.  Prior
    to the Effective Time, XM and its Subsidiaries shall take all
    actions necessary to ensure that from and after the Effective
    Time, each warrant to purchase shares of the XM Common Stock
    (each, an XM Warrant) which is outstanding
    immediately prior to the Effective Time, shall be converted into
    and become a warrant to purchase shares of Sirius Common Stock
    (each, a Converted Warrant) on terms
    substantially identical to those in effect immediately prior to
    the Effective Time under the terms of the warrant or other
    related agreement or award pursuant to which such XM Warrant was
    granted; provided, however, that, subject to the
    terms of the XM Warrants, from and after the Effective
    Time, (i) each such Converted Warrant may be exercised
    solely to purchase shares of Sirius Common Stock, (ii) the
    number of shares of Sirius Common Stock issuable upon exercise
    of such Converted Warrant shall be equal to the number of shares
    of the XM Common Stock that were issuable upon exercise under
    the corresponding XM Warrant immediately prior to the Effective
    Time multiplied by the Common Exchange Ratio and rounded down to
    the nearest whole share and (iii) the per share exercise
    price under such Converted Warrant shall be determined by
    dividing the per share exercise price of the corresponding XM
    Warrant immediately prior to the Effective Time by the Common
    Exchange Ratio and rounded up to the nearest whole cent.
 
    ARTICLE III
    
 
    Representations and Warranties
 
    3.1  Representations and Warranties of
    XM.  Except (x) with respect to any
    subsection of this Section 3.1, as set forth in the
    correspondingly identified subsection of the disclosure schedule
    delivered by XM to Sirius concurrently herewith (the XM
    Disclosure Schedule) (it being understood by the
    parties that the information disclosed in one subsection of the
    XM Disclosure Schedule shall be deemed to be included in each
    other subsection of the XM Disclosure Schedule in which the
    relevance of such information thereto would be readily apparent
    on the face thereof) or (y) as disclosed in the XM SEC
    Documents (as defined below) filed with the SEC prior to the
    date hereof, XM represents and warrants to Sirius as follows:
 
    (a) Organization, Standing and
    Power.  XM is a corporation duly organized,
    validly existing and in good standing under the laws of the
    State of Delaware, has all requisite power and authority to own,
    lease and operate its properties and to carry on its business as
    now being conducted, and is duly qualified and in good standing
    to do business in each jurisdiction in which the nature of its
    business or the ownership or leasing of its properties makes
    such qualification necessary, other than in such other
    jurisdictions where the failure so to qualify and be in such
    standing would not, either individually or in the aggregate,
    reasonably be expected to have a material adverse effect on XM.
    The Certificate of Incorporation and By-laws of XM, copies of
    which were previously made available to Sirius, are true,
    complete and correct copies of such documents as in effect on
    the date of this Agreement. As used in this Agreement:
 
    (i) the word Subsidiary when used with
    respect to any party, means any corporation or other
    organization, whether incorporated or unincorporated,
    (x) of which such party or any other Subsidiary of such
    party is a general partner (excluding partnerships, the general
    partnership interests of which held by such party or any
    Subsidiary of such party do not have a majority of the voting
    interests in such partnership), or (y) at least a majority
    of the securities or other interests of which, that have by
    their terms ordinary voting power to elect a majority of the
    board of directors or others performing similar functions with
    respect to such corporation or other organization, is directly
    or indirectly owned or controlled by such party or by any one or
    more of its Subsidiaries, or by such party and one or more of
    its Subsidiaries;
 
    (ii) a Significant Subsidiary means any
    Subsidiary of XM or Sirius, as the case may be, that would
    constitute a Significant Subsidiary of such party within the
    meaning of
    Rule 1-02
    of
    Regulation S-X
    of the Securities and Exchange Commission (the
    SEC);
    
    A-6
 
 
    (iii) any reference to any event, change or effect being
    material with respect to any entity means an
    event, change or effect which is material in relation to the
    financial condition, properties, assets, liabilities, businesses
    or results of operations of such entity and its Subsidiaries
    taken as a whole; and
 
    (iv) the term material adverse effect
    means, with respect to any entity, a material adverse effect on
    the financial condition, properties, assets, liabilities,
    businesses or results of operations of such entity and its
    Subsidiaries taken as a whole; provided that, for
    purposes of clause (iii) above and this clause (iv),
    the following shall not be deemed material or to
    have a material adverse effect: any change or event
    caused by or resulting from (A) changes in prevailing
    economic or market conditions in the United States or any other
    jurisdiction in which such entity has substantial business
    operations (except to the extent those changes have a materially
    disproportionate effect on such entity and its Subsidiaries
    relative to the other party and its Subsidiaries),
    (B) changes or events, after the date hereof, affecting the
    industries in which they operate generally (except to the extent
    those changes or events have a materially disproportionate
    effect on such entity and its Subsidiaries relative to the other
    party and its Subsidiaries), (C) changes, after the date
    hereof, in generally accepted accounting principles or
    requirements applicable to such entity and its Subsidiaries
    (except to the extent those changes have a materially
    disproportionate effect on such entity and its Subsidiaries
    relative to the other party and its Subsidiaries),
    (D) changes, after the date hereof, in laws, rules or
    regulations of general applicability or interpretations thereof
    by any Governmental Entity (as defined in
    Section 3.1(c)(iii)) (except to the extent those changes
    have a materially disproportionate effect on such entity and its
    Subsidiaries relative to the other party and its Subsidiaries),
    (E) the execution, delivery and performance of this
    Agreement or the consummation of the transactions contemplated
    hereby or thereby or the announcement thereof, or (F) any
    outbreak of major hostilities in which the United States is
    involved or any act of terrorism within the United States or
    directed against its facilities or citizens wherever located;
    and provided, further, that in no event shall a
    change in the trading prices of a partys capital stock, by
    itself, be considered material or constitute a material adverse
    effect.
 
    (b) Capital
    Structure.  (i) The authorized capital
    stock of XM consists of 600,000,000 shares of
    XM Common Stock, 15,000,000 shares of Class C
    Common Stock, par value $.01 per share (the
    XM Class C Common Stock), and
    60,000,000 preferred shares, par value $.01 per share (the
    XM Preferred Stock), of which
    (A) 15,000,000 shares of XM Preferred Stock are
    designated XM Series A Preferred Stock,
    (B) 3,000,000 shares of XM Preferred Stock are
    designated Series B Redeemable Preferred Stock (the
    XM Series B Preferred Stock),
    (C) 250,000 shares of XM Preferred Stock are
    designated Series C Convertible Redeemable Preferred Stock
    (the XM Series C Preferred Stock) and
    (D) 250,000 shares of XM Preferred Stock are
    designated Series D Junior Participating Preferred Stock
    and reserved for issuance upon exercise of the rights (the
    Rights) distributed to the holders of XM
    Common Stock pursuant to the Rights Agreement, dated as of
    August 2, 2002, between XM and Computershare Investor
    Services, LLC, as successor rights agent to Equiserve Trust
    Company (as amended to the date hereof, the Rights
    Agreement). As of the close of business on
    February 15, 2007 (x) (1) 309,689,999 shares
    of XM Common Stock were issued (including 5,502 shares held
    in treasury and 3,427,859 shares of unvested restricted
    stock), (2) 5,393,252 shares of XM Common Stock
    were reserved for issuance upon the conversion of the XM
    Series A Preferred Stock, (3) 8,000,000 shares of
    XM Common Stock were reserved for issuance upon the conversion
    of XMs 1.75% Convertible Senior Notes Due 2009, and
    (4) 5,502 shares of XM Common Stock were held by XM in
    its treasury or by its Subsidiaries,
    (y) 5,393,252 shares of XM Series A Preferred
    Stock were outstanding, and (z) other than the outstanding
    shares of XM Series A Preferred Stock, no shares of XM
    Preferred Stock were outstanding or reserved for issuance, and
    no shares of XM Class C Common Stock were outstanding. As
    of the close of business on February 15, 2007, no shares of
    XM Common Stock were reserved for issuance pursuant to XM Stock
    Awards outstanding on such date (other than
    3,427,859 shares of unvested restricted stock and XM
    Options outstanding on such date). As of the close of business
    on December 31, 2006, (aa) 11,163,985 shares of
    XM Common Stock were reserved for issuance upon the conversion
    of XMs 10% Senior Secured Discount Notes due 2009,
    (bb) 15,894,434 shares of XM Common Stock were reserved for
    issuance upon the exercise of XM Options outstanding on such
    date, with a weighted average exercise price of $17.81 per
    share and (cc) 11,314,966 shares of XM Common Stock
    were reserved for issuance upon exercise of the XM Warrants. All
    outstanding shares of XM Common Stock or XM Preferred Stock have
    been
    
    A-7
 
    duly authorized and validly issued and are fully paid and,
    except as set forth in the DGCL, non assessable and are not
    subject to preemptive rights.
 
    (ii) Section 3.1(b)(ii) of the XM Disclosure Schedule
    sets forth a complete and accurate list as of February 15,
    2007 of each XM Warrant then outstanding, the number of shares
    of XM Common Stock subject to such XM Warrant and the exercise
    or purchase price (if any) and the expiration date thereof.
 
    (iii) No bonds, debentures, notes or other indebtedness
    having the right to vote on any matters on which stockholders
    may vote (Voting Debt) of XM are issued or
    outstanding.
 
    (iv) Except for (A) this Agreement, (B) the
    outstanding XM Stock Awards specified in
    paragraph (i) above, (C) the convertible
    securities and warrants specified in paragraph (i) and
    described in paragraph (ii) above, and
    (D) agreements entered into and securities and other
    instruments issued after the date of this Agreement as permitted
    by Section 4.1, there are no options, warrants, calls,
    rights, commitments or agreements of any character to which XM
    or any Subsidiary of XM is a party or by which it or any such
    Subsidiary is bound obligating XM or any Subsidiary of XM to
    issue, deliver or sell, or cause to be issued, delivered or
    sold, additional shares of capital stock or any Voting Debt or
    stock appreciation rights of XM or of any Subsidiary of XM or
    obligating XM or any Subsidiary of XM to grant, extend or enter
    into any such option, warrant, call, right, commitment or
    agreement. There are no outstanding contractual obligations of
    XM or any of its Subsidiaries (x) to repurchase, redeem or
    otherwise acquire any shares of capital stock of XM or any of
    its Subsidiaries, or (y) pursuant to which XM or any of its
    Subsidiaries is or could be required to register shares of XM
    Common Stock or other securities under the Securities Act of
    1933, as amended (the Securities Act), except
    any such contractual obligations entered into after the date
    hereof as permitted by Section 4.1.
 
    (v) Since February 15, 2007, except as permitted by
    Section 4.1, XM has not (A) issued or permitted to be
    issued any shares of capital stock, stock appreciation rights or
    securities exercisable or exchangeable for or convertible into
    shares of capital stock of XM or any of its Subsidiaries, other
    than pursuant to and as required by the terms of XM Stock Awards
    granted prior to the date hereof (or awards granted after the
    date hereof in compliance with Sections 4.1(c) and 4.1(k));
    (B) repurchased, redeemed or otherwise acquired, directly
    or indirectly through one or more XM Subsidiaries, any shares of
    capital stock of XM or any of its Subsidiaries; or
    (C) declared, set aside, made or paid to the stockholders
    of XM dividends or other distributions on the outstanding shares
    of capital stock of XM.
 
    (vi) After the date hereof, no future offering periods
    shall be commenced under XMs Employee Stock Purchase Plan
    (the ESPP). Subject to the share issuance
    limitations set forth in Section 4.1(c), the current
    offering period in effect on the date hereof under the ESPP will
    continue in accordance with its terms, and options under the
    current offering period will be exercisable at the normally
    scheduled time under the ESPP in accordance with its terms;
    provided, however, that in all events the
    expiration of such offering period and the final exercise under
    the ESPP shall occur prior to the Effective Time, and XM shall
    take all actions necessary to amend the ESPP to so provide. XM
    shall terminate the ESPP effective as of immediately prior to
    the Effective Time.
 
    (c) Authority.  (i) XM has all
    requisite corporate power and authority to enter into this
    Agreement and, subject in the case of the consummation of the
    Merger to the adoption of this Agreement by the Required XM
    Vote, to consummate the transactions contemplated hereby. The
    execution and delivery of this Agreement and the consummation of
    the transactions contemplated hereby have been duly authorized
    by all necessary corporate action on the part of XM, subject in
    the case of the consummation of the Merger to the Required XM
    Vote. This Agreement has been duly executed and delivered by XM
    and, assuming due authorization, execution and delivery by
    Sirius and Merger Co., constitutes a valid and binding
    obligation of XM, enforceable against XM in accordance with its
    terms, subject to bankruptcy, insolvency, fraudulent transfer,
    reorganization, moratorium and similar laws of general
    applicability relating to or affecting creditors rights
    and to general equitable principles.
 
    (ii) The execution and delivery of this Agreement does not,
    and the consummation of the transactions contemplated hereby
    will not, (A) conflict with, or result in any violation of,
    or constitute a default (with or without notice or lapse of
    time, or both) under, or give rise to a right of termination,
    cancellation, modification
    
    A-8
 
    or acceleration of any obligation or the loss of a material
    benefit under, or the creation of a lien, pledge, security
    interest, charge or other encumbrance on any assets (any such
    conflict, violation, default, right of termination,
    cancellation, modification or acceleration, loss or creation, a
    Violation) pursuant to, any provision of the
    Certificate of Incorporation or By-laws of XM or any Subsidiary
    of XM, or (B) subject to obtaining or making the consents,
    approvals, orders, authorizations, registrations, declarations
    and filings referred to in paragraph (iii) below,
    result in any Violation of any loan or credit agreement, note,
    mortgage, indenture, lease, XM Benefit Plan (as defined in
    Section 3.1(i)) or other agreement, obligation, instrument,
    permit, concession, franchise, license, judgment, order, decree,
    statute, law, ordinance, rule or regulation applicable to XM or
    any Subsidiary of XM or their respective properties or assets,
    which Violation, in the case of clause (B), individually or in
    the aggregate, would reasonably be expected to (x) have a
    material adverse effect on XM or (y) prevent, delay or
    impede XMs ability to perform its obligations hereunder or
    to consummate the transactions contemplated hereby.
 
    (iii) No consent, approval, order or authorization of, or
    registration, declaration or filing with, any court,
    administrative agency or commission or other governmental
    authority or instrumentality, domestic or foreign (a
    Governmental Entity) is required by or with
    respect to XM or any Subsidiary of XM in connection with the
    execution and delivery of this Agreement by XM or the
    consummation by XM of the transactions contemplated hereby, the
    failure to make or obtain which, individually or in the
    aggregate, would reasonably be expected to (x) have a
    material adverse effect on XM or (y) prevent, delay or
    impede XMs ability to perform its obligations hereunder or
    to consummate the transactions contemplated hereby, except for
    (A) the filing with the SEC of the Joint Proxy
    Statement/Prospectus and such other reports under the Securities
    Act and the Securities Exchange Act of 1934, as amended (the
    Exchange Act), as may be required in
    connection with this Agreement and the transactions contemplated
    hereby and the obtaining from the SEC of such orders as may be
    required in connection therewith, (B) the filing of the
    Certificate of Merger with the Secretary of State of the State
    of Delaware, (C) notices or filings under the Hart Scott
    Rodino Antitrust Improvements Act of 1976, as amended (the
    HSR Act), (D) such notices or filings as
    may be required pursuant to the Competition Act (Canada) (the
    Canadian Competition Act) and, together with
    the HSR Act, the Applicable Antitrust Laws),
    (E) such filings with and consents of the Federal
    Communications Commission (FCC) and the
    Canadian Radio-television and Telecommunications Commission (the
    CRTC) as may be required (including any
    notifications or other filings that do not require consent), and
    (F) such filings with and approvals of The Nasdaq Stock
    Market, Inc. (NASDAQ) as may be required.
 
    (d) SEC Documents; Undisclosed
    Liabilities.  (i) XM has filed, or
    furnished, as applicable, all required reports, schedules,
    registration statements and other documents with the SEC since
    December 31, 2004 (the XM SEC
    Documents). As of their respective dates of filing
    with the SEC (or, if amended or superseded by a filing prior to
    the date hereof, as of the date of such filing), the XM SEC
    Documents complied in all material respects with the
    requirements of the Securities Act or the Exchange Act, as the
    case may be, and the rules and regulations of the SEC thereunder
    applicable to such XM SEC Documents, and none of the XM SEC
    Documents when filed contained any untrue statement of a
    material fact or omitted to state a material fact required to be
    stated therein or necessary to make the statements therein, in
    light of the circumstances under which they were made, not
    misleading. The financial statements of XM included in the XM
    SEC Documents complied as to form, as of their respective dates
    of filing with the SEC, in all material respects with all
    applicable accounting requirements and with the published rules
    and regulations of the SEC with respect thereto (except, in the
    case of unaudited statements, as permitted by
    Form 10-Q
    of the SEC), have been prepared in accordance with generally
    accepted accounting principles applied on a consistent basis
    during the periods involved (except as may be disclosed therein)
    and fairly present in all material respects the consolidated
    financial position of XM and its consolidated Subsidiaries and
    the consolidated results of operations, changes in
    stockholders equity and cash flows of such companies as of
    the dates and for the periods shown. There are no outstanding
    comments from the Staff of the SEC with respect to any of the XM
    SEC Documents.
 
    (ii) Except for (A) those liabilities that are fully
    reflected or reserved for in the consolidated financial
    statements of XM included in its Quarterly Report on
    Form 10-Q
    for the fiscal quarter ended September 30, 2006, as filed
    with the SEC prior to the date of this Agreement (the
    XM Financial Statements),
    (B) liabilities
    
    A-9
 
    incurred since September 30, 2006 in the ordinary course of
    business consistent with past practice, (C) liabilities
    which would not, individually or in the aggregate, reasonably be
    expected to have a material adverse effect on XM,
    (D) liabilities incurred pursuant to the transactions
    contemplated by this Agreement, and (E) liabilities or
    obligations discharged or paid in full prior to the date of this
    Agreement in the ordinary course of business consistent with
    past practice, XM and its Subsidiaries do not have, and since
    September 30, 2006, XM and its Subsidiaries have not
    incurred (except as permitted by Section 4.1), any
    liabilities or obligations of any nature whatsoever (whether
    accrued, absolute, matured, determined, contingent or otherwise
    and whether or not required to be reflected in XMs
    financial statements in accordance with generally accepted
    accounting principles).
 
    (e) Compliance with Applicable Laws and Reporting
    Requirements.  (i) XM and its
    Subsidiaries hold all permits, licenses, variances, exemptions,
    orders and approvals of all Governmental Entities which are
    material to the operation of the businesses of XM and its
    Subsidiaries, taken as a whole (the XM
    Permits), and XM and its Subsidiaries are and have
    been in compliance with the terms of the XM Permits and all
    applicable laws and regulations and their own privacy policies,
    including the Communications Act of 1934, as amended, and the
    rules, regulations and published decisions, orders, rulings and
    notices of the FCC (the Communications Laws),
    except where the failure so to hold or comply, individually or
    in the aggregate, would not reasonably be expected to have a
    material adverse effect on XM.
 
    (ii) The businesses of XM and its Subsidiaries are not
    being and have not been conducted in violation of any law,
    ordinance or regulation of any Governmental Entity (including
    the Sarbanes-Oxley Act of 2002 and the Communications Laws),
    except for possible violations which, individually or in the
    aggregate, do not have, and would not reasonably be expected to
    have, a material adverse effect on XM.
 
    (iii) XM and its Subsidiaries have designed and maintain a
    system of internal controls over financial reporting (as defined
    in
    Rules 13a-15(f)
    and
    15d-15(f) of
    the Exchange Act) sufficient to provide reasonable assurances
    regarding the reliability of financial reporting and the
    preparation of financial statements for external purposes in
    accordance with generally accepted accounting principles. XM
    (A) has designed and maintains disclosure controls and
    procedures (as defined in
    Rules 13a-15(e)
    and
    15d-15(e) of
    the Exchange Act) to ensure that material information required
    to be disclosed by XM in the reports that it files or submits
    under the Exchange Act is recorded, processed, summarized and
    reported within the time periods specified in the SECs
    rules and forms and is accumulated and communicated to XMs
    management as appropriate to allow timely decisions regarding
    required disclosure, and (B) has disclosed, based on its
    most recent evaluation of such disclosure controls and
    procedures prior to the date hereof, to XMs auditors and
    the audit committee of XMs Board of Directors (1) any
    significant deficiencies and material weaknesses in the design
    or operation of internal controls over financial reporting which
    are reasonably likely to adversely affect in any material
    respect XMs ability to record, process, summarize and
    report financial information and (2) any fraud, whether or
    not material, that involves management or other employees who
    have a significant role in XMs internal controls over
    financial reporting.
 
    (f) Legal Proceedings.  There is no
    claim, suit, action, litigation, arbitration, investigation or
    other demand or proceeding (whether judicial, arbitral,
    administrative or other) pending or, to the knowledge of XM,
    threatened, against or affecting XM or any Subsidiary of XM as
    to which there is a significant possibility of an adverse
    outcome which would, individually or in the aggregate, have a
    material adverse effect on XM, nor is there any judgment,
    decree, injunction, rule, award, settlement, stipulation or
    order of or subject to any Governmental Entity or arbitrator
    outstanding against XM or any Subsidiary of XM having or which
    would reasonably be expected to have, individually or in the
    aggregate, a material adverse effect on XM. To the knowledge of
    XM, no investigation by any Governmental Entity with respect to
    XM or any of its Subsidiaries is pending or threatened, other
    than, in each case, those the outcome of which, individually or
    in the aggregate, would not reasonably be expected to have a
    material adverse effect on XM.
 
    (g) Taxes.  XM and each of its
    Subsidiaries have filed all material tax returns required to be
    filed by any of them and have paid (or XM has paid on their
    behalf) all taxes shown as due on such returns, and the most
    recent financial statements contained in the XM SEC Documents
    reflect an adequate reserve, in accordance with generally
    accepted accounting principles, for all taxes payable by XM and
    its Subsidiaries accrued
    
    A-10
 
    through the date of such financial statements. No material
    deficiencies or other claims for any taxes have been proposed,
    asserted or assessed against XM or any of its Subsidiaries that
    are not adequately reserved for. For the purpose of this
    Agreement, the term tax (including, with
    correlative meaning, the terms taxes and
    taxable) shall mean (i) all Federal,
    state, local and foreign income, profits, franchise, gross
    receipts, payroll, sales, employment, use, property,
    withholding, excise, occupancy and other taxes, duties or
    assessments of any nature whatsoever, together with all
    interest, penalties and additions imposed with respect to such
    amounts, (ii) liability for the payment of any amounts of
    the type described in clause (i) as a result of being or
    having been a member of an affiliated, consolidated, combined or
    unitary group, and (iii) liability for the payment of any
    amounts as a result of being party to any tax sharing agreement
    or as a result of any express or implied obligation to indemnify
    any other person with respect to the payment of any amounts of
    the type described in clause (i) or (ii). Neither XM nor
    any of its Subsidiaries has taken any action or knows of any
    fact, agreement, plan or other circumstance that could
    reasonably be expected to prevent the Merger from qualifying as
    a reorganization within the meaning of Section 368(a) of
    the Code.
 
    (h) Certain Agreements.  Except as
    disclosed in or filed as exhibits to the XM SEC Documents filed
    prior to the date of this Agreement and except for this
    Agreement, neither XM nor any of its Subsidiaries is a party to
    or bound by any contract, arrangement, commitment or
    understanding (i) with respect to the service of any
    directors, officers, employees, or independent contractors or
    consultants that are natural persons, involving the payment of
    $10 million or more in any 12 month period,
    (ii) which is a material contract (as such term
    is defined in Item 601(b)(10) of
    Regulation S-K
    of the SEC), (iii) which limits the ability of XM or any of
    its Subsidiaries to compete in any line of business, in any
    geographic area or with any person, or which requires referrals
    of business and, in each case, which limitation or requirement
    would reasonably be expected to be material to XM and its
    Subsidiaries taken as a whole, (iv) with or to a labor
    union or guild (including any collective bargaining agreement),
    (v) which is a significant contract, arrangement or
    understanding with an automobile manufacturer, (vi) which
    is a contract, arrangement or understanding with a content
    provider involving the payment of $10 million or more in
    any 12 month period, or (vii) which would prevent,
    delay or impede the consummation, or otherwise reduce the
    contemplated benefits, of any of the transactions contemplated
    by this Agreement. XM has previously made available to Sirius or
    its representatives complete and accurate copies of each
    contract, arrangement, commitment or understanding of the type
    described in this Section 3.1(h) (collectively referred to
    herein as the XM Contracts). All of the XM
    Contracts are valid and in full force and effect, except to the
    extent they have previously expired in accordance with their
    terms or if the failure to be in full force and effect,
    individually or in the aggregate, would not reasonably be
    expected to have a material adverse effect on XM. Neither XM nor
    any of its Subsidiaries has, or is alleged to have, and to the
    knowledge of XM, none of the other parties thereto have,
    violated any provision of, or committed or failed to perform any
    act, and no event or condition exists, which with or without
    notice, lapse of time or both would constitute a default under
    the provisions of, any XM Contract, except in each case for
    those violations and defaults which, individually or in the
    aggregate, would not reasonably be expected to result in a
    material adverse effect on XM.
 
    (i) Benefit
    Plans.  (i) Section 3.1(i) of the XM
    Disclosure Schedule sets forth a true and complete list of each
    material XM Benefit Plan. An XM Benefit Plan
    is an employee benefit plan including, without limitation, any
    employee benefit plan, as defined in
    Section 3(3) of the Employee Retirement Income Security Act
    of 1974, as amended (ERISA), any
    multiemployer plan within the meaning of ERISA
    Section 3(37)) and each stock purchase, stock option,
    severance, employment,
    change-in-control,
    fringe benefit, collective bargaining, bonus, incentive or
    deferred compensation plan, agreement, program, policy or other
    arrangement, whether or not subject to ERISA (all the foregoing
    being herein called Benefit Plans
    (x) maintained, entered into or contributed to by XM or any
    of its Subsidiaries under which any present or former employee,
    director, independent contractor or consultant of XM or any of
    its Subsidiaries has any present or future right to benefits or
    (y) under which XM or any of its Subsidiaries could
    reasonably be expected to have any present or future liability.
    No XM Benefit Plan is subject to Section 302 or
    Title IV of ERISA or Section 412 of the Code.
 
    (ii) With respect to each material XM Benefit Plan, XM has
    made available to Sirius a current, accurate and complete copy
    thereof, and, to the extent applicable: (A) any related
    trust agreement or other funding
    
    A-11
 
    instrument; (B) the most recent determination letter, if
    applicable; (C) any summary plan description and summaries
    of material modifications; and (D) the most recent
    years Form 5500 and attached schedules and audited
    financial statements.
 
    (iii) With respect to the XM Benefit Plans, individually
    and in the aggregate, no event has occurred and, to the
    knowledge of XM, there exists no condition or set of
    circumstances in connection with which XM or any of its
    Subsidiaries could be subject to any liability that would
    reasonably be expected to have a material adverse effect on XM
    under ERISA, the Code or any other applicable law.
 
    (iv) No XM Benefit Plan exists that could result in the
    payment to any person of any money or other property or
    accelerate or provide any other rights or benefits to any person
    as a result of the transactions contemplated by this Agreement,
    whether alone or in connection with any other event, and whether
    or not such payment would constitute a parachute payment within
    the meaning of Code Section 280G.
 
    (v) Except as would not reasonably be expected to have a
    material adverse effect on XM or any of its Subsidiaries,
    (A) no liability under Title IV or section 302 of
    ERISA has been incurred by XM, or by any trade or business,
    whether or not incorporated, that together with XM would be
    deemed a single employer within the meaning of
    section 4001(b) of ERISA (an XM ERISA
    Affiliate), that has not been satisfied in full, and
    (B) no condition exists that presents a risk to XM or any
    XM ERISA Affiliate of incurring any such liability.
 
    (j) Subsidiaries.  Exhibit 21
    to XMs Annual Report on
    Form 10-K
    for the fiscal year ended December 31, 2005 filed with the
    SEC prior to the date of this Agreement includes all the
    Subsidiaries of XM which are Significant Subsidiaries. Each
    Subsidiary of XM is a corporation or other entity duly
    organized, validly existing and, in the case of corporations, in
    good standing under the laws of its jurisdiction of formation,
    has all requisite power and authority to own, lease and operate
    its properties and to carry on its business as now being
    conducted, and is duly qualified and in good standing to do
    business in each jurisdiction in which the nature of its
    business or the ownership or leasing of its properties makes
    such qualification necessary, other than in such jurisdictions
    where the failure so to qualify would not, either individually
    or in the aggregate, reasonably be expected to have a material
    adverse effect on XM. All of the shares of capital stock of each
    of the Subsidiaries held by XM or by another XM Subsidiary are
    fully paid and nonassessable and are owned by XM or a Subsidiary
    of XM free and clear of any material claim, lien or encumbrance,
    except for XM Permitted Liens.
 
    (k) Absence of Certain Changes or
    Events.  Except as disclosed in the XM SEC
    Documents filed prior to the date of this Agreement (or, in the
    case of actions taken after the date hereof, except as permitted
    by Section 4.1), since December 31, 2005, (i) XM
    and its Subsidiaries have conducted their respective businesses
    in the ordinary course consistent with their past practices and
    (ii) there has not been any change, circumstance or event
    (including any event involving a prospective change) which,
    individually or in the aggregate, has had, or would reasonably
    be expected to have, a material adverse effect on XM.
 
    (l) Board Approval.  The Board of
    Directors of XM, by resolutions duly adopted at a meeting duly
    called and held (the XM Board Approval), has
    (i) determined that this Agreement and the Merger are in
    the best interests of XM and its stockholders, (ii) adopted
    a resolution approving this Agreement and declaring its
    advisability pursuant to Section 251(b) of the DGCL,
    (iii) recommended that the stockholders of XM adopt this
    Agreement (the XM Recommendation) and
    directed that such matter be submitted for consideration by XM
    stockholders at the XM Stockholders Meeting (as defined in
    Section 5.1(b)). To the knowledge of XM, except for
    Section 203 of the DGCL (which has been rendered
    inapplicable), no moratorium, control
    share, fair price or other anti-takeover law
    or regulation is applicable to this Agreement, the Merger, or
    the other transactions contemplated hereby.
 
    (m) Vote Required.  The affirmative
    vote of the holders of a majority of the outstanding shares of
    XM Common Stock to adopt this Agreement (the Required
    XM Vote) is the only vote of the holders of any class
    or series of XM capital stock necessary to approve and adopt
    this Agreement and the transactions contemplated hereby
    (including the Merger).
 
    (n) Properties.  Except as would
    not reasonably be expected to have, individually or in the
    aggregate, a material adverse effect on XM, and except as set
    forth in Section 3.1(n) of the XM Disclosure Schedule, XM
    or one of its Subsidiaries (i) has good and marketable
    title to all the properties and assets reflected in the XM
    
    A-12
 
    Financial Statements as being owned by XM or one of its
    Subsidiaries or acquired after the date thereof which are
    material to XMs business on a consolidated basis (except
    properties sold or otherwise disposed of since the date thereof
    in the ordinary course of business), free and clear of all
    claims, liens, charges, security interests or encumbrances of
    any nature whatsoever, except (A) statutory liens securing
    payments not yet due or liens which are being properly contested
    by XM or one of its Subsidiaries in good faith and by proper
    legal proceedings and for which adequate reserves related
    thereto are maintained on the XM Financial Statements,
    (B) such imperfections or irregularities of title, claims,
    liens, charges, security interests, easements, covenants and
    other restrictions or encumbrances as do not materially affect
    the use of the properties or assets subject thereto or affected
    thereby or otherwise materially impair business operations at
    such properties, (C) mortgages, or deeds of trust, security
    interests or other encumbrances on title related to indebtedness
    reflected in the XM Financial Statements (except such liens
    which have been satisfied or otherwise discharged in the
    ordinary course of business since the date of the XM SEC
    Documents), and (D) rights granted to any non-exclusive
    licensee of any XM Intellectual Property in the ordinary course
    of business consistent with past practices (such liens,
    imperfections and irregularities in clauses (A), (B), (C),
    and (D) XM Permitted Liens), and
    (ii) is the lessee of all leasehold estates reflected in
    the XM Financial Statements or acquired after the date thereof
    which are material to its business on a consolidated basis
    (except for leases that have expired by their terms since the
    date thereof) and is in possession of the properties purported
    to be leased thereunder, and each such lease is valid without
    default thereunder by the lessee or, to XMs knowledge, the
    lessor.
 
    (o) Intellectual Property.  Except
    as would not, individually or in the aggregate, reasonably be
    expected to have a material adverse effect, (i) XM or its
    Subsidiaries own, free and clear of all claims, liens, charges,
    security interests or encumbrances of any nature whatsoever
    other than XM Permitted Liens, or have a valid license or right
    to use all Intellectual Property used in their business as
    currently conducted (the XM Intellectual
    Property), (ii) to the knowledge of XM, XM and
    its Subsidiaries do not infringe, misappropriate, dilute, or
    otherwise violate (Infringe) the Intellectual
    Property rights of any third party and the XM Intellectual
    Property is not being Infringed by any third party,
    (iii) to the knowledge of XM, none of the material XM
    Intellectual Property has expired or been abandoned and, to the
    knowledge of XM, all such material XM Intellectual Property is
    valid and enforceable and (iv) XM and its Subsidiaries have
    taken all reasonable actions to protect and maintain the
    confidentiality of any trade secrets and other confidential
    information included in the material XM Intellectual Property.
    Intellectual Property means all intellectual
    property, including, without limitation, all United States and
    foreign (u) patents, patent applications, patent
    disclosures, and all related continuations,
    continuations-in-part,
    divisionals, reissues, re-examinations, substitutions, and
    extensions thereof, (v) proprietary inventions,
    discoveries, technology and know-how, (w) copyrights and
    copyrightable works, including proprietary rights in software
    programs, (x) trademarks, service marks, domain names,
    trade dress, trade names, corporate names, brand names, slogans,
    logos and other source indicators, and the goodwill of any
    business symbolized thereby, (y) rights of publicity, and
    (z) trade secrets, and confidential or proprietary business
    information.
 
    (p) Environmental Matters.  Except
    as would not, individually or in the aggregate, reasonably be
    expected to have a material adverse effect on XM, (i) XM
    and its Subsidiaries hold, and are currently, and at all prior
    times have been, in continuous compliance with all permits,
    licenses, registrations and other governmental authorizations
    required under all applicable foreign, federal, state and local
    statutes, rules, regulations, ordinances, orders or decrees
    relating to contamination, pollution or protection of human
    health, natural resources or the environment
    (Environmental Laws) for XM to conduct its
    operations (Environmental Permits), and are
    currently, and at all prior times have been, otherwise in
    continuous compliance with all applicable Environmental Laws
    and, to the knowledge of XM, there is no condition that would
    reasonably be expected to prevent or interfere with compliance
    with all applicable Environmental Laws and all applicable
    Environmental Permits in the future, (ii) XM and its
    Subsidiaries have not received any written notice, claim,
    demand, action, suit, complaint, proceeding or other
    communication by any person alleging any violation of, or any
    actual or potential liability under, any Environmental Laws (an
    Environmental Claim), and XM has no knowledge
    of any pending or threatened Environmental Claim, (iii) no
    hazardous, dangerous or toxic substance, including without
    limitation, petroleum (including without limitation crude oil or
    any fraction thereof), asbestos and asbestos-containing
    materials, polychlorinated biphenyls, radon, fungus, mold,
    urea-formaldehyde insulation or any other material that is
    regulated pursuant to any Environmental Laws or that
    
    A-13
 
    could result in liability under any Environmental Laws has been
    generated, transported, treated, stored, installed, disposed of,
    arranged to be disposed of, released or threatened to be
    released at, on, from or under any of the properties or
    facilities currently or formerly owned, leased or otherwise used
    by XM or its Subsidiaries, in violation of, or in a manner or to
    a location that could give rise to liability to XM or its
    Subsidiaries under Environmental Laws, and (iv) XM and its
    Subsidiaries have not assumed, contractually or by operation of
    law, any liabilities or obligations under or relating to any
    Environmental Laws.
 
    (q) Labor and Employment
    Matters.  Except as would not, individually or
    in the aggregate, reasonably be expected to have a material
    adverse effect on XM, (i) there is no labor strike,
    dispute, slowdown, stoppage or lockout actually pending or, to
    the knowledge of XM, threatened against XM or any of its
    Subsidiaries, (ii) no union or labor organization
    represents, or claims to represent, any group of employees with
    respect to their employment by XM or any of Subsidiaries and no
    union organizing campaign with respect to the employees of XM or
    its Subsidiaries is threatened or underway, (iii) there is
    no unfair labor practice charge or complaint against XM or its
    Subsidiaries pending or, to the knowledge of XM, threatened
    before the National Labor Relations Board or any similar state
    or foreign agency, (iv) there is no grievance pending
    relating to any collective bargaining agreement or other
    grievance procedure, (v) no charges with respect to or
    relating to XM or its Subsidiaries are pending before the Equal
    Employment Opportunity Commission or any other agency
    responsible for the prevention of unlawful employment practices
    and (vi) no employee of XM or its Subsidiaries is in
    violation of any term of any restrictive covenant, common law
    nondisclosure obligation, fiduciary duty, or other obligation to
    a former employer of any such employee relating (A) to the
    right of any such employee to be employed by XM or its
    Subsidiaries or (B) to the knowledge or use of trade
    secrets or proprietary information.
 
    (r) Insurance.  All material
    insurance policies of XM and its Subsidiaries are in full force
    and effect and provide insurance in such amounts and against
    such risks as the management of XM reasonably has determined to
    be prudent in accordance with industry practices or as is
    required by law. Neither XM nor any of its Subsidiaries is in
    material breach or default, and neither XM nor any of its
    Subsidiaries has taken any action or failed to take any action
    which, with notice or the lapse of time or both, would
    constitute such a breach or default, or permit termination or
    modification, of any of such material insurance policies.
 
    (s) Brokers or Finders.  No agent,
    broker, investment banker, financial advisor or other firm or
    person except J.P. Morgan Securities Inc.
    (J.P. Morgan) is or will be entitled to
    any brokers or finders fee or any other similar
    commission or fee in connection with any of the transactions
    contemplated by this Agreement. XM has disclosed to Sirius all
    material terms of the engagement of J.P. Morgan.
 
    (t) Opinion of XM Financial
    Advisor.  XM has received the opinion of
    J.P. Morgan, dated the date of this Agreement, to the
    effect that the Common Exchange Ratio is fair, from a financial
    point of view, to XM and the holders of XM Common Stock.
 
    (u) Rights Agreement.  The Board of
    Directors of XM has caused the Rights Agreement to be amended so
    that neither Sirius nor Merger Co. will become an
    Acquiring Person, and that no Stock
    Acquisition Date, Distribution Date or
    Triggering Event (as such terms are defined in the
    Rights Agreement) will occur, as a result of the approval,
    execution or delivery of this Agreement or the consummation of
    the transactions contemplated hereby.
 
    3.2  Representations and Warranties of
    Sirius.  Except (x) with respect to
    any subsection of this Section 3.2, as set forth in the
    correspondingly identified subsection of the disclosure schedule
    delivered by Sirius to XM concurrently herewith (the
    Sirius Disclosure Schedule) (it being
    understood by the parties that the information disclosed in one
    subsection of the Sirius Disclosure Schedule shall be deemed to
    be included in each other subsection of the Sirius Disclosure
    Schedule in which the relevance of such information thereto
    would be readily apparent on the face thereof), or (y) as
    disclosed in the Sirius SEC Documents (as defined below) filed
    with the SEC prior to the date hereof, Sirius represents and
    warrants to XM as follows:
 
    (a) Organization, Standing and
    Power.  Sirius is a corporation duly
    organized, validly existing and in good standing under the laws
    of the State of Delaware, has all requisite power and authority
    to own, lease and operate its properties and to carry on its
    business as now being conducted, and is duly qualified and in
    good
    
    A-14
 
    standing to do business in each jurisdiction in which the nature
    of its business or the ownership or leasing of its properties
    makes such qualification necessary, other than in such other
    jurisdictions where the failure so to qualify and be in such
    standing would not, either individually or in the aggregate,
    reasonably be expected to have a material adverse effect on
    Sirius. The Certificate of Incorporation and By-laws of Sirius,
    copies of which were previously made available to XM, are true,
    complete and correct copies of such documents as in effect on
    the date of this Agreement.
 
    (b) Capital
    Structure.  (i) The authorized capital
    stock of Sirius consists of 2,500,000,000 shares of Sirius
    Common Stock and 50,000,000 shares of preferred stock, par
    value $.001 per share (the Sirius Preferred
    Stock). As of the close of business on
    February 16, 2007, (A)(1) 1,458,248,306 shares of
    Sirius Common Stock were issued (including shares held in
    treasury), (2) 82,044,101 shares of Sirius Common
    Stock were reserved for issuance upon the exercise or payment of
    stock options outstanding on such date, with a weighted average
    exercise price of $5.34 per share, and
    4,693,522 shares of Sirius Common Stock were reserved for
    issuance upon the exercise or payment of stock units or other
    equity-based incentive awards granted pursuant to any plans,
    agreements or arrangements of Sirius and outstanding on such
    date (collectively, the Sirius Stock Awards),
    (3) 61,274 shares of Sirius Common Stock were reserved
    for issuance upon the conversion of the Siriuss
    83/4% Convertible
    Subordinated Notes due 2009, (4) 26,392,764 shares of
    Sirius Common Stock were reserved for issuance upon the
    conversion of the Siriuss
    31/2% Convertible
    Notes due 2008, (5) 68,027,220 shares of Sirius Common
    Stock were reserved for issuance upon the conversion of the
    Siriuss
    21/2%
    Convertible Notes due 2009, (6) 43,396,216 shares of
    Sirius Common Stock were reserved for issuance upon the
    conversion of the Siriuss
    31/4% Convertible
    Notes due 2011, (7) 123,955,189 shares of Sirius
    Common Stock were reserved for issuance upon exercise of the
    Sirius Warrants (as defined below) and (8) no shares of
    Sirius Common Stock were held by Sirius in its treasury or by
    its Subsidiaries; and (B) no shares of Sirius Preferred
    Stock were outstanding or reserved for issuance. All outstanding
    shares of Sirius Common Stock have been duly authorized and
    validly issued and are fully paid and non-assessable and not
    subject to preemptive rights. The shares of Sirius Common Stock
    to be issued pursuant to or as specifically contemplated by this
    Agreement will have been duly authorized as of the Effective
    Time and, if and when issued in accordance with the terms hereof
    or thereof, will be validly issued, fully paid and
    non-assessable and will not be subject to preemptive rights.
 
    (ii) Section 3.2(b)(ii) of the Sirius Disclosure
    Schedule sets forth a complete and accurate list as of
    February 15, 2007 of each warrant to purchase shares of
    Sirius Common Stock (the Sirius Warrants)
    then outstanding, the number of shares of Sirius Common Stock
    subject to such Sirius Warrant and the exercise or purchase
    price (if any) and the expiration date thereof.
 
    (iii) No Voting Debt of Sirius is issued or outstanding.
 
    (iv) Except for (A) this Agreement,
    (B) outstanding Sirius Stock Awards described in
    paragraph (i) above, (C) the convertible
    securities and warrants described in
    paragraphs (i) and (ii) above which represented,
    as of February 15, 2007, the right to acquire up to an
    aggregate of 261,832,663 shares of Sirius Common Stock, and
    (D) agreements entered into and securities and other
    instruments issued after the date of this Agreement as permitted
    by Section 4.2, there are no options, warrants, calls,
    rights, commitments or agreements of any character to which
    Sirius or any Subsidiary of Sirius is a party or by which it or
    any such Subsidiary is bound obligating Sirius or any Subsidiary
    of Sirius to issue, deliver or sell, or cause to be issued,
    delivered or sold, additional shares of capital stock or any
    Voting Debt or stock appreciation rights of Sirius or of any
    Subsidiary of Sirius or obligating Sirius or any Subsidiary of
    Sirius to grant, extend or enter into any such option, warrant,
    call, right, commitment or agreement. There are no outstanding
    contractual obligations of Sirius or any of its Subsidiaries
    (x) to repurchase, redeem or otherwise acquire any shares
    of capital stock of Sirius or any of its Subsidiaries or
    (y) pursuant to which Sirius or any of its Subsidiaries is
    or could be required to register shares of Sirius Common Stock
    or other securities under the Securities Act, except any such
    contractual obligations entered into after the date hereof as
    permitted by Section 4.2.
 
    (v) Since February 15, 2007, except as permitted by
    Section 4.2, Sirius has not (A) issued or permitted to
    be issued any shares of capital stock, stock appreciation rights
    or securities exercisable or exchangeable for or convertible
    into shares of capital stock, of Sirius or any of its
    Subsidiaries, other than pursuant to and as
    
    A-15
 
    required by the terms of Sirius Stock Awards granted prior to
    the date hereof (or awards granted after the date hereof in
    compliance with Sections 4.2(c) and 4.2(k));
    (B) repurchased, redeemed or otherwise acquired, directly
    or indirectly through one or more Sirius Subsidiaries, any
    shares of capital stock of Sirius or any of its Subsidiaries; or
    (C) declared, set aside, made or paid to the stockholders
    of Sirius dividends or other distributions on the outstanding
    shares of capital stock of Sirius.
 
    (c) Authority.  (i) Sirius has
    all requisite corporate power and authority to enter into this
    Agreement and to consummate the transactions contemplated
    hereby, subject to the approval of the issuance of shares of
    Sirius Common Stock in the Merger (the Sirius Share
    Issuance) and the amendment of Siriuss
    certificate of incorporation to increase the total number of
    shares of all classes of stock that Sirius shall have the
    authority to issue to, and to increase the number of shares of
    Sirius Common Stock that Sirius shall have the authority to
    issue, in each case, to such number that is, at minimum,
    sufficient to consummate the transactions contemplated by this
    Agreement (the Sirius Charter Amendment) by
    the applicable Required Sirius Votes, and the designation of the
    Sirius Mirror Preferred Stock by the Sirius Board of Directors.
    The execution and delivery of this Agreement and the
    consummation of the transactions contemplated hereby have been
    duly authorized by all necessary corporate action on the part of
    Sirius, except for the Required Sirius Votes. This Agreement has
    been duly executed and delivered by Sirius and, assuming due
    authorization, execution and delivery by XM, constitutes a valid
    and binding obligation of Sirius, enforceable against Sirius in
    accordance with its terms, subject to bankruptcy, insolvency,
    fraudulent transfer, reorganization, moratorium and similar laws
    of general applicability relating to or affecting
    creditors rights and to general equitable principles.
 
    (ii) The execution and delivery of this Agreement does not,
    and the consummation of the transactions contemplated hereby
    will not, (A) result in any Violation pursuant to any
    provision of the Certificate of Incorporation or By-laws of
    Sirius or any Subsidiary of Sirius, or (B) subject to
    obtaining or making the consents, approvals, orders,
    authorizations, registrations, declarations and filings referred
    to in paragraph (iii) below, result in any Violation
    of any loan or credit agreement, note, mortgage, indenture,
    lease, Sirius Benefit Plan (as defined in Section 3.2(i))
    or other agreement, obligation, instrument, permit, concession,
    franchise, license, judgment, order, decree, statute, law,
    ordinance, rule or regulation applicable to Sirius or any
    Subsidiary of Sirius or their respective properties or assets
    which Violation, in the case of clause (B), individually or
    in the aggregate, would reasonably be expected to (x) have
    a material adverse effect on Sirius or (y) prevent, delay
    or impede Siriuss ability to perform its obligations
    hereunder or to consummate the transactions contemplated hereby.
 
    (iii) No consent, approval, order or authorization of, or
    registration, declaration or filing with, any Governmental
    Entity is required by or with respect to Sirius or any
    Subsidiary of Sirius in connection with the execution and
    delivery of this Agreement by Sirius or the consummation by
    Sirius of the transactions contemplated hereby, the failure to
    make or obtain which, individually or in the aggregate, would
    reasonably be expected to (x) have a material adverse
    effect on Sirius or (y) prevent, delay or impede
    Siriuss ability to perform its obligations hereunder or to
    consummate the transactions contemplated hereby, except for
    (A) the filing with the SEC of the
    Form S-4
    and such other reports under the Securities Act and the Exchange
    Act as may be required in connection with this Agreement and the
    transactions contemplated hereby and the obtaining from the SEC
    of such orders as may be required in connection therewith,
    (B) such filings and approvals as are required to be made
    or obtained under the securities or blue sky laws of various
    states in connection with the transactions contemplated by this
    Agreement, (C) the filing of the Sirius Charter Amendment,
    the Certificate of Merger and a Certificate of Designations with
    respect to the Sirius Preferred Stock with the Secretary of
    State of the State of Delaware, (D) the approval of the
    listing of the Sirius Common Stock to be issued in the Merger on
    NASDAQ, (E) such filings with and consents of the FCC and
    the CRTC as may be required (including any notifications or
    other filings that do not require consent), and
    (F) notices, filings and other authorizations under the
    Applicable Antitrust Laws.
 
    (d) SEC Documents; Undisclosed
    Liabilities.  (i) Sirius has filed all
    required reports, schedules, registration statements and other
    documents with the SEC since December 31, 2004 (the
    Sirius SEC Documents). As of their respective
    dates of filing with the SEC (or, if amended or superseded by a
    filing prior to the date hereof, as of the date of such filing),
    the Sirius SEC Documents complied in all material respects, with
    the requirements of the Securities Act or the Exchange Act, as
    the case may be, and the rules and
    
    A-16
 
    regulations of the SEC thereunder applicable to such Sirius SEC
    Documents, and none of the Sirius SEC Documents when filed
    contained any untrue statement of a material fact or omitted to
    state a material fact required to be stated therein or necessary
    to make the statements therein, in light of the circumstances
    under which they were made, not misleading. The financial
    statements of Sirius included in the Sirius SEC Documents
    complied as to form, as of their respective dates of filing with
    the SEC, in all material respects with all applicable accounting
    requirements and with the published rules and regulations of the
    SEC with respect thereto (except, in the case of unaudited
    statements, as permitted by
    Form 10-Q
    of the SEC), have been prepared in accordance with generally
    accepted accounting principles applied on a consistent basis
    during the periods involved (except as may be disclosed therein)
    and fairly present in all material respects the consolidated
    financial position of Sirius and its consolidated Subsidiaries
    and the consolidated results of operations, changes in
    stockholders equity and cash flows of such companies as of
    the dates and for the periods shown. There are no outstanding
    comments from the Staff of the SEC with respect to any of the
    Sirius SEC Documents.
 
    (ii) Except for (A) those liabilities that are fully
    reflected or reserved for in the consolidated financial
    statements of Sirius included in its Quarterly Report on
    Form 10-Q
    for the fiscal quarter ended September 30, 2006, as filed
    with the SEC prior to the date of this Agreement (the
    Sirius Financial Statements),
    (B) liabilities incurred since September 30, 2006 in
    the ordinary course of business consistent with past practice,
    (C) liabilities which would not, individually or in the
    aggregate, reasonably be expected to have a material adverse
    effect on Sirius, (D) liabilities incurred pursuant to the
    transactions contemplated by this Agreement, and
    (E) liabilities or obligations discharged or paid in full
    prior to the date of this Agreement in the ordinary course of
    business consistent with past practice, Sirius and its
    Subsidiaries do not have, and since September 30, 2006,
    Sirius and its Subsidiaries have not incurred (except as
    permitted by Section 4.2), any liabilities or obligations
    of any nature whatsoever (whether accrued, absolute, contingent
    or otherwise and whether or not required to be reflected in
    Siriuss financial statements in accordance with generally
    accepted accounting principles).
 
    (e) Compliance with Applicable Laws and Reporting
    Requirements.  (i) Sirius and its
    Subsidiaries hold all permits, licenses, variances, exemptions,
    orders and approvals of all Governmental Entities which are
    material to the operation of the businesses of Sirius and its
    Subsidiaries, taken as a whole (the Sirius
    Permits), and Sirius and its Subsidiaries are and have
    been in compliance with the terms of the Sirius Permits and all
    applicable laws and regulations and their own privacy policies,
    including the Communications Laws, except where the failure so
    to hold or comply, individually or in the aggregate, would not
    reasonably be expected to have a material adverse effect on
    Sirius.
 
    (ii) The businesses of Sirius and its Subsidiaries are not
    being and have not been conducted in violation of any law,
    ordinance or regulation of any Governmental Entity (including
    the Sarbanes-Oxley Act of 2002 and the Communications Laws),
    except for possible violations which, individually or in the
    aggregate, do not have, and would not reasonably be expected to
    have, a material adverse effect on Sirius.
 
    (iii) Sirius and its Subsidiaries have designed and
    maintain a system of internal controls over financial reporting
    (as defined in
    Rules 13a-15(f)
    and
    15d-15(f) of
    the Exchange Act) sufficient to provide reasonable assurances
    regarding the reliability of financial reporting and the
    preparation of financial statements for external purposes in
    accordance with generally accepted accounting principles. Sirius
    (A) has designed and maintains disclosure controls and
    procedures (as defined in
    Rules 13a-15(e)
    and
    15d-15(e) of
    the Exchange Act) to ensure that material information required
    to be disclosed by Sirius in the reports that it files or
    submits under the Exchange Act is recorded, processed,
    summarized and reported within the time periods specified in the
    SECs rules and forms and is accumulated and communicated
    to Siriuss management as appropriate to allow timely
    decisions regarding required disclosure, and (B) has
    disclosed, based on its most recent evaluation of such
    disclosure controls and procedures prior to the date hereof, to
    Siriuss auditors and the audit committee of Siriuss
    Board of Directors (1) any significant deficiencies and
    material weaknesses in the design or operation of internal
    controls over financial reporting which are reasonably likely to
    adversely affect in any material respect Siriuss ability
    to record, process, summarize and report financial information
    and (2) any fraud, whether or not material, that involves
    management or other employees who have a significant role in
    Siriuss internal controls over financial reporting.
    
    A-17
 
 
    (f) Legal Proceedings.  There is no
    claim, suit, action, litigation, arbitration, investigation or
    other demand or proceeding (whether judicial, arbitral,
    administrative or other) pending or, to the knowledge of Sirius,
    threatened, against or affecting Sirius or any Subsidiary of
    Sirius as to which there is a significant possibility of an
    adverse outcome which would, individually or in the aggregate,
    have a material adverse effect on Sirius, nor is there any
    judgment, decree, injunction, rule, award, settlement,
    stipulation or order of or subject to any Governmental Entity or
    arbitrator outstanding against Sirius or any Subsidiary of
    Sirius having, or which would reasonably be expected to have,
    individually or in the aggregate, a material adverse effect on
    Sirius. To the knowledge of Sirius, no investigation by any
    Governmental Entity with respect to Sirius or any of its
    Subsidiaries is pending or threatened, other than, in each case,
    those the outcome of which, individually or in the aggregate,
    would not reasonably be expected to have a material adverse
    effect on Sirius.
 
    (g) Taxes.  Sirius and each of its
    Subsidiaries have filed all material tax returns required to be
    filed by any of them and have paid (or Sirius has paid on their
    behalf) all taxes shown as due on such returns, and the most
    recent financial statements contained in the Sirius SEC
    Documents reflect an adequate reserve, in accordance with
    generally accepted accounting principles, for all taxes payable
    by Sirius and its Subsidiaries accrued through the date of such
    financial statements. No material deficiencies or other claims
    for any taxes have been proposed, asserted or assessed against
    Sirius or any of its Subsidiaries that are not adequately
    reserved for. Neither Sirius nor any of its Subsidiaries has
    taken any action or knows of any fact, agreement or plan or
    other circumstance that could reasonably be expected to prevent
    the Merger from qualifying as a reorganization within the
    meaning of Section 368(a) of the Code.
 
    (h) Certain Agreements.  Except as
    disclosed in or filed as exhibits to the Sirius SEC Documents
    filed prior to the date of this Agreement and except for this
    Agreement, neither Sirius nor any of its Subsidiaries is a party
    to or bound by any contract, arrangement, commitment or
    understanding (i) with respect to the service of any
    directors, officers, employees, or independent contractors or
    consultants that are natural persons, involving the payment of
    $10 million or more in any 12 month period,
    (ii) which is a material contract (as such term
    is defined in Item 601(b)(10) of
    Regulation S-K
    of the SEC), (iii) which limits the ability of Sirius or
    any of its Subsidiaries to compete in any line of business, in
    any geographic area or with any person, or which requires
    referrals of business and, in each case, which limitation or
    requirement would reasonably be expected to be material to
    Sirius and its Subsidiaries taken as a whole, (iv) with or
    to a labor union or guild (including any collective bargaining
    agreement), (v) which is a significant contract,
    arrangement or understanding with an automobile manufacturer,
    (vi) which is a contract, arrangement or understanding with
    a content provider involving the payment of $10 million or
    more in any 12 month period or (vii) which would
    prevent, delay or impede the consummation, or otherwise reduce
    the contemplated benefits, of any of the transactions
    contemplated by this Agreement. Sirius has previously made
    available to XM or its representatives complete and accurate
    copies of each contract, arrangement, commitment or
    understanding of the type described in this Section 3.2(h)
    (collectively referred to herein as Sirius
    Contracts). All of the Sirius Contracts are valid and
    in full force and effect, except to the extent they have
    previously expired in accordance with their terms or if the
    failure to be in full force and effect, individually or in the
    aggregate, would not reasonably be expected to have a material
    adverse effect on Sirius. Neither Sirius nor any of its
    Subsidiaries has, or is alleged to have, and to the knowledge of
    Sirius, none of the other parties thereto have, violated any
    provision of, or committed or failed to perform any act, and no
    event or condition exists, which, with or without notice, lapse
    of time or both would constitute a default under the provisions
    of, any Sirius Contract, except in each case for those
    violations and defaults which, individually or in the aggregate,
    would not reasonably be expected to result in a material adverse
    effect on Sirius.
 
    (i) Benefit
    Plans.  (i) Section 3.2(i) of the
    Sirius Disclosure Schedule sets forth a true and complete list
    of each material Sirius Benefit Plan. A Sirius Benefit
    Plan is a Benefit Plan (x) maintained, entered
    into or contributed to by Sirius or any of its Subsidiaries
    under which any present or former employee, director,
    independent contractor or consultant of Sirius or any of its
    Subsidiaries has any present or future right to benefits or
    (y) under which Sirius or any of its Subsidiaries could
    reasonably be expected to have any present or future liability.
    No Sirius Benefit Plan is subject to Section 302 or
    Title IV of ERISA of section 412 of the Code.
 
    (ii) With respect to each material Sirius Benefit Plan,
    Sirius has made available to XM a current, accurate and complete
    copy thereof, and, to the extent applicable: (A) any
    related trust agreement or other funding
    
    A-18
 
    instrument; (B) the most recent determination letter, if
    applicable; (C) any summary plan description and summaries
    of material modifications; and (D) the most recent
    years Form 5500 and attached schedules and audited
    financial statements.
 
    (iii) With respect to the Sirius Benefit Plans,
    individually and in the aggregate, no event has occurred and, to
    the knowledge of Sirius, there exists no condition or set of
    circumstances in connection with which Sirius or any of its
    Subsidiaries could be subject to any liability that would
    reasonably be expected to have a material adverse effect on
    Sirius under ERISA, the Code or any other applicable law.
 
    (iv) No Sirius Benefit Plan exists that could result in the
    payment to any person of any money or other property or
    accelerate or provide any other rights or benefits to any person
    as a result of the transactions contemplated by this Agreement,
    whether alone or in connection with any other event, and whether
    or not such payment would constitute a parachute payment within
    the meaning of Code Section 280G.
 
    (v) Except as would not reasonably be expected to have a
    material adverse effect on Sirius or any of its Subsidiaries,
    (A) no liability under Title IV or section 302 of
    ERISA has been incurred by Sirius, or by any trade or business,
    whether or not incorporated, that together with Sirius would be
    deemed a single employer within the meaning of
    section 4001(b) of ERISA (a Sirius ERISA
    Affiliate), that has not been satisfied in full, and
    (B) no condition exists that presents a risk to Sirius or
    any Sirius ERISA Affiliate of incurring any such liability.
 
    (j) Subsidiaries.  Exhibit 21
    to Siriuss Annual Report on
    Form 10-K
    for the fiscal year ended December 31, 2005 filed with the
    SEC prior to the date of this Agreement includes all the
    Subsidiaries of Sirius which are Significant Subsidiaries. Each
    Subsidiary of Sirius is a corporation or other entity duly
    organized, validly existing and, in the case of corporations, in
    good standing under the laws of its jurisdiction of formation,
    has all requisite power and authority to own, lease and operate
    its properties and to carry on its business as now being
    conducted, and is duly qualified and in good standing to do
    business in each jurisdiction in which the nature of its
    business or the ownership or leasing of its properties makes
    such qualification necessary, other than in such jurisdictions
    where the failure so to qualify would not, either individually
    or in the aggregate, reasonably be expected to have a material
    adverse effect on Sirius. All of the shares of capital stock of
    each of the Subsidiaries held by Sirius or by another Subsidiary
    of Sirius are fully paid and nonassessable and are owned by
    Sirius or a Subsidiary of Sirius free and clear of any material
    claim, lien or encumbrance, except for Sirius Permitted Liens.
 
    (k) Absence of Certain Changes or
    Events.  Except as disclosed in the Sirius SEC
    Documents filed prior to the date of this Agreement (or, in the
    case of actions taken after the date hereof, except as permitted
    by Section 4.2), since December 31, 2005,
    (i) Sirius and its Subsidiaries have conducted their
    respective businesses in the ordinary course consistent with
    their past practices and (ii) there has not been any
    change, circumstance or event (including any event involving a
    prospective change) which, individually or in the aggregate, has
    had, or would reasonably be expected to have, a material adverse
    effect on Sirius.
 
    (l) Board Approval.  The Board of
    Directors of Sirius, by resolutions duly adopted at a meeting
    duly called and held (the Sirius Board
    Approval), has (i) determined that this Agreement
    and the Merger are in the best interests of Sirius and its
    stockholders and the issuance of Sirius Common Stock in the
    Merger and the Sirius Charter Amendment to be advisable,
    (ii) adopted a resolution approving this Agreement, and
    (iii) recommended that the stockholders of Sirius approve
    the issuance of Sirius Common Stock in the Merger and the Sirius
    Charter Amendment (the Sirius Recommendation)
    and (iii) directed that such matters be submitted for
    consideration by Sirius stockholders at the Sirius Stockholders
    Meeting (as defined in Section 5.1(c)). To the knowledge of
    Sirius, no moratorium, control share,
    fair price or other anti-takeover law or regulation
    is applicable to this Agreement, the Merger or the other
    transactions contemplated hereby.
 
    (m) Vote Required.  Other than
    (i) the affirmative vote to approve the Sirius Share
    Issuance of the holders of Sirius Common Stock representing a
    majority of the votes cast by such holders at a meeting of
    stockholders of Sirius called for such purpose and entitled to
    vote thereon and (ii) the affirmative vote of a majority of
    the outstanding shares of Sirius Common Stock to approve the
    Sirius Charter Amendment (together, the Required Sirius
    Votes and, together with the Required XM Vote, the
    Required Stockholder 
    
    A-19
 
    Votes), no vote or consent of the holders of any
    class or series of capital stock of Sirius is required to
    approve this Agreement or the transactions contemplated hereby
    (including the Merger).
 
    (n) Properties.  Except as would
    not reasonably be expected to have, individually or in the
    aggregate, a material adverse effect on Sirius, Sirius or one of
    its Subsidiaries (i) has good and marketable title to all
    the properties and assets reflected in the Sirius Financial
    Statements as being owned by Sirius or one of its Subsidiaries
    or acquired after the date thereof which are material to
    Siriuss business on a consolidated basis (except
    properties sold or otherwise disposed of since the date thereof
    in the ordinary course of business), free and clear of all
    claims, liens, charges, security interests or encumbrances of
    any nature whatsoever, except (A) statutory liens securing
    payments not yet due or liens which are being properly contested
    by Sirius or one of its Subsidiaries in good faith and by proper
    legal proceedings and for which adequate reserves related
    thereto are maintained on the Sirius Financial Statements,
    (B) such imperfections or irregularities of title, claims,
    liens, charges, security interests, easements, covenants and
    other restrictions or encumbrances as do not materially affect
    the use of the properties or assets subject thereto or affected
    thereby or otherwise materially impair business operations at
    such properties, (C) mortgages, or deeds of trust, security
    interests or other encumbrances on title related to indebtedness
    reflected on the Sirius Financial Statements (except such liens
    which have been satisfied or otherwise discharged in the
    ordinary course of business since the date of the Sirius SEC
    Documents), and (D) rights granted to any non-exclusive
    licensee of any Sirius Intellectual Property in the ordinary
    course of business consistent with past practices (such liens,
    imperfections and irregularities in clauses (A), (B),
    (C) and (D), Sirius Permitted Liens),
    and (ii) is the lessee of all leasehold estates reflected
    in the Sirius Financial Statements or acquired after the date
    thereof which are material to its business on a consolidated
    basis (except for leases that have expired by their terms since
    the date thereof) and is in possession of the properties
    purported to be leased thereunder, and each such lease is valid
    without default thereunder by the lessee or, to Siriuss
    knowledge, the lessor.
 
    (o) Intellectual Property.  Except
    as would not, individually or in the aggregate, reasonably be
    expected to have a material adverse effect, (i) Sirius or
    its Subsidiaries own, free and clear of all claims, liens,
    charges, security interests or encumbrances of any nature
    whatsoever other than Sirius Permitted Liens, or have a valid
    license or right to use all Intellectual Property used in their
    business as currently conducted (the Sirius
    Intellectual Property), (ii) to the knowledge of
    Sirius and its Subsidiaries do not Infringe the Intellectual
    Property rights of any third party and the Sirius Intellectual
    Property is not being Infringed by any third party,
    (iii) to the knowledge of Sirius none of the material
    Sirius Intellectual Property has expired or been abandoned and
    to the knowledge of Sirius, all such material Sirius
    Intellectual Property is valid and enforceable and
    (iv) Sirius and its Subsidiaries have taken all reasonable
    actions to protect and maintain the confidentiality of any trade
    secrets and other confidential information included in the
    material Sirius Intellectual Property.
 
    (p) Environmental Matters.  Except
    as would not, individually or in the aggregate, reasonably be
    expected to have a material adverse effect on Sirius,
    (i) Sirius and its Subsidiaries hold, and are currently,
    and at all prior times have been, in continuous compliance with
    all Environmental Permits, and are currently, and at all prior
    times have been, otherwise in continuous compliance with all
    applicable Environmental Laws and, to the knowledge of Sirius,
    there is no condition that would reasonably be expected to
    prevent or interfere with compliance with all applicable
    Environmental Laws and all applicable Environmental Permits in
    the future, (ii) Sirius and its Subsidiaries have not
    received any Environmental Claim, and Sirius has no knowledge of
    any pending or threatened Environmental Claim, (iii) no
    hazardous, dangerous or toxic substance, including without
    limitation, petroleum (including without limitation crude oil or
    any fraction thereof), asbestos and asbestos-containing
    materials, polychlorinated biphenyls, radon, fungus, mold,
    urea-formaldehyde insulation or any other material that is
    regulated pursuant to any Environmental Laws or that could
    result in liability under any Environmental Laws has been
    generated, transported, treated, stored, installed, disposed of,
    arranged to be disposed of, released or threatened to be
    released at, on, from or under any of the properties or
    facilities currently or formerly owned, leased or otherwise used
    by Sirius or its Subsidiaries, in violation of, or in a manner
    or to a location that could give rise to liability to Sirius or
    its Subsidiaries under Environmental Laws, and (iv) Sirius
    and its Subsidiaries have not assumed, contractually or by
    operation of law, any liabilities or obligations under or
    relating to any Environmental Laws.
    
    A-20
 
 
    (q) Labor and Employment
    Matters.  Except as would not, individually or
    in the aggregate, reasonably be expected to have a material
    adverse effect on Sirius, (i) there is no labor strike,
    dispute, slowdown, stoppage or lockout actually pending or, to
    the knowledge of Sirius, threatened against Sirius or any of its
    Subsidiaries, (ii) no union or labor organization
    represents, or claims to represent, any group of employees with
    respect to their employment by Sirius or any of its Subsidiaries
    and no union organizing campaign with respect to the employees
    of Sirius or its Subsidiaries is threatened or underway,
    (iii) there is no unfair labor practice charge or complaint
    against Sirius or its Subsidiaries pending or, to the knowledge
    of Sirius, threatened before the National Labor Relations Board
    or any similar state or foreign agency, (iv) there is no
    grievance pending relating to any collective bargaining
    agreement or other grievance procedure, (v) no charges with
    respect to or relating to Sirius or its Subsidiaries are pending
    before the Equal Employment Opportunity Commission or any other
    agency responsible for the prevention of unlawful employment
    practices and (vi) no employee of Sirius or its
    Subsidiaries is in violation of any term of any restrictive
    covenant, common law nondisclosure obligation, fiduciary duty,
    or other obligation to a former employer of any such employee
    relating (A) to the right of any such employee to be
    employed by Sirius or its Subsidiaries or (B) to the
    knowledge or use of trade secrets or proprietary information.
 
    (r) Insurance.  All material
    insurance policies of Sirius and its Subsidiaries are in full
    force and effect and provide insurance in such amounts and
    against such risks as the management of Sirius reasonably has
    determined to be prudent in accordance with industry practices
    or as is required by law. Neither Sirius nor any of its
    Subsidiaries is in material breach or default, and neither
    Sirius nor any of its Subsidiaries has taken any action or
    failed to take any action which, with notice or the lapse of
    time or both, would constitute such a breach or default, or
    permit termination or modification, of any of such material
    insurance policies.
 
    (s) Brokers or Finders.  No agent,
    broker, investment banker, financial advisor or other firm or
    person except Morgan Stanley & Co. Incorporated
    (Morgan Stanley) is or will be entitled to
    any brokers or finders fee or any other similar
    commission or fee in connection with any of the transactions
    contemplated by this Agreement. Sirius has disclosed to XM all
    material terms of the engagement of Morgan Stanley.
 
    (t) Opinion of Sirius Financial
    Advisor.  Sirius has received the opinion of
    Morgan Stanley, dated February 18, 2007, to the effect that
    the Common Exchange Ratio is fair, from a financial point of
    view, to Sirius.
 
    ARTICLE IV
     
    Covenants Relating to Conduct of Business
    
 
    4.1  Covenants of
    XM.  During the period from the date of
    this Agreement and continuing until the Effective Time, XM
    agrees as to itself and its Subsidiaries that, except as
    expressly contemplated or permitted by this Agreement or to the
    extent that Sirius shall otherwise consent in writing, which
    consent shall not be unreasonably withheld or delayed:
 
    (a) Ordinary Course.  XM and its
    Subsidiaries shall carry on their respective businesses in the
    usual, regular and ordinary course consistent with past practice
    and use all reasonable efforts to preserve intact their present
    business organizations, maintain their rights, franchises,
    licenses and other authorizations issued by Governmental
    Entities and preserve their relationships with employees,
    customers, suppliers and others having business dealings with
    them to the end that their goodwill and ongoing businesses shall
    not be impaired in any material respect at the Effective Time.
    XM shall not, nor shall it permit any of its Subsidiaries to,
    (i) except as disclosed in the XM SEC Documents prior to
    the date of this Agreement or except as set forth in
    Section 4.1(a)(i) of the XM Disclosure Schedule, enter into
    (including via any acquisition) any new line of business which
    represents a material change in the operations of XM and its
    Subsidiaries and which is material to XM and its Subsidiaries,
    taken as a whole, (ii) make any material change to its or
    its Subsidiaries businesses, except as required by
    applicable legal requirements, (iii) enter into, terminate
    or fail to renew any material lease, contract, license or
    agreement, or make any change to any existing material leases,
    contracts, licenses or agreements other than in the ordinary
    course of business or consistent with past practice or
    (iv) make any capital expenditures, other than capital
    expenditures which, in the aggregate, do not exceed the
    aggregate
    
    A-21
 
    amount for capital expenditures specified in XMs long-term
    plan for 2007 and 2008 (a true and complete copy of which has
    been provided to Sirius prior to the date of this Agreement).
 
    (b) Dividends; Changes in
    Stock.  Except as set forth in
    Section 4.1(b) of the XM Disclosure Schedule, XM shall not,
    nor shall it permit any of its Subsidiaries to, or propose to,
    (i) declare or pay any dividends on or make other
    distributions in respect of any of its capital stock, except for
    dividends by a wholly-owned Subsidiary of XM, (ii) split,
    combine or reclassify any of its capital stock or issue or
    authorize or propose the issuance or authorization of any other
    securities in respect of, in lieu of or in substitution for,
    shares of its capital stock, or (iii) repurchase, redeem or
    otherwise acquire, or permit any Subsidiary to redeem, purchase
    or otherwise acquire, any shares of its capital stock or any
    securities convertible into or exercisable for any shares of its
    capital stock.
 
    (c) Issuance of Securities.  Except
    as set forth in Section 4.1(c) of the XM Disclosure
    Schedule, and except for issuances of XM Common Stock,
    restricted stock or rights or options to acquire XM Common Stock
    in the ordinary course of business consistent with past practice
    up to an aggregate amount set forth in Section 4.1(c) of
    the XM Disclosure Schedule, XM shall not, nor shall it permit
    any of its Subsidiaries to, issue, deliver or sell, or authorize
    or propose the issuance, delivery or sale of, any shares of its
    capital stock of any class, any Voting Debt, any stock
    appreciation rights, or any securities convertible into or
    exercisable or exchangeable for, or any rights, warrants or
    options to acquire, any such shares or Voting Debt, or enter
    into any agreement with respect to any of the foregoing, other
    than (i) the issuance of XM Common Stock required to be
    issued upon the exercise or settlement of XM Stock Awards
    outstanding on the date hereof in accordance with the terms of
    the applicable XM Stock Award, and (ii) issuances by a
    wholly owned Subsidiary of its capital stock to its parent or to
    another wholly-owned Subsidiary of XM.
 
    (d) Governing Documents, Etc.  XM
    shall not amend or propose to amend its Certificate of
    Incorporation or By-laws or, except as permitted pursuant to
    Section 4.1(e) or (f), enter into, or permit any Subsidiary
    to enter into, a plan of consolidation, merger or reorganization
    with any person other than a wholly-owned Subsidiary of XM.
 
    (e) No Acquisitions.  Other than
    acquisitions (whether by means of merger, share exchange,
    consolidation, tender offer, asset purchase or otherwise) and
    other business combinations (collectively,
    Acquisitions) that (A) would not
    reasonably be expected to delay, impede or affect the
    consummation of the transactions contemplated by this Agreement
    in the manner contemplated hereby and (B) for which the
    fair market value of the total consideration paid by XM and its
    Subsidiaries in such Acquisitions does not exceed in the
    aggregate the amount set forth in Section 4.1(e) of the XM
    Disclosure Schedule, XM shall not, and shall not permit any of
    its Subsidiaries to, acquire or agree to acquire, by merging or
    consolidating with, by purchasing a substantial equity interest
    in or a substantial portion of the assets of, by forming a
    partnership or joint venture with, or by any other manner, any
    business or any corporation, partnership, association or other
    business organization or division thereof or otherwise acquire
    or agree to acquire any assets, rights or properties;
    provided, however, that the foregoing shall not
    prohibit (i) internal reorganizations or consolidations
    involving existing Subsidiaries that would not present a
    material risk of any delay in the receipt of any Requisite
    Regulatory Approval (as defined in Section 6.1(c)) or
    (ii) the creation of new Subsidiaries organized to conduct
    or continue activities otherwise permitted by this Agreement.
 
    (f) No Dispositions.  Other than
    (i) internal reorganizations or consolidations involving
    existing Subsidiaries that would not present a material risk of
    any material delay in the receipt of any Requisite Regulatory
    Approval, (ii) dispositions disclosed in
    Section 4.1(f) of the XM Disclosure Schedule, and
    (iii) other dispositions of assets (including Subsidiaries)
    if the fair market value of the total consideration received
    therefrom does not exceed in the aggregate the amount set forth
    in Section 4.1(f) of the XM Disclosure Schedule, XM shall
    not, and shall not permit any of its Subsidiaries to, sell,
    lease, assign, encumber or otherwise dispose of, or agree to
    sell, lease, assign, encumber or otherwise dispose of, any of
    its assets, rights or properties (including capital stock of its
    Subsidiaries and indebtedness of others held by XM and its
    Subsidiaries) which are material, individually or in the
    aggregate, to XM.
 
    (g) Indebtedness.  XM shall not,
    and shall not permit any of its Subsidiaries to, incur, create
    or assume any long term indebtedness for borrowed money (or
    modify any of the material terms of any such outstanding
    
    A-22
 
    long-term indebtedness), guarantee any such long term
    indebtedness or issue or sell any long term debt securities or
    warrants or rights to acquire any long term debt securities of
    XM or any of its Subsidiaries or guarantee any long term debt
    securities of others, other than (i) in replacement of
    existing or maturing debt, (ii) indebtedness of any
    Subsidiary of XM to XM or to another Subsidiary of XM, or
    (iii) indebtedness that does not exceed in the aggregate
    the amount set forth in Section 4.1(g) of the XM Disclosure
    Schedule.
 
    (h) Other Actions.  XM shall not,
    and shall not permit any of its Subsidiaries to, intentionally
    take any action that would, or reasonably might be expected to,
    result in any of its representations and warranties set forth in
    this Agreement being or becoming untrue, subject to such
    exceptions as do not have, and would not reasonably be expected
    to have, individually or in the aggregate, a material adverse
    effect on XM or Sirius following the Effective Time, or in any
    of the conditions to the Merger set forth in Article VI not
    being satisfied or in a violation of any provision of this
    Agreement, or (unless such action is required by applicable law)
    which would materially adversely affect the ability of the
    parties to obtain any of the Requisite Regulatory Approvals
    without taking any action of the type referred to in
    Section 5.3(b)(i).
 
    (i) Accounting Methods; Tax
    Matters.  Except as disclosed in any XM SEC
    Document filed prior to the date of this Agreement, XM shall not
    change its methods of accounting in effect at December 31,
    2005, except as required by generally accepted accounting
    principles as concurred in by XMs independent auditors. XM
    shall not (i) change its annual tax accounting period and
    (ii) make any tax election that, individually or in the
    aggregate, would reasonably be likely to have a material adverse
    effect on XM or Sirius after the Effective Time.
 
    (j) Tax Free Qualification.  XM
    shall not, and shall not permit any of its Subsidiaries to,
    intentionally take or cause to be taken any action, whether
    before or after the Effective Time, which would reasonably be
    expected to prevent or impede the Merger from qualifying as a
    reorganization within the meaning of Section 368(a) of the
    Code.
 
    (k) Compensation and Benefit
    Plans.  During the period from the date of
    this Agreement and continuing until the Effective Time, XM
    agrees as to itself and its Subsidiaries that, except as set
    forth in Section 4.1(k) of the XM Disclosure Schedule, it
    will not: (i) other than in the ordinary course of business
    consistent with past practice, enter into, adopt, amend (except
    for such amendments as may be required by law) or terminate any
    XM Benefit Plan, (ii) except as required by any XM Benefit
    Plan as in effect as of the date hereof and except for normal
    payments, awards and increases in the ordinary course of
    business consistent with past practice, increase in any manner
    the compensation or fringe benefits of any director, officer,
    employee, independent contractor or consultant or pay any
    benefit not required by any XM Benefit Plan as in effect as of
    the date hereof or enter into any contract, agreement,
    commitment or arrangement to do any of the foregoing,
    (iii) enter into or renew any contract, agreement,
    commitment or arrangement (other than a renewal occurring in
    accordance with the terms of an XM Benefit Plan) providing for
    the payment to any director, officer, employee, independent
    contractor or consultant of compensation or benefits contingent,
    or the terms of which are materially altered, upon the
    occurrence of any of the transactions contemplated by this
    Agreement, or (iv) provide, with respect to the grant of
    any stock option, restricted stock, restricted stock unit or
    other equity-related award on or after the date hereof to the
    extent permitted by Section 4.1(c), that the vesting of any
    such stock option, restricted stock, restricted stock unit or
    other equity-related award shall accelerate or otherwise be
    affected by the occurrence of any of the transactions
    contemplated by this Agreement.
 
    (l) No Liquidation.  XM shall not,
    and shall not permit any of its Significant Subsidiaries to,
    adopt a plan of complete or partial liquidation or resolutions
    providing for or authorizing such a liquidation or a
    dissolution, restructuring, recapitalization or reorganization.
 
    (m) Litigation.  XM shall not, and
    shall not permit any of its Subsidiaries to, settle or
    compromise any litigation other than settlements or compromises
    of litigation where the amount paid (less the amount reserved
    for such matters by XM) in settlement or compromise, in
    each case, does not exceed an amount set forth in
    Section 4.1(m) of the XM Disclosure Schedule.
 
    (n) No Restrictions on
    Business.  XM shall not, and shall not permit
    any of its Subsidiaries to, enter into or otherwise become party
    to any contract, arrangement, commitment or understanding that
    will restrict or
    
    A-23
 
    limit, in any material respect, the ability of XM or any of its
    Subsidiaries or affiliates from conducting, from and after the
    Closing, any of their businesses in any geographical area, other
    than any contract, arrangement, commitment or understanding
    terminable in full (including the restrictions and limitations
    on conduct of business) on notice of not more than 45 days
    by XM or a Subsidiary thereof without the incurrence of any
    liability (including an incurrence of an obligation to make any
    payment of any amount in respect of such termination).
 
    (o) Other Agreements.  XM shall
    not, and shall not permit any of its Subsidiaries to, agree to,
    or make any commitment to, take, or authorize, any of the
    actions prohibited by this Section 4.1.
 
    4.2  Covenants of
    Sirius.  During the period from the date
    of this Agreement and continuing until the Effective Time,
    Sirius agrees as to itself and its Subsidiaries that, except as
    expressly contemplated or permitted by this Agreement or to the
    extent that XM shall otherwise consent in writing, which consent
    shall not be unreasonably withheld or delayed:
 
    (a) Ordinary Course.  Sirius and
    its Subsidiaries shall carry on their respective businesses in
    the usual, regular and ordinary course consistent with past
    practice and use all reasonable efforts to preserve intact their
    present business organizations, maintain their rights,
    franchises, licenses and other authorizations issued by
    Governmental Entities and preserve their relationships with
    employees, customers, suppliers and others having business
    dealings with them to the end that their goodwill and ongoing
    businesses shall not be impaired in any material respect at the
    Effective Time. Sirius shall not, nor shall it permit any of its
    Subsidiaries to, (i) except as disclosed in the Sirius SEC
    Documents prior to the date of this Agreement, enter into
    (including via any acquisition) any new line of business which
    represents a material change in the operations of Sirius and its
    Subsidiaries and which is material to Sirius and its
    Subsidiaries, taken as a whole, (ii) make any material
    change to its or its Subsidiaries businesses, except as
    required by applicable legal requirements, (iii) enter
    into, terminate or fail to renew any material lease, contract,
    license or agreement, or make any change to any existing
    material leases, contracts, licenses or agreements other than in
    the ordinary course of business or consistent with past practice
    or (iv) make any capital expenditures, other than capital
    expenditures which, in the aggregate, do not exceed the
    aggregate amount for capital expenditures specified in
    Siriuss long-term plan for 2007 and 2008 (a true and
    complete copy of which has been provided to XM prior to the date
    of this Agreement).
 
    (b) Dividends; Changes in
    Stock.  Except as set forth in
    Section 4.2(b) of the Sirius Disclosure Schedule, Sirius
    shall not, nor shall it permit any of its Subsidiaries to, or
    propose to, (i) declare or pay any dividends on or make
    other distributions in respect of any of its capital stock,
    except for dividends by a wholly owned Subsidiary of Sirius,
    (ii) split, combine or reclassify any of its capital stock
    or issue or authorize or propose the issuance or authorization
    of any other securities in respect of, in lieu of or in
    substitution for, shares of its capital stock, or
    (iii) repurchase, redeem or otherwise acquire, or permit
    any Subsidiary to redeem, purchase or otherwise acquire, any
    shares of its capital stock or any securities convertible into
    or exercisable for any shares of its capital stock.
 
    (c) Issuance of Securities.  Except
    as set forth in Section 4.2(c) of the Sirius Disclosure
    Schedule, and except for issuances of Sirius Common Stock,
    restricted stock or rights or options to acquire Sirius Common
    Stock in the ordinary course of business consistent with past
    practice up to an aggregate amount set forth in
    Section 4.2(c) of the Sirius Disclosure Schedule. Sirius
    shall not, nor shall it permit any of its Subsidiaries to,
    issue, deliver or sell, or authorize or propose the issuance,
    delivery or sale of, any shares of its capital stock of any
    class, any Voting Debt, any stock appreciation rights or any
    securities convertible into or exercisable or exchangeable for,
    or any rights, warrants or options to acquire, any such shares
    or Voting Debt, or enter into any agreement with respect to any
    of the foregoing, other than (i) the issuance of Sirius
    Common Stock required to be issued upon the exercise or
    settlement of Sirius Stock Awards outstanding on the date hereof
    in accordance with the terms of the applicable Sirius Stock
    Award, and (ii) issuances by a wholly owned Subsidiary of
    its capital stock to its Sirius or to another wholly-owned
    Subsidiary of Sirius.
 
    (d) Governing Documents.  Except
    for the Sirius Charter Amendment and except as contemplated in
    Section 5.10, Sirius shall not amend or propose to amend
    its Certificate of Incorporation or By-laws or, except
    
    A-24
 
    as permitted pursuant to Section 4.2(e) or 4.2(f), enter
    into, or permit any Subsidiary to enter into, a plan of
    consolidation, merger or reorganization with any person other
    than a wholly-owned Subsidiary of Sirius.
 
    (e) No Acquisitions.  Other than
    Acquisitions that (A) would not reasonably be expected to
    delay, impede or affect the consummation of the transactions
    contemplated by this Agreement in the manner contemplated hereby
    and (B) for which the fair market value of the total
    consideration paid by Sirius and its Subsidiaries in such
    Acquisitions does not exceed in the aggregate the amount set
    forth in Section 4.2(e) of the Sirius Disclosure Schedule,
    Sirius shall not, and shall not permit any of its Subsidiaries
    to, acquire or agree to acquire, by merging or consolidating
    with, by purchasing a substantial equity interest in or a
    substantial portion of the assets of, by forming a partnership
    or joint venture with, or by any other manner, any business or
    any corporation, partnership, association or other business
    organization or division thereof or otherwise acquire or agree
    to acquire any assets, rights or properties; provided,
    however, that the foregoing shall not prohibit
    (i) internal reorganizations or consolidations involving
    existing Subsidiaries that would not present a material risk of
    any material delay in the receipt of any Requisite Regulatory
    Approval or (ii) the creation of new Subsidiaries organized
    to conduct or continue activities otherwise permitted by this
    Agreement.
 
    (f) No Dispositions.  Other than
    (i) internal reorganizations or consolidations involving
    existing Subsidiaries that would not present a material risk of
    any material delay in the receipt of any Requisite Regulatory
    Approval, (ii) dispositions disclosed in
    Section 4.2(f) of the Sirius Disclosure Schedule, and
    (iii) other dispositions of assets (including Subsidiaries)
    if the fair market value of the total consideration received
    therefrom does not exceed in the aggregate the amount set forth
    in Section 4.2(f) of the Sirius Disclosure Schedule, Sirius
    shall not, and shall not permit any of its Subsidiaries to,
    sell, lease, assign, encumber or otherwise dispose of, or agree
    to sell, lease, assign, encumber or otherwise dispose of, any of
    its assets, rights or properties (including capital stock of its
    Subsidiaries and indebtedness of others held by Sirius and its
    Subsidiaries) which are material, individually or in the
    aggregate, to Sirius.
 
    (g) Indebtedness.  Sirius shall
    not, and shall not permit any of its Subsidiaries to, incur,
    create or assume any long term indebtedness for borrowed money
    (or modify any of the material terms of any such outstanding
    long-term indebtedness), guarantee any such long term
    indebtedness or issue or sell any long term debt securities or
    warrants or rights to acquire any long term debt securities of
    Sirius or any of its Subsidiaries or guarantee any long term
    debt securities of others, other than (i) in replacement of
    existing or maturing debt, (ii) indebtedness of any
    Subsidiary of Sirius to Sirius or to another Subsidiary of
    Sirius, or (iii) indebtedness that does not exceed in the
    aggregate the amount set forth in Section 4.2(g) of the
    Sirius Disclosure Schedule.
 
    (h) Other Actions.  Sirius shall
    not, and shall not permit any of its Subsidiaries to,
    intentionally take any action that would, or reasonably might be
    expected to, result in any of its representations and warranties
    set forth in this Agreement being or becoming untrue, subject to
    such exceptions as do not have, and would not reasonably be
    expected to have, individually or in the aggregate, a material
    adverse effect on Sirius following the Effective Time, or in any
    of the conditions to the Merger set forth in Article VI not
    being satisfied or in a violation of any provision of this
    Agreement, or (unless such action is required by applicable law)
    which would materially adversely affect the ability of the
    parties to obtain any of the Requisite Regulatory Approvals
    without taking any action of the type referred to in
    Section 5.3(b)(i).
 
    (i) Accounting Methods; Tax
    Matters.  Except as disclosed in any Sirius
    SEC Document filed prior to the date of this Agreement, Sirius
    shall not change its methods of accounting in effect at
    December 31, 2005, except as required by generally accepted
    accounting principles as concurred in by Siriuss
    independent auditors. Sirius shall not (i) change its
    annual tax accounting period and (ii) make any tax election
    that, individually or in the aggregate, would reasonably be
    likely to have a material adverse effect on Sirius after the
    Effective Time.
 
    (j) Tax Free Qualification.  Sirius
    shall not, and shall not permit any of its Subsidiaries to,
    intentionally take or cause to be taken any action, whether
    before or after the Effective Time, which would reasonably be
    expected to prevent or impede the Merger from qualifying as a
    reorganization within the meaning of Section 368(a) of the
    Code.
    
    A-25
 
 
    (k) Compensation and Benefit
    Plans.  During the period from the date of
    this Agreement and continuing until the Effective Time, Sirius
    agrees as to itself and its Subsidiaries that, except as set
    forth in Section 4.2(k) of the Sirius Disclosure Schedule,
    it will not: (i) other than in the ordinary course of
    business consistent with past practice, enter into, adopt, amend
    (except for such amendments as may be required by law) or
    terminate any Sirius Benefit Plan, (ii) except as required
    by any Sirius Benefit Plan as in effect as of the date hereof
    and except for normal payments, awards and increases in the
    ordinary course of business consistent with past practice,
    increase in any manner the compensation or fringe benefits of
    any director, officer, employee, independent contractor or
    consultant or pay any benefit not required by any Sirius Benefit
    Plan as in effect as of the date hereof or enter into any
    contract, agreement, commitment or arrangement to do any of the
    foregoing, (iii) enter into or renew any contract,
    agreement, commitment or arrangement (other than a renewal
    occurring in accordance with the terms of a Sirius Benefit Plan)
    providing for the payment to any director, officer, employee,
    independent contractor or consultant of compensation or benefits
    contingent, or the terms of which are materially altered, upon
    the occurrence of any of the transactions contemplated by this
    Agreement, or (iv) provide, with respect to the grant of
    any stock option, restricted stock, restricted stock unit or
    other equity-related award on or after the date hereof to the
    extent permitted by Section 4.2(c), that the vesting of any
    such stock option, restricted stock, restricted stock unit or
    other equity-related award shall accelerate or otherwise be
    affected by the occurrence of any of the transactions
    contemplated by this Agreement.
 
    (l) No Liquidation.  Sirius shall
    not, and shall not permit any of its Significant Subsidiaries
    to, adopt a plan of complete or partial liquidation or
    resolutions providing for or authorizing such a liquidation or a
    dissolution, restructuring, recapitalization or reorganization.
 
    (m) Litigation.  Sirius shall not,
    and shall not permit any of its Subsidiaries to, settle or
    compromise any litigation other than settlements or compromises
    of litigation where the amount paid (less the amount reserved
    for such matters by Sirius) in settlement or compromise, in each
    case, does not exceed an amount set forth in Section 4.2(m)
    of the Sirius Disclosure Schedule.
 
    (n) No Restrictions on
    Business.  Sirius shall not, and shall not
    permit any of its Subsidiaries to, enter into or otherwise
    become party to any contract, arrangement, commitment or
    understanding that will restrict or limit, in any material
    respect, the ability of Sirius or any of its Subsidiaries or
    affiliates from conducting, from and after the Closing, any of
    their businesses in any geographical area, other than any
    contract, arrangement, commitment or understanding terminable in
    full (including the restrictions and limitations on conduct of
    business) on notice of not more than 45 days by Sirius or a
    Subsidiary thereof without the incurrence of any liability
    (including an incurrence of an obligation to make any payment of
    any amount in respect of such termination).
 
    (o) Other Agreements.  Sirius shall
    not, and shall not permit any of its Subsidiaries to, agree to,
    or make any commitment to, take, or authorize, any of the
    actions prohibited by this Section 4.2.
 
    4.3  Advice of Changes; Government
    Filings.  Each party shall confer on a
    regular and frequent basis with the other, and promptly advise
    the other orally and in writing of any change or event of which
    such party has knowledge having, or which would reasonably be
    expected to have, a material adverse effect on such party or
    which would cause or constitute a material breach of any of the
    representations, warranties or covenants of such party contained
    herein. Each party shall promptly advise the other orally and in
    writing of any material deficiencies in the internal controls
    over financial reporting (as defined in
    Rule 13a-15(f)
    of the Exchange Act) of such party identified by such party or
    its auditors. Each of XM and Sirius shall have the right to
    review in advance, and to the extent practicable, each will
    consult with the other, in each case subject to applicable laws
    relating to the exchange of information, with respect to all the
    information relating to the other party, and any of their
    respective Subsidiaries, which appears in any filing made with,
    or written materials submitted to, any third party or any
    Governmental Entity in connection with the transactions
    contemplated by this Agreement. In exercising the foregoing
    right, each of the parties hereto agrees to act reasonably and
    as promptly as practicable. Each party hereto agrees that to the
    extent practicable it will consult with the other party hereto
    with respect to the obtaining of all permits, consents,
    approvals and authorizations of all third parties and
    Governmental Entities necessary or advisable to consummate the
    transactions contemplated by this Agreement, and each party will
    keep the other party reasonably apprised of the status of
    matters relating to completion of the transactions contemplated
    hereby. Neither party nor any of its
    
    A-26
 
    Subsidiaries shall be required to provide access to or to
    disclose information where such access or disclosure would
    violate or prejudice the rights of its customers, jeopardize the
    attorney-client privilege of the institution in possession or
    control of such information or contravene any law, rule,
    regulation, order, judgment, decree or binding agreement entered
    into prior to the date of this Agreement. The parties will make
    appropriate substitute disclosure arrangements under
    circumstances in which the restrictions of the preceding
    sentence apply.
 
    4.4  Control of Other Partys
    Business.  Nothing contained in this
    Agreement shall give Sirius, directly or indirectly, the right
    to control or direct the operations of XM or shall give XM,
    directly or indirectly, the right to control or direct the
    operations of Sirius prior to the Effective Time. Prior to the
    Effective Time, each of XM and Sirius shall exercise, consistent
    with the terms and conditions of this Agreement, complete
    control and supervision over its and its Subsidiaries
    respective operations.
 
    ARTICLE V
    
 
    Additional Agreements
 
    5.1  Preparation of Proxy Statement;
    Stockholders Meetings.  (a)
    (i) Within 90 days from the date hereof, Sirius,
    Merger Co. and XM shall cooperate in preparing and shall cause
    to be filed with the SEC mutually acceptable proxy materials
    which shall constitute the proxy statement/prospectus relating
    to the matters to be submitted to the XM stockholders at the XM
    Stockholders Meeting (as defined in Section 5.1(b)) and to
    the Sirius stockholders at the Sirius Stockholders Meeting (as
    defined in Section 5.1(c)) (such joint proxy
    statement/prospectus, and any amendments or supplements thereto,
    the Joint Proxy Statement/Prospectus), and
    Sirius shall prepare, together with XM, and file with the SEC a
    registration statement on
    Form S-4
    (of which the Joint Proxy Statement/Prospectus shall be a part)
    with respect to the issuance of Sirius Common Stock in the
    Merger (such
    Form S-4,
    and any amendments or supplements thereto, the
    Form S-4).
 
    (ii) Each of Sirius and XM shall use reasonable best
    efforts to have the Joint Proxy Statement/Prospectus cleared by
    the SEC and the
    Form S-4
    declared effective by the SEC, to keep the
    Form S-4
    effective as long as is necessary to consummate the Merger and
    the other transactions contemplated hereby, and to mail the
    Joint Proxy Statement/Prospectus to their respective
    stockholders as promptly as practicable after the
    Form S-4
    is declared effective. Sirius and XM shall, as promptly as
    practicable after receipt thereof, provide the other party with
    copies of any written comments and advise the other party of any
    oral comments with respect to the Joint Proxy
    Statement/Prospectus or
    Form S-4
    received from the SEC. Each party shall cooperate and provide
    the other party with a reasonable opportunity to review and
    comment on any amendment or supplement to the Joint Proxy
    Statement/Prospectus and the
    Form S-4
    prior to filing such with the SEC, and each party will provide
    the other party with a copy of all such filings made with the
    SEC.
 
    (iii) None of the information supplied or to be supplied by
    XM or Sirius for inclusion or incorporation by reference in the
    (A) Form S-4
    will, at the time the
    Form S-4
    is filed with the SEC and at the time it becomes effective under
    the Securities Act, contain any untrue statement of a material
    fact or omit to state any material fact required to be stated
    therein or necessary to make the statements therein not
    misleading, and the (B) Joint Proxy Statement/Prospectus
    will, at the date of mailing to stockholders and at the times of
    the meetings of stockholders to be held in connection with the
    Merger, contain any untrue statement of a material fact or omit
    to state any material fact required to be stated therein or
    necessary in order to make the statements therein, in light of
    the circumstances under which they were made, not misleading.
    The Joint Proxy Statement/Prospectus will comply as to form in
    all material respects with the requirements of the Exchange Act
    and the rules and regulations of the SEC thereunder, except that
    no representation or warranty shall be made by either such party
    with respect to statements made or incorporated by reference
    therein based on information supplied by the other party for
    inclusion or incorporation by reference in the Joint Proxy
    Statement/Prospectus or
    Form S-4.
 
    (iv) XM and Sirius shall make any necessary filings with
    respect to the Merger under the Securities Act and the Exchange
    Act and the rules and regulations thereunder. Sirius shall use
    its reasonable best efforts to take any action required to be
    taken under any applicable state securities laws in connection
    with the Merger and each party shall furnish all information
    concerning it and the holders of its capital stock as may be
    reasonably requested in connection with any such action.
    
    A-27
 
 
    (v) Each party will advise the other party, promptly after
    it receives notice thereof, of the time when the
    Form S-4
    has become effective, the issuance of any stop order, the
    suspension of the qualification of the Sirius Common Stock
    issuable in connection with the Merger for offering or sale in
    any jurisdiction, or any request by the SEC for amendment of the
    Joint Proxy Statement/Prospectus or the
    Form S-4.
    If at any time prior to the Effective Time any information
    relating to either of the parties, or their respective
    affiliates, officers or directors, should be discovered by
    either party which should be set forth in an amendment or
    supplement to any of the
    Form S-4
    or the Joint Proxy Statement/Prospectus so that such documents
    would not include any misstatement of a material fact or omit to
    state any material fact necessary to make the statements
    therein, in light of the circumstances under which they were
    made, not misleading, the party which discovers such information
    shall promptly notify the other party hereto and, to the extent
    required by law, rules or regulations, an appropriate amendment
    or supplement describing such information shall be promptly
    filed with the SEC and disseminated to the stockholders of XM
    and Sirius.
 
    (vi) Except as otherwise set forth in this Agreement, no
    amendment or supplement (including by incorporation by
    reference) to the Joint Proxy Statement/Prospectus or the
    Form S-4
    shall be made without the approval of XM and Sirius, which
    approval shall not be unreasonably withheld or delayed;
    provided that XM, in connection with a Change in XM
    Recommendation, and Sirius, in connection with a Change in
    Sirius Recommendation, may amend or supplement the proxy
    statement for XM, the proxy statement for Sirius or the
    Form S-4
    (including by incorporation by reference) pursuant to a
    Qualifying Amendment to effect or reflect such change, and in
    such event, the right of approval set forth in this
    Section 5.1(a)(vi) shall not apply to such Qualifying
    Amendment; provided that the right of approval shall
    continue to apply with respect to such information relating to
    the other party or its business, financial condition or results
    of operations, subject to the right of each party to have its
    Board of Directors deliberations and conclusions be
    accurately described. A Qualifying Amendment
    means an amendment or supplement to the proxy statement for XM,
    the proxy statement for Sirius or the
    Form S-4
    (including by incorporation by reference) which effects or
    reflects a Change in XM Recommendation or a Change in Sirius
    Recommendation (as the case may be); provided that any such
    amendment or supplement is limited to (A) a Change in XM
    Recommendation or a Change in Sirius Recommendation (as the case
    may be), (B) a discussion of the reasons of the Board of
    Directors of XM or Sirius (as the case may be) for making such
    Change in XM Recommendation or Change in Sirius Recommendation
    (as the case may be) and (C) background information
    regarding the XM Board of Directors or Sirius Board of
    Directors (as the case may be) deliberations and
    conclusions relating to the Change in XM Recommendation or
    Change in Sirius Recommendation (as the case may be) or other
    factual information reasonably related thereto.
 
    (b) XM shall duly take all lawful action to call, give
    notice of, convene and hold a meeting of its stockholders as
    promptly as practicable, and in any event within 45 days,
    following the date upon which the
    Form S-4
    becomes effective (the XM Stockholders
    Meeting) for the purpose of obtaining the Required XM
    Vote with respect to the transactions contemplated by this
    Agreement and, unless it is permitted to make a Change in XM
    Recommendation (as defined below) pursuant to
    Section 5.4(b), shall use all reasonable best efforts to
    solicit the adoption of this Agreement by its stockholders in
    accordance with applicable legal requirements. The Board of
    Directors of XM shall include the XM Recommendation in the Joint
    Proxy Statement/Prospectus and shall not (x) withdraw or
    modify in any manner adverse to Sirius, the XM Recommendation or
    (y) publicly propose to, or publicly announce that the
    Board of Directors of XM has resolved to, take any such action
    (any of the foregoing, a Change in XM
    Recommendation), except as and to the extent expressly
    permitted by Section 5.4(b). Notwithstanding any Change in
    XM Recommendation, unless earlier terminated in accordance with
    Section 7.1, this Agreement shall be submitted to the
    stockholders of XM at the XM Stockholders Meeting for the
    purpose of adopting this Agreement and nothing contained herein
    shall be deemed to relieve XM of such obligation.
 
    (c) Sirius shall duly take all lawful action to call, give
    notice of, convene and hold a meeting of its stockholders as
    promptly as practicable, and in any event within 45 days,
    following the date upon which the
    Form S-4
    becomes effective (the Sirius Stockholders
    Meeting and, together with the XM Stockholders
    Meeting, the Required Stockholders Meetings)
    for the purpose of obtaining the Required Sirius Votes with
    respect to the transactions contemplated by this Agreement and,
    unless it is permitted to make a Change in Sirius Recommendation
    (as defined below) pursuant to Section 5.4(b), shall use
    all reasonable best efforts to solicit the approval of its
    stockholders of the Sirius Share Issuance and the Sirius Charter
    Amendment in accordance with applicable legal requirements. The
    Board of Directors of Sirius shall include the Sirius
    Recommendation in the Joint Proxy Statement/Prospectus and
    
    A-28
 
    shall not (x) withdraw or modify in any manner adverse to
    XM, the Sirius Recommendation or (y) publicly propose to,
    or publicly announce that the Board of Directors of Sirius has
    resolved to, take any such action (a Change in Sirius
    Recommendation), except as and to the extent expressly
    permitted by Section 5.4(b). Notwithstanding any Change in
    Sirius Recommendation, unless earlier terminated in accordance
    with Section 7.1, this Agreement shall be submitted to the
    stockholders of Sirius at the Sirius Stockholders Meeting for
    the purpose of approving the matters comprising the Required
    Sirius Votes and nothing contained herein shall be deemed to
    relieve Sirius of such obligation.
 
    (d) XM and Sirius shall each use its reasonable best
    efforts to cause the XM Stockholders Meeting and the Sirius
    Stockholders Meeting to be held on the same date.
 
    5.2  Access to Information;
    Confidentiality.  (a) Upon reasonable
    notice, XM and Sirius shall each (and shall cause each of their
    respective Subsidiaries to) afford to the representatives of the
    other, access, during normal business hours during the period
    prior to the Effective Time, to all its properties, books,
    contracts, records and officers and, during such period, each of
    XM and Sirius shall (and shall cause each of their respective
    Subsidiaries to) make available to the other such information
    concerning its business, properties and personnel as such other
    party may reasonably request. Neither party nor any of its
    Subsidiaries shall be required to provide access to or to
    disclose information where such access or disclosure would
    violate or prejudice the rights of its customers, jeopardize the
    attorney-client privilege of the institution in possession or
    control of such information or contravene any law, rule,
    regulation, order, judgment, decree or binding agreement entered
    into prior to the date of this Agreement. The parties will make
    appropriate substitute disclosure arrangements under
    circumstances in which the restrictions of the preceding
    sentence apply, including adopting additional specific
    procedures to protect the confidentiality of certain sensitive
    material and to ensure compliance with Applicable Antitrust
    Laws, and, if necessary, restricting review of certain sensitive
    material to the receiving partys financial advisors or
    outside legal counsel.
 
    (b) The parties will hold any such information which is
    nonpublic in confidence to the extent required by, and in
    accordance with, the provisions of the letter agreement, dated
    February 12, 2007, between Sirius and XM (the
    Confidentiality Agreement), which
    Confidentiality Agreement will remain in full force and effect.
 
    (c) No such investigation by either Sirius or XM shall
    affect the representations and warranties of the other.
 
    5.3  Reasonable Best
    Efforts.  (a) Subject to the terms
    and conditions of this Agreement, each party will use its
    reasonable best efforts to take, or cause to be taken, all
    actions and to do, or cause to be done, all things necessary,
    proper or advisable under this Agreement and applicable laws,
    rules and regulations to consummate the Merger and the other
    transactions contemplated by this Agreement as soon as
    practicable after the date hereof, including preparing and
    filing as promptly as practicable all documentation to effect
    all necessary applications, notices, filings and other documents
    and to obtain as promptly as practicable all Requisite
    Regulatory Approvals (as defined herein) and all other consents,
    waivers, orders, approvals, permits, rulings, authorizations and
    clearances necessary or advisable to be obtained from any third
    party or any Governmental Entity in order to consummate the
    Merger or any of the other transactions contemplated by this
    Agreement. In furtherance and not in limitation of the
    foregoing, each party hereto agrees (A) to make, as
    promptly as practicable, to the extent it has not already done
    so, (1) an appropriate filing of a Notification and Report
    Form pursuant to the HSR Act with respect to the transactions
    contemplated hereby (which filing shall be made in any event
    within 15 business days of the date hereof),
    (2) appropriate filings with the applicable Governmental
    Entities under any Applicable Antitrust Laws within the time
    periods specified thereunder to effect a Closing as soon as
    practicable and (3) appropriate filings and applications to
    the FCC for its consent to the transaction contemplated hereby
    (which filing shall be made in any event within 20 business days
    of the date hereof), and (B) in each case, to supply as
    promptly as practicable any additional information and
    documentary material that may be requested pursuant to such
    Applicable Antitrust Laws or by such authorities and to use
    reasonable best efforts to cause the expiration or termination
    of the applicable waiting periods under the HSR Act and the
    receipt of all such consents, waivers, orders, approvals,
    permits, rulings, authorizations and clearances under such other
    Applicable Antitrust Laws or from such authorities as soon as
    practicable.
 
    (b) Notwithstanding the foregoing or any other provision in
    this Agreement to the contrary, nothing in this Section 5.3
    shall require, or be deemed to require, (i) Sirius or XM
    (or any of their respective Subsidiaries) to take
    
    A-29
 
    any action, agree to take any action or consent to the taking of
    any action (including with respect to selling, holding separate
    or otherwise disposing of any business or assets or conducting
    its (or its Subsidiaries) business in any specified
    manner) if doing so would, individually or in the aggregate,
    reasonably be expected to result in a material adverse effect on
    Sirius after the Effective Time, or (ii) Sirius or XM (or
    any of their respective Subsidiaries) to take any such action
    that is not conditioned on the consummation of the Merger.
    Neither party shall take or agree to take any action identified
    in clause (i) or (ii) of the preceding sentence
    without the prior written consent of the other party.
 
    (c) Each of Sirius and XM shall, in connection with the
    efforts referenced in Section 5.3(a), use its reasonable
    best efforts to (i) cooperate in all respects with each
    other in connection with any filing or submission and in
    connection with any investigation or other inquiry, including
    any proceeding initiated by a private party, (ii) promptly
    inform the other party of the status of any of the matters
    contemplated hereby, including providing the other party with a
    copy of any written communication (or summary of oral
    communications) received by such party from, or given by such
    party to, the Antitrust Division of the Department of Justice,
    the Federal Trade Commission, FCC or any other Governmental
    Entity and of any written communication (or summary of oral
    communications) received or given in connection with any
    proceeding by a private party, in each case regarding any of the
    transactions contemplated hereby, and (iii) to the extent
    practicable, consult with each other in advance of any meeting
    or conference with any such Governmental Entity or, in
    connection with any proceeding by a private party, with any such
    other person, and to the extent permitted by any such
    Governmental Entity or other person, give the other party the
    opportunity to attend and participate in such meetings and
    conferences.
 
    (d) In furtherance and not in limitation of the covenants
    of the parties contained in this Section 5.3, if
    (i) any objections are asserted with respect to the
    transactions contemplated hereby under any law, rule,
    regulation, order or decree, (ii) any administrative or
    judicial action or proceeding is instituted (or threatened to be
    instituted) by any Governmental Entity or private party
    challenging the Merger or the other transactions contemplated
    hereby as violative of any law, rule, regulation, order or
    decree or which would otherwise prevent, delay or impede the
    consummation, or otherwise materially reduce the contemplated
    benefits, of the Merger or the other transactions contemplated
    hereby, or (iii) any law, rule, regulation, order or decree
    is enacted, entered, promulgated or enforced by a Governmental
    Entity which would make the Merger or the other transactions
    contemplated hereby illegal or would otherwise prevent, delay or
    impede the consummation, or otherwise materially reduce the
    contemplated benefits, of the Merger or the other transactions
    contemplated hereby, then each of XM and Sirius shall use its
    reasonable best efforts to resolve any such objections, actions
    or proceedings so as to permit the consummation of the
    transactions contemplated by this Agreement, including, subject
    to Section 5.3(b), selling, holding separate or otherwise
    disposing of or conducting its or its Subsidiaries
    business or asset in a specified manner, or agreeing to sell,
    hold separate or otherwise dispose of or conduct its or its
    Subsidiaries business or assets in a specified manner,
    which would resolve such objections, actions or proceedings.
 
    (e) In furtherance and not in limitation of the covenants
    of the parties contained in this Section 5.3, but subject
    to first complying with the obligations of Section 5.3(d),
    if any of the events specified in Section 5.3(d)(ii) or
    (iii) occurs, then each of Sirius and XM shall cooperate in
    all respects with each other and use its reasonable best
    efforts, subject to Section 5.3(b), to contest and resist
    any such administrative or judicial action or proceeding and to
    have vacated, lifted, reversed or overturned any judgment,
    injunction or other decree or order, whether temporary,
    preliminary or permanent, that is in effect and that prevents,
    materially delays or materially impedes the consummation, or
    otherwise materially reduces the contemplated benefits, of the
    Merger or the other transactions contemplated by this Agreement
    and to have such law, rule, regulation, order or decree
    repealed, rescinded or made inapplicable so as to permit
    consummation of the transactions contemplated by this Agreement,
    and each of Sirius and XM shall use its reasonable best efforts
    to defend, at its own cost and expense, any such administrative
    or judicial actions or proceedings.
 
    (f) Notwithstanding the foregoing or any other provision of
    this Agreement, nothing in this Section 5.3 shall limit a
    partys right to terminate this Agreement pursuant to
    Section 7.1(b) or 7.1(c) so long as such party has
    otherwise complied with its obligations under this
    Section 5.3 prior to such termination.
 
    (g) Sirius shall agree to execute and deliver, at or prior
    to the Effective Time, supplemental indentures, loan amendments
    and other instruments required for the due assumption, as
    determined by the parties hereto, of XMs
    
    A-30
 
    outstanding debt, guarantees and other securities to the extent
    required by the terms of such debt, guarantees and securities
    and the instruments and agreements relating thereto, and XM
    shall assist Sirius in accomplishing the same.
 
    (h) Each of XM and Sirius and their respective Boards of
    Directors shall, if any moratorium, control
    share, fair price or other anti-takeover law
    or regulation becomes applicable to this Agreement, the Merger,
    or any other transactions contemplated hereby, use its
    reasonable best efforts to ensure that the Merger and the other
    transactions contemplated by this Agreement may be consummated
    as promptly as practicable on the terms contemplated hereby and
    otherwise to minimize the effect of such law or regulation on
    this Agreement, the Merger and the other transactions
    contemplated hereby.
 
    5.4  Acquisition
    Proposals.  (a) Each of Sirius and XM
    agrees that neither it nor any of its Subsidiaries nor any of
    the officers and directors of it or its Subsidiaries shall, and
    that it shall use its reasonable best efforts to cause its and
    its Subsidiaries employees, agents and representatives
    (including any investment banker, attorney or accountant
    retained by it or any of its Subsidiaries) not to, directly or
    indirectly, (i) initiate, solicit, encourage or knowingly
    facilitate the making of any proposal or offer with respect to,
    or a transaction to effect, a merger, reorganization, share
    exchange, consolidation, business combination, recapitalization,
    liquidation, dissolution or similar transaction involving it or
    any of its Significant Subsidiaries (other than any such
    transaction permitted by Section 4.1(e) or (f) in the
    case of XM, and Section 4.2(e) or (f) in the case of
    Sirius) or any purchase or sale of 15% or more of the
    consolidated assets (including, without limitation, stock of its
    Subsidiaries) of it and its Subsidiaries, taken as a whole, or
    any purchase or sale of, or tender or exchange offer for, its
    voting securities that, if consummated, would result in any
    person (or the stockholders of such person) beneficially owning
    securities representing 15% or more of its total voting power
    (or of the surviving parent entity in such transaction) of any
    of its Significant Subsidiaries (any such proposal, offer or
    transaction (other than a proposal or offer made by the other
    party to this Agreement) being hereinafter referred to as an
    Acquisition Proposal), (ii) have any
    discussions with or provide any confidential information or data
    to any person relating to an Acquisition Proposal, or engage in
    any negotiations concerning an Acquisition Proposal, or
    knowingly facilitate any effort or attempt to make or implement
    an Acquisition Proposal, or (iii) approve or recommend, or
    propose to approve or recommend, or execute or enter into, any
    letter of intent, agreement in principle, merger agreement,
    asset purchase or share exchange agreement, option agreement or
    other similar agreement related to any Acquisition Proposal or
    propose or agree to do any of the foregoing.
 
    (b) Notwithstanding anything in this Agreement to the
    contrary, either party to this Agreement or its respective Board
    of Directors shall be permitted to (A) to the extent
    applicable and being otherwise in compliance with this
    Section 5.4(b), comply with
    Rule 14d-9
    and
    Rule 14e-2
    promulgated under the Exchange Act with regard to an Acquisition
    Proposal, or make any disclosure that the Board of Directors may
    determine (after consultation with its outside legal counsel) is
    required to be made under applicable law, (B) effect a
    Change in XM Recommendation or a Change in Sirius Recommendation
    (as applicable, a Change in Recommendation),
    and (C) engage in any discussions or negotiations with, or
    provide any confidential information or data to, any person in
    response to an unsolicited bona fide written Acquisition
    Proposal by any such person first made after the date of this
    Agreement, if and only to the extent that,
 
    (i) in any such case referred to in clause (B) or
    (C) above, (I) such partys Required Stockholders
    Meeting shall not have occurred, (II) such party has
    complied in all material respects with this Section 5.4,
    and (III) its Board of Directors, after consultation with
    its outside legal counsel, determines in good faith that failure
    to take such action would be inconsistent with its fiduciary
    duties under applicable law,
 
    (ii) in the case of clause (B) above,
    (I) there has been a development, event or occurrence after
    the date of this Agreement (an Occurrence) as
    a result of which the Board of Directors, after consultation
    with its outside legal counsel and financial advisors,
    determines in good faith that failure to effect a Change in
    Recommendation would be inconsistent with its fiduciary duties
    under applicable law, (II) it has notified the other party
    to this Agreement, at least seven business days in advance of a
    date (in the case of a notification by XM, the Sirius
    Election Date, and in the case of a notification by
    Sirius, the XM Election Date) of its
    intention to effect a Change in Recommendation (a
    Notice of Recommendation Change), and
    furnished to the other party to this Agreement any material
    information possessed by it with respect to such Occurrence
    
    A-31
 
    (including, if the Occurrence is the receipt of an Acquisition
    Proposal from a third party, the material terms and conditions
    of such Acquisition Proposal, the identity of the party making
    such Acquisition Proposal and a copy of any relevant proposed
    transaction agreements with the party making such Acquisition
    Proposal and any other material documents received by it or its
    representatives in connection therewith), and (III) prior
    to effecting such a Change in Recommendation, it has (together
    with its financial and legal advisors) engaged in reasonable,
    good faith negotiations with the other party to this Agreement,
    and has considered in good faith, after consulting with its
    financial and legal advisors, any modifications to the terms and
    conditions of this Agreement proposed by the other party hereto
    to determine whether such modifications cause the Board of
    Directors to conclude that such Occurrence no longer requires a
    Change in Recommendation;
 
    (iii) in the case of clause (C) above, its Board
    of Directors, after consultation with outside legal counsel and
    financial advisors, concludes in good faith that there is a
    reasonable likelihood that such Acquisition Proposal constitutes
    or is reasonably likely to result in a Superior Proposal, and
    prior to providing any information or data to any person in
    connection with an Acquisition Proposal by any such person, its
    Board of Directors receives from such person an executed
    confidentiality agreement having provisions that are no less
    favorable to the party providing such information than those
    contained in the Confidentiality Agreement; provided that
    the provisions in such confidentiality agreement with respect to
    treatment of certain sensitive confidential information to
    ensure compliance with Applicable Antitrust Laws may differ due
    to the nature of the person or entity making such Acquisition
    Proposal.
 
    (c) Each of Sirius and XM shall notify the other party to
    this Agreement of any Acquisition Proposal received by, any
    information related to an Acquisition Proposal requested from,
    or any discussions with or negotiations by, it or any of its
    representatives, indicating, in connection with such notice, the
    identity of such person and the material terms and conditions of
    any such Acquisition Proposal or request for information
    (including a copy thereof if in writing and any related
    available documentation or correspondence), and in any event
    each of Sirius and XM shall provide written notice to the other
    party of any Acquisition Proposal, request for information or
    initiation of such discussions or negotiations within
    48 hours of such event. Each of Sirius and XM agrees that
    it will promptly keep the other party informed of the status and
    terms of any such Acquisition Proposal (including whether
    withdrawn or rejected), the status and nature of all information
    requested and delivered, and the status and terms of any such
    discussions or negotiations, and in any event each of Sirius and
    XM shall provide the other party with written notice of any
    material development thereto within 48 hours thereof. Each
    of Sirius and XM also agrees to provide the other party hereto
    with copies of any written information that it provides to the
    third party making the request therefor within 24 hours of
    the time it provides such information to such third party,
    unless the other party hereto (i) has already been provided
    with such information or (ii) is restricted from receiving
    such information to ensure compliance with Applicable Antitrust
    Laws; provided that in such case, such party shall inform
    the other party of the type of information to be provided to the
    third party making the request.
 
    (d) Each of Sirius and XM agrees that (i) it will and
    will cause its Subsidiaries, and its and their officers,
    directors, agents, representatives and advisors to, cease
    immediately and terminate any and all existing activities,
    discussions or negotiations with any third parties conducted
    heretofore with respect to any Acquisition Proposal, and
    (ii) it will not release any third party from, or waive any
    provisions of, any confidentiality or standstill agreement to
    which it or any of its Subsidiaries is a party with respect to
    any Acquisition Proposal. Each of Sirius and XM agrees that it
    will use reasonable best efforts to promptly inform its and its
    Subsidiaries respective directors, executive officers and
    financial and legal advisors of the obligations undertaken in
    this Section 5.4. Each party shall, if it has not already
    done so, promptly request, to the extent it has a contractual
    right to do so, that each person, if any, that has heretofore
    executed a confidentiality agreement within the six months prior
    to the date of this Agreement in connection with its
    consideration of any Acquisition Proposal to return or destroy
    all confidential information or data heretofore furnished to any
    person by or on behalf of it or any of its Subsidiaries.
 
    (e) Nothing in this Section 5.4 shall (x) permit
    either party to terminate this Agreement or (y) affect any
    other obligation of the parties under this Agreement. Neither
    party shall submit to the vote of its stockholders any
    Acquisition Proposal other than the Merger prior to the
    termination of this Agreement. XM shall not amend, modify or
    waive any provision of the Rights Agreement, and shall not take
    any action to redeem the Rights or render the Rights
    inapplicable to any transaction, other than the Merger, prior to
    any termination of this Agreement.
    
    A-32
 
 
    (f) For purposes of this Agreement, Superior
    Proposal means a bona fide written Acquisition
    Proposal which the Board of Directors of Sirius or XM, as the
    case may be, concludes in good faith, after consultation with
    its financial advisors and legal advisors, taking into account
    the legal, financial, regulatory, timing and other aspects of
    the proposal and the person making the proposal (including any
    break-up
    fees, expense reimbursement provisions and conditions to
    consummation): (i) is more favorable to the stockholders of
    Sirius or XM, as the case may be, from a financial point of
    view, than the transactions contemplated by this Agreement
    (after giving effect to any adjustments to the terms and
    provisions of this Agreement committed to in writing by Sirius
    or XM, as the case may be, in response to such Acquisition
    Proposal) and (ii) is fully financed or reasonably capable
    of being fully financed, reasonably likely to receive all
    required governmental approvals on a timely basis and otherwise
    reasonably capable of being completed on the terms proposed;
    provided that, for purposes of this definition of
    Superior Proposal, the term Acquisition Proposal
    shall have the meaning assigned to such term in
    Section 5.4(a), except that the reference to 15% or
    more in the definition of Acquisition Proposal
    shall be deemed to be a reference to a majority and
    Acquisition Proposal shall only be deemed to refer
    to a transaction involving Sirius or XM, as the case may be.
 
    5.5  Affiliates.  XM shall
    use all reasonable efforts to cause each person who is an
    affiliate (for purposes of Rule 145 under the
    Securities Act) to deliver to Sirius, as soon as reasonably
    practicable and in any event prior to the XM Stockholders
    Meeting, a written agreement, in form and substance reasonably
    satisfactory to Sirius, relating to required transfer
    restrictions on the Sirius Common Stock received by them in the
    Merger pursuant to Rule 145 under the Securities Act.
 
    5.6  Stock Exchange
    Listing.  Sirius shall use all reasonable
    efforts to cause (i) the shares of Sirius Common Stock to
    be issued in the Merger and (ii) the shares of Sirius
    Common Stock to be reserved for issuance upon the exercise,
    vesting or payment under any Converted Equity Award, to be
    approved for listing on NASDAQ, subject to official notice of
    issuance, prior to the Closing Date.
 
    5.7  Employee Benefit
    Plans.  Sirius and XM agree that, except
    as otherwise provided herein (including as set forth in
    Section 5.7 of the XM Disclosure Schedule or
    Section 5.7 of the Sirius Disclosure Schedule, as
    applicable) and unless otherwise mutually agreed in writing, the
    Sirius Benefit Plans and XM Benefit Plans in effect at the date
    of this Agreement shall remain in effect after the Effective
    Time with respect to employees covered by such plans at the
    Effective Time, and the parties shall negotiate in good faith to
    formulate Benefit Plans for Sirius and its Subsidiaries that,
    following the formulation of such Benefit Plans, shall provide
    benefits for services on a similar basis to employees who were
    covered by the Sirius Benefit Plans and XM Benefit Plans
    immediately prior to the Effective Time.
 
    5.8  Section 16
    Matters.  Assuming that XM delivers to
    Sirius the Section 16 Information (as defined below)
    reasonably in advance of the Effective Time, the Board of
    Directors of Sirius, or a committee of Non-Employee Directors
    thereof (as such term is defined for purposes of
    Rule 16b-3(d)
    under the Exchange Act), shall reasonably promptly thereafter
    and in any event prior to the Effective Time adopt a resolution
    providing that the receipt by the Insiders (as defined below) of
    Sirius Common Stock in exchange for shares of XM Common Stock,
    the receipt of Converted Options in exchange for XM Options, and
    the receipt of Converted Stock Awards in exchange for XM Stock
    Awards, in each case pursuant to the transactions contemplated
    hereby and to the extent such securities are listed in the
    Section 16 Information provided by XM to Sirius prior to
    the Effective Time, is intended to be exempt from liability
    pursuant to Section 16(b) under the Exchange Act such that
    any such receipt shall be so exempt. Section 16
    Information shall mean information accurate in all
    material respects regarding the Insiders, the number of shares
    of the capital stock held by each such Insider, and the number
    and description of options, stock appreciation rights,
    restricted shares and other stock-based awards held by each such
    Insider. Insiders shall mean those officers
    and directors of XM who are subject to the reporting
    requirements of Section 16(a) of the Exchange Act and who
    are listed in the Section 16 Information.
 
    5.9  Fees and
    Expenses.  Whether or not the Merger is
    consummated, all costs and expenses incurred in connection with
    this Agreement and the transactions contemplated hereby shall be
    paid by the party incurring such expense, except as otherwise
    provided in Section 7.2 and except that (a) if the
    Merger is consummated, the Surviving Corporation shall pay, or
    cause to be paid, any and all property or transfer taxes imposed
    on the parties hereto in connection with the Merger, and
    (b) expenses incurred in connection with filing, printing
    and mailing the Joint Proxy Statement/Prospectus and the
    Form S-4
    shall be shared equally by Sirius and XM.
    
    A-33
 
 
    5.10  Governance.
 
    (a) On or prior to the Effective Time, Siriuss Board
    of Directors shall take such actions as are necessary to amend
    its By-Laws to cause the number of directors that will comprise
    the Board of Directors of Sirius at the Effective Time to be 12
    persons. Immediately following the Effective Time, the Board of
    Directors of Sirius shall consist of: (i) four members
    selected by Sirius, each of whom shall qualify as an independent
    director pursuant to the NASDAQ Marketplace Rules in effect from
    time to time (an Independent Director) at all
    times that Sirius Common Stock is listed on NASDAQ;
    (ii) four members selected by XM, each of whom shall
    qualify as an Independent Director at all times that Sirius
    Common Stock is listed on NASDAQ; (iii) two members
    selected by XM, one of whom shall be a designee of General
    Motors and the other of whom shall be a designee of American
    Honda (the Designated Directors);
    (iv) the Chief Executive Officer of Sirius and (v) the
    Chairman of the Board of Directors. For all purposes hereunder,
    the Designated Directors shall not be deemed to qualify as
    Independent Directors. Prior to the Effective Time,
    Siriuss Board of Directors shall approve by a vote of at
    least two-thirds of the directors in office at such time the
    composition of Siriuss Board of Directors as set forth in
    this Section 5.10(a), effective immediately following the
    Effective Time.
 
    (b) On or prior to the Effective Time, the Sirius Board of
    Directors shall take such actions as are necessary to appoint
    Mel Karmazin as Chief Executive Officer of Sirius, effective as
    of the Effective Time. On or prior to the Effective Time, the
    Sirius Board of Directors shall take such actions as are
    necessary to appoint Gary M. Parsons as Chairman of the Board of
    Directors of Sirius, effective as of the Effective Time. In the
    event that either Mr. Karmazin or Mr. Parsons is or
    will be unable to serve in his designated position beginning as
    of the Effective Time, either as notified in writing to the
    parties by such individual prior to the Effective Time or as a
    result of such individuals death or disability, then the
    individual to replace Mr. Karmazin or Mr. Parsons, as
    the case may be (in either case, the
    Successor), shall be determined by joint
    agreement of the parties, each of whom shall cooperate in good
    faith with the other party and use its reasonable best efforts
    to identify, as promptly as practicable and in any event prior
    to the Effective Time, the appropriate Successor. In the event
    that the parties have been unable to identify and reach
    agreement with each other regarding a Successor within
    30 days after the occurrence of the event giving rise to
    the need to select such Successor (Deadlock),
    the parties shall follow the procedures set forth on
    Section 5.10(b) of each of the XM Disclosure Schedule and
    the Sirius Disclosure Schedule.
 
    (c) On or prior to the Effective Time, the Sirius Board of
    Directors shall take such actions as are necessary to establish
    three standing committees: a Nominating and Corporate Governance
    Committee, an Audit Committee and a Compensation Committee.
    Members of the Nominating and Corporate Governance Committee,
    Audit Committee and Compensation Committee shall qualify as
    Independent Directors. The Chairman of the Nominating and
    Corporate Governance Committee shall be selected by directors
    designated by Sirius. The Chairman of the Audit Committee and
    the Chairman of the Compensation Committee shall be selected by
    directors designated by Sirius and XM, with each designating one
    such chairman. The composition of the members of the Nominating
    and Corporate Governance Committee, Audit Committee and
    Compensation Committee, including the respective chairman of
    each such committee, shall be designated in equal shares by
    directors designated by Sirius and directors designated by XM.
 
    (d) On or prior to the Effective Time, the Sirius Board of
    Directors shall take such actions as are necessary to amend its
    By-Laws to provide that, for a period of two years following the
    Effective Time, (i) any termination or replacement of
    either the Chief Executive Officer or Chairman of the Board of
    Directors as of the Effective Time (or such individuals
    successor) and (ii) any sale, transfer or other disposition
    of assets, rights or properties which are material, individually
    or in the aggregate, to Sirius (or the execution of any
    agreement to take any such action), shall require the prior
    approval of a majority of the Independent Directors.
 
    5.11  Indemnification; Directors and
    Officers Insurance.  (a) From
    and after the Effective Time, the Surviving Corporation shall,
    to the fullest extent permitted by applicable law, indemnify,
    defend and hold harmless, and provide advancement of expenses
    to, each person who is now, or has been at any time prior to the
    date hereof or who becomes prior to the Effective Time, an
    officer, director or employee of XM or any of its Subsidiaries
    (the XM Indemnified Parties) against all
    losses, claims, damages, costs, expenses, liabilities or
    judgments or amounts that are paid in settlement of or in
    connection with any claim, action, suit, proceeding or
    investigation based in whole or in part on or arising in whole
    or in part out of the fact that such person is or was a
    director, officer or employee of XM
    
    A-34
 
    or any Subsidiary of XM, and pertaining to any matter existing
    or occurring, or any acts or omissions occurring, at or prior to
    the Effective Time, whether asserted or claimed prior to, or at
    or after, the Effective Time (including matters, acts or
    omissions occurring in connection with the approval of this
    Agreement and the consummation of the transactions contemplated
    hereby) to the same extent such persons are indemnified or have
    the right to advancement of expenses as of the date of this
    Agreement by XM pursuant to XMs Certificate of
    Incorporation, By-laws and indemnification agreements, if any,
    in existence on the date hereof with any directors, officers and
    employees of XM and its Subsidiaries.
 
    (b) For a period of six years after the Effective Time, the
    Surviving Corporation shall cause to be maintained in effect the
    current policies of directors and officers liability
    insurance maintained by XM (provided that the Surviving
    Corporation may substitute therefor policies with a
    substantially comparable insurer of at least the same coverage
    and amounts containing terms and conditions which are no less
    advantageous to the insured) with respect to claims arising from
    facts or events which occurred at or before the Effective Time;
    provided, however, that the Surviving Corporation
    shall not be obligated to make annual premium payments for such
    insurance to the extent such premiums exceed 300% of the
    premiums paid as of the date hereof by XM for such insurance
    (XMs Current Premium), and if such
    premiums for such insurance would at any time exceed 300% of
    XMs Current Premium, then the Surviving Corporation shall
    cause to be maintained policies of insurance which, in the
    Surviving Corporations good faith determination, provide
    the maximum coverage available at an annual premium equal to
    300% of XMs Current Premium.
 
    (c) The Surviving Corporation shall pay (as incurred) all
    expenses, including reasonable fees and expenses of counsel,
    which an indemnified person may incur in enforcing the indemnity
    and other obligations provided for in this Section 5.11.
 
    (d) If the Surviving Corporation or any of its successors
    or assigns (i) consolidates with or merges into any other
    person and shall not be the continuing or surviving corporation
    or entity of such consolidation or merger, or
    (ii) transfers or conveys all or substantially all of its
    properties and assets to any person, then, and in each such
    case, to the extent necessary, proper provision shall be made so
    that the successors and assigns of the Surviving Corporation, as
    the case may be, shall assume the obligations set forth in this
    Section 5.11.
 
    (e) The provisions of this Section 5.11 are intended
    to be for the benefit of, and shall be enforceable by, each
    Indemnified Party, his or her heirs and representatives and are
    in addition to, and not in substitution for, any other rights to
    indemnification or contribution that any such person may have by
    contract or otherwise.
 
    5.12  Public
    Announcements.  Sirius, Merger Co. and XM
    shall use reasonable best efforts (i) to develop a joint
    communications plan, (ii) to ensure that all press releases
    and other public statements with respect to the transactions
    contemplated hereby shall be consistent with such joint
    communications plan, and (iii) except in respect of any
    announcement required by applicable law or by obligations
    pursuant to any listing agreement with or rules of NASDAQ in
    which it is impracticable to consult with each other as
    contemplated by this clause (iii), to consult with each
    other before issuing any press release or, to the extent
    practical, otherwise making any public statement with respect to
    this Agreement or the transactions contemplated hereby. In
    addition to the foregoing, except to the extent disclosed in or
    consistent with the Joint Proxy Statement/Prospectus in
    accordance with the provisions of Section 5.1 or as
    otherwise permitted under Section 4.3, no party shall issue
    any press release or otherwise make any public statement or
    disclosure concerning the other party or the other partys
    business, financial condition or results of operations without
    the consent of such other party, which consent shall not be
    unreasonably withheld or delayed.
 
    5.13  Additional
    Agreements.  In case at any time after the
    Effective Time any further action is necessary or desirable to
    carry out the purposes of this Agreement or to vest the
    Surviving Corporation with full title to all properties, assets,
    rights, approvals, immunities and franchises of either of the
    Constituent Corporations, the proper officers and directors of
    each party to this Agreement shall take all such necessary
    action.
    
    A-35
 
 
    ARTICLE VI
    
 
    Conditions
    Precedent
    
 
    6.1  Conditions to Each Partys Obligation
    To Effect the Merger.  The respective
    obligation of each of the parties to effect the Merger shall be
    subject to the satisfaction prior to the Closing of the
    following conditions:
 
    (a) Stockholder Approval.  XM shall
    have obtained the Required XM Vote, and Sirius shall have
    obtained the Required Sirius Votes.
 
    (b) NASDAQ Listing.  The shares of
    (i) Sirius Common Stock to be issued in the Merger and
    (ii) Sirius Common Stock to be reserved for issuance upon
    exercise, vesting or payment under any Converted Equity Awards
    shall have been authorized for listing on NASDAQ, subject to
    official notice of issuance.
 
    (c) Requisite Regulatory
    Approvals.  The authorizations, consents,
    orders or approvals of, or declarations or filings with, and the
    expirations of waiting periods required from, any Governmental
    Entity set forth in Section 6.1(c) of each of the XM
    Disclosure Schedule and the Sirius Disclosure Schedule shall
    have been filed, have occurred or been obtained (all such
    permits, approvals, filings and consents and the lapse of all
    such waiting periods being referred to as the Requisite
    Regulatory Approvals), and all such Requisite
    Regulatory Approvals shall be in full force and effect.
 
    (d) Form S-4.  The
    Form S-4
    shall have become effective under the Securities Act and shall
    not be the subject of any stop order or proceedings seeking a
    stop order.
 
    (e) No Injunctions or Restraints;
    Illegality.  No temporary restraining order,
    preliminary or permanent injunction or other order issued by any
    court of competent jurisdiction or other legal restraint or
    prohibition (an Injunction) preventing the
    consummation of the Merger shall be in effect. There shall not
    be any action taken, or any law, rule, regulation or order
    enacted, entered, enforced or deemed applicable to the Merger,
    by any Governmental Entity of competent jurisdiction that makes
    the consummation of the Merger illegal.
 
    (f) Burdensome Condition.  There
    shall not be (i) any action taken, or any statute, rule,
    regulation, order or decree enacted, entered, enforced or deemed
    applicable to the Merger or the transactions contemplated by
    this Agreement by any Governmental Entity of competent
    jurisdiction, or (ii) any circumstance arising, or
    transaction, agreement, arrangement or instrument entered into,
    or which would be necessary to be entered into, in connection
    with the Merger or the transactions contemplated by this
    Agreement, which, in either case, imposes any term, condition,
    obligation or restriction upon Sirius, the Surviving Corporation
    or their respective Subsidiaries which, individually or the
    aggregate, would reasonably be expected to have a material
    adverse effect on the present or prospective consolidated
    financial condition, business or operating results of Sirius
    after the Effective Time.
 
    6.2  Conditions to Obligations of
    Sirius.  The obligation of Sirius and
    Merger Co. to effect the Merger is subject to the satisfaction
    prior to the Closing of the following conditions unless waived
    by Sirius:
 
    (a) Representations and Warranties.
 
    (i) The representation and warranties of XM set forth in
    Section 3.1(b) shall be true and correct in all material
    respects as of the date hereof and as of the Closing Date as
    though made on and as of the Closing Date (except for such
    representations and warranties made only as of a specified date,
    which shall be true and correct in all material respects as of
    the specified date).
 
    (ii) Each of the other representations and warranties of XM
    set forth in this Agreement (read without any materiality or
    material adverse effect qualifications, other than the
    representation set forth in Section 3.1(k)(ii) which shall
    be read with the material adverse effect qualification) shall be
    true and correct as of the date of this Agreement and as of the
    Closing Date as though made on and as of the Closing Date
    (except for such representations and warranties made only as of
    a specified date, which shall be true and correct in all
    material respects as of the specified date), other than such
    failures to be true and correct that, individually or in the
    aggregate, have not had and would not reasonably be expected to
    have a material adverse effect on XM, and Sirius shall have
    received a certificate signed on behalf of XM by an authorized
    executive officer of XM to such effect.
    
    A-36
 
 
    (b) Performance of Obligations of
    XM.  XM shall have performed in all material
    respects all obligations, and complied in all material respects
    with the agreements and covenants, required to be performed by
    or complied with by it under this Agreement at or prior to the
    Closing Date, and Sirius shall have received a certificate
    signed on behalf of XM by an authorized executive officer of XM
    to such effect.
 
    (c) Tax Opinion.  Sirius shall have
    received the opinion of Simpson Thacher & Bartlett
    LLP, counsel to Sirius, dated the Closing Date, to the effect
    that the Merger will be treated for Federal income tax purposes
    as a reorganization within the meaning of Section 368(a) of
    the Code. In rendering such opinion, counsel to Sirius shall be
    entitled to rely upon customary representations and assumptions
    provided by Sirius, Merger Co. and XM that counsel to Sirius
    reasonably deems relevant.
 
    6.3 Conditions to Obligations of
    XM.  The obligation of XM to effect the
    Merger is subject to the satisfaction prior to the Closing of
    the following conditions unless waived by XM:
 
    (a) Representations and Warranties.
 
    (i) The representation and warranties of Sirius set forth
    in Section 3.2(b) shall be true and correct in all material
    respects as of the date hereof and as of the Closing Date as
    though made on and as of the Closing Date (except for such
    representations and warranties made only as of a specified date,
    which shall be true and correct in all material respects as of
    the specified date).
 
    (ii) Each of the other representations and warranties of
    Sirius set forth in this Agreement (read without any materiality
    or material adverse effect qualifications, other than the
    representation set forth in Section 3.2(k)(ii) which shall
    be read with the material adverse effect qualification) shall be
    true and correct as of the date of this Agreement and as of the
    Closing Date as though made on and as of the Closing Date
    (except for such representations and warranties made only as of
    a specified date, which shall be true and correct in all
    material respects as of the specified date), other than such
    failures to be true and correct that, individually or in the
    aggregate, have not had and would not reasonably be expected to
    have a material adverse effect on Sirius, and XM shall have
    received a certificate signed on behalf of XM by an authorized
    executive officer of Sirius to such effect.
 
    (b) Performance of Obligations of
    Sirius.  Sirius shall have performed in all
    material respects all obligations, and complied in all material
    respects with the agreements and covenants, required to be
    performed or complied with by it under this Agreement at or
    prior to the Closing Date, and XM shall have received a
    certificate signed on behalf of Sirius by an authorized
    executive officer of Sirius to such effect.
 
    (c) Tax Opinion.  XM shall have
    received the opinion of Skadden, Arps, Slate,
    Meagher & Flom LLP, counsel to XM, dated the Closing
    Date, to the effect that the Merger will be treated for Federal
    income tax purposes as a reorganization within the meaning of
    Section 368(a) of the Code. In rendering such opinion,
    counsel to XM shall be entitled to rely upon customary
    representations and assumptions provided by Sirius, Merger Co.
    and XM that counsel to XM reasonably deems relevant.
 
    ARTICLE VII
    
 
    Termination
    and Amendment
    
 
    7.1  Termination.  This
    Agreement may be terminated at any time prior to the Effective
    Time, by action taken or authorized by the Board of Directors of
    the terminating party or parties, whether before or after any
    Required Stockholder Vote has been obtained:
 
    (a) by mutual consent of Sirius, Merger Co. and XM in a
    written instrument;
 
    (b) by either Sirius or XM, upon written notice to the
    other party, if a Governmental Entity of competent jurisdiction
    that must grant a Requisite Regulatory Approval has denied
    approval of the Merger and such denial has become final and
    non-appealable; or any Governmental Entity of competent
    jurisdiction shall have issued an order, decree or ruling or
    taken any other action permanently restraining, enjoining or
    otherwise prohibiting the Merger, and such order, decree, ruling
    or other action has become final and non-appealable;
    provided, however, that the right to terminate
    this Agreement under this Section 7.1(b) shall not be
    available to
    
    A-37
 
    any party whose failure to comply with Section 5.3 or any
    other provision of this Agreement has been the cause of, or
    resulted in, such action;
 
    (c) by either Sirius or XM, upon written notice to the
    other party, if the Merger shall not have been consummated on or
    before March 1, 2008; provided, however, that
    the right to terminate this Agreement under this
    Section 7.1(c) shall not be available to any party whose
    failure to comply with any provision of this Agreement has been
    the cause of, or resulted in, the failure of the Effective Time
    to occur on or before such date;
 
    (d) by Sirius, upon written notice to XM, if:
 
    (i)(A) an Occurrence with respect to XM has occurred,
    (B) XM has delivered a Notice of Recommendation Change to
    Sirius pursuant to Section 5.4(b)(ii)(II), (C) XM
    shall have not withdrawn such Notice of Recommendation Change,
    and (D) Sirius has elected (by written notice to XM made by
    the close of business on the Sirius Election Date) to terminate
    this Agreement pursuant to this Section 7.1(d);
 
    (ii) Sirius is entitled but fails to terminate this
    Agreement pursuant to Section 7.1(d)(i) by the close of
    business on the Sirius Election Date and thereafter (A) XM
    shall have materially breached its obligations under this
    Agreement by reason of a failure to call the XM Stockholders
    Meeting in accordance with Section 5.1(b) or (B) XM
    shall have failed to prepare and mail to its stockholders the
    Joint Proxy Statement/Prospectus in accordance with
    Section 5.1(a); or
 
    (iii)(A) XM shall have effected a Change in XM
    Recommendation other than in accordance with the terms of this
    Agreement or (B) XM shall have materially breached its
    obligations under Section 5.4(a)(iii);
 
    (e) by XM, upon written notice to Sirius, if:
 
    (i) (A) an Occurrence with respect to Sirius has
    occurred, (B) Sirius has delivered a Notice of
    Recommendation Change to XM pursuant to
    Section 5.4(b)(ii)(II), (C) Sirius shall have not
    withdrawn such Notice of Recommendation Change, and (D) XM
    has elected (by written notice to Sirius made by the close of
    business on the XM Election Date) to terminate this Agreement
    pursuant to this Section 7.1(e);
 
    (ii) XM is entitled but fails to terminate this Agreement
    pursuant to Section 7.1(e)(i) by the close of business on
    the Sirius Election Date and thereafter (A) Sirius shall
    have materially breached its obligations under this Agreement by
    reason of a failure to call the Sirius Stockholders Meeting in
    accordance with Section 5.1(c) or (B) Sirius shall
    have failed to prepare and mail to its stockholders the Joint
    Proxy Statement/Prospectus in accordance with
    Section 5.1(a); or
 
    (iii) (A) Sirius shall have effected a Change in
    Sirius Recommendation other than in accordance with the terms of
    this Agreement or (B) Sirius shall have materially breached
    its obligations under Section 5.4(a)(iii);
 
    (f) by either Sirius or XM, upon written notice to the
    other party, if there shall have been a breach by the other
    party of any of the covenants or agreements or any of the
    representations or warranties set forth in this Agreement on the
    part of such other party, which breach, either individually or
    in the aggregate, would result in, if occurring or continuing on
    the Closing Date, the failure of the condition set forth in
    Section 6.2(a) or (b) or Section 6.3(a) or (b),
    as the case may be, and which breach has not been cured within
    45 days following written notice thereof to the breaching
    party or, by its nature, cannot be cured within such time
    period; or
 
    (g) by either Sirius or XM, if the Required Sirius Votes or
    Required XM Vote shall not have been obtained upon a vote taken
    thereon at the duly convened Sirius Stockholders Meeting or XM
    Stockholders Meeting, as the case may be, or any adjournment or
    postponement thereof at which the applicable vote was taken.
 
    7.2  Effect of
    Termination.  (a) In the event of
    termination of this Agreement by either XM or Sirius as provided
    in Section 7.1, this Agreement shall forthwith become void,
    and there shall be no liability or obligation on the part of
    Sirius or XM or their respective officers or directors, except
    with respect to Section 5.2(b) (Access to Information;
    Confidentiality), Section 5.9 (Fees and Expenses), this
    Section 7.2 (Effect of Termination), and
    
    A-38
 
    Article VIII (General Provisions), which shall survive such
    termination and except that no party shall be relieved or
    released from any liabilities or damages arising out of its
    willful and material breach of this Agreement.
 
    (b) Sirius shall pay XM, by wire transfer of immediately
    available funds to such accounts as XM may designate, the sum of
    $175 million (the Sirius Termination
    Fee) if this Agreement is terminated as follows:
 
    (i) if XM shall terminate this Agreement pursuant to
    Section 7.1(e), then Sirius shall pay the Sirius
    Termination Fee within three business days following such
    termination;
 
    (ii) if (A) either party shall terminate this
    Agreement pursuant to Section 7.1(g) because the Required
    Sirius Votes shall not have been received and (B) at any
    time after the date of this Agreement and at or before the date
    of the Sirius Stockholders Meeting an Acquisition Proposal shall
    have been publicly announced or otherwise communicated to the
    senior management or Board of Directors of Sirius (a
    Public Proposal) with respect to Sirius, then
    Sirius shall pay one-third of the Sirius Termination Fee within
    three business days following such termination; and if
    (C) within 12 months of the date of such termination
    of this Agreement, Sirius or any of its Subsidiaries executes
    any definitive agreement with respect to, or consummates, any
    Acquisition Proposal, then Sirius shall pay the remaining
    two-thirds of the Sirius Termination Fee upon the date of such
    execution or consummation; or
 
    (iii) if (A) either party shall terminate this
    Agreement pursuant to Section 7.1(c) or XM shall terminate
    this Agreement pursuant to Section 7.1(f), (B) at any
    time after the date of this Agreement and before such
    termination there shall have been a Public Proposal with respect
    to Sirius, and (C) following the occurrence of such Public
    Proposal, Sirius shall have breached intentionally or recklessly
    (and not cured after notice thereof) any of its representations,
    warranties, covenants or agreements set forth in this Agreement,
    which breach shall have materially contributed to the failure of
    the Effective Time to occur prior to the termination of this
    Agreement, then Sirius shall pay one-third of the Sirius
    Termination Fee within three business days following such
    termination; and if (D) within 12 months of the date
    of such termination of this Agreement, Sirius or any of its
    Subsidiaries executes any definitive agreement with respect to,
    or consummates, any Acquisition Proposal, then Sirius shall pay
    the remaining two-thirds of the Sirius Termination Fee upon the
    date of such execution or consummation.
 
    For purposes of clauses (ii) and (iii) of this
    Section 7.2(b), the term Acquisition Proposal
    shall have the meaning assigned to such term in
    Section 5.4(a) except that the reference to 15% or
    more in the definition of Acquisition Proposal
    shall be deemed to be a reference to a majority. If
    Sirius fails to pay all amounts due to XM on the dates
    specified, then Sirius shall pay all costs and expenses
    (including legal fees and expenses) incurred by XM in connection
    with any action or proceeding (including the filing of any
    lawsuit) taken by it to collect such unpaid amounts, together
    with interest on such unpaid amounts at the prime lending rate
    prevailing at such time, as published in the Wall Street
    Journal, from the date such amounts were required to be paid
    until the date actually received by XM.
 
    (c) XM shall pay Sirius, by wire transfer of immediately
    available funds, the sum of $175 million (the XM
    Termination Fee) if this Agreement is terminated as
    follows:
 
    (i) if Sirius shall terminate this Agreement pursuant to
    Section 7.1(d), then XM shall pay the XM Termination Fee
    within three business days following such termination;
 
    (ii) if (A) either party shall terminate this
    Agreement pursuant to Section 7.1(g) because the Required
    XM Vote shall not have been received and (B) at any time
    after the date of this Agreement and at or before the date of
    the XM Stockholders Meeting there shall have been a Public
    Proposal with respect to XM, then XM shall pay one-third of the
    XM Termination Fee within three business days following such
    termination; and if (C) within 12 months of the date
    of such termination of this Agreement, XM or any of its
    Subsidiaries enters into any definitive agreement with respect
    to, or consummates, any Acquisition Proposal, then XM shall pay
    the remaining two-thirds of the XM Termination Fee on the date
    of such execution or consummation; or
 
    (iii) if (A) either party shall terminate this
    Agreement pursuant to Section 7.1(c) or Sirius shall
    terminate this Agreement pursuant to Section 7.1(f),
    (B) at any time after the date of this Agreement and before
    such termination there shall have been a Public Proposal with
    respect to XM, and (C) following the occurrence of
    
    A-39
 
    such Public Proposal, XM shall have breached intentionally or
    recklessly (and not cured after notice thereof) any of its
    representations, warranties, covenants or agreements set forth
    in this Agreement, which breach shall have materially
    contributed to the failure of the Effective Time to occur prior
    to the termination of this Agreement, then XM shall pay
    one-third of the XM Termination Fee within three business days
    following such termination; and, if (D) within
    12 months of the date of such termination of this
    Agreement, XM or any of its Subsidiaries executes any definitive
    agreement with respect to, or consummates, any Acquisition
    Proposal, then XM shall pay the remaining two-thirds of the XM
    Termination Fee upon the date of such execution or consummation.
 
    For purposes of clauses (ii) and (iii) of this
    Section 7.2(c), the term Acquisition Proposal
    shall have the meaning assigned to such term in
    Section 5.4(a) except that the reference to 15% or
    more in the definition of Acquisition Proposal
    shall be deemed to be a reference to a majority. If
    XM fails to pay all amounts due to Sirius on the dates
    specified, then XM shall pay all costs and expenses (including
    legal fees and expenses) incurred by Sirius in connection with
    any action or proceeding (including the filing of any lawsuit)
    taken by it to collect such unpaid amounts, together with
    interest on such unpaid amounts at the prime lending rate
    prevailing at such time, as published in the Wall Street
    Journal, from the date such amounts were required to be paid
    until the date actually received by Sirius.
 
    7.3  Amendment.  This
    Agreement may be amended by the parties, by action taken or
    authorized by their respective Boards of Directors, at any time
    before or after approval of the matters presented in connection
    with this Agreement by the stockholders of XM or of Sirius, but,
    after any such approval, no amendment shall be made which by law
    requires further approval by such stockholders without such
    further approval. This Agreement may not be amended except by an
    instrument in writing signed on behalf of each of the parties
    hereto.
 
    7.4  Extension;
    Waiver.  At any time prior to the
    Effective Time, the parties, by action taken or authorized by
    their respective Board of Directors, may, to the extent
    permitted by applicable law, (i) extend the time for the
    performance of any of the obligations or other acts of the other
    party, (ii) waive any inaccuracies in the representations
    and warranties contained herein or in any document delivered
    pursuant hereto, and (iii) waive compliance with any of the
    agreements or conditions contained herein. Any agreement on the
    part of a party hereto to any such extension or waiver shall be
    valid only if set forth in a written instrument signed on behalf
    of such party. The failure of a party to assert any of its
    rights under this Agreement or otherwise shall not constitute a
    waiver of those rights. No single or partial exercise of any
    right, remedy, power or privilege hereunder shall preclude any
    other or further exercise thereof or the exercise of any other
    right, remedy, power or privilege. Any waiver shall be effective
    only in the specific instance and for the specific purpose for
    which given and shall not constitute a waiver to any subsequent
    or other exercise of any right, remedy, power or privilege
    hereunder.
 
    7.5  Alternative
    Structure.  The parties hereby agree to
    cooperate in the consideration of alternative structures to
    implement the transactions contemplated by this Agreement as
    long as there is no change in the economic terms thereof and
    such alternative structure does not impose any material delay
    on, or condition to, the consummation of the Merger, or
    adversely affect any of the parties hereto or either XMs
    or Siriuss stockholders or result in additional liability
    to XMs or Siriuss directors or officers.
 
    ARTICLE VIII
    
 
    General
    Provisions
    
 
    8.1  Non-survival of Representations, Warranties
    and Agreements.  None of the
    representations, warranties, covenants and agreements in this
    Agreement or in any instrument delivered pursuant to this
    Agreement, including any rights arising out of any breach of
    such representations, warranties, covenants, and agreements,
    shall survive the Effective Time, except for those covenants and
    agreements that by their terms apply or are to be performed in
    whole or in part after the Effective Time.
 
    8.2  Notices.  All notices
    and other communications hereunder shall be in writing and shall
    be deemed duly given (a) on the date of delivery if
    delivered personally, or by facsimile, upon confirmation of
    receipt, (b) on the first business day following the date
    of dispatch if delivered by a recognized next day courier
    service, or (c) on the fifth business day following the
    date of mailing if delivered by registered or certified mail,
    return receipt requested,
    
    A-40
 
    postage prepaid. All notices hereunder shall be delivered as set
    forth below, or pursuant to such other instructions as may be
    designated in writing by the party to receive such notice.
 
    (a) if to Sirius or Merger Co., to
 
    |  | 
| 
           Sirius
    Satellite Radio Inc.
    
 | 
| 
           1221
    Avenue of the Americas
    
 | 
| 
           New
    York, New York 10020
    
 | 
| 
           Attention:
    Patrick Donnelly
    
 | 
| 
           Facsimile
    No.:
    (212) 584-5353
    
 | 
 
    with a copy to
 
    |  |  |  | 
| 
           Simpson
    Thacher & Bartlett LLP
    
 | 
| 
           425
    Lexington Avenue
    
 | 
| 
           New
    York, New York 10017
    
 | 
| 
           Attention:
    
 |  | Gary L. Sellers, Esq. | 
|  |  | Kathryn King Sudol, Esq. | 
| 
           Facsimile
    No.:
    (212) 455-2502
    
 | 
 
    and
 
    (b) if to XM, to
 
    |  |  |  | 
| 
           XM
    Satellite Radio Holdings Inc.
    
 | 
| 
           150
    Eckington Place, N.E.
    
 | 
| 
           Washington,
    DC 20002
    
 | 
| 
           Attention:
    
 |  | Joseph M. Titlebaum | 
| 
           Facsimile
    No.:
    (202) 380-4534
    
 | 
 
    with a copy to
 
    |  |  |  | 
| 
           Skadden,
    Arps, Slate, Meagher & Flom LLP
    
 | 
| 
           Four
    Times Square
    
 | 
| 
           New
    York, New York 10036
    
 | 
| 
           Attention:
    
 |  | Morris J. Kramer, Esq. | 
|  |  | Thomas H. Kennedy, Esq. | 
| 
           Facsimile
    No.:
    (212) 735-2000
    
 | 
 
    8.3  Interpretation.  When
    a reference is made in this Agreement to Sections, Exhibits or
    Schedules, such reference shall be to a Section of or Exhibit or
    Schedule to this Agreement unless otherwise indicated. The table
    of contents and headings contained in this Agreement are for
    reference purposes only and shall not affect in any way the
    meaning or interpretation of this Agreement. Whenever the words
    include, includes or
    including are used in this Agreement, they shall be
    deemed to be followed by the words without
    limitation. The phrase made available in this
    Agreement shall mean that the information referred to has been
    made available by the party to whom such information is to be
    made available. The phrases herein,
    hereof, hereunder and words of similar
    import shall be deemed to refer to this Agreement as a whole,
    including the Exhibits and Schedules hereto, and not to any
    particular provision of this Agreement. The word or
    shall be inclusive and not exclusive. Any pronoun shall include
    the corresponding masculine, feminine and neuter forms. The
    phrases known or knowledge mean, with
    respect to either party to this Agreement, the actual knowledge
    of such partys executive officers. The term
    affiliate has the meaning given to it in
    Rule 12b-2
    of the Exchange Act, and the term person has the
    meaning given to it in Sections 3(a)(9) and 13(d)(3) of the
    Exchange Act.
 
    8.4  Counterparts.  This
    Agreement may be executed in counterparts, each of which shall
    be considered one and the same agreement and this Agreement
    shall become effective when such counterparts have been signed
    by each of the parties and delivered to the other parties, it
    being understood that the parties need not sign the same
    counterpart.
    
    A-41
 
 
    8.5  Entire Agreement; No Third Party
    Beneficiaries.  This Agreement (including
    the documents and the instruments referred to herein)
    (a) constitutes the entire agreement and supersedes all
    prior agreements and understandings, both written and oral,
    between the parties with respect to the subject matter hereof,
    other than the Confidentiality Agreement, which shall survive
    the execution and delivery of this Agreement and (b) except
    as provided in Section 5.11 (which is intended for the
    benefit of only the persons specified therein), is not intended
    to confer upon any person other than the parties hereto any
    rights or remedies hereunder.
 
    8.6  Governing Law.  This
    Agreement shall be governed by, and construed in accordance
    with, the laws of the State of Delaware (without giving effect
    to choice of law principles thereof).
 
    8.7  Severability.  Any
    term or provision of this Agreement which is invalid or
    unenforceable in any jurisdiction shall, as to that
    jurisdiction, be ineffective to the extent of such invalidity or
    unenforceability and, unless the effect of such invalidity or
    unenforceability would prevent the parties from realizing the
    major portion of the economic benefits of the Merger that they
    currently anticipate obtaining therefrom, shall not render
    invalid or unenforceable the remaining terms and provisions of
    this Agreement or affect the validity or enforceability of any
    of the terms or provisions of this Agreement in any other
    jurisdiction. If any provision of this Agreement is so broad as
    to be unenforceable, the provision shall be interpreted to be
    only so broad as is enforceable.
 
    8.8  Assignment.  Neither
    this Agreement nor any of the rights, interests or obligations
    of the parties hereunder shall be assigned by either of the
    parties hereto (whether by operation of law or otherwise)
    without the prior written consent of the other party, and any
    attempt to make any such assignment without such consent shall
    be null and void. Subject to the preceding sentence, this
    Agreement will be binding upon, inure to the benefit of and be
    enforceable by the parties and their respective successors and
    permitted assigns.
 
    8.9  Submission to
    Jurisdiction.  Each party hereto
    irrevocably submits to the jurisdiction of (i) the Supreme
    Court of the State of New York, New York County, and
    (ii) the United States District Court for the Southern
    District of New York, for the purposes of any suit, action or
    other proceeding arising out of this Agreement or any
    transaction contemplated hereby. Each party hereto agrees to
    commence any action, suit or proceeding relating hereto either
    in the United States District Court for the Southern District of
    New York or, if such suit, action or other proceeding may not be
    brought in such court for reasons of subject matter
    jurisdiction, in the Supreme Court of the State of New York, New
    York County. Each party hereto irrevocably and unconditionally
    waives any objection to the laying of venue of any action, suit
    or proceeding arising out of this Agreement or the transactions
    contemplated hereby in (A) the Supreme Court of the State
    of New York, New York County, or (B) the United States
    District Court for the Southern District of New York, and hereby
    further irrevocably and unconditionally waives and agrees not to
    plead or claim in any such court that any such action, suit or
    proceeding brought in any such court has been brought in an
    inconvenient forum. Each party hereto further irrevocably
    consents to the service of process out of any of the
    aforementioned courts in any such suit, action or other
    proceeding by the mailing of copies thereof by mail to such
    party at its address set forth in this Agreement, such service
    of process to be effective upon acknowledgment of receipt of
    such registered mail; provided that nothing in this
    Section 8.9 shall affect the right of any party to serve
    legal process in any other manner permitted by law. The consent
    to jurisdiction set forth in this Section 8.9 shall not
    constitute a general consent to service of process in the State
    of New York and shall have no effect for any purpose except as
    provided in this Section. The parties hereto agree that a final
    judgment in any such suit, action or proceeding shall be
    conclusive and may be enforced in other jurisdictions by suit on
    the judgment or in any other manner provided by law.
 
    8.10  Enforcement.  The
    parties agree that irreparable damage would occur in the event
    that any of the provisions of this Agreement were not performed
    in accordance with their specific terms on a timely basis or
    were otherwise breached. It is accordingly agreed that the
    parties shall be entitled to an injunction or other equitable
    relief to prevent breaches of this Agreement and to enforce
    specifically the terms and provisions of this Agreement in any
    court identified in the Section above, this being in addition to
    any other remedy to which they are entitled at law or in equity.
 
    8.11  WAIVER OF JURY
    TRIAL.  EACH OF THE PARTIES HEREBY WAIVES
    TRIAL BY JURY IN ANY JUDICIAL PROCEEDING INVOLVING, DIRECTLY, IN
    ANY MATTERS (WHETHER SOUNDING IN TORT, CONTRACT OR OTHERWISE) IN
    ANY WAY ARISING OUT OF, RELATED TO, OR CONNECTED WITH, THIS
    AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.
    
    A-42
 
    IN WITNESS WHEREOF, Sirius Satellite Radio Inc., Vernon Merger
    Corporation and XM Satellite Radio Holdings Inc. have caused
    this Agreement to be signed by their respective officers
    thereunto duly authorized, all as of the date first set forth
    above.
 
    |  |  |  |  |  |  |  | 
| 
                        
    
 |  | SIRIUS SATELLITE RADIO INC. | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  | 
|  |  | By: |  | /s/  Mel
    Karmazin | 
|  |  |  |  |  | 
|  |  |  |  | Name: |  | Mel Karmazin | 
|  |  |  |  | Title: |  | Chief Executive Officer | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  | 
| 
                        
    
 |  | VERNON MERGER CORPORATION | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  | 
|  |  | By: |  | /s/  Mel
    Karmazin | 
|  |  |  |  |  | 
|  |  |  |  | Name: |  | Mel Karmazin | 
|  |  |  |  | Title: |  | Chief Executive Officer | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  | 
|  |  | XM SATELLITE RADIO HOLDINGS INC. | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  | 
|  |  | By: |  | /s/  Gary
    M. Parsons | 
|  |  |  |  |  | 
|  |  |  |  | Name: |  | Gary M. Parsons | 
|  |  |  |  | Title: |  | Chairman | 
    
    A-43
 
    Annex B
 
    Board of Directors
    Sirius Satellite Radio Inc.
    1221 Avenue of the Americas
    New York, NY
    10020-1001
 
    February 18,
    2007
    
 
    Members of the Board:
 
    We understand that XM Satellite Radio Holdings, Inc.
    (XM), Sirius Satellite Radio, Inc.
    (Sirius) and Vernon Merger Corporation, a wholly
    owned subsidiary of Sirius (Merger Co.), proposed to
    enter into an Agreement and Plan of Merger, substantially in the
    form of the draft dated February 18, 2007 (the
    Agreement), which provides, among other things, for
    the merger (the Merger) of Merger Co. with and into
    XM. Pursuant to the Merger, XM will become a wholly owned
    subsidiary of Sirius, and each outstanding share of Class A
    common stock of XM, par value $0.01 per share (the XM
    Common Stock), other than shares held in treasury or held
    by Sirius or any direct or indirect wholly owned subsidiary of
    Sirius or XM, will be converted into the right to receive
    4.60 shares (the Exchange Ratio) of common
    stock, par value $0.001 per share, of Sirius (the Sirius
    Common Stock). The terms and conditions of the Merger are
    more fully set forth in the Merger Agreement.
 
    You have asked for our opinion as to whether the Exchange Ratio
    pursuant to the Merger Agreement is fair from a financial point
    of view to Sirius.
 
    For purposes of the opinion set forth herein, we have:
 
    (a) reviewed certain publicly available financial
    statements and other business and financial information of XM
    and Sirius, respectively;
 
    (b) reviewed certain internal financial statements and
    other financial and operating data concerning XM and Sirius,
    respectively;
 
    (c) reviewed certain financial projections prepared by the
    managements of XM and Sirius, respectively;
 
    (d) reviewed information relating to certain strategic,
    financial and operational benefits anticipated from the Merger,
    prepared by the managements of XM and Sirius, respectively;
 
    (e) discussed the past and current operations and financial
    condition and the prospects of XM, including information
    relating to certain strategic, financial and operational
    benefits anticipated from the Merger, with senior executives of
    XM;
 
    (f) discussed the past and current operations and financial
    condition and the prospects of Sirius, including information
    relating to certain strategic, financial and operational
    benefits anticipated from the Merger, with senior executives of
    Sirius;
 
    (g) reviewed the pro forma impact of the Merger on Sirius;
 
    (h) reviewed the reported prices and trading activity for
    the XM Common Stock and the Sirius Common Stock;
 
    (i) reviewed the financial terms, to the extent publicly
    available, of certain comparable merger of equals transactions;
 
    (j) participated in discussions and negotiations among
    representatives of XM and Sirius and their financial and legal
    advisors;
 
    (k) reviewed the Merger Agreement and certain related
    documents; and
 
    (l) performed such other analyses and considered such other
    factors as we have deemed appropriate.
 
    We have assumed and relied upon, without independent
    verification, the accuracy and completeness of the information
    supplied or otherwise made available to us by XM and Sirius for
    the purposes of this opinion. With
    
    B-1
 
    respect to the financial projections, including information
    relating to certain strategic, financial and operational
    benefits anticipated from the Merger, we have assumed that they
    have been reasonably prepared on bases reflecting the best
    currently available estimates and judgments of the future
    financial performance of XM and Sirius. In addition, we have
    assumed, in all respects material to our analysis, that the
    Merger will be consummated in accordance with the terms set
    forth in the Merger Agreement without any waiver, amendment or
    delay of any terms or conditions, including, among other things,
    that the Merger will be treated as a tax-free reorganization
    pursuant to the Internal Revenue Code of 1986, as amended.
    Morgan Stanley has assumed that in connection with the receipt
    of all the necessary governmental, regulatory or other approvals
    and consents required for the proposed Merger, no delays,
    limitations, conditions or restrictions will be imposed that
    would have a material adverse effect on the contemplated
    benefits expected to be derived in the proposed Merger. We have
    relied upon, without independent verification, the assessment by
    the managements of XM and Sirius of: (i) the strategic,
    financial and other benefits expected to result from the Merger;
    (ii) the timing and risks associated with the integration
    of XM and Sirius; (iii) their ability to retain key
    employees of XM and Sirius, respectively and (iv) the
    validity of, and risks associated with, XM and Siriuss
    existing and future technologies, intellectual property,
    products, services and business models. We are not legal, tax or
    regulatory advisors and have relied upon, without independent
    verification, the assessment of Sirius and XM and their legal,
    tax and regulatory advisors with respect to such matters. We
    have not made any independent valuation or appraisal of the
    assets or liabilities of XM, nor have we been furnished with any
    such appraisals. Our opinion is necessarily based on financial,
    economic, market and other conditions as in effect on, and the
    information made available to us as of, the date hereof. Events
    occurring after the date hereof may affect this opinion and the
    assumptions used in preparing it, and we do not assume any
    obligation to update, revise or reaffirm this opinion.
 
    We have acted as financial advisor to the Board of Directors of
    Sirius in connection with this transaction and will receive a
    fee for our services which is contingent upon the closing of the
    Merger. In the past, we have provided financial advisory and
    financing services for Sirius and XM and have received fees in
    connection with such services. Morgan Stanley may also seek to
    provide such services to Sirius and XM in the future and will
    receive fees for the rendering of these services. In the
    ordinary course of our trading, brokerage, investment management
    and financing activities, Morgan Stanley or its affiliates may
    at any time hold long or short positions, and may trade or
    otherwise effect transactions, for our own account or the
    accounts of customers, in debt or equity securities or senior
    loans of Sirius, XM or any other company or any currency or
    commodity that may be involved in this transaction.
 
    It is understood that this letter is for the information of the
    Board of Directors of Sirius and may not be used for any other
    purpose without our prior written consent, except that a copy of
    this opinion may be included in its entirety in any filing
    Sirius is required to make with the Securities and Exchange
    Commission in connection with this transaction if such inclusion
    is required by applicable law. In addition, this opinion does
    not in any manner address the prices at which Siriuss
    Common Stock will trade following consummation of the Merger and
    Morgan Stanley expresses no opinion or recommendation as to how
    the shareholders of Sirius and XM should vote at the
    shareholders meetings to be held in connection with the
    Merger.
 
    Based on and subject to the foregoing, we are of the opinion on
    the date hereof that the Exchange Ratio pursuant to the Merger
    Agreement is fair from a financial point of view to Sirius.
 
    Very truly yours,
 
    MORGAN STANLEY & CO. INCORPORATED
 
    Richard S. Brail
    Managing Director
    
    B-2
 
    Annex C
 
 
    The Board of Directors
    XM Satellite Radio Holdings Inc.
    1500 Eckington Place, N.E.
    Washington, DC, 20002
 
    February 20,
    2007
    
 
    Members of the Board of Directors:
 
    You have requested our opinion as to the fairness, from a
    financial point of view, to the holders of Class A common
    stock, par value $0.01 per share (the Company Common
    Stock), of XM Satellite Radio Holdings Inc. (the
    Company) of the Exchange Ratio (as defined below) in
    the proposed merger (the Merger) of the Company with
    a wholly-owned subsidiary (the Merger Subsidiary) of
    Sirius Satellite Radio Inc. (the Merger Partner).
    Pursuant to the draft Agreement and Plan of Merger, dated as of
    February 18, 2007 (the Agreement), among the
    Company, the Merger Partner and the Merger Subsidiary, the
    Company will become a wholly-owned subsidiary of the Merger
    Partner, and each outstanding share of Company Common Stock,
    other than shares of Company Common Stock held in treasury or
    owned by wholly owned subsidiaries of the Company or the Merger
    Partner or its wholly owned subsidiaries, will be converted into
    the right to receive 4.60 shares (the Exchange
    Ratio) of the Merger Partners common stock, par
    value $0.001 per share (the Merger Partner Common
    Stock).
 
    In arriving at our opinion, we have (i) reviewed a draft
    dated February 18, 2007 of the Agreement;
    (ii) reviewed certain publicly available business and
    financial information concerning the Company and the Merger
    Partner and the industries in which they operate;
    (iii) reviewed the current and historical market prices of
    the Company Common Stock and the Merger Partner Common Stock;
    (iv) reviewed certain internal financial analyses and
    forecasts prepared by the managements of the Company and the
    Merger Partner relating to their respective businesses,
    financial forecasts prepared by the management of the Company
    relating to the Merger Partners business, as well as the
    estimated amount and timing of the cost savings and related
    expenses and other synergies expected to result from the Merger
    (the Synergies) and information provided by the
    managements of each of the Company and the Merger Partner
    relating to certain of their respective tax attributes; and
    (v) performed such other financial studies and analyses and
    considered such other information as we deemed appropriate for
    the purposes of this opinion.
 
    In addition, we have held discussions with certain members of
    the management of the Company and the Merger Partner with
    respect to certain aspects of the Merger, and the past and
    current business operations of the Company and the Merger
    Partner, the financial condition and future prospects and
    operations of the Company and the Merger Partner, the effects of
    the Merger on the financial condition and future prospects of
    the Company and the Merger Partner, and certain other matters we
    believed necessary or appropriate to our inquiry.
 
    In giving our opinion, we have relied upon and assumed, without
    assuming responsibility or liability for independent
    verification, the accuracy and completeness of all information
    that was publicly available or was furnished to or discussed
    with us by the Company and the Merger Partner or otherwise
    reviewed by or for us. We have not conducted or been provided
    with any valuation or appraisal of any assets or liabilities,
    nor have we evaluated the solvency of the Company or the Merger
    Partner under any state or federal laws relating to bankruptcy,
    insolvency or similar matters. In relying on financial analyses
    and forecasts provided to us by the managements of the Company
    and the Merger Partner, including the Synergies, we have assumed
    that they have been reasonably prepared based on assumptions
    reflecting the best currently available estimates and judgments
    by managements of the Company and the Merger Partner as to the
    expected future results of operations and financial condition of
    the Company and the Merger Partner to which such analyses or
    forecasts relate. We express no view as to such analyses or
    forecasts (including the Synergies) or the assumptions on which
    they were based. We have also assumed that the Merger will
    qualify as a tax-free reorganization for United States federal
    income tax purposes, have the tax consequences described in
    discussions with, and materials furnished to us by,
    representatives of the Company, that the other transactions
    contemplated by the Agreement will be consummated as described
    in the Agreement, and that
    
    C-1
 
    the definitive Agreement will not differ in any material
    respects from the draft thereof furnished to us. We have also
    assumed that the representations and warranties made by the
    Company and the Merger Partner in the Agreement and the related
    agreements are and will be true and correct in all ways material
    to our analysis. We are not legal, regulatory or tax experts and
    have relied on the assessments made by advisors to the Company
    with respect to such issues. We have further assumed that all
    material governmental, regulatory or other consents and
    approvals necessary for the consummation of the Merger will be
    obtained without any adverse effect on the Company or the Merger
    Partner or on the contemplated benefits of the Merger in any
    ways material to our analysis.
 
    Our opinion is necessarily based on economic, market and other
    conditions as in effect on, and the information made available
    to us as of, the date hereof. It should be understood that
    subsequent developments may affect this opinion and that we do
    not have any obligation to update, revise, or reaffirm this
    opinion. Our opinion is limited to the fairness, from a
    financial point of view, to the holders of the Company Common
    Stock of the Exchange Ratio in the proposed Merger and we
    express no opinion as to the fairness of the Merger to, or any
    consideration to be received by, the holders of any other class
    of securities, creditors or other constituencies of the Company
    or as to the underlying decision by the Company to engage in the
    Merger. We are expressing no opinion herein as to the price at
    which the Company Common Stock or the Merger Partner Common
    Stock will trade at any future time.
 
    We note that we were not authorized to and did not solicit any
    expressions of interest from any other parties with respect to
    the sale of all or any part of the Company or any other
    alternative transaction.
 
    We have acted as financial advisor to the Company with respect
    to the proposed Merger and will receive a fee from the Company
    for our services, a substantial portion of which will become
    payable only if the proposed Merger is consummated. In addition,
    the Company has agreed to indemnify us for certain liabilities
    arising out of our engagement. We and our affiliates have
    performed in the past, and may continue to perform, certain
    services for the Company, the Merger Partner and their
    respective affiliates, all for customary compensation, including
    (i) acting as joint bookrunner in connection with the
    Companys private offering of $600 million of
    unsecured 9.75% senior notes due 2014 and $200 million
    of unsecured senior floating rate notes due 2013 in May 2006,
    (ii) acting as lead bookrunner in connection with the
    Companys $250 million senior secured credit facility
    in April 2006, (iii) providing treasury and security
    services to the Company on an ongoing basis, (iv) acting as
    lead bookrunner in connection with the Merger Partners
    prospective offering of $250 million of senior notes in
    March 2005, which was not priced due to market conditions, and
    (v) acting as underwriter of a block trade for Apollo
    Investment Fund IV, L.P. and Apollo Overseas Partners IV,
    L.P., each an affiliate of the Merger Partner, in September
    2005. Our commercial bank affiliate is agent bank and lender to
    the Company under its $250 million senior secured revolving
    credit facility. In the ordinary course of our businesses, we
    and our affiliates may actively trade the debt and equity
    securities of the Company or the Merger Partner for our own
    account or for the accounts of customers and, accordingly, we
    may at any time hold long or short positions in such securities.
 
    On the basis of and subject to the foregoing, it is our opinion
    as of the date hereof that the Exchange Ratio in the proposed
    Merger is fair, from a financial point of view, to the holders
    of the Company Common Stock.
 
    This letter is provided to the Board of Directors of the Company
    in connection with and for the purposes of its evaluation of the
    Merger. This opinion does not constitute a recommendation to any
    shareholder of the Company as to how such shareholder should
    vote with respect to the Merger or any other matter. This
    opinion may not be disclosed, referred to, or communicated (in
    whole or in part) to any third party for any purpose whatsoever
    except with our prior written approval. This opinion may be
    reproduced in full in any proxy or information statement mailed
    to shareholders of the Company but may not otherwise be
    disclosed publicly in any manner without our prior written
    approval.
 
    Very truly yours,
 
    /s/  J.P. Morgan
    Securities Inc.
 
 
    J.P. MORGAN SECURITIES INC.
    
    C-2
 
    Annex D
 
    CERTIFICATE
    OF AMENDMENT
    OF
    AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
    OF
    SIRIUS SATELLITE RADIO INC.
 
    The undersigned officer of Sirius Satellite Radio Inc., a
    corporation organized and existing under and by virtue of the
    General Corporation Law of the State of Delaware (the
    Corporation), DOES HEREBY CERTIFY as follows:
 
    FIRST: The name of the Corporation is Sirius Satellite Radio Inc.
 
    SECOND: The Amended and Restated Certificate of Incorporation of
    the Corporation is hereby amended by changing Section (1)
    of the Article numbered Fourth so that, as amended,
    said Section of said Article shall be and read as follows:
 
    Fourth: (1) The total number of shares of all classes
    of stock which the Corporation shall have authority to issue
    is           shares,
    consisting of (1) 50,000,000 shares of preferred
    stock, par value $0.001 per share (Preferred Stock),
    and
    (2)            shares
    of common stock, par value $0.001 per share (Common
    Stock).
 
    THIRD: The foregoing amendment was duly adopted in accordance
    with the provisions of Section 242 of the General
    Corporation Law of the State of Delaware.
 
    IN WITNESS WHEREOF, the undersigned has signed this Certificate
    of Amendment as of this   day
    of     .
 
    Sirius Satellite Radio Inc.
 
    Name: 
    
    D-1
 
    PART II
    
 
    INFORMATION
    NOT REQUIRED IN PROSPECTUS
 
    Section 145 of the DGCL permits each Delaware business
    corporation to indemnify its directors, officers, employees and
    agents against liability for each such persons acts taken
    in his or her capacity as a director, officer, employee or agent
    of the corporation if such actions were taken in good faith and
    in a manner which he or she reasonably believed to be in or not
    opposed to the best interests of the corporation, and with
    respect to any criminal action, if he or she had no reasonable
    cause to believe his or her conduct was unlawful. SIRIUS
    Amended and Restated Certificate of Incorporation provides that
    we, to the full extent permitted by law, shall indemnify any of
    SIRIUS past and present directors, officers, employees or
    any person that is or was serving at SIRIUS request as a
    director, officer or employee of another enterprise if they were
    or are a party to, or are threatened to be made a party to, any
    threatened, pending or complete action, suit or proceeding. The
    indemnification provided therein includes expenses (including
    attorneys fees), judgments, fines and amounts paid in
    settlement and may be paid by us in advance of the final
    disposition of such action, suit or proceeding. In addition,
    SIRIUS Amended and Restated Certificate of Incorporation
    provides that SIRIUS may, to the full extent permitted by law,
    indemnify any other person for any such expenses as to actions
    in their official capacity or actions in another capacity while
    holding such office.
 
    As permitted by Section 102(b)(7) of the DGCL, SIRIUS
    Amended and Restated Certificate of Incorporation provides that
    no director shall be liable to us for monetary damages for
    breach of fiduciary duty as a director, except for liability:
 
    (i) for any breach of the directors duty of loyalty;
 
    (ii) for acts or omissions not in good faith or which
    involve intentional misconduct or a knowing violation of law;
 
    (iii) for the unlawful payment of dividends on or
    redemption of SIRIUS capital stock; or
 
    (iv) for any transaction from which the director derived an
    improper personal benefit.
 
    SIRIUS has obtained policies insuring SIRIUS and its directors
    and officers against certain liabilities, including liabilities
    under the Securities Act.
 
    |  |  | 
    | Item 21. | Exhibits
    and Financial Statement Schedules | 
 
    (a) Exhibits
 
    |  |  |  |  |  | 
| Exhibit 
 |  |  | 
| 
    Number
 |  | 
    Exhibit Description
 | 
|  | 
|  | 2 | .1 |  | Agreement and Plan of Merger,
    dated as of February 19, 2007, by and among Sirius
    Satellite Radio Inc., Vernon Merger Corporation and XM Satellite
    Radio Holdings Inc. (incorporated by reference to
    Exhibit 2.1 of Sirius Satellite Radio Inc.s Current
    Report on
    Form 8-K
    filed on February 21, 2007). | 
|  | 3 | .1 |  | Amended and Restated Certificate
    of Incorporation of Sirius Satellite Radio Inc., dated
    March 4, 2003 (incorporated by reference to
    Exhibit 3.1 to Sirius Satellite Radio Inc.s Annual
    Report on
    Form 10-K
    for the year ended December 31, 2002). | 
|  | 3 | .2 |  | Form of Amendment to Amended and
    Restated Certificate of Incorporation of Sirius Satellite Radio
    Inc. (included as Annex D to the joint proxy
    statement/prospectus forming part of this Registration Statement
    and incorporated herein by reference). | 
|  | 3 | .3 |  | Form of certificate for shares of
    Common Stock of Sirius Satellite Radio Inc. (incorporated by
    reference to Exhibit 4.3 to Sirius Satellite Radio
    Inc.s Registration Statement on
    Form S-1
    (File
    No. 33-74782)). | 
|  | 3 | .4 |  | Amended and Restated By-Laws of
    Sirius Satellite Radio Inc. (incorporated by reference to
    Exhibit 3.2 to Sirius Satellite Radio Inc.s Quarterly
    Report on
    Form 10-Q
    for the quarter ended September 30, 2001). | 
|  | 5 | .1* |  | Opinion of Simpson
    Thacher & Bartlett LLP regarding legality of
    securities being registered. | 
|  | 8 | .1* |  | Opinion of Simpson
    Thacher & Bartlett LLP regarding certain U.S. income
    tax aspects of the merger. | 
|  | 8 | .2* |  | Opinion of Skadden, Arps, Slate,
    Meagher & Flom LLP regarding certain U.S. income tax
    aspects of the merger. | 
    
    II-1
 
    |  |  |  |  |  | 
| Exhibit 
 |  |  | 
| 
    Number
 |  | 
    Exhibit Description
 | 
|  | 
|  | 23 | .1** |  | Consent of Ernst & Young
    LLP. | 
|  | 23 | .2** |  | Consent of KPMG LLP. | 
|  | 23 | .4* |  | Consent of Simpson
    Thacher & Bartlett LLP (included as part of
    Exhibit 5.1). | 
|  | 23 | .5* |  | Consent of Simpson
    Thacher & Bartlett LLP (included as part of
    Exhibit 8.1). | 
|  | 23 | .6* |  | Consent of Skadden, Arps, Slate,
    Meagher & Flom LLP (included as part of
    Exhibit 8.2). | 
|  | 24 | .1** |  | Powers of Attorney for Sirius
    Satellite Radio Inc. (included on signature page). | 
|  | 99 | .1* |  | Form of Proxy for Sirius Satellite
    Radio Inc. | 
|  | 99 | .2* |  | Form of Proxy for XM Satellite
    Radio Holdings Inc. | 
|  | 99 | .3 |  | Opinion of Morgan
    Stanley & Co. Incorporated (included as Annex B
    to the joint proxy statement/prospectus forming part of this
    Registration Statement and incorporated herein by reference). | 
|  | 99 | .4 |  | Opinion of J.P. Morgan
    Securities Inc. (included as Annex C to the joint proxy
    statement/prospectus forming part of this Registration Statement
    and incorporated herein by reference). | 
|  | 99 | .5 |  | Consent of Morgan
    Stanley & Co. Incorporated (included as part of
    Exhibit 99.3). | 
|  | 99 | .6** |  | Consent of J.P. Morgan
    Securities Inc. | 
 
 
    |  |  |  | 
    | * |  | To be filed by amendment | 
|  | 
    | ** |  | Filed herewith | 
 
 
    (A) The undersigned registrant hereby undertakes:
 
    (1) To file, during any period in which offers or sales are
    being made, a post-effective amendment to this registration
    statement:
 
    (i) To include any prospectus required by
    Section 10(a)(3) of the Securities Act of 1933;
 
    (ii) To reflect in the prospectus any facts or events
    arising after the effective date of the registration statement
    (or the most recent post-effective amendment thereof) which,
    individually or in the aggregate, represent a fundamental change
    in the information set forth in the registration statement.
    Notwithstanding the foregoing, any increase or decrease in
    volume of securities offered (if the total dollar value of
    securities offered would not exceed that which was registered)
    and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of
    prospectus filed with the Commission pursuant to Rule 424(b) if,
    in the aggregate, the changes in volume and price represent no
    more than 20% change in the maximum aggregate offering price set
    forth in the Calculation of Registration Fee table
    in the effective registration statement;
 
    (iii) To include any material information with respect to
    the plan of distribution not previously disclosed in the
    registration statement or any material change to such
    information in the registration statement.
 
    (2) That, for the purpose of determining any liability
    under the Securities Act of 1933, each such post-effective
    amendment shall be deemed to be a new registration statement
    relating to the securities offered therein, and the offering of
    such securities at that time shall be deemed to be the initial,
    bona fide offering thereof.
 
    (3) To remove from registration by means of a
    post-effective amendment any of the securities being registered
    which remain unsold at the termination of the offering.
 
    (B) The undersigned registrant hereby undertakes that, for
    purposes of determining any liability under the Securities Act
    of 1933, each filing of the registrants annual report
    pursuant to Sections 13(a) or 15(d) of the Securities
    Exchange Act of 1934 (and, where applicable, each filing of an
    employee benefit plans annual report pursuant to
    Section 15(d) of the Securities Exchange Act of
    1934) that is incorporated by reference in the
    II-2
 
    registration statement shall be deemed to be a new registration
    statement relating to the securities offered therein, and the
    offering of such securities at that time shall be deemed to be
    the initial bona fide offering thereof.
 
    (C) (1) The undersigned registrant hereby undertakes
    as follows: that before any public reoffering of the securities
    registered hereunder through use of a prospectus which is a part
    of this registration statement, by any person or party who is
    deemed to be an underwriter within the meaning of
    Rule 145(c), the issuer undertakes that such reoffering
    prospectus will contain the information called for by the
    applicable registration form with respect to reofferings by
    persons who may be deemed underwriters, in addition to the
    information called for by the other items of the applicable form.
 
    (2) The registrant undertakes that every prospectus:
    (i) that is filed pursuant to paragraph
    (1) immediately preceding, or (ii) that purports to
    meet the requirements of Section 10(a)(3) of the Act and is
    used in connection with an offering of securities subject to
    Rule 415, will be filed as part of an amendment to the
    registration statement and will not be used until such amendment
    is effective, and that, for purposes of determining any
    liability under the Securities Act of 1933, each such
    post-effective amendment shall be deemed to be a new
    registration statement relating to the securities offered
    therein, and the offering of such securities at that time shall
    be deemed to be the initial bona fide offering thereof.
 
    (D) Insofar as indemnification for liabilities arising
    under the Securities Act of 1933 may be permitted to
    directors, officers and controlling persons of the registrant
    pursuant to the foregoing provisions, or otherwise, the
    registrant has been advised that in the opinion of the SEC such
    indemnification is against public policy as expressed in the Act
    and is, therefore, unenforceable. In the event that a claim for
    indemnification against such liabilities (other than the payment
    by the registrant of expenses incurred or paid by a director,
    officer or controlling person of the registrant in the
    successful defense of any action, suit or proceeding) is
    asserted by such director, officer or controlling person in
    connection with the securities being registered, the registrant
    will, unless in the opinion of its counsel the matter has been
    settled by controlling precedent, submit to a court of
    appropriate jurisdiction the question whether such
    indemnification by it is against public policy as expressed in
    the Act and will be governed by the final adjudication of such
    issue.
 
    (E) The undersigned registrant hereby undertakes to respond
    to requests for information that is incorporated by reference in
    the prospectus pursuant to Item 4, 10(b), 11, or 13 of this
    form, within one business day of receipt of such request, and to
    send the incorporated documents by first class mail or other
    equally prompt means. This includes information contained in
    documents filed subsequent to the effective date of the
    registration statement through the date of responding to the
    request.
 
    (F) The undersigned registrant hereby undertakes to supply
    by means of a post-effective amendment all information
    concerning a transaction, and the company being acquired
    involved therein, that was not the subject of and included in
    the registration statement when it became effective.
    
    II-3
 
    SIGNATURES
 
    Pursuant to the requirements of the Securities Act, the
    registrant has duly caused this Registration Statement to be
    signed on its behalf by the undersigned, thereunto duly
    authorized, in the City of New York, State of New York, on the
    24th day of July, 2007.
 
    SIRIUS SATELLITE RADIO INC.
 
    |  |  |  | 
    |  | By: | /s/  Patrick
    L. Donnelly | 
    Patrick L. Donnelly
    Executive Vice President,
    General Counsel and Secretary
 
    POWER OF
    ATTORNEY
 
    Know all men by these presents, that the undersigned directors
    and officers of the Registrant, a Delaware corporation, which is
    filing a Registration Statement on
    Form S-4
    with the Securities and Exchange Commission,
    Washington, D.C. 20549 under the provisions of the
    Securities Act of 1933 hereby constitute and appoint Patrick L.
    Donnelly and Ruth Ziegler, and each of them, the
    individuals true and lawful attorney-in-fact and agents,
    with full power of substitution and resubstitution, for the
    person and in his or her name, place and stead, in any and all
    capacities, to sign such registration statement and any or all
    amendments, including post-effective amendments to the
    registration statement, including a prospectus or an amended
    prospectus therein and any registration statement for the same
    offering that is to be effective upon filing pursuant to
    Rule 462(b) under the Securities Act, and all other
    documents in connection therewith to be filed with the
    Securities and Exchange Commission, granting unto said
    attorneys-in-fact and agents, and each of them full power and
    authority to do and perform each and every act and thing
    requisite and necessary to be done in and about the premises, as
    fully to all intents and purposes as he might or could do in
    person, hereby ratifying and confirming all that said
    attorneys-in-fact as agents or any of them, or their substitute
    or substitutes, may lawfully do or cause to be done by virtue
    hereof.
 
    Pursuant to the requirements of the Securities Act of 1933, this
    Registration Statement and the Power of Attorney has been signed
    by the following persons in the capacities and on the dates
    indicated.
 
    |  |  |  |  |  |  |  | 
| 
    Signature
 |  | 
    Title
 |  | 
    Date
 | 
|  | 
|  |  |  |  |  | 
| /s/  Joseph
    P. Clayton (Joseph
    P. Clayton)
 |  | Chairman of the Board of Directors
    and Director |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  Mel
    Karmazin (Mel
    Karmazin)
 |  | Chief Executive Officer and
    Director (Principal Executive Officer) |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  David
    J. Frear (David
    J. Frear)
 |  | Executive Vice President and Chief
    Financial Officer (Principal Financial Officer |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  Adrienne
    E. Calderone (Adrienne
    E. Calderone)
 |  | Senior Vice President and
    Corporate Controller (Principal Accounting Officer) |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  Leon
    D. Black (Leon
    D. Black)
 |  | Director |  | July 24, 2007 | 
    
    II-4
 
    |  |  |  |  |  |  |  | 
| 
    Signature
 |  | 
    Title
 |  | 
    Date
 | 
|  | 
|  |  |  |  |  | 
| /s/  Lawrence
    F. Gilberti (Lawrence
    F. Gilberti)
 |  | Director |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  James
    P. Holden (James
    P. Holden)
 |  | Director |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  Warren
    N. Lieberfarb (Warren
    N. Lieberfarb)
 |  | Director |  | July 24, 2007 | 
|  |  |  |  |  | 
| /s/  James
    F. Mooney (James
    F. Mooney)
 |  | Director |  | July 24, 2007 | 
    
    II-5
 
    EXHIBIT INDEX
 
    |  |  |  |  |  | 
| Exhibit 
 |  |  | 
| 
    Number
 |  | 
    Exhibit Description
 | 
|  | 
|  | 2 | .1 |  | Agreement and Plan of Merger,
    dated as of February 19, 2007, by and among Sirius
    Satellite Radio Inc., Vernon Merger Corporation and XM Satellite
    Radio Holdings Inc. (incorporated by reference to
    Exhibit 2.1 of Sirius Satellite Radio Inc.s Current
    Report on
    Form 8-K
    filed on February 21, 2007). | 
|  | 3 | .1 |  | Amended and Restated Certificate
    of Incorporation of Sirius Satellite Radio Inc., dated
    March 4, 2003 (incorporated by reference to
    Exhibit 3.1 to Sirius Satellite Radio Inc.s Annual
    Report on
    Form 10-K
    for the year ended December 31, 2002). | 
|  | 3 | .2 |  | Form of Amendment to Amended and
    Restated Certificate of Incorporation of Sirius Satellite Radio
    Inc. (included as Annex D to the joint proxy
    statement/prospectus forming part of this Registration Statement
    and incorporated herein by reference). | 
|  | 3 | .3 |  | Form of certificate for shares of
    Common Stock of Sirius Satellite Radio Inc. (incorporated by
    reference to Exhibit 4.3 to Sirius Satellite Radio
    Inc.s Registration Statement on
    Form S-1
    (File
    No. 33-74782)). | 
|  | 3 | .4 |  | Amended and Restated By-Laws of
    Sirius Satellite Radio Inc. (incorporated by reference to
    Exhibit 3.2 to Sirius Satellite Radio Inc.s Quarterly
    Report on
    Form 10-Q
    for the quarter ended September 30, 2001). | 
|  | 5 | .1* |  | Opinion of Simpson
    Thacher & Bartlett LLP regarding legality of
    securities being registered. | 
|  | 8 | .1* |  | Opinion of Simpson
    Thacher & Bartlett LLP regarding certain U.S. income
    tax aspects of the merger. | 
|  | 8 | .2* |  | Opinion of Skadden, Arps, Slate,
    Meagher & Flom LLP regarding certain U.S. income tax
    aspects of the merger. | 
|  | 23 | .1** |  | Consent of Ernst & Young
    LLP. | 
|  | 23 | .2** |  | Consent of KPMG LLP. | 
|  | 23 | .4* |  | Consent of Simpson
    Thacher & Bartlett LLP (included as part of
    Exhibit 5.1). | 
|  | 23 | .5* |  | Consent of Simpson
    Thacher & Bartlett LLP (included as part of
    Exhibit 8.1). | 
|  | 23 | .6* |  | Consent of Skadden, Arps, Slate,
    Meagher & Flom LLP (included as part of
    Exhibit 8.2). | 
|  | 24 | .1** |  | Powers of Attorney for Sirius
    Satellite Radio Inc. (included on signature page). | 
|  | 99 | .1* |  | Form of Proxy for Sirius Satellite
    Radio Inc. | 
|  | 99 | .2* |  | Form of Proxy for XM Satellite
    Radio Holdings Inc. | 
|  | 99 | .3 |  | Opinion of Morgan
    Stanley & Co. Incorporated (included as Annex B
    to the joint proxy statement/prospectus forming part of this
    Registration Statement and incorporated herein by reference). | 
|  | 99 | .4 |  | Opinion of J.P. Morgan
    Securities Inc. (included as Annex C to the joint proxy
    statement/prospectus forming part of this Registration Statement
    and incorporated herein by reference). | 
|  | 99 | .5 |  | Consent of Morgan
    Stanley & Co. Incorporated (included as part of
    Exhibit 99.3). | 
|  | 99 | .6** |  | Consent of J.P. Morgan
    Securities Inc. | 
 
 
    |  |  |  | 
    | * |  | To be filed by amendment | 
|  | 
    | ** |  | Filed herewith |