tm2419963-1_defm14c - none

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	LIBERTY MEDIA CORPORATION 12300 Liberty Boulevard Englewood, Colorado 80112 (720) 875-5400			SIRIUS XM HOLDINGS INC. 1221 Avenue of the Americas, 35th Floor New York, New York 10020 (212) 584-5100

July 23, 2024

Dear Stockholder:

On behalf of the boards of directors of Liberty Media Corporation, a Delaware corporation (Liberty Media), and Sirius XM Holdings Inc., a Delaware corporation (Sirius XM Holdings), we are pleased to enclose the accompanying proxy statement/notice/prospectus/information statement (the materials) relating to the proposed transaction to combine Liberty Media’s Liberty SiriusXM Group with Sirius XM Holdings to form a new, consolidated, independent public company, which will continue to operate under Sirius XM Holdings’ name and brands. The new company will have no majority stockholder, a single class of shares outstanding and a board comprised of a majority of independent directors.

In the transaction, Liberty Media would separate the Liberty SiriusXM Group from Liberty Media by means of a redemptive split-off (the Split-Off) of Liberty Sirius XM Holdings Inc., a Delaware corporation and wholly owned subsidiary of Liberty Media (New Sirius). A wholly owned subsidiary of New Sirius will then merge with and into Sirius XM Holdings, Sirius XM Holdings will become a wholly owned subsidiary of New Sirius, and, in connection with the completion of the transactions, New Sirius will be renamed “Sirius XM Holdings Inc.” At the effective time of the Merger, Sirius XM Holdings will be renamed Sirius XM Inc.

Liberty Media, New Sirius and Sirius XM Holdings have entered into a Reorganization Agreement, dated as of December 11, 2023 (as may be amended from time to time, the Reorganization Agreement). The Reorganization Agreement governs, among other things, the terms and conditions of the Split-Off, pursuant to which all of the businesses, assets and liabilities attributed to the Liberty SiriusXM Group, including, among others, Liberty Media’s approximately 83% interest in Sirius XM Holdings, Liberty Media’s 3.75% Convertible Senior Notes due 2028, Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049, a margin loan obligation incurred by Liberty Media’s wholly owned special purpose subsidiary that will be repaid after the Split-Off in connection with the Merger, which is secured by shares of the common stock, par value $0.001 per share, of Sirius XM Holdings (Sirius XM Common Stock), and corporate cash, will be contributed to New Sirius and each outstanding share of Liberty Media’s Series A Liberty SiriusXM common stock, par value $0.01 per share (LSXMA), Series B Liberty SiriusXM common stock, par value $0.01 per share (LSXMB) and Series C Liberty SiriusXM common stock, par value $0.01 per share (LSXMK and, together with LSXMA and LSXMB, collectively, Liberty SiriusXM Common Stock) will be redeemed for such number of shares of common stock of New Sirius, par value $0.001 per share (New Sirius Common Stock), equal to the Exchange Ratio (as defined in the Reorganization Agreement and further described below) (the Exchange Ratio) (such redemption and exchange, the Redemption), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock.

Prior to the closing of the Split-Off and pursuant to the Reorganization Agreement, the Exchange Ratio (rounded to the nearest ten-thousandth) will be calculated based on (a) one-tenth (0.1) multiplied by (b)(i) the number of shares of Sirius XM Common Stock held by Liberty Media and its subsidiaries immediately prior to the Split-Off reduced by a net liabilities share adjustment, divided by (ii) the number of adjusted fully diluted shares of Liberty SiriusXM Common Stock after the close of the market on the date that is seven business days prior to the date of closing of the Redemption, as further described in the accompanying materials.

Liberty Media, Sirius XM Holdings, New Sirius and Radio Merger Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of New Sirius (Merger Sub), have also entered into an Agreement and Plan of Merger, dated as of December 11, 2023 (as may be amended from time to time, the Merger Agreement), pursuant to which, substantially concurrently with, but following, the completion of the Split-Off, Merger Sub will merge with and into Sirius XM Holdings (the Merger and, collectively with the Split-Off, the Transactions), with Sirius XM Holdings surviving the Merger as a wholly owned subsidiary of New Sirius.

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will be converted into the right to receive one-tenth (0.1) of a share of New Sirius Common Stock, with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock.

As a result of the Transactions, based on an estimated Exchange Ratio of approximately 0.83, which takes into account the amendment to the Exchange Ratio providing that it is multiplied by one-tenth (0.1) and which assumes that as of June 30, 2024, there will be approximately 3,846.6 million shares of Sirius XM Common Stock outstanding, approximately 353.1 million shares of Liberty SiriusXM Common Stock outstanding and approximately 3,205.8 million shares of Sirius XM Common Stock held by Liberty Media and its subsidiaries immediately prior to the Split-Off that, pursuant to the Exchange Ratio, is subject to reduction for an estimated net liabilities share adjustment of an amount of New Sirius Common Stock corresponding to approximately 274.8 million shares of Sirius XM Common Stock (which, based on the $4.23 reference price for shares of Sirius XM Common Stock, equates to approximately $1,163 million), we estimate that the former Sirius XM Holdings stockholders, in the aggregate but other than Liberty Media and its subsidiaries, will own approximately 19% of the outstanding shares of New Sirius Common Stock, with the former holders of Liberty SiriusXM Common Stock (in the aggregate) owning the remaining shares of New Sirius Common Stock, in each case, immediately following the completion of the Merger.

The New Sirius Common Stock is expected to be listed on the Nasdaq Global Select Market under Sirius XM Holdings’ current symbol, “SIRI”. If the Transactions are completed, each series of Liberty SiriusXM Common Stock will be delisted from the Nasdaq Global Select Market and will be deregistered under the Securities Exchange Act of 1934, as amended.

Liberty Media will hold a special meeting of its LSXMA and LSXMB stockholders at 10:15 a.m., Mountain time, on August 23, 2024 (the Liberty Special Meeting), at which meeting such stockholders will be asked to consider and vote on a proposal to approve the Redemption (the Split-Off Proposal). The Liberty Special Meeting will be held via the Internet and will be a completely virtual meeting of stockholders. LSXMA and LSXMB stockholders may attend the Liberty Special Meeting, access the LSXMA and LSXMB stockholders list, submit questions and vote their shares electronically during the meeting via the Internet by visiting www.virtualshareholdermeeting.com/LMC2024SM. To enter the Liberty Special Meeting, you will need the 16-digit control number that is printed in the box marked by the arrow on your proxy card. Liberty Media recommends logging in at least 15 minutes before the meeting to ensure that you are logged in when the meeting starts. Online check-in will start shortly before the meeting on August 23, 2024.

In connection with the Merger Agreement and as a condition of and material inducement to Sirius XM Holdings entering into the Merger Agreement, on December 11, 2023, certain entities affiliated with John C. Malone (the Malone Stockholders) entered into a Voting Agreement with Liberty Media, New Sirius and Sirius XM Holdings (the Voting Agreement). The Voting Agreement provides that, among other things, the Malone Stockholders have agreed, subject to the terms of the Voting Agreement, to vote their respective shares of LSXMA and LSXMB, representing approximately 48.3% of the total voting power of the issued and outstanding shares of LSXMA and LSXMB in the aggregate, in favor of the Split-Off Proposal and the transactions contemplated thereby, except that they will be obligated to vote shares representing approximately 33.37% of the total voting power of the issued and outstanding shares of LSXMA and LSXMB in the aggregate in favor thereof in the event that the board of directors of Liberty Media changes its recommendation related to the Split-Off and Sirius XM Holdings elects not to terminate the Merger Agreement.

We expect to complete the Split-Off and the Merger approximately two weeks after the Liberty Special Meeting (and the satisfaction of the other conditions in the Reorganization Agreement and the Merger Agreement) and we will announce the date and time of the Split-Off and the Merger shortly following the Liberty Special Meeting. Given that the completion of the Split-Off is a condition to the completion of the Merger, if the Split-Off Proposal is not approved, neither the Split-Off nor the Merger will be completed.

The Liberty Media board of directors has unanimously (a) approved and declared advisable and in the best interests of Liberty Media and its stockholders (including the holders of Liberty SiriusXM Common Stock) (i) the Split-Off and the transactions contemplated thereby (including the transactions contemplated by the Reorganization Agreement) and (ii) the Merger Agreement, each of the other transaction agreements to which Liberty Media is a party, and the transactions contemplated thereby, including the Merger, and (b) recommended that holders of LSXMA and LSXMB, voting together as a separate class, vote “FOR” the Split-Off Proposal.

A special committee comprised solely of independent directors of Sirius XM Holdings who are also independent of Liberty Media (the Special Committee) has unanimously approved, and declared advisable and in the best interests of Sirius XM Holdings and its stockholders (other than Liberty Media and its subsidiaries), and has recommended that the board of directors of Sirius XM Holdings approve, the Merger Agreement, each of the other transaction agreements to which Sirius XM Holdings is a party, and the transactions contemplated thereunder.

The board of directors of Sirius XM Holdings (following receipt of the recommendation of the Special Committee) has unanimously approved and declared advisable and in the best interests of Sirius XM Holdings and its stockholders (other than Liberty Media and its subsidiaries), the Merger Agreement, each of the other transaction agreements to which Sirius XM Holdings is a party, and the transactions contemplated thereunder and has recommended that the stockholders of Sirius XM Holdings (other than Liberty Media and its subsidiaries) adopt the Merger Agreement.

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The adoption of the Merger Agreement and, therefore, the approval of the Merger, required the affirmative vote of holders of a majority of the voting power of the outstanding shares of Sirius XM Common Stock entitled to vote on such matters. On December 11, 2023 and June 16, 2024, Liberty Radio, LLC, a Delaware limited liability company and wholly owned subsidiary of Liberty Media, which on such dates owned of record a majority of the issued and outstanding shares of Sirius XM Common Stock and held a majority of the voting power of capital stock of Sirius XM Holdings, delivered (a) an action by written consent authorizing, adopting and approving the Merger Agreement and the transactions contemplated thereby, including the Merger, which December 11, 2023 consent (the December 2023 Sirius XM Stockholder Written Consent) became effective immediately following the execution and delivery of the Merger Agreement by all parties thereto and (b) an action by written consent authorizing, adopting and approving the First Amendment to the Agreement and Plan of Merger and the transactions contemplated thereby, which June 16, 2024 consent (the June 2024 Sirius XM Stockholder Written Consent and, together with the December 2023 Sirius XM Stockholder Written Consent, the Sirius XM Stockholder Written Consents) became effective immediately following the execution and delivery of the First Amendment to the Agreement and Plan of Merger by all parties thereto. Accordingly, the delivery of the Sirius XM Stockholder Written Consents was sufficient to adopt the Merger Agreement and, therefore, approve the Merger, on behalf of Sirius XM Holdings’ stockholders. Sirius XM Holdings has not solicited and is not soliciting its stockholders’ adoption of the Merger Agreement or approval of the Merger.

No further action by any stockholder of Sirius XM Holdings is required under applicable law with respect to the adoption of the Merger Agreement or the approval of the Merger. In addition, while holders of LSXMA and LSXMB are being asked to vote on and approve the Split-Off Proposal in accordance with Liberty Media’s restated certificate of incorporation, no adoption of the Merger Agreement or approval of the Merger is required under applicable law by the holders of LSXMA or LSXMB to complete the Transactions.

The enclosed materials are being provided to the stockholders of Sirius XM Holdings for informational purposes only and shall constitute the notice required under Section 228(e) of the General Corporation Law of the State of Delaware in connection with the Sirius XM Stockholder Written Consents. The stockholders of Sirius XM Holdings are not being asked for a proxy, and are requested not to send a proxy.

LSXMA and LSXMB stockholders are encouraged by the Liberty Media board of directors to vote “FOR” both of the proposals presented and further described in the accompanying materials.

Liberty Media is seeking approval from holders of LSXMA and LSXMB of the Split-Off Proposal (together with the Adjournment Proposal (as defined below)). The vote of LSXMA and LSXMB stockholders is important, regardless of the number of shares owned. Whether or not you plan to attend the Liberty Special Meeting, please vote as soon as possible to make sure that your shares are represented.

We look forward to the successful combination of the Liberty SiriusXM Group and Sirius XM Holdings.

Very truly yours,

Gregory B. Maffei
President and Chief Executive Officer
Liberty Media

Jennifer C. Witz
Chief Executive Officer
Sirius XM Holdings

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of any of the proposals or the securities being offered in the Split-Off or the Merger or has passed upon the adequacy or accuracy of the accompanying materials. Any representation to the contrary is a criminal offense.

Investing in the securities of New Sirius, Sirius XM Holdings or Liberty Media involves risks. See “Risk Factors” beginning on page 43 of the materials.

The accompanying materials are dated July 23, 2024 and are first being mailed to holders of shares of LSXMA and LSXMB on or about July 24, 2024 to the stockholders of record as of 5:00 p.m., New York City time, on July 17, 2024.

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LIBERTY MEDIA CORPORATION
12300 Liberty Boulevard
Englewood, Colorado 80112
(720) 875-5400

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
to be Held on August 23, 2024

NOTICE IS HEREBY GIVEN of the special meeting of LSXMA and LSXMB stockholders of Liberty Media Corporation (Liberty Media) to be held at 10:15 a.m., Mountain time, on August 23, 2024 (the Liberty Special Meeting). The Liberty Special Meeting will be held via the Internet and will be a completely virtual meeting of stockholders to consider and vote on the following proposals:

A proposal (the Split-Off Proposal) to approve the redemption by Liberty Media of each outstanding share of Liberty Media’s Series A Liberty SiriusXM common stock, par value $0.01 per share (LSXMA), Series B Liberty SiriusXM common stock, par value $0.01 per share (LSXMB) and Series C Liberty SiriusXM common stock, par value $0.01 per share (LSXMK and, together with LSXMA and LSXMB, collectively, Liberty SiriusXM Common Stock) for such number of shares of common stock, par value $0.001 per share (New Sirius Common Stock), of a wholly owned subsidiary of Liberty Media, Liberty Sirius XM Holdings Inc., a Delaware corporation (New Sirius), equal to the Exchange Ratio (as defined in the Reorganization Agreement, dated as of December 11, 2023 (as may be amended from time to time, the Reorganization Agreement), by and among Liberty Media, New Sirius and Sirius XM Holdings Inc., a Delaware corporation (Sirius XM Holdings), and as further described below) (such redemption and exchange, the Redemption), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock. Prior to the Redemption, all of the businesses, assets and liabilities attributed to the Liberty SiriusXM Group will be contributed to and assumed by New Sirius (the Contribution). We refer to the Contribution, the Redemption and the resulting separation of New Sirius from Liberty Media pursuant to the Contribution and Redemption as the Split-Off. After the Split-Off, New Sirius will hold all of the businesses, assets and liabilities attributed to Liberty Media’s Liberty SiriusXM Group, including, among others, Liberty Media’s approximately 83% interest in Sirius XM Holdings, Liberty Media’s 3.75% Convertible Senior Notes due 2028, Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049, a margin loan obligation incurred by Liberty Media’s wholly owned special purpose subsidiary that will be repaid after the Split-Off in connection with the Merger, which is secured by shares of the common stock, par value $0.001 per share, of Sirius XM Holdings (Sirius XM Common Stock), and corporate cash. Prior to the closing of the Split-Off and pursuant to the Reorganization Agreement, the Exchange Ratio (rounded to the nearest ten-thousandth) will be calculated based on (a) one-tenth (0.1) multiplied by (b)(i) the number of shares of Sirius XM Common Stock held by Liberty Media and its subsidiaries (including New Sirius and its subsidiaries) immediately prior to the Split-Off reduced by a net liabilities share adjustment, divided by (ii) the number of adjusted fully diluted shares of Liberty SiriusXM Common Stock after the close of the market on the date that is seven business days prior to the date of closing of the Redemption as further described in the accompanying proxy statement/notice/prospectus/information statement (the materials).

A proposal (the Adjournment Proposal) to approve the adjournment of the Liberty Special Meeting by Liberty Media from time to time to solicit additional proxies in favor of the Split-Off Proposal, if there are insufficient votes at the time of such adjournment to approve the Split-Off Proposal or if otherwise determined by the chairperson of the meeting to be necessary or appropriate.

If the Split-Off Proposal is approved, then, subject to certain other conditions, substantially concurrently with, but following, the completion of the Split-Off, a wholly owned subsidiary of New Sirius will merge with and into Sirius XM Holdings (the Merger and together with the Split-Off, the Transactions), Sirius XM Holdings will become a wholly owned subsidiary of New Sirius, and, in connection with the completion of the Transactions, New Sirius will be renamed “Sirius XM Holdings Inc.” At the effective time of the Merger,

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Sirius XM Holdings will be renamed Sirius XM Inc. The Merger will not be completed if the Split-Off Proposal is not approved or if the Split-Off is otherwise not consummated.

Liberty Media will transact no other business at the Liberty Special Meeting, except such business as may properly be brought before the Liberty Special Meeting or any adjournments or postponements thereof by or at the direction of the Liberty Media board of directors in accordance with Liberty Media’s amended and restated bylaws. The accompanying materials describe the proposals listed above in more detail. Please refer to the materials, including the form of the proposed amended and restated New Sirius certificate of incorporation and bylaws and all other annexes and any documents incorporated by reference, for further information with respect to the business to be transacted at the Liberty Special Meeting. You are encouraged to read the entire document carefully before voting. In particular, please see “Risk Factors” beginning on page 43 of the materials for an explanation of the risks associated with the Transactions.

Holders of record of LSXMA and LSXMB, in each case, outstanding as of 5:00 p.m., New York City time, on July 17, 2024, the record date for the Liberty Special Meeting, will be entitled to notice of the Liberty Special Meeting and to vote on the proposals, as applicable, at the Liberty Special Meeting or any adjournment or postponement thereof. None of Liberty Media’s certificate of incorporation, Liberty Media’s bylaws nor the laws of the State of Delaware require the approval of the holders of shares of LSXMK, or the holders of shares of Liberty Media’s Series A Liberty Formula One common stock, par value $0.01 per share, Series B Liberty Formula One common stock, par value $0.01 per share, Series C Liberty Formula One common stock, par value $0.01 per share, Series A Liberty Live common stock, par value $0.01 per share, Series B Liberty Live common stock, par value $0.01 per share, or Series C Liberty Live common stock, par value $0.01 per share, to consummate the Redemption.

The proposals described above require the following stockholder approvals:

•

The Split-Off Proposal requires the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class. Pursuant to Liberty Media’s restated certificate of incorporation, with respect to the Split-Off Proposal, each holder of record of LSXMA is entitled to one vote per share and each holder of record of LSXMB is entitled to ten votes per share.

•

The Adjournment Proposal requires the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class. Pursuant to Liberty Media’s restated certificate of incorporation, with respect to the Adjournment Proposal, each holder of record of LSXMA is entitled to one vote per share and each holder of record of LSXMB is entitled to ten votes per share.

The Liberty Media board of directors has approved each proposal, and recommends that the holders of LSXMA and LSXMB vote “FOR” each proposal.

Liberty Media is seeking approval from holders of LSXMA and LSXMB of each of the Split-Off Proposal and the Adjournment Proposal. You are encouraged to vote “FOR” both of the proposals presented and further described in the accompanying proxy statement/notice/prospectus/information statement. While holders of LSXMA and LSXMB are being asked to vote on and approve the Split-Off Proposal in accordance with Liberty Media’s restated certificate of incorporation, no adoption of the Merger Agreement or approval of the Merger is required under applicable law by the holders of LSXMA or LSXMB.

A list of stockholders entitled to vote at the Liberty Special Meeting will be available at Liberty Media’s offices in Englewood, Colorado for review by such stockholders for any purpose germane to the Liberty Special Meeting for at least ten days prior to the Liberty Special Meeting.

You may cast your vote electronically during the Liberty Special Meeting via the Internet or by proxy prior to the meeting via the Internet, by telephone, or by mail. You may attend the Liberty Special Meeting, access the stockholders list, submit questions and vote your shares electronically during the meeting via the Internet by visiting www.virtualshareholdermeeting.com/LMC2024SM. To enter the Liberty Special Meeting, you will need the 16-digit control number that is printed in the box marked by the arrow on your

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SIRIUS XM HOLDINGS INC.
1221 Avenue of the Americas, 35th Floor
New York, New York 10020

NOTICE OF ACTION BY WRITTEN CONSENT
AND
INFORMATION STATEMENT

WE ARE NOT ASKING YOU FOR A PROXY
AND YOU ARE REQUESTED NOT TO SEND US A PROXY

To Sirius XM Holdings Stockholders:

This notice of written consent and information statement is being furnished to the holders of common stock, par value $0.001 per share (Sirius XM Common Stock), of Sirius XM Holdings Inc., a Delaware corporation (Sirius XM Holdings), in connection with the proposed transaction between Liberty Media Corporation, a Delaware corporation (Liberty Media), and Sirius XM Holdings, pursuant to which Liberty Media will separate the Liberty SiriusXM Group from Liberty Media by means of a redemptive split-off (the Split-Off) of Liberty Sirius XM Holdings Inc., a Delaware corporation and wholly owned subsidiary of Liberty Media (New Sirius). A wholly owned subsidiary of New Sirius will then merge with and into Sirius XM Holdings (the Merger and, collectively with the Split-Off, the Transactions), Sirius XM Holdings will become a wholly owned subsidiary of New Sirius, and, in connection with the completion of the Transactions, New Sirius will be renamed “Sirius XM Holdings Inc.” At the effective time of the Merger, Sirius XM Holdings will be renamed Sirius XM Inc.

In connection with the Transactions, Liberty Media, Sirius XM Holdings, New Sirius and Radio Merger Sub, LLC, a Delaware limited liability company and wholly owned subsidiary of New Sirius (Merger Sub), have entered into an Agreement and Plan of Merger, dated as of December 11, 2023 (as may be amended from time to time, the Merger Agreement), pursuant to which, substantially concurrently with, but following, the completion of the Split-Off, the Merger will be effected, with Sirius XM Holdings surviving the Merger as a wholly owned subsidiary of New Sirius.

Upon completion of the Merger, each share of Sirius XM Common Stock issued and outstanding immediately prior to the effective time of the Merger (other than shares beneficially owned by Sirius XM Holdings or New Sirius or any of its subsidiaries) will be converted into the right to receive one-tenth (0.1) of a share of common stock of New Sirius, par value $0.001 per share (New Sirius Common Stock).

Liberty Media, New Sirius and Sirius XM Holdings have also entered into a Reorganization Agreement, dated as of December 11, 2023 (as may be amended from time to time, the Reorganization Agreement). The Reorganization Agreement governs, among other things, the terms and conditions of the Split-Off, pursuant to which all of the businesses, assets and liabilities attributed to the Liberty SiriusXM Group, including, among others, Liberty Media’s approximately 83% interest in Sirius XM Holdings, Liberty Media’s 3.75% Convertible Senior Notes due 2028, Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049, a margin loan obligation incurred by Liberty Media’s wholly owned special purpose subsidiary that will be repaid after the Split-Off in connection with the Merger, which is secured by shares of Sirius XM Common Stock, and corporate cash, will be contributed to New Sirius (the Contribution) and each outstanding share of Liberty Media’s Series A Liberty SiriusXM common stock, par value $0.01 per share (LSXMA), Series B Liberty SiriusXM common stock, par value $0.01 per share (LSXMB) and Series C Liberty SiriusXM common stock, par value $0.01 per share (LSXMK and, together with LSXMA and LSXMB, collectively, Liberty SiriusXM Common Stock) will be redeemed for such number of shares of New Sirius Common Stock equal to the Exchange Ratio (as defined in the Reorganization Agreement and further described below), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock.

The Split-Off is subject to the approval of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at a special meeting of Liberty Media’s LSXMA and LSXMB stockholders, voting together as a separate class. The Merger will not be completed if the Split-Off Proposal is not approved or the Split-Off is otherwise not consummated.

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A special committee comprised solely of independent directors of Sirius XM Holdings who are also independent of Liberty Media (the Special Committee) has unanimously approved, and declared advisable and in the best interests of Sirius XM Holdings and its stockholders (other than Liberty Media and its subsidiaries) and has recommended that the board of directors of Sirius XM Holdings approve, the Merger Agreement, each of the other transaction agreements to which Sirius XM Holdings is a party, and the transactions contemplated thereunder.

The adoption of the Merger Agreement and, therefore, the approval of the Merger required the affirmative vote of holders of a majority of the voting power of the outstanding shares of Sirius XM Common Stock entitled to vote on such matters. On December 11, 2023 and June 16, 2024, Liberty Radio, LLC, a Delaware limited liability company and wholly owned subsidiary of Liberty Media, which on such dates owned of record a majority of the issued and outstanding shares of Sirius XM Common Stock and held a majority of the voting power of capital stock of Sirius XM Holdings, delivered (a) an action by written consent authorizing, adopting and approving the Merger Agreement and the transactions contemplated thereby, including the Merger, which December 11, 2023 consent (the December 2023 Sirius XM Stockholder Written Consent) became effective immediately following the execution and delivery of the Merger Agreement by all parties thereto and (b) an action by written consent authorizing, adopting and approving the First Amendment to the Agreement and Plan of Merger and the transactions contemplated thereby, which June 16, 2024 consent (the June 2024 Sirius XM Stockholder Written Consent and, together with the December 2023 Sirius XM Stockholder Written Consent, the Sirius XM Stockholder Written Consents) became effective immediately following the execution and delivery of the First Amendment to the Agreement and Plan of Merger by all parties thereto. As a result, no further action by any stockholder of Sirius XM Holdings is required under applicable law or the Merger Agreement (or otherwise) to adopt the Merger Agreement or approve the transactions contemplated thereby, including the Merger, and Sirius XM Holdings will not be soliciting your vote for or consent to the adoption of the Merger Agreement and the approval of the transactions contemplated thereby and will not call a stockholders’ meeting for purposes of voting on the adoption of the Merger Agreement and the approval of the transactions contemplated thereby.

Additionally, at the recommendation of the board of directors of Sirius XM Radio Inc., a Delaware corporation and wholly owned subsidiary of Sirius XM Holdings (Sirius XM Radio), pursuant to the December 2023 Sirius XM Stockholder Written Consent, Liberty Radio, LLC approved the amendment and restatement of the certificate of incorporation of Sirius XM Radio to (a) reduce its number of authorized shares of common stock, par value $0.001, from 9,000,000,000 to 1,000 and remove the 50,000,000 authorized shares of preferred stock, par value $0.001 (and related references to preferred stock), and (b) remove the provision that provides that any act or transaction by Sirius XM Radio that requires for its adoption the approval of the stockholders of Sirius XM Radio shall, pursuant to Section 251(g)(7)(i) of the General Corporation Law of the State of Delaware, require, in addition, the approval of the stockholders of Sirius XM Holdings by removing the twelfth article of the existing amended and restated certificate of incorporation of Sirius XM Radio (collectively, the Radio Charter Amendment). The adoption of the Radio Charter Amendment required the affirmative vote of holders of a majority of the voting power of the outstanding shares of Sirius XM Common Stock entitled to vote on such matters.

This notice and the accompanying information statement shall constitute notice to you from Sirius XM Holdings of the Sirius XM Stockholder Written Consents contemplated by Section 228(e) of the General Corporation Law of the State of Delaware.

In accordance with Rule 14c-2 and Rule 14a-16 of the Securities Exchange Act of 1934, as amended, the Merger and the Radio Charter Amendment will become effective no earlier than the 40th calendar day after the Notice of Internet Availability of Information Statement (the Notice) is made available to Sirius XM stockholders. The Notice is being distributed and made available on or about July 24, 2024.

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ABOUT THIS PROXY STATEMENT/NOTICE/PROSPECTUS/INFORMATION STATEMENT

This proxy statement/notice/prospectus/information statement, which forms part of a registration statement on Form S-4 (File No. 333-276758) filed with the Securities and Exchange Commission (the SEC) by Liberty Sirius XM Holdings Inc., a Delaware corporation and wholly owned subsidiary of Liberty Media and which is referred to as New Sirius, constitutes a proxy statement under Section 14(a) of the Securities Exchange Act of 1934, as amended (the Exchange Act), and a notice of meeting and action to be taken with respect to the Liberty Special Meeting of stockholders at which certain Liberty Media stockholders will consider and vote on the Split-Off Proposal and the other proposal described in this proxy statement/notice/prospectus/information statement. It also constitutes a prospectus of New Sirius under Section 5 of the Securities Act of 1933, as amended (the Securities Act), with respect to the shares of New Sirius Common Stock to be issued to certain stockholders of Liberty Media and Sirius XM Holdings, respectively, pursuant to the Reorganization Agreement and the Merger Agreement. In addition, it constitutes an information statement under Section 14(c) of the Exchange Act to provide Sirius XM Holdings stockholders with notice of the Sirius XM Stockholder Written Consents and material information concerning the actions taken in connection with the Sirius XM Stockholder Written Consents as contemplated by Section 228(e) of the General Corporation Law of the State of Delaware.

This proxy statement/notice/prospectus/information statement describes the businesses and assets of New Sirius as though they were its businesses, assets and liabilities for all historical periods described. However, New Sirius is a newly formed entity that will not have conducted any operations prior to the Split-Off and instead will have the businesses, assets and liabilities of the Liberty SiriusXM Group contributed to it prior to the Split-Off and will become the sole owner (directly or indirectly) of the equity interests in Sirius XM Holdings (as the surviving corporation) following the Merger. Unless otherwise specified herein, references in this proxy statement/notice/prospectus/information statement to the historical assets, liabilities, businesses or activities of New Sirius’ businesses or the businesses in which it has interests are intended to refer to the historical assets, liabilities, businesses or activities as they were conducted or held by the Liberty SiriusXM Group prior to the Split-Off. Upon completion of the Split-Off, New Sirius will be an independent company and Liberty Media will have no continuing stock ownership in New Sirius and upon completion of the Merger, Sirius XM Holdings will be a wholly owned subsidiary of New Sirius. This proxy statement/notice/prospectus/information statement contains, incorporates by reference or includes as an annex certain historical financial information of Liberty Media and Sirius XM Holdings as well as certain historical financial information relating to the business, assets and liabilities of New Sirius upon the completion of the Transactions. This historical financial information is not necessarily indicative of Liberty Media’s or New Sirius’ future financial position, future results of operations or future cash flows, nor does it reflect what the financial position, results of operations or cash flows of New Sirius would have been had it been operated as a stand-alone company with Sirius XM Holdings as a wholly owned subsidiary during the periods presented.

Information contained in, incorporated by reference in or included as an Annex to this proxy statement/notice/prospectus/information statement relating to Liberty Media and New Sirius has been supplied by Liberty Media. Information contained in, incorporated by reference in or included as an Annex to this proxy statement/notice/prospectus/information statement relating to Sirius XM Holdings has been supplied by Sirius XM Holdings. Liberty Media and Sirius XM Holdings have both contributed information relating to the Split-Off and the Merger. You should rely only on the information contained in, incorporated by reference in or included as an Annex to this proxy statement/notice/prospectus/information statement. No person has been authorized to provide you with information that is different from what is contained in, incorporated by reference in or included as an Annex to, this proxy statement/notice/prospectus/information statement, and, if given or made by any person, such information must not be relied upon as having been authorized. You should not assume that the information contained in this proxy statement/notice/prospectus/information statement is accurate as of any date other than the date set forth on the cover page of this proxy statement/notice/prospectus/information statement or as otherwise specifically set forth herein. Changes to the information contained herein may occur after that date and none of New Sirius, Liberty Media or Sirius XM Holdings undertake any obligation to update the information unless required to do so by law. Further, you should not assume that the information incorporated by reference into this proxy statement/notice/prospectus/information statement is accurate as of any date other than the date of the incorporated document. Any statement contained in a document incorporated or deemed to be incorporated

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by reference into this document will be deemed to be modified or superseded to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference into this document modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this document. Neither the mailing of this document to the holders of shares of LSXMA and LSXMB or the stockholders of Sirius XM Holdings, nor the issuance of New Sirius Common Stock pursuant to the Reorganization Agreement and/or Merger Agreement, will create any implication to the contrary.

ADDITIONAL INFORMATION

This proxy statement/notice/prospectus/information statement incorporates important business and financial information from other documents that are not included in or delivered with this proxy statement/notice/prospectus/information statement. For a listing of the documents incorporated by reference into this proxy statement/notice/prospectus/information statement, see “Additional Information — Where You Can Find More Information.” This information is available to you without charge upon your written or oral request. You can obtain copies of documents filed with the SEC, including the documents incorporated by reference in this proxy statement/notice/prospectus/information statement, through the SEC website at www.sec.gov or by writing or telephoning the office of Investor Relations of the appropriate company at the following addresses and telephone numbers:

Liberty Media Corporation
12300 Liberty Boulevard
Englewood, Colorado 80112
Telephone: (720) 875-5400

Sirius XM Holdings Inc.
1221 Avenue of the Americas, 35th Floor
New York, New York 10020
Telephone: (212) 584-5100

If you would like to request any documents, please do so at least five business days before the date of the Liberty Special Meeting (i.e., by August 16, 2024), in order to receive them before the Liberty Special Meeting.

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QUESTIONS AND ANSWERS

The questions and answers below highlight only selected information about the Split-Off, the Liberty Special Meeting and the Merger. You should read carefully the entire proxy statement/notice/prospectus/information statement, including the Annexes and the additional documents incorporated by reference herein, because the information in this section does not provide all of the information that might be important to you with respect to the Split-Off, the Liberty Special Meeting or the Merger.

What is the Split-Off and what is the Split-Off Proposal for which holders of shares of LSXMA and LSXMB are being asked to vote?

Liberty Media, Sirius XM Holdings and New Sirius have entered into a Reorganization Agreement, dated as of December 11, 2023 (as amended by the First Amendment to the Reorganization Agreement, dated as of June 16, 2024 (the First Amendment to the Reorganization Agreement), and as may be further amended from time to time, the Reorganization Agreement), pursuant to which and except as set forth therein, all of the businesses, assets and liabilities attributed to the Liberty SiriusXM Group will be contributed to New Sirius (the Contribution) and each outstanding share of Liberty SiriusXM Common Stock will be redeemed for such number of shares of New Sirius Common Stock equal to the Exchange Ratio (as defined in the Reorganization Agreement and further described below) (such redemption and exchange, the Redemption), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock. The Redemption will be effected in accordance with the terms of Liberty Media’s restated certificate of incorporation (Liberty Media’s certificate of incorporation).

The Contribution, the Redemption and the resulting separation of New Sirius from Liberty Media pursuant to the Reorganization Agreement are referred to as the Split-Off. After the Split-Off, except as set forth in the Reorganization Agreement, New Sirius will hold all of the businesses, assets and liabilities attributed to the Liberty SiriusXM Group, including, among others (1) all of Liberty Media’s direct and indirect interest in Sirius XM Holdings (which currently represents approximately 83% of the outstanding shares of common stock, par value $0.001 per share, of Sirius XM Holdings (Sirius XM Common Stock)), (2) corporate cash, (3) Liberty Media’s 3.75% Convertible Senior Notes due 2028, (4) Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049 and (5) a margin loan obligation incurred by Liberty Media’s wholly owned special purpose subsidiary that will be repaid after the Split-Off in connection with the Merger, which is secured by shares of Sirius XM Common Stock (the Margin Loan).

Liberty Media will hold a special meeting of its LSXMA and LSXMB stockholders at 10:15 a.m., Mountain time, on August 23, 2024 (the Liberty Special Meeting), at which meeting such stockholders will be asked to consider and vote on a proposal to approve the Redemption (the Split-Off Proposal). The Split-Off Proposal requires the affirmative vote of the holders of record of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class (the Liberty Split-Off Stockholder Approval). With respect to the Split-Off Proposal, each holder of record of LSXMA is entitled to one vote per share and each holder of record of LSXMB is entitled to ten votes per share. For more information, see “The Proposed Transactions” and “The Split-Off Proposal” below.

Completion of the Split-Off is conditioned on, among other things, the holders of LSXMA and LSXMB, voting together as a separate class, approving the Split-Off Proposal. The completion of the Split-Off is not conditioned on the approval of the Adjournment Proposal.

In connection with the transactions contemplated by the Merger Agreement and the Reorganization Agreement, on December 11, 2023, The John C. Malone 1995 Revocable Trust, The Leslie A. Malone 1995 Revocable Trust, The Malone Family Land Preservation Foundation and the John C. Malone June 2003 Charitable Remainder Unitrust (the Malone Stockholders) entered into a voting agreement with Liberty Media, Sirius XM Holdings and New Sirius (the Voting Agreement). Pursuant to the Voting Agreement, the Malone Stockholders agreed to vote their respective shares of LSXMA and LSXMB owned by them, representing approximately 48.3% of the total voting power of the issued and outstanding

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shares of LSXMA and LSXMB as of April 30, 2024, in favor of the Split-Off Proposal and the transactions contemplated thereby, except that the Malone Stockholders will be obligated to vote shares representing approximately 33.37% of the total voting power of the issued and outstanding shares of LSXMA and LSXMB in the aggregate in favor thereof in the event that the Liberty Media board of directors makes a Liberty Adverse Recommendation Change (as defined below) and Sirius XM Holdings elects not to terminate the Merger Agreement. For more information, see “Transaction Agreements — Voting Agreement” below.

What is the Merger and are the holders of Sirius XM Common Stock being asked to vote on the Merger?

On December 11, 2023, Liberty Media, Sirius XM Holdings, New Sirius and Radio Merger Sub, LLC, a Delaware limited liability company and a newly formed wholly owned subsidiary of New Sirius (Merger Sub), entered into an Agreement and Plan of Merger (as amended by the First Amendment to the Agreement and Plan of Merger, dated as of June 16, 2024 (the First Amendment to the Agreement and Plan of Merger and, together with the First Amendment to the Reorganization Agreement, the First Amendments), and as may be further amended from time to time, the Merger Agreement), pursuant to which, substantially concurrently with, but following, the time at which the Split-Off is completed (the Split-Off Effective Time), Merger Sub will merge with and into Sirius XM Holdings (the Merger and, collectively with the Split-Off, the Transactions), with Sirius XM Holdings surviving the Merger (the Surviving Corporation) as a wholly owned subsidiary of New Sirius. Upon completion of the Merger (if the Merger is completed), each share of Sirius XM Common Stock issued and outstanding immediately prior to the effective time of the Merger (the Merger Effective Time) will be converted into the right to receive one-tenth (0.1) of a share of New Sirius Common Stock (collectively, the Merger Consideration), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock. However, the Merger Consideration will not be paid in respect of any shares of Sirius XM Common Stock issued and outstanding immediately prior to the Merger Effective Time (a) that are beneficially owned by Sirius XM Holdings (Treasury Shares) or (b) that are beneficially owned by New Sirius or any of its subsidiaries (the Liberty Owned SiriusXM Shares), which, in the case of the shares described in clause (a) will be canceled and no consideration will be delivered in exchange therefor and, in the case of the shares described in clause (b), each share will be converted into one share of common stock, par value $0.001 per share, of the Surviving Corporation (the Surviving Corporation Common Stock). Pursuant to the Merger Agreement, all of the limited liability company interests of Merger Sub issued and outstanding immediately prior to the Merger Effective Time will be automatically converted and divided into that number of shares of the Surviving Corporation Common Stock equal to, in the aggregate, the number of shares of Sirius XM Common Stock outstanding immediately prior to the Merger Effective Time, excluding the Liberty Owned SiriusXM Shares and Treasury Shares.

The adoption of the Merger Agreement and the approval of the Merger and the other transactions contemplated by the Merger Agreement require the affirmative vote or written consent of the holders of a majority of the aggregate voting power of the shares of Sirius XM Common Stock that are entitled to vote pursuant to Section 228 and Section 264 of the General Corporation Law of the State of Delaware (the DGCL). On December 11, 2023 and June 16, 2024, Liberty Radio, LLC, a Delaware limited liability company and wholly owned subsidiary of Liberty Media (Liberty Radio), which on such dates owned of record a majority of the issued and outstanding shares of Sirius XM Common Stock and held a majority of the voting power of capital stock of Sirius XM Holdings, delivered (a) an action by written consent authorizing, adopting and approving the Merger Agreement and the transactions contemplated thereby, including the Merger, which December 11, 2023 consent (the December 2023 Sirius XM Stockholder Written Consent) became effective immediately following the execution and delivery of the Merger Agreement by all parties thereto and (b) an action by written consent authorizing, adopting and approving the First Amendment to the Agreement and Plan of Merger and the transactions contemplated thereby, which June 16, 2024 consent (the June 2024 Sirius XM Stockholder Written Consent and, together with the December 2023 Sirius XM Stockholder Written Consent, the Sirius XM Stockholder Written Consents) became effective immediately following the execution and delivery of the First Amendment to the Agreement and Plan of Merger by all parties thereto. As a result, no further action by any stockholder of Sirius XM Holdings is required under applicable law or the

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Merger Agreement (or otherwise) to adopt the Merger Agreement or approve the transactions contemplated thereby, including the Merger, and Sirius XM Holdings will not be soliciting a vote for or consent to the adoption of the Merger Agreement and the approval of the transactions contemplated thereby and will not call a stockholders’ meeting for purposes of voting on the adoption of the Merger Agreement and the approval of the transactions contemplated thereby. For more information about the Merger, see “The Proposed Transactions” below.

What will the holders of Liberty Media common stock receive as a result of the Split-Off?

If the Split-Off is effected, on the date on which the Redemption occurs (Split-Off Effective Date), each outstanding share of LSXMA, LSXMB and LSXMK will be redeemed for a number of shares of New Sirius Common Stock equal to the Exchange Ratio, with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock. Holders of shares of (a) Liberty Media’s Series A Liberty Formula One common stock, par value $0.01 per share (FWONA), Series B Liberty Formula One common stock, par value $0.01 per share (FWONB), and Series C Liberty Formula One common stock, par value $0.01 per share (FWONK and, together with FWONA and FWONB, collectively, Liberty Formula One Common Stock) and/or (b) Liberty Media’s Series A Liberty Live common stock, par value $0.01 per share (LLYVA), Series B Liberty Live common stock, par value $0.01 per share (LLYVB), and Series C Liberty Live common stock, par value $0.01 per share (LLYVK and, together with LLYVA and LLYVB, collectively, Liberty Live Common Stock), in each case, will not receive any new or additional shares or other consideration pursuant to the Split-Off.

Why have the parties entered into the First Amendment to the Reorganization Agreement and the First Amendment to the Agreement and Plan of Merger?

The parties have entered into the First Amendment to the Reorganization Agreement and the First Amendment to the Agreement and Plan of Merger to, among other things, amend the Exchange Ratio and the SiriusXM Exchange Ratio (as defined below), respectively, which are (a) intended to preserve the economics of the Transactions announced in December 2023, while reducing the number of shares of New Sirius Common Stock that would be outstanding immediately after the closing of the Transactions and (b) expected to more closely align the nominal share price of New Sirius Common Stock outstanding immediately after the closing of the Transactions with the price of the shares of Liberty SiriusXM Common Stock being redeemed in the Split-Off, and increase the nominal price per share of New Sirius Common Stock, which is designed to help improve trading dynamics in the stock and potentially increase its attractiveness to investors. In connection with such amendment to the SiriusXM Exchange Ratio, the First Amendment to the Agreement and Plan of Merger provides that cash (without interest) will be paid in lieu of issuing any fractional shares of New Sirius Common Stock in the Merger.

In addition, the parties entered into the First Amendment to the Reorganization Agreement and the First Amendment to the Agreement and Plan of Merger to, among other things, amend the Restructuring (as defined below) to provide for, among other things, the conversion of Sirius XM Radio Inc., a Delaware corporation and a wholly owned subsidiary of Sirius XM Holdings (Sirius XM Radio), to Sirius XM Radio LLC, a Delaware limited liability company, in accordance with the DGCL and the Delaware Limited Liability Company Act (the Conversion), to provide that the completion of the Conversion be a condition to closing of the Split-Off and to provide for the prior approval of the Conversion by the United States Federal Communications Commission (the FCC) be a condition to the closing of the Merger.

How is the Exchange Ratio calculated?

Prior to the closing of the Split-Off and pursuant to the Reorganization Agreement, the Exchange Ratio, which will be rounded to the nearest ten-thousandth, will be calculated based on (a) one-tenth (0.1) multiplied by (b)(i) the number of shares of Sirius XM Common Stock held by Liberty Media and its subsidiaries (including New Sirius and its subsidiaries) immediately prior to the Split-Off reduced by a net liabilities share adjustment, divided by (ii) the number of adjusted fully diluted shares of Liberty SiriusXM Common Stock after the close of the market on the date that is seven business days prior to

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the date of closing of the Redemption (the Measurement Date) calculated based on the treasury stock method. The net liabilities share adjustment, which will be calculated after the close of the market on the Measurement Date, will equal a number of shares based on the following formula as set forth in the Reorganization Agreement:

•

the net debt attributed to the Liberty SiriusXM Group, which equals the indebtedness attributed to the Liberty SiriusXM Group (excluding Liberty Media’s 3.75% Convertible Senior Notes due 2028, but including Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049 and the Margin Loan) less the cash and cash equivalents attributed to the Liberty SiriusXM Group (subject to certain reductions for estimated corporate overhead and similar expenses expected to be incurred between the Measurement Date and the closing of the Split-Off); plus

•

certain financing costs, excluding any fees in excess of the amounts specified in the Debt Commitment Letter (as defined below), the Engagement Letters (as defined below) or a fee letter entered into in connection with the Debt Commitment Letter (the SIRI Fee Letter) that may be required in connection with the Transactions; plus

•

a net adjustment equal to the sum of certain tax liabilities attributed to the Liberty SiriusXM Group, reduced by certain tax benefits attributed to the Liberty SiriusXM Group; plus

•

unpaid advisor and service provider fees, costs and expenses of Liberty Media incurred in connection with the Transactions (including an estimate of such fees, costs and expenses expected to be incurred between the Measurement Date and the closing of the Split-Off); plus

•

the aggregate fair value (as of the grant date) of any Liberty SiriusXM option awards granted after the date of the Reorganization Agreement; plus

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50% of the filing fees paid in connection with obtaining approval of the Transactions under the Communications Act of 1934, as amended (the Communications Act); minus

•

16.5% of the SEC filing fees arising from the filing of this proxy statement/notice/prospectus/information statement with the SEC;

with the result of the above divided by $4.23, which represents the average of the daily volume-weighted average trading price (VWAP) of shares of Sirius XM Common Stock for the twenty consecutive trading days ending on September 25, 2023, the day before Liberty Media publicly disclosed that it had communicated a proposal to the Special Committee (as defined below) outlining the terms of a proposed combination. As a result of the Order and Final Judgment (as defined below) and the prior deposit of the required payment pursuant to the Agreed Settlement (as defined below) into escrow for the benefit of the applicable parties in the Specified Litigation Matter (as defined below) in accordance with the Agreed Settlement, we do not expect the net liabilities share adjustment to be adjusted by any liability arising from the Specified Litigation Matter. For further information regarding the Specified Litigation Matter, see “Transaction Agreements — Reorganization Agreement — Specified Litigation Matter” below.

The number of fully diluted shares of Liberty SiriusXM Common Stock outstanding, which will be calculated as of the Measurement Date, will be calculated based on (a) the issued and outstanding shares of Liberty SiriusXM Common Stock, including restricted shares and restricted stock units of Liberty SiriusXM Common Stock accelerated in accordance with the Reorganization Agreement, net of tax withholding, plus (b) the number of shares of Liberty SiriusXM Common Stock underlying unexercised equity options granted prior to the date of the Reorganization Agreement, plus (c) the amount equal to (i) the aggregate number of shares of LSXMA that would be issuable upon conversion of Liberty Media’s 3.75% Convertible Senior Notes due 2028, plus (ii) the number of shares of LSXMA (if any) equal to the quotient obtained by dividing (A) the amount (if any) by which the aggregate principal amount of Liberty Media’s 3.75% Convertible Senior Notes due 2028 exceeds the value of such LSXMA shares (as determined by the average of the daily VWAP of shares of LSXMA for the ten consecutive trading days ending on the Measurement Date) that would be issuable upon conversion of Liberty Media’s 3.75% Convertible Senior Notes due 2028 by (B) an average of the daily VWAP of shares of LSXMA for the ten consecutive trading days ending on the Measurement Date.

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In accordance with the treasury stock method, the number of adjusted fully diluted shares of Liberty SiriusXM Common Stock used in the calculation of the Exchange Ratio will be reduced by the aggregate value of the exercise prices of certain Liberty SiriusXM option awards, which will be calculated, as of the Measurement Date, by dividing (i) the aggregate exercise price of outstanding stock options relating to Liberty SiriusXM Common Stock granted prior to the date of the Reorganization Agreement (subject to certain adjustments) by (ii) an average of the daily VWAP of shares of LSXMK for the ten consecutive trading days ending on the Measurement Date.

The shares of New Sirius Common Stock issued in the Split-Off will represent all of the outstanding shares of New Sirius Common Stock immediately following the Split-Off (and prior to the completion of the Merger). For more information, see “The Split-Off Proposal — The Split-Off; Exchange Ratio” and “— What will happen to the Exchange Ratio if the trading prices of shares Liberty SiriusXM Common Stock or Sirius XM Common Stock change between now and the measurement date of the Exchange Ratio?” below.

What factors could impact the calculation of the Exchange Ratio?

Liberty Media estimates that the Exchange Ratio in the Redemption will be approximately 0.83 shares of New Sirius Common Stock per one share of Liberty SiriusXM Common Stock. This estimated Exchange Ratio is based on estimated net financial liabilities (excluding Liberty Media’s 3.75% Convertible Senior Notes due 2028, but including Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049 and the Margin Loan) of the Liberty SiriusXM Group as of June 30, 2024 and estimates of transaction fees and expenses, financing fees, litigation-related liabilities and other corporate adjustments. Because the Exchange Ratio is not fixed and may vary, including due to (a) fluctuations in Liberty SiriusXM Group’s net financial liabilities, including its interest expense, transaction fees and expenses, financing fees and litigation-related liabilities, (b) changes to the trading prices of the shares of LSXMA or LSXMK between now and the Measurement Date, (c) any issuance of Liberty SiriusXM Equity Awards (as defined below) after the date of the Reorganization Agreement, (d) any issuance or repurchase by Liberty Media of shares of Liberty SiriusXM Common Stock (it being understood that any such issuances or repurchases require the prior written consent of Sirius XM Holdings under the Merger Agreement) and (e) any cancellation prior to the Measurement Date of Liberty SiriusXM Equity Awards issued prior to the Reorganization Agreement, the number of shares of New Sirius Common Stock to be received by holders of Liberty SiriusXM Common Stock in the Redemption may change from the estimated Exchange Ratio. Changes in the Exchange Ratio will impact the proportion of issued and outstanding New Sirius Common Stock following the completion of the Transactions represented by the shares of New Sirius Common Stock issued to former holders of Liberty SiriusXM Common Stock relative to former holders of Sirius XM Common Stock in the Transactions. The final Exchange Ratio, as determined in accordance with the Reorganization Agreement, will be rounded to the nearest ten-thousandth.

What will happen to the Exchange Ratio if the trading prices of shares Liberty SiriusXM Common Stock or Sirius XM Common Stock change between now and the measurement date of the Exchange Ratio?

The Exchange Ratio will not change based on any changes in the trading prices of shares of LSXMB or Sirius XM Common Stock between now and the Measurement Date. Changes to the trading prices of the shares of LSXMA or LSXMK between now and the Measurement Date will not meaningfully impact the Exchange Ratio. The VWAP of shares of LSXMA and LSXMK for the ten consecutive trading days ending on the Measurement Date will be used to calculate certain components of the number of adjusted fully diluted shares of Liberty SiriusXM Common Stock, which is a portion of the denominator of the Exchange Ratio. The number of shares of LSXMA (if any) equal to the quotient obtained by dividing (a) the amount (if any) by which the aggregate principal amount of Liberty Media’s 3.75% Convertible Senior Notes due 2028 exceeds the value of such LSXMA shares (as determined by the average of the daily VWAP of shares of LSXMA for the ten consecutive trading days ending on the Measurement Date) that would be issuable upon conversion of Liberty Media’s 3.75% Convertible Senior Notes due 2028 by (b) the VWAP of shares of LSXMA for the ten consecutive trading days ending on the Measurement Date will be added to the denominator of the Exchange Ratio.

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Additionally, the number of shares of Liberty SiriusXM Common Stock underlying the then-outstanding equity awards, and reduced by the quotient obtained by dividing (1) the aggregate exercise price of outstanding stock options relating to Liberty SiriusXM Common Stock granted prior to the date of the Reorganization Agreement and outstanding as of the Measurement Date (subject to certain adjustments) by (2) the VWAP of shares of LSXMK for the ten consecutive trading days ending on the Measurement Date, also will be added to the denominator of the Exchange Ratio.

What will the holders of Sirius XM Common Stock receive as a result of the Merger?

At the Merger Effective Time, each share of Sirius XM Common Stock issued and outstanding immediately prior to the Merger Effective Time (other than Treasury Shares and Liberty Owned SiriusXM Shares) will be converted into the right to receive one-tenth (0.1) of a share of New Sirius Common Stock in book-entry form (the SiriusXM Exchange Ratio), with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock. In accordance with the terms of the Merger Agreement, Treasury Shares issued and outstanding immediately prior to the Merger Effective Time will be canceled and no consideration will be delivered in exchange therefor, and each Liberty Owned SiriusXM Share issued and outstanding immediately prior to the Merger Effective Time will be converted into one share of Surviving Corporation Common Stock, which shares will be held of record by New Sirius or certain of its subsidiaries.

What will happen to outstanding Liberty SiriusXM equity awards and Sirius XM Holdings equity awards in connection with the Transactions?

As described in more detail below under “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards,” each option to purchase shares of Liberty SiriusXM Common Stock outstanding as of immediately prior to the Split-Off Effective Time (a Liberty SiriusXM option award) will accelerate and become fully vested immediately prior to, and contingent upon, the Split-Off Effective Time. Each Liberty SiriusXM option award will be converted into an option to purchase shares of New Sirius Common Stock (a New Sirius option award), with appropriate adjustments based on the Exchange Ratio being made to determine the number of shares and applicable exercise price subject to each New Sirius option award after giving effect to the Split-Off. The New Sirius option awards will be subject to the terms and conditions of the Transitional Plan (as defined below) and, except as described above, all other terms of the New Sirius option award will, in all material respects, be the same as those of the corresponding original Liberty SiriusXM option award. As discussed below in “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards — Transitional Plan,” the shares of New Sirius Common Stock underlying New Sirius option awards held by any individual who will serve as a member of the New Sirius board of directors can be registered on a Form S-8 and will be settled in shares upon exercise. Shares of New Sirius Common Stock underlying other New Sirius option awards that may not be able to be registered on a Form S-8 will be settled in cash upon exercise.

Each restricted stock unit with respect to shares of Liberty SiriusXM Common Stock and each restricted share of Liberty SiriusXM Common Stock outstanding as of ten business days prior to the Redemption Date (or such other date on or around that time as may be determined by the board of directors of Liberty Media (or an authorized committee thereof)) will accelerate and become fully vested on such date and, net of taxes, will be treated as outstanding shares of Liberty SiriusXM Common Stock and will be redeemed for shares of New Sirius Common Stock in the Redemption at the Exchange Ratio, with cash (without interest) being paid in lieu of any fractional shares of New Sirius Common Stock.

As described in more detail below under “The Merger — Treatment of Outstanding Equity Awards,” in connection with the Merger, (a) each stock option relating to Sirius XM Common Stock (a SiriusXM option) that is outstanding and unexercised immediately prior to the Merger Effective Time will be converted into a stock option relating to New Sirius Common Stock, with appropriate adjustments based on the SiriusXM Exchange Ratio being made to determine the number of shares and applicable exercise price subject to each New Sirius option award after giving effect to the Merger, and such New Sirius option award will have the same terms (including the vesting requirements) as those of the

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corresponding SiriusXM option immediately prior to the Merger Effective Time, and (b) each restricted stock unit relating to Sirius XM Common Stock (a SiriusXM RSU) that is outstanding immediately prior to the Merger Effective Time will be converted into a restricted stock unit relating to New Sirius Common Stock, with appropriate adjustments based on the SiriusXM Exchange Ratio being made to determine the number of shares subject to each New Sirius restricted stock unit after giving effect to the Merger, with such New Sirius restricted stock unit having the same terms (including the vesting requirements) as those of the corresponding SiriusXM RSU immediately prior to the Merger Effective Time.

What are the U.S. federal income tax consequences of the Split-Off?

It is a nonwaivable condition to the Split-Off that Liberty Media receives the opinion of Skadden, Arps, Slate, Meagher & Flom LLP (Skadden Arps), dated as of the date on which the Redemption will be effective (the Redemption Date) and in form and substance reasonably acceptable to Liberty Media, to the effect that, for U.S. federal income tax purposes, (a) the Redemption, taken together with the Contribution (collectively, the Split-Off Transactions) will qualify as a transaction that is generally tax-free under Section 355, Section 368(a)(1)(D) and related provisions of the Code, (b) no income, gain or loss will be recognized by Liberty Media upon the receipt of New Sirius Common Stock in the Contribution or the distribution of New Sirius Common Stock pursuant to the Split-Off (except as a result of certain items of income, gain, deduction or loss (i) recognized with respect to the deemed exchange, for U.S. federal income tax purposes, of certain New Sirius Liabilities (as defined below) or (ii) that is not excludable by reason of the qualification of the Split-Off Transactions as a reorganization and is taken into account pursuant to the consolidated return regulations), and (c) no gain or loss will be recognized by, and no amount will be included in the income of, holders of Liberty SiriusXM Common Stock upon the receipt of shares of New Sirius Common Stock in the Split-Off (except with respect to the receipt of any cash in lieu of fractional shares) (collectively the Split-Off Intended Tax Treatment).

For a summary of U.S. federal income tax consequences of the Split-Off to holders of Liberty SiriusXM Common Stock, please see the section entitled “U.S. Federal Income Tax Consequences.”

What are the U.S. federal income tax consequences of the Merger?

It is a nonwaivable condition to the Merger that Liberty Media receives the opinion of Skadden Arps, dated as of the effective date of the Merger (the Merger Effective Date) and in form and substance reasonably acceptable to Liberty Media, to the effect that, for U.S. federal income tax purposes, the exchanges of Sirius XM Common Stock for New Sirius Common Stock pursuant to the Merger, taken together with the Contribution, will qualify as exchanges described in Section 351 of the Internal Revenue Code of 1986, as amended (the Code) (the Merger Intended Tax Treatment). In addition, it is a nonwaivable condition to the Merger that Sirius XM Holdings receives the opinion of Simpson Thacher & Bartlett LLP (Simpson Thacher), dated as of the Merger Effective Date and in form and substance reasonably acceptable to Sirius XM Holdings, to the effect that, for U.S. federal income tax purposes, the exchanges of Sirius XM Common Stock for New Sirius Common Stock pursuant to the Merger, taken together with the Contribution, will qualify for the Merger Intended Tax Treatment.

For a summary of U.S. federal income tax consequences of the Merger to holders of Sirius XM Common Stock, please see the section entitled “U.S. Federal Income Tax Consequences.”

What regulatory approvals are required to complete the Transactions?

The Transactions do not require any notifications by Liberty Media, New Sirius or Sirius XM Holdings under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the HSR Act). Certain stockholders of Liberty Media or Sirius XM Holdings, however, are required to provide notifications to the Department of Justice (DOJ) and Federal Trade Commission (FTC) as a result of the Transactions. Any such stockholder notifications are not conditions to closing of the Transactions.

Liberty Media and Sirius XM Holdings submitted applications to the FCC for authorization to transfer control of subsidiaries of Sirius XM Holdings that hold FCC licenses and authorizations and the

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associated FCC licenses and authorizations from Liberty Media to New Sirius and the FCC approved such applications in March 2024. Additionally, the Conversion requires the FCC’s prior approval of the pro forma assignment and transfer of control applications for the FCC licenses and authorizations held by Sirius XM Radio and its licensee subsidiaries, for which Sirius XM Holdings submitted applications to the FCC. The FCC has approved all such assignment and transfer of control applications filed in connection with the Conversion.

Is the completion of the Split-Off subject to any conditions?

Yes. As more fully described in “Transaction Agreements — Reorganization Agreement — Conditions to Completion of the Contribution and the Redemption,” the completion of the Split-Off and related transactions are subject to (a) the satisfaction or, if permissible, waiver of the conditions set forth in the Merger Agreement (other than the conditions that the Split-Off has occurred and that the conditions to the Split-Off have been satisfied or, if permissible, waived), including, among others, the receipt (i) by Liberty Media of approval of the Split-Off Proposal by the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class, and (ii) by Liberty Media and Sirius XM Holdings of the tax opinions described below, (b) the confirmation by the parties to the Merger Agreement that the completion of the Merger will occur subject only to the occurrence of the Split-Off Effective Time, (c) the absence of any law, order or other legal restraint that has the effect of enjoining, restraining, preventing or prohibiting the consummation of the Contribution or Redemption and (d) the completion of the Conversion. The foregoing conditions, other than the condition set forth in clause (c), may not be waived by Liberty Media, New Sirius or Sirius XM Holdings.

Subject to the satisfaction or, if permissible, waiver of the conditions described above, the Split-Off will be completed substantially concurrently with (but prior to) the completion of the Merger, unless the Merger Agreement has been terminated, in which case, the Split-Off will not be completed. For so long as the Merger Agreement is in effect, the Liberty Media board of directors may not terminate the Split-Off without the consent of Sirius XM Holdings (through the Special Committee).

We cannot be certain when, or if, the conditions to the Split-Off will be satisfied or, if permissible, waived, or that the Split-Off will be completed.

Is the completion of the Merger subject to any conditions?

Yes. As more fully described in “Transaction Agreements — Merger Agreement — Conditions to Completion of the Merger,” the completion of the Merger depends on a number of conditions being satisfied or, if permissible, waived.

In addition to the receipt of the Liberty Split-Off Stockholder Approval, which cannot be waived, the satisfaction or, if permissible, waiver of the conditions set forth in the Reorganization Agreement (as described above) and the completion of the Split-Off, the Merger is subject to the satisfaction or, if permissible, waiver of certain conditions, including:

•

the receipt of approval of the Transactions and the Conversion under the Communications Act;

•

the absence of any law, order or other legal restraint that has the effect of enjoining, restraining, preventing or prohibiting the consummation of any of the Transactions;

•

subject to certain exceptions set forth in the Merger Agreement, the receipt of all approvals and authorizations of, and all expirations of waiting periods required by, any governmental authority which are required to complete the Merger or the Split-Off, which must be in full force and effect as of the completion of the Split-Off (the Regulatory Approvals Condition);

•

the effectiveness under the Securities Act of 1933, as amended (the Securities Act), of the registration statement on Form S-4, of which this proxy statement/notice/prospectus/information statement forms a part, with no stop order suspending the effectiveness of the registration statement on Form S-4 or proceeding seeking a stop order having been initiated or threatened by the SEC;

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•

the effectiveness of the registration of the shares of New Sirius Common Stock under Section 12(b) of the Exchange Act; and

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the receipt of approval of Nasdaq for listing of the shares of New Sirius Common Stock, subject to official notice of issuance.

The foregoing conditions to the Transactions, other than the Regulatory Approvals Condition, which (if waived) must be waived by all of the parties to the Merger Agreement, may not be waived by Liberty Media, New Sirius, Merger Sub or Sirius XM Holdings.

The obligations of Sirius XM Holdings to complete the Transactions are also subject to the satisfaction or, if permissible, waiver of the following conditions (among others): (a) receipt of an opinion from Simpson Thacher, as described in more detail in “U.S. Federal Income Tax Consequences — Tax Opinions” and (b) Liberty Media’s, New Sirius’ and Merger Sub’s representations and warranties being true and correct as of the date the Merger is completed (subject to certain materiality and material adverse effect qualifications) and Liberty Media, New Sirius and Merger Sub having performed in all material respects their respective obligations under the Merger Agreement. The foregoing condition to the Transactions set forth in clause (a) above may not be waived by Sirius XM Holdings.

The obligations of Liberty Media, New Sirius and Merger Sub to complete the Transactions are also subject to the satisfaction or, if permissible, waiver of the following conditions (among others): (a) receipt of opinions from Skadden Arps, as described in more detail in “U.S. Federal Income Tax Consequences — Tax Opinions,” (b) Sirius XM Holdings’ representations and warranties being true and correct as of the date the Merger is completed (subject to certain materiality and material adverse effect qualifications) and Sirius XM Holdings having performed in all material respects its obligations under the Merger Agreement and (c) the repayment, or the arrangement for the repayment, of all loans outstanding, including accrued interest and additional amounts due under, the Margin Loan. The foregoing conditions to the Transactions set forth in clauses (a) and (c) above may not be waived by Liberty Media, New Sirius or Merger Sub.

We cannot be certain when, or if, the conditions to the Transactions will be satisfied or, if permissible, waived, or that the Transactions will be completed.

Can the parties solicit alternative transactions or can the Liberty Media board of directors, Sirius XM Holdings board of directors or the Special Committee change its recommendation?

As more fully described in this proxy statement/notice/prospectus/information statement and in the Merger Agreement, during the pendency of the Merger Agreement, each of Liberty Media, New Sirius and Sirius XM Holdings has agreed to non-solicitation obligations with respect to third-party acquisition proposals (including provisions restricting their ability to provide confidential information to third parties) and has agreed to certain restrictions on it and its representatives’ ability to respond to any such proposals.

The Liberty Media board of directors has recommended that you vote “FOR” the Split-Off Proposal and has agreed in the Merger Agreement, among other things, to include this recommendation in this proxy statement/notice/prospectus/information statement. Neither the Liberty Media board of directors nor any committee of Liberty Media’s board of directors is permitted to change this recommendation or otherwise recommend or approve any alternative transaction (such actions referred to as a Liberty Adverse Recommendation Change) unless the Liberty Media board of directors determines, in good faith, after consulting with outside legal counsel that the failure to take such action would result in a violation of its fiduciary duties under applicable law. Even if the Liberty Media board of directors makes a Liberty Adverse Recommendation Change, the Split-Off Proposal is still required to be submitted to the holders of shares of LSXMA and LSXMB at the Liberty Special Meeting for the purposes of approving the Split-Off Proposal unless the Merger Agreement is terminated prior to such time.

The Sirius XM Holdings board of directors, following the recommendation of a special committee comprised solely of independent directors of Sirius XM Holdings who are also independent of Liberty

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Media (such independent directors being Eddy W. Hartenstein and James P. Holden; collectively, the Special Committee), has recommended that the stockholders of Sirius XM Holdings (other than Liberty Media and its subsidiaries) adopt the Merger Agreement and has agreed that neither the Sirius XM Holdings board of directors nor any committee thereof, including the Special Committee, will recommend or approve any alternative transaction.

For a more complete description of the limitations on solicitation of acquisition proposals from third party and the ability of either the Liberty Media board of directors or Sirius XM Holdings board of directors to change its recommendation in favor of the Split-Off Proposal see “Transaction Agreements — Merger Agreement” below.

Can the Reorganization Agreement be terminated by the parties?

Yes. The Reorganization Agreement may be terminated and the Split-Off may be abandoned, at any time prior to the Split-Off Effective Time, (a) by Liberty Media for any reason if the Merger Agreement has been terminated in accordance with its terms or (b) by written agreement of Liberty Media, New Sirius and Sirius XM Holdings (through the Special Committee) if the Merger Agreement has not been terminated in accordance with its terms. If the Split-Off is not completed, then the Merger will not be completed.

Can the Merger Agreement be terminated by the parties?

Yes. Sirius XM Holdings (through the Special Committee) and Liberty Media may jointly agree to terminate the Merger Agreement at any time.

Either Sirius XM Holdings (through the Special Committee) or Liberty Media may terminate the Merger Agreement if:

•

the Transactions are not completed on or before November 15, 2024 (the Walk-Away Date), except a party cannot terminate the Merger Agreement for this reason if that party’s breach of any of the Transaction Agreements (as defined below) is the primary cause of or resulted in the failure to complete the Merger prior to or on the Walk-Away Date;

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a law, order or other legal restraint of any governmental authority enjoins, restrains, prevents or prohibits the consummation of any of the Transactions, except a party cannot terminate the Merger Agreement for this reason if that party’s breach of any of the Transaction Agreements is the primary cause of such law order or restraint; or

•

the Liberty Split-Off Stockholder Approval is not obtained at the Liberty Special Meeting, except Liberty Media cannot terminate the Merger Agreement for this reason if Liberty Media is then in material breach of its obligations under the Merger Agreement related to obtaining the Liberty Split-Off Stockholder Approval or its non-solicitation obligations under the Merger Agreement.

Sirius XM Holdings (through the Special Committee) may terminate the Merger Agreement if:

•

Liberty Media, New Sirius or Merger Sub breaches or fails to perform any of their respective representations, warranties, covenants or agreements set forth in the Merger Agreement or the Reorganization Agreement, which breach or failure to perform would result in the failure of (a) a closing condition regarding the accuracy of its representations and warranties or the performance by it in all material respects of its obligations under the Merger Agreement or (b) the completion of the Split-Off in accordance with the Reorganization Agreement and, in each case, such breach or failure to perform is incapable of being cured by the Walk-Away Date, or is not cured within 30 calendar days following receipt of written notice from the Special Committee (on behalf of Sirius XM Holdings) of such breach or failure to perform, except that Sirius XM Holdings will not have the right to terminate the Merger Agreement for this reason if Sirius XM Holdings is then in breach of any of its representations, warranties or covenants in the Merger Agreement and such breach would result in the failure of a closing condition regarding the accuracy of its representations and warranties or the performance by it in all material respects of its obligations under the Merger Agreement; or

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•

the Liberty Media board of directors makes a Liberty Adverse Recommendation Change.

Liberty Media can terminate the Merger Agreement if Sirius XM Holdings breaches or fails to perform any of its representations, warranties, covenants or agreements set forth in the Merger Agreement or Reorganization Agreement, which breach or failure to perform would result in the failure of (a) a closing condition regarding the accuracy of its representations and warranties or the performance by it in all material respects with its obligations under the Merger Agreement or (b) the completion of the Split-Off in accordance with the Reorganization Agreement and, in each case, such breach or failure to perform is incapable of being cured by the Walk-Away Date, or is not cured within 30 calendar days following receipt of written notice from Liberty Media of such breach or failure to perform, except that Liberty Media will not have the right to terminate the Merger Agreement for this reason if Liberty Media, New Sirius or Merger Sub is then in breach of any of its representations, warranties or covenants under the Merger Agreement and such breach would result in the failure of a closing condition regarding the accuracy of its, New Sirius’ or Merger Sub’s representations and warranties or the performance by New Sirius, Merger Sub or it in all material respects with their respective obligations under the Merger Agreement.

What is the effect of the termination of the Merger Agreement?

In the event the Merger Agreement is terminated, the Merger Agreement will become null and void (other than certain specified provisions as described in the next sentence) and none of Liberty Media, Sirius XM Holdings or New Sirius, or their respective directors, officers and affiliates, will have any liability under the Merger Agreement except that nothing will relieve any party from liability for fraud or any willful breach of the Merger Agreement. Certain designated provisions of the Merger Agreement, including, but not limited to, the payment of fees and expenses and confidentiality restrictions and, under certain circumstances, the payment of the termination fee described below, will survive the termination of the Merger Agreement. If the Merger Agreement is terminated, the Split-Off will not be completed.

Are there any fees payable by the parties in connection with the termination of the Merger Agreement?

The Merger Agreement provides that Liberty Media will be required to pay a termination fee to Sirius XM Holdings of $450 million in cash if Sirius XM Holdings (through the Special Committee) terminates the Merger Agreement as a result of the occurrence of a Liberty Adverse Recommendation Change.

If the Merger Agreement is terminated under circumstances where such termination fee is payable, and is paid, by Liberty Media, subject to certain limited exceptions, including for any willful breach by Liberty Media of its non-solicitation obligations set forth in the Merger Agreement, Sirius XM Holdings and certain related parties will be precluded from any other remedy against Liberty Media and certain related parties in connection with the Merger Agreement or the Transactions.

Are the Transactions subject to a financing condition?

The Transactions are not subject to a financing condition. In connection with the Transactions, (a) all loans outstanding, together with accrued interest and any additional amounts due, under the Margin Loan will be repaid (the Margin Loan Obligation), (b) holders of the 2.75% Exchangeable Senior Debentures due 2049 will have the right to require New Sirius (as issuer by assumption pursuant to the terms of the indenture governing the 2.75% Exchangeable Senior Debentures due 2049) to repurchase the 2.75% Exchangeable Senior Debentures due 2049 (together with the Margin Loan Obligation, the Financed Obligations) at a purchase price equal to the adjusted principal amount plus accrued and unpaid interest and (c) Liberty Media’s 3.75% Convertible Senior Notes due 2028 will be assumed by New Sirius pursuant to the terms of the indenture governing such 3.75% Convertible Senior Notes due 2028. Sirius XM Holdings estimates that the total funds necessary to pay in full the Financed Obligations will be approximately $1.1 billion.

Sirius XM Holdings intends to fund, in the form of a promissory note from Sirius XM Radio to New Sirius, the amounts necessary to pay the Financed Obligations with a combination of cash from Sirius XM Radio and its subsidiaries and, to the extent necessary, debt financing. On January 26, 2024,

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Sirius XM Radio entered into an amendment to its existing credit facility to provide for the addition of a $1.1 billion incremental term loan (the Sirius XM Radio Term Loan A) arranged by BofA Securities, Inc., Morgan Stanley Senior Funding, Inc. and JPMorgan Chase Bank, N.A., which, subject to satisfaction of certain borrowing conditions, may be used to pay the Financed Obligations. Upon the execution of the amendment providing for the Sirius XM Radio Term Loan A, the Debt Commitment Letter (as defined below) related to the Bridge Financing (as defined below) was terminated.

For more information, see “The Merger — Amount and Source of Funds and Financing; Expenses” and “Description of Certain Indebtedness.”

Will fractional shares of New Sirius Common Stock be issued in connection with the Split-Off or the Merger?

No fractional shares of New Sirius Common Stock will be issued in connection with the Split-Off or the Merger. Instead, each holder of record of shares of Liberty SiriusXM Common Stock who would otherwise have received a fraction of a share of New Sirius Common Stock pursuant to the Redemption will receive cash in an amount of such holder’s pro rata share of the net proceeds from a sale by the Redemption Agent (as defined below) in the public market of the aggregate fractional shares of New Sirius Common Stock to be issued in the Redemption to such holders of record. A holder of Liberty SiriusXM Common Stock who holds their shares in street name should reach out to their broker or other nominee with any questions, as only DTC Participants (as defined below) who would otherwise have received a fraction of a share of New Sirius Common Stock pursuant to the Redemption will receive cash in an amount of such DTC Participant’s pro rata share of the net proceeds from a sale by the Redemption Agent in the public market of the aggregate fractional shares of New Sirius Common Stock to be issued in the Redemption to such DTC Participants. Similarly, each holder of record of shares of Sirius XM Common Stock who would otherwise have received a fraction of a share of New Sirius Common Stock pursuant to the Merger will receive cash in an amount of such holder’s pro rata share of the net proceeds from a sale by the Exchange Agent (as defined below) in the public market of the aggregate fractional shares of New Sirius Common Stock to be issued in the Merger to such holders of record. A holder of Sirius XM Common Stock who holds their shares in street name should reach out to their broker or other nominee with any questions, as only DTC Participants who would otherwise have received a fraction of a share of New Sirius Common Stock pursuant to the Merger will receive cash in an amount of such DTC Participant’s pro rata share of the net proceeds from a sale by the Exchange Agent in the public market of the aggregate fractional shares of New Sirius Common Stock to be issued in the Merger to such DTC Participants. As used herein, DTC Participant is defined as brokers and other nominees that are participants in The Depositary Trust Company and hold shares in street name. No interest will be paid on any cash received in lieu of a fractional share. The receipt of cash in lieu of fractional shares will generally be taxable to the recipient stockholders. See “U.S. Federal Income Tax Consequences.”

Following the completion of the Transactions, will Liberty Media and New Sirius be subject to any mutual indemnification obligations?

Yes. The Reorganization Agreement provides for mutual indemnification obligations between Liberty Media and New Sirius, pursuant to which (a) New Sirius indemnifies Liberty Media for all losses and damages incurred by Liberty Media in connection with the liabilities that may exist relating to the businesses, assets and liabilities contributed to New Sirius in the Contribution in accordance with the Reorganization Agreement, together with liabilities resulting from any breach of any covenant by New Sirius in the Reorganization Agreement after the completion of the Split-Off, and (b) Liberty Media indemnifies New Sirius for all losses and damages incurred by New Sirius in connection with the liabilities that may exist relating to the businesses, assets and liabilities retained by Liberty Media following the Contribution in accordance with the Reorganization Agreement, together with liabilities resulting from any breach of any covenant by Liberty Media in the Reorganization Agreement. These indemnification obligations exclude any matters relating to taxes. For a description of the allocation of tax-related obligations, please see “Transaction Agreements — Tax Sharing Agreement” below.

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What is the accounting treatment for the Transactions?

Liberty Media and Sirius XM Holdings prepare their financial statements, respectively, in accordance with accounting principles generally accepted in the U.S. (GAAP). The Split-Off will be accounted for at historical cost due to the fact that New Sirius Common Stock will be distributed pro-rata to holders of Liberty SiriusXM Common Stock. Following the Split-Off, New Sirius will acquire the remaining outstanding Sirius XM Common Stock it does not own through an equity exchange where holders of Sirius XM Common Stock will receive one-tenth (0.1) of a share of New Sirius Common Stock for each share of Sirius XM Common Stock, thereby eliminating the noncontrolling interest in Sirius XM Holdings. For more information, see “The Merger — Accounting Treatment.”

Why am I receiving this proxy statement/notice/prospectus/information statement?

We are delivering this proxy statement/notice/prospectus/information statement to holders of shares of LSXMA and LSXMB because it serves as a proxy statement being used by the board of directors of Liberty Media to solicit proxies of holders of LSXMA and LSXMB in connection with approval of the Split-Off Proposal and related matters. This document contains important information about the proposals being voted on at the Liberty Special Meeting, including the Split-Off Proposal. You should read it carefully and in its entirety. The enclosed materials allow you to have your shares of LSXMA or LSXMB voted by proxy without attending the Liberty Special Meeting. Your vote is important and we encourage you to submit your proxy as soon as possible.

We are also delivering this proxy statement/notice/prospectus/information statement to holders of Sirius XM Common Stock because it serves as an information statement being used by the board of directors of Sirius XM Holdings to provide holders of Sirius XM Common Stock with notice of the Sirius XM Stockholder Written Consents and serves as your notice pursuant to Section 228(e) of the DGCL. This document contains important information about the actions taken in connection with the Sirius XM Stockholder Written Consents. Sirius XM Holdings is not asking you for a proxy and you are requested to not send Sirius XM Holdings a proxy.

Finally, this document also serves as a prospectus that is being delivered to holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock because, in connection with the Split-Off and the Merger, New Sirius will be issuing to holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock, respectively, shares of New Sirius Common Stock.

How can I find more information about Liberty Media and Sirius XM Holdings?

You can find more information about Liberty Media and Sirius XM Holdings from various sources described in “Additional Information — Where You Can Find More Information.”

For Holders of Liberty SiriusXM Common Stock

When and where is the Liberty Special Meeting?

The Liberty Special Meeting will be held at 10:15 a.m., Mountain time, on August 23, 2024. The Liberty Special Meeting will be held via the Internet and will be a completely virtual meeting of the holders of LSXMA and LSXMB. You may attend the meeting, access the list of holders of LSXMA and LSXMB, submit questions and vote your shares electronically during the meeting via the Internet by visiting www.virtualshareholdermeeting.com/LMC2024SM. To enter the Liberty Special Meeting, you will need the 16-digit control number that is printed in the box marked by the arrow on your proxy card. It is recommended that you log in at least 15 minutes before the meeting to ensure that you are logged in when the meeting starts. Online check-in will start shortly before the meeting on August 23, 2024.

What is the record date for the Liberty Special Meeting?

The record date for the Liberty Special Meeting is 5:00 p.m., New York City time, on July 17, 2024.

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What is the purpose of the Liberty Special Meeting?

To consider and vote on the Split-Off Proposal and a proposal (the Adjournment Proposal) to approve the adjournment of the Liberty Special Meeting by Liberty Media from time to time to solicit additional proxies in favor of the Split-Off Proposal, if there are insufficient votes at the time of such adjournment to approve the Split-Off Proposal or if otherwise determined by the chairperson of the meeting to be necessary or appropriate.

How does the Liberty Media board of directors recommend that I vote?

The Liberty Media board of directors recommends that you vote “FOR” the Split-Off Proposal and the Adjournment Proposal.

Do the holders of LSXMA and LSXMB need to adopt the Merger Agreement and approve the Merger in order to complete the Transactions?

No. While the approval of the Split-Off Proposal by the holders representing a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class, is required to complete the Transactions, the adoption of the Merger Agreement and the approval of the Merger by the holders of LSXMA and LSXMB is not required to complete the Transactions and is not being sought by Liberty Media.

Do the directors and executive officers of Liberty Media have any interests that may differ from the interests of other holders of Liberty SiriusXM Common Stock?

When considering the recommendation of the Liberty Media board of directors with respect to the Split-Off Proposal, holders of LSXMA and LSXMB should be aware that certain of Liberty Media’s directors and executive officers may be deemed to have interests in the Transactions that are different from, or in addition to, those of holders of Liberty SiriusXM Common Stock. These interests may present such persons with actual or potential conflicts of interest. The Liberty Media board of directors was aware of these interests during the deliberations of the merits of the Transactions, and in deciding to recommend that you vote for each of the Split-Off Proposal and the Adjournment Proposal.

With respect to Liberty Media’s directors and executive officers, areas where their interests may differ from those of holders of Liberty SiriusXM Common Stock in general relate to the indemnification and insurance protections for their service as directors and executive officers pursuant to the organizational documents of Liberty Media and New Sirius, pursuant to indemnification agreements entered into with Liberty Media and pursuant to Liberty Media’s director and officer liability insurance policies. For any directors or executive officers of Liberty Media that will serve as directors or executive officers of New Sirius following the completion of the Transactions, New Sirius will obtain director and officer liability insurance to cover all directors and executive officers of New Sirius.

Additionally, directors and executive officers of Liberty Media hold stock options and/or restricted stock units with respect to Liberty SiriusXM Common Stock, which, (a) in the case of each stock option outstanding immediately prior to the Split-Off, will become fully vested immediately prior to, and contingent upon, the Split-Off Effective Time and be converted into a New Sirius option award based on the Exchange Ratio and (b) in the case of each restricted stock award and restricted stock unit outstanding as of ten business days prior to the Redemption Date (or such other date on or around that time as may be determined by the board of directors of Liberty Media (or an authorized committee thereof)), will become fully vested and, net of taxes, will be treated as an outstanding share of Liberty SiriusXM Common Stock in the Redemption, in each case, as discussed in more detail below in “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Liberty Media in the Transactions — Equity Awards” and “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards.” As discussed below in “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards — Transitional Plan,” the shares of New Sirius Common Stock underlying New Sirius option awards held by any individual who will serve as a member of the New Sirius board of directors can be registered

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on a Form S-8 and will be settled in shares upon exercise. Shares of New Sirius Common Stock underlying other New Sirius option awards that may not be able to be registered on a Form S-8 will be settled in cash upon exercise.

The Liberty Media board of directors and the Sirius XM Holdings board of directors include two overlapping members: Gregory B. Maffei and Evan D. Malone. Mr. Maffei is a member of the Liberty Media board of directors and the President and Chief Executive Officer of Liberty Media and is also the Chairman of the Sirius XM Holdings board of directors. Mr. Evan Malone is a non-employee member of each of the Liberty Media board of directors and Sirius XM Holdings board of directors. Each of Mr. Maffei and Mr. Evan Malone hold shares of Sirius XM Common Stock, stock options with respect to Sirius XM Common Stock and restricted stock units with respect to Sirius XM Common Stock. Those shares will be converted in the Merger into the right to receive shares of New Sirius Common Stock, and such options and restricted stock units will be treated as discussed in more detail under “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Sirius XM Holdings in the Transactions — Equity Awards” and “The Merger — Treatment of Outstanding Equity Awards.”

Effective as of the completion of the Merger, Mr. Maffei is expected to serve as the Chairman of the New Sirius board of directors.

Additionally, in connection with the Transactions, Liberty Media entered into a letter agreement with its Chief Executive Officer, Mr. Maffei, pursuant to which, subject to the terms thereof, Mr. Maffei will receive a $1 million lump sum cash payment in consideration for Mr. Maffei’s waiver of any right to resign from his employment with Liberty Media for “good reason” (as such term is defined in his employment agreement by and between Liberty Media and himself) as a result of the Transactions.

In addition, Mr. Maffei is required as an individual to make a filing under the HSR Act, and Liberty Media, pursuant to Mr. Maffei’s employment agreement, will reimburse Mr. Maffei for the costs and expense of such filing.

John C. Malone is the Chairman of the Liberty Media board of directors. Mr. Malone may be deemed to beneficially own approximately 48.8% of the aggregate voting power represented by the shares of LSXMA and LSXMB outstanding as of April 30, 2024, of which approximately 48.3% of such aggregate voting power is subject to the Voting Agreement. Under the Voting Agreement, each of Sirius XM Holdings and New Sirius, jointly and severally, has agreed to indemnify each Malone Stockholder for certain losses incurred in connection with or arising out of the Voting Agreement. In addition, Sirius XM Holdings and New Sirius have agreed to pay up to $150,000 in the aggregate of reasonable out-of-pocket costs and expenses incurred by the Malone Stockholders in connection with the preparation, negotiation, execution and delivery of the Voting Agreement. See “Transaction Agreements — Voting Agreement” below. In addition, Mr. Malone holds shares of Sirius XM Common Stock, and those shares will be converted in the Merger into the right to receive shares of New Sirius Common Stock.

Additionally, Mr. Evan Malone is expected to serve as a member of the New Sirius board of directors. Mr. Evan Malone was designated to serve as a director of New Sirius subsequent to the Liberty Media board of directors’ deliberations of the merits of the Transactions.

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Why is Liberty Media proposing the Transactions?

In determining to approve the Transactions, the Liberty Media board of directors believes that the Transactions will benefit Liberty Media and its businesses and result in the creation of stockholder value because, among other things, the aggregate trading value of the New Sirius Common Stock that will be held by former holders of Liberty SiriusXM Common Stock following the completion of the Transactions is expected to exceed the aggregate trading value of the existing Liberty SiriusXM Common Stock. The Liberty Media board of directors determined that the Transactions are advisable and in the best interests of Liberty Media and its stockholders. The Liberty Media board of directors took into account a number of factors (none of which can be guaranteed to occur) when approving the Transactions, including the following:

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Address historical trading discount. Separating New Sirius is expected to meaningfully reduce (or eliminate) the discount to net asset value at which Liberty SiriusXM Common Stock has historically traded by eliminating the complexity and uncertainty associated with Liberty Media’s capital structure and creating a single-asset backed security. While the ABHI Split-Off Transactions and the 2023 Reclassification (each as defined below) were intended, in part, to reduce the historical trading discount applied to Liberty SiriusXM Common Stock, this discount has persisted. The Transactions are expected to effectively address the historical trading discount.

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Attractive equity currency for New Sirius. The Transactions will provide New Sirius with a more attractive, asset-backed equity currency with significant float that will be available to raise capital to fund its financial needs or for future acquisitions and growth opportunities. In addition, in connection with the amendments to the Exchange Ratio and the SiriusXM Exchange Ratio, the Liberty Media board of directors expects that the nominal share price of New Sirius Common Stock immediately after the closing of the Transactions will more closely align with the price of the shares of Liberty SiriusXM Common Stock being redeemed in the Split-Off and expects the nominal price per share of New Sirius Common Stock to increase, which is designed to help improve trading dynamics in the stock and potentially increase its attractiveness to investors.

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Simplified capital and governance structure. The Transactions will eliminate the tracking stock structure and the multiple voting classes of Liberty SiriusXM Common Stock and result in New Sirius being an independent public company, with no majority stockholder and a single class of shares outstanding, thereby improving trading liquidity for New Sirius stockholders, providing New Sirius with access to a broader investor base and expanded opportunities for index inclusion, and providing the New Sirius management team with greater flexibility in pursuing growth and capital allocation strategies.

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Attract and retain qualified personnel. New Sirius’ independent equity currency resulting from the Transactions will enable New Sirius to more effectively tailor employee benefit plans and retention programs and provide improved incentives to its management, employees and future hires.

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Expectation for tax-free transaction. The Liberty Media board of directors’ expectation is that the Transactions will be completed in a manner that is generally tax-free to Liberty Media and its stockholders (except with respect to cash received in lieu of fractional shares).

Did the Liberty Media board of directors consider any potential negative aspects and risks in approving the Transactions?

The Liberty Media board of directors also considered a number of potential negative aspects and risks in approving the Transactions, including the following:

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the risk of being unable to achieve the benefits expected from the Transactions;

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the potential disruption of the businesses of Liberty Media and Sirius XM Holdings, as its management and employees devote time and resources to completing the Split-Off and Merger;

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the substantial costs of effecting the Split-Off and Merger;

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any tax liabilities that could arise from the Split-Off as well as the possibility that the U.S. Internal Revenue Service (the IRS) could successfully assert that the Split-Off is taxable to Liberty Media and/or its stockholders;

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the possibility that, as a result of New Sirius’ potential indemnification obligations to Liberty Media under the Tax Sharing Agreement, New Sirius may determine to forgo certain transactions that might otherwise be advantageous for some period of time following the Split-Off, including share repurchases, stock issuances, certain asset dispositions, and other strategic transactions;

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while the Transactions are expected to be completed, there is no assurance that all conditions to the parties’ obligations to complete the Transactions will be satisfied or waived, and as a result, it is possible that the Transactions might not be completed;

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the interests of Liberty Media’s directors and executive officers and the interests of Sirius XM Holdings’ directors and executive officers in the Transactions described under “The Proposed Transactions — Interests of Certain Persons”;

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that the number of shares of New Sirius Common Stock to be issued in the Split-Off is based on an Exchange Ratio that does not take into account fluctuations in the share prices of Sirius XM Common Stock, and changes in the share price of Liberty SiriusXM Common Stock will not meaningfully impact the Exchange Ratio and, that, as a result, stock price changes may impact the value of the consideration expected to be received by the holders of Liberty SiriusXM Common Stock in the Transactions; and

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that certain provisions of the Merger Agreement that require Liberty Media to pay Sirius XM Holdings a termination fee in certain circumstances could deter a third party from making a competing acquisition proposal for Liberty SiriusXM Common Stock or assets of the Liberty SiriusXM Group.

The Liberty Media board of directors evaluated the costs and benefits of the Transactions as a whole and did not find it necessary to assign relative weights to the specific factors considered. The Liberty Media board of directors concluded, however, that the potential benefits of the Transactions outweighed, in each case, the potential costs of the Transactions, and (a) with respect to the Split-Off, that separating New Sirius from Liberty Media by redeeming each outstanding share of LSXMA, LSXMB and LSXMK for a number of shares of New Sirius Common Stock equal to the Exchange Ratio and (b) with respect to the Merger, the acquisition of Sirius XM Holdings by New Sirius, is generally tax efficient, necessary, appropriate, advisable and in the best interests of Liberty Media and its stockholders.

The Liberty Media board of directors unanimously recommends that the holders of LSXMA and LSXMB vote “FOR” the Split-Off Proposal.

If the Split-Off is implemented, what do I need to do with my existing Liberty SiriusXM shares?

Liberty Media will cause the Redemption Agent to deliver or make available to all holders of certificated shares of Liberty SiriusXM Common Stock a letter of transmittal with which to surrender their certificated shares for the applicable number of shares of New Sirius Common Stock in book-entry form. Holders of certificated shares of Liberty SiriusXM Common Stock must surrender their stock certificates together with a duly executed letter of transmittal (and any other documentation required thereby) in order to receive their shares of New Sirius Common Stock in the Split-Off.

Registration in book-entry form refers to a method of recording stock ownership when no physical share certificates are issued to stockholders, as is the case in the Split-Off. Accounts holding shares of Liberty SiriusXM Common Stock in book-entry form will, at the Split-Off Effective Time, be automatically debited for the applicable series and number of shares to be redeemed as of the Split-Off Effective Time, and promptly thereafter credited with the applicable number of shares of New Sirius Common Stock. Holders of only book-entry shares of Liberty SiriusXM Common Stock will not need to take any action to receive their shares of New Sirius Common Stock in the Split-Off. No letters of

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transmittal will be delivered to holders of shares in book-entry form unless they also hold certificated shares of Liberty SiriusXM Common Stock, in which case such holder must surrender such stock certificates together with a duly executed letter of transmittal (and any other documentation required thereby) in order to receive any shares of New Sirius Common Stock, including any shares of New Sirius Common Stock in respect of any shares of Liberty SiriusXM Common Stock held in book-entry form.

In the Split-Off, only book-entry shares will be delivered and no physical share certificates will be issued to any New Sirius stockholders.

What stockholder vote is required to approve each of the proposals?

The Split-Off Proposal requires the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class. Holders of other classes and series of Liberty Media stock, including LSXMK, are not being asked to vote, and are not entitled to vote, on the Split-Off Proposal because such vote is not required by Liberty Media’s certificate of incorporation, bylaws or the laws of the State of Delaware.

The Adjournment Proposal requires the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class. Holders of other classes and series of Liberty Media stock, including LSXMK, are not being asked to vote, and are not entitled to vote, on the Adjournment Proposal because such vote is not required by Liberty Media’s certificate of incorporation, bylaws or the laws of the State of Delaware.

As of April 30, 2024, Liberty Media’s executive officers and directors (including Mr. Malone and Mr. Maffei) beneficially owned approximately 50.3% of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of that date. Liberty Media has been informed that all of its executive officers and directors intend to vote “FOR” the Split-Off Proposal and the Adjournment Proposal. Certain entities affiliated with Mr. Malone have entered into a Voting Agreement with Liberty Media, New Sirius and Sirius XM Holdings. See “Transaction Agreements — Voting Agreement” for a detailed description of the Voting Agreement. Other than the Voting Agreement, no voting agreement exists that requires any of Liberty Media’s executive officers and/or directors to vote in favor of the Split-Off Proposal and/or the Adjournment Proposal. If all such executive officers and directors vote “FOR” the Split-Off Proposal and the Adjournment Proposal, as intended, then no additional votes will be required to be cast by any other LSXMA or LSXMB stockholder and both of the Split-Off Proposal and the Adjournment Proposal will be approved. However, if all votes are cast as intended for the Split-Off Proposal, as noted above, the Liberty Special Meeting would not need to be adjourned as there would be sufficient votes to approve the Split-Off Proposal.

How many votes do stockholders have?

At the Liberty Special Meeting:

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with respect to each of the Split-Off Proposal and the Adjournment Proposal, each holder of record of LSXMA will be entitled to one vote per share and each holder of record of LSXMB will be entitled to ten votes per share; and

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only shares of LSXMA and LSXMB owned as of the record date are eligible to vote at the Liberty Special Meeting.

On the record date, there were 98,140,175 shares of LSXMA outstanding and 9,755,336 shares of LSXMB outstanding.

Pursuant to the Voting Agreement, the Malone Stockholders agreed to vote their respective shares of LSXMA and LSXMB owned by them, representing approximately 48.3% of the total voting power of

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the issued and outstanding shares of LSXMA and LSXMB as of April 30, 2024, in favor of the Split-Off Proposal and the transactions contemplated thereby, except that the Malone Stockholders will be obligated to vote shares representing approximately 33.37% of the total voting power of the issued and outstanding shares of LSXMA and LSXMB in the aggregate in favor thereof in the event that the Liberty Media board of directors makes a Liberty Adverse Recommendation Change and Sirius XM Holdings elects not to terminate the Merger Agreement. For more information, see “Transaction Agreements — Voting Agreement” below.

Why is Liberty Media seeking approval of the Split-Off Proposal by the holders of shares of LSXMA and LSXMB and does my vote matter?

Under the terms of Liberty Media’s certificate of incorporation, the Liberty Media board of directors may, subject to the requisite approval of the holders of shares of LSXMA and LSXMB voting together as a separate class, redeem all of the outstanding shares of Liberty SiriusXM Common Stock for outstanding shares of New Sirius Common Stock. The approval of the Split-Off Proposal requires the affirmative vote of the holders of a majority of the aggregate voting power of the shares of LSXMA and LSXMB outstanding as of the record date, in each case, entitled to vote and that are present in person or by proxy at the Liberty Special Meeting, voting together as a separate class. Holders of shares of LSXMK are not being asked to vote, and are not entitled to vote, on the Split-Off Proposal because such vote is not required by Liberty Media’s certificate of incorporation, bylaws or the laws of the State of Delaware.

Your vote matters. An abstention with respect to the Split-Off Proposal will have the same effect as a vote “AGAINST” such proposal. If you fail to submit a proxy or to vote via the Internet during the Liberty Special Meeting or you do not provide your broker, bank or other nominee with voting instructions, as applicable, with respect to the Split-Off Proposal, this will have no effect on determining whether the Split-Off Proposal is approved (if a quorum is present). The Liberty Media board of directors unanimously recommends that holders of shares of LSXMA and LSXMB vote “FOR” the Split-Off Proposal.

Why is Liberty Media seeking approval of the Adjournment Proposal?

To ensure that a sufficient number of shares are present and entitled to vote at the Liberty Special Meeting on the Split-Off Proposal, Liberty Media may need to approve the adjournment of the Liberty Special Meeting from time to time to solicit additional proxies in favor of the Split-Off Proposal, if there are insufficient votes at the time of such adjournment to approve the Split-Off Proposal or if otherwise determined by the chairperson of the meeting to be necessary or appropriate. If no adjournment were effected and the Split-Off Proposal does not receive the requisite approval at the Liberty Special Meeting because there were insufficient votes represented at the Liberty Special Meeting, Liberty Media would need to call a new stockholders meeting at which it may again seek approval from the holders of shares of LSXMA and LSXMB of such proposals, which could significantly delay Liberty Media’s ability to implement the Split-Off.

What if the Split-Off Proposal is not approved?

If the Split-Off Proposal is not approved, neither the Split-Off nor the Merger will be completed, which means the existing shares of LSXMA, LSXMB and LSXMK will not be redeemed for shares of New Sirius Common Stock and the shares of Sirius XM Common Stock issued and outstanding immediately prior to the Merger Effective Time will not be converted into the right to receive the Merger Consideration.

Will LSXMA, LSXMB and LSXMK continue to be listed or traded following the Split-Off?

After the Split-Off, shares of LSXMA, LSXMB and LSXMK will be delisted from the Nasdaq Global Select Market and will be deregistered under the Exchange Act.

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What constitutes a quorum?

In order to conduct the business of the Liberty Special Meeting, a quorum must be present. This means that the holders of a majority in aggregate voting power represented by the shares of LSXMA and LSXMB outstanding on the record date and entitled to vote at the Liberty Special Meeting must be represented at the Liberty Special Meeting either in person or by proxy. For purposes of determining a quorum, your shares of LSXMA and LSXMB will be included as represented at the meeting even if you indicate on your proxy that you abstain from voting. Because applicable rules of the New York Stock Exchange and The Nasdaq Stock Market LLC (Nasdaq) do not permit discretionary voting by brokers with respect to any of the proposals to be acted upon at the Liberty Special Meeting, if you hold your shares of LSXMA and LSXMB through banks or brokers, your shares will not count as present and entitled to vote for purposes of determining a quorum, unless you instruct your bank or broker on how to vote your shares. This may make it more difficult to establish a quorum at the Liberty Special Meeting. If a quorum is not present at the Liberty Special Meeting, Liberty Media expects the chairman of the meeting to adjourn the meeting in accordance with the terms of the Amended and Restated Bylaws of Liberty Media (Liberty Media’s bylaws) for the purpose of soliciting additional proxies.

What do I, as a holder of shares of LSXMA or LSXMB, need to do to vote on the proposals?

After carefully reading and considering the information contained in or incorporated by reference into this proxy statement/notice/prospectus/information statement, you should submit your proxy before the Liberty Special Meeting in one of the following ways:

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Via the Internet — visit the website shown on your proxy card to vote via the Internet;

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Telephone voting — use the toll-free number shown on your proxy card; or

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Mail — complete, sign, date and return the enclosed proxy card in the enclosed postage-paid envelope.

If you send the proxy by mail, there may be unexpected delays in mail processing times. You should allow a sufficient number of days to ensure delivery as your proxy must be received by the day immediately prior to the date of the Liberty Special Meeting.

If you are a stockholder of record, you may also vote via the Internet during the Liberty Special Meeting by visiting www.virtualshareholdermeeting.com/LMC2024SM. To enter the Liberty Special Meeting, you will need the 16-digit control number that is printed in the box marked by the arrow on your proxy card. It is recommended that you log in at least 15 minutes before the meeting to ensure that you are logged in when the meeting starts. Online check-in will start shortly before the meeting on August 23, 2024.

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. Your broker, bank or other nominee may have an earlier deadline by which you must provide instructions to it as to how to vote your shares, so you should read carefully the materials provided to you by your broker, bank or other nominee or intermediary.

Liberty Media recommends that you vote by proxy even if you plan to attend the Liberty Special Meeting. You may change your vote at the Liberty Special Meeting. If a proxy is properly executed and submitted by a record holder without indicating any voting instructions, the shares of LSXMA and LSXMB represented by the proxy will be voted “FOR” the approval of each of the proposals.

If shares are held in “street name” by a broker, bank or other nominee, will the broker, bank or other nominee vote those shares for the beneficial owner on the proposals?

If you hold your shares in street name and do not provide voting instructions to your broker, bank or other nominee, your shares will not be voted on any of the proposals. Accordingly, your broker, bank or other nominee will vote your shares held in “street name” on the proposals only if you provide

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instructions on how to vote. If you do not instruct your broker, bank or nominee how to vote your shares, they will have no effect on each of the Split-Off Proposal and the Adjournment Proposal (if a quorum is present). You should follow the directions your broker, bank or other nominee provides to you regarding how to vote your shares of LSXMA and LSXMB or when granting or revoking a proxy.

What if I, as a holder of shares of LSXMA or LSXMB, do not vote on the proposals?

If you do not submit a proxy and you do not vote online at the Liberty Special Meeting, your shares will not be counted as present and entitled to vote for purposes of determining a quorum. Your failure to vote will have no effect on determining whether the Split-Off Proposal and the Adjournment Proposal are approved (if a quorum is present). If you submit a proxy but do not indicate how you want to vote, your proxy will be counted as a vote “FOR” each of the proposals.

What if I, as a holder of shares of LSXMA or LSXMB, respond and indicate that I am abstaining from voting?

If you submit a proxy in which you indicate that you are abstaining from voting, your shares will count as present for purposes of determining a quorum, but your proxy will have the same effect as a vote “AGAINST” each of the proposals.

May stockholders who are entitled to vote change their vote after returning a proxy card or voting by telephone or over the Internet?

Yes. Any stockholder giving a proxy has the power to revoke it at any time before the proxy is voted at the Liberty Special Meeting. If you are a stockholder of record, you may revoke your proxy in any of the following ways:

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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;

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by sending a notice of revocation or a completed proxy card bearing a later date than your original proxy card to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717; or

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by attending and voting at the Liberty Special Meeting.

Any signed proxy revocation or new signed proxy must be received by the day immediately prior to the date of the Liberty Special Meeting. In addition, you may change your vote through the Internet or by telephone (if you originally voted by the corresponding method) not later than 11:59 p.m., New York City time, on August 22, 2024.

Your attendance at the Liberty Special Meeting will not, by itself, revoke a prior vote or proxy from you.

If your shares are held in an account by a broker, bank or other nominee, you may change your vote by submitting new voting instructions to your broker, bank or other nominee. You must contact your broker, bank or other nominee to find out how to do so.

What happens if I sell my shares of LSXMA or LSXMB after the record date but before the Liberty Special Meeting?

The record date for the Liberty Special Meeting (July 17, 2024) is earlier than the date of the Liberty Special Meeting and earlier than the date that the Transactions will be completed. If you sell or otherwise transfer your shares of LSXMA or LSXMB after the record date but before the date of the Liberty Special Meeting, you will retain your right to vote at the Liberty Special Meeting. However, you will not have the right to receive shares of New Sirius in the Split-Off. In order to receive shares of New Sirius in the Split-Off, you must hold your shares through the completion of the Split-Off.

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Are there any risks that I should consider in deciding whether to vote in favor of the Split-Off Proposal?

Yes. You should carefully consider the risk factors set forth in the section entitled “Risk Factors” beginning on page 43. You should also read and carefully consider the risk factors of Liberty Media and Sirius XM Holdings contained in documents that are incorporated by reference into this proxy statement/notice/prospectus/information statement.

Where can I find the voting results of the Liberty Special Meeting?

The preliminary voting results will be announced at the Liberty Special Meeting. In addition, within four business days of the Liberty Special Meeting, Liberty Media intends to file the final voting results with the SEC on a Current Report on Form 8-K.

Who is the transfer agent for Liberty SiriusXM Common Stock?

Broadridge Corporate Issuer Solutions, Inc., 51 Mercedes Way, Edgewood, NY 11717.

What if during the check-in time or during the Liberty Special Meeting I have technical difficulties or trouble accessing the applicable virtual meeting website?

Broadridge Corporate Issuer Solutions, Inc. will have technicians ready to assist you with any individual technical difficulties you may have accessing the virtual meeting website. If you encounter any difficulties accessing the virtual meeting website during the check-in or meeting time for the Liberty Special Meeting, please call the technical support number that will be posted on the virtual meeting website log-in page at www.virtualshareholdermeeting.com/LMC2024SM.

If Liberty Media experiences technical difficulties during the Liberty Special Meeting (e.g., a temporary or prolonged power outage), it will determine whether the Liberty Special Meeting can be promptly reconvened (if the technical difficulty is temporary) or whether the Liberty Special Meeting will need to be reconvened on a later day (if the technical difficulty is more prolonged). In any such situation, Liberty Media will promptly notify stockholders of the decision via www.virtualshareholdermeeting.com/LMC2024SM.

For Holders of Sirius XM Common Stock

Has the Special Committee recommended to the Sirius XM Holdings board of directors that it approve the Merger and the other transactions contemplated by the Merger Agreement?

After careful consideration of various factors, including those described in “The Proposed Transactions —Sirius XM Holdings’ Reasons for the Merger,” the Special Committee has unanimously (a) approved, and declared advisable and in the best interests of Sirius XM Holdings and its stockholders (other than Liberty Media and its subsidiaries), the Merger Agreement, including the Merger, each of the other transaction agreements to which Sirius XM Holdings is a party and the Transactions and (b) recommended that the board of directors of Sirius XM Holdings approve the Merger Agreement, including the Merger, each of the other transaction agreements to which Sirius XM Holdings is a party and the Transactions.

Has the board of directors of Sirius XM Holdings approved the Merger and the other transactions contemplated by the Merger Agreement?

After careful consideration of the recommendation of the Special Committee and various factors including those described in “The Proposed Transactions — Sirius XM Holdings’ Reasons for the Merger,” the board of directors of Sirius XM Holdings unanimously (a) determined that the Merger Agreement and the transactions contemplated thereby, including the Merger, are in the best interests of Sirius XM Holdings and the Sirius XM Holdings stockholders (other than Liberty Media and its subsidiaries) and declared that the Merger Agreement is advisable, (b) approved the execution, delivery and performance by Sirius XM Holdings of the Merger Agreement and the transactions contemplated thereby, including the Merger and (c) recommended that the stockholders of Sirius XM Holdings (other than Liberty Media and its subsidiaries) adopt the Merger Agreement.

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Has Sirius XM Holdings stockholder approval of the Merger and the other transactions contemplated by the Merger Agreement been obtained?

Yes. On December 11, 2023 and June 16, 2024, Liberty Radio, which on such dates owned of record a majority of the issued and outstanding shares of Sirius XM Common Stock and held a majority of the voting power of capital stock of Sirius XM Holdings, delivered the Sirius XM Stockholder Written Consents authorizing, adopting and approving the Merger Agreement and the transactions contemplated thereby, including the Merger. The December 2023 Sirius XM Stockholder Written Consent became effective immediately following the execution and delivery of the Merger Agreement by all parties thereto and the June 2024 Sirius XM Stockholder Written Consent became effective immediately following the execution and delivery of the First Amendment to the Agreement and Plan of Merger by all parties thereto. As a result, no further action by any stockholder of Sirius XM Holdings is required under applicable law or the Merger Agreement (or otherwise) to adopt the Merger Agreement or approve the transactions contemplated thereby, including the Merger.

Additionally, at the recommendation of the board of directors of Sirius XM Radio, pursuant to the December 2023 Sirius XM Stockholder Written Consent, Liberty Radio approved the amendment and restatement of the certificate of incorporation of Sirius XM Radio to (a) reduce its number of authorized shares of common stock, par value $0.001, from 9,000,000,000 to 1,000 and remove the 50,000,000 authorized shares of preferred stock, par value $0.001 (and related references to preferred stock) and (b) remove the provision that provides that any act or transaction by Sirius XM Radio that requires for its adoption the approval of the stockholders of Sirius XM Radio shall, pursuant to Section 251(g)(7)(i) of the DGCL, require, in addition, the approval of the stockholders of Sirius XM Holdings by removing the twelfth article of the existing amended and restated certificate of incorporation of Sirius XM Radio (collectively, the Radio Charter Amendment).

If the Merger is completed, what do I need to do with my existing Sirius XM Holdings shares?

New Sirius will cause the Exchange Agent to deliver or make available to all holders of certificated shares of Sirius XM Common Stock a letter of transmittal with which to surrender their certificated shares for the applicable number of shares of New Sirius Common Stock in book-entry form. Holders of certificated shares of Sirius XM Common Stock must surrender their stock certificates together with a duly executed letter of transmittal (and any other documentation required thereby) in order to receive their shares of New Sirius Common Stock in the Merger.

Registration in book-entry form refers to a method of recording stock ownership when no physical share certificates are issued to stockholders, as is the case in the Merger. Accounts holding shares of Sirius XM Common Stock in book-entry form will, at the Merger Effective Time, be automatically debited for the applicable number of shares of Sirius XM Common Stock to be exchanged as of the Merger Effective Time, and promptly thereafter credited with the applicable number of shares of New Sirius Common Stock. Holders of only book-entry shares of Sirius XM Common Stock will not need to take any action to receive their shares of New Sirius Common Stock in the Merger. No letters of transmittal will be delivered to holders of shares in book-entry form unless they also hold certificated shares of Sirius XM Common Stock, in which case such holder must surrender such stock certificates together with a duly executed letter of transmittal (and any other documentation required thereby) in order to receive any shares of New Sirius Common Stock, including any shares of New Sirius Common Stock in respect of any shares of Sirius XM Common Stock held in book-entry form.

In the Merger, only book-entry shares will be delivered and no physical share certificates will be issued to any New Sirius stockholders.

Why is Sirius XM Holdings proposing the Transactions?

The Special Committee believes that the Transactions should provide benefits to Sirius XM Holdings and the holders of shares of Sirius XM Common Stock (other than Liberty Media, New Sirius and their respective subsidiaries), including:

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improved strategic flexibility of Sirius XM Holdings’ due to the fact that New Sirius will have a single class of “one share, one vote” common stock following the Transactions, and will no longer have a controlling stockholder;

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increased trading liquidity for New Sirius Common Stock and the potential for future eligibility for inclusion in stock market indexes, such as the S&P 500 Index; and

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increased stability for a period following the completion of the Transactions due to the fact that the New Sirius board of directors will (a) consist of nine directors, a majority of whom will be independent under the Nasdaq listing rules, five of whom have been designated by Liberty Media and four of whom have been designated by Sirius XM Holdings, and (b) be classified until the third annual meeting of stockholders of New Sirius held after the Merger Effective Time.

For a discussion of the factors that the Special Committee considered in determining to recommend the approval of the Transactions, please see the section of this proxy statement/notice/prospectus/information statement entitled “The Proposed Transactions — Sirius XM Holdings’ Reasons for the Merger — Recommendation of the Sirius XM Holdings Special Committee” beginning on page 94 of this proxy statement/notice/prospectus/information statement.

Do the directors and executive officers of Sirius XM Holdings have any interests that may differ from the interests of other holders of Sirius XM Common Stock?

Holders of Sirius XM Common Stock should be aware that certain of Sirius XM Holdings’ directors and executive officers may be deemed to have interests in the Transactions that are different from, or in addition to, those of holders of Sirius XM Common Stock. These interests may present such persons with actual or potential conflicts of interest. The Special Committee and the Sirius XM Holdings board of directors were aware of these interests during the deliberations of the merits of the Transactions.

With respect to Sirius XM Holdings’ directors and executive officers, areas where their interests may differ from those of holders of Sirius XM Common Stock in general relate to the indemnification and insurance protections for their service as directors and executive officers pursuant to the organizational documents of Sirius XM Holdings and pursuant to Sirius XM Holdings’ director and officer liability insurance policies. In addition, the directors and officers of Sirius XM Holdings and its subsidiaries will have the right to indemnification and continued coverage under a tail directors’ and officers’ liability insurance policy following the Merger. For any directors or executive officers of Sirius XM Holdings that will serve as directors of New Sirius following the completion of the Transactions, New Sirius will obtain director and officer liability insurance to cover all directors and executive officers of New Sirius.

Additionally, any equity awards held by directors and executive officers of Sirius XM Holdings will be converted in connection with the Merger into equity awards of New Sirius based on the SiriusXM Exchange Ratio relating to shares of New Sirius Common Stock and will be subject to the same terms and conditions as in the original Sirius XM equity award as discussed in more detail under “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Sirius XM Holdings in the Transactions — Equity Awards” and “The Merger — Treatment of Outstanding Equity Awards.”

All of the executive officers of Sirius XM Holdings immediately prior to the Merger Effective Time are expected to be the executive officers of New Sirius following the Transactions and are expected to continue to provide services in such capacity following the Transactions. Certain of the directors of Sirius XM Holdings immediately prior to the Merger Effective Time are expected to be directors of New Sirius following the Merger.

The Sirius XM Holdings board of directors and Liberty Media board of directors include two overlapping members: Mr. Maffei and Mr. Evan Malone. Mr. Maffei is a member of the Liberty Media board of directors and the President and Chief Executive Officer of Liberty Media and is also the Chairman of the Sirius XM Holdings board of directors. Mr. Evan Malone is a non-employee member of each of the Liberty Media board of directors and Sirius XM Holdings board of directors. In addition, Robin P. Hickenlooper, a non-employee director of Sirius XM Holdings, also serves Liberty Media as Senior Vice President, Corporate Development, and David A. Blau, a non-employee director of Sirius XM Holdings, served Liberty Media as Executive Vice President, Corporate Development, until December 31, 2023 and then as a Senior Advisor until June 28, 2024. As of April 30, 2024, each of Mr. Maffei, Mr. Evan Malone, Mr. Blau and Ms. Hickenlooper hold shares of Liberty

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SiriusXM Common Stock, stock options with respect to Liberty SiriusXM Common Stock and, except for Mr. Blau, restricted stock units with respect to Liberty SiriusXM Common Stock. Those shares will be redeemed in the Split-Off for shares of New Sirius Common Stock, and such options and restricted stock units will be treated as discussed below under “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Liberty Media in the Transactions — Equity Awards.”

Effective as of the completion of the Merger, (a) Mr. Maffei is expected to serve as the Chairman of the New Sirius board of directors and (b) Jennifer C. Witz, a member of the Sirius XM Holdings board of directors and the Chief Executive Officer of Sirius XM Holdings, is expected to serve as a member of the New Sirius board of directors and as the Chief Executive Officer of New Sirius. Additionally, Eddy Hartenstein, Mr. Evan Malone, James Meyer, Jonelle Procope, Michael Rapino, Kristina Salen and David Zaslav are currently directors of Sirius XM Holdings and are expected to serve as directors of New Sirius following the completion of the Transactions (each of whom was designated to serve as a director of New Sirius subsequent to the Special Committee’s and the Sirius XM Holdings board of directors’ deliberations of the merits of the Transactions).

Based solely on outstanding stock information for LSXMA, LSXMB and LSXMK and Sirius XM Common Stock as of April 30, 2024, and assuming exercise of options and other rights to acquire securities held by such persons and exercisable within 60 days after such date, the people who are expected to serve as the officers and directors of New Sirius and their affiliates following the Transactions (a) beneficially own an aggregate of approximately 1.5% of the outstanding shares of LSXMA and LSXMB entitled to vote on the Split-Off Proposal and the Adjournment Proposal as of April 30, 2024 and (b) are expected to beneficially own shares of New Sirius Common Stock representing approximately 3.4% of the voting power in the aggregate upon the Merger Effective Time, based upon pro forma outstanding stock information for New Sirius Common Stock as of April 30, 2024 and assuming the exercise or conversion of options, warrants or convertible securities or the vesting of restricted stock units that were exercisable, convertible or would vest on or within 60 days after April 30, 2024.

For a detailed discussion of these and other interests, see “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Sirius XM Holdings in the Transactions” below.

What was the role of the Special Committee?

The Sirius XM Holdings board of directors established the Special Committee and adopted resolutions stating that:

•

the Special Committee shall have the power and authority of the Sirius XM Holdings board of directors:

•

to formulate, authorize, approve, modify and terminate Sirius XM Holdings’ policy with respect to the return of capital to its stockholders, including any use of capital for repurchase of shares of the Sirius XM Common Stock; and

•

with respect to any transaction or arrangement between Sirius XM Holdings and Liberty Media; and

•

the Sirius XM Holdings board of directors would not authorize or approve any action with respect to the forgoing matters without the prior affirmative recommendation of the Special Committee.

The Special Committee is comprised of two independent directors who were determined by the Sirius XM Holdings board of directors to be independent of Liberty Media. As more fully described in the section entitled “The Proposed Transactions — Background of the Transactions,” the Special Committee evaluated the transaction agreements and the transactions contemplated by the transaction agreements, including the Transactions, with the assistance of its financial and legal advisors.

At the conclusion of its review, the Special Committee, among other things, unanimously: (a) determined that the transaction agreements and the transactions contemplated by the transaction agreements,

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including the Transactions, are advisable, fair to and in the best interests of Sirius XM Holdings and its stockholders, other than Liberty Media and its subsidiaries, and (b) recommended that the Sirius XM Holdings board of directors approve, the Merger Agreement, each of the other transaction agreements to which Sirius XM Holdings is a party, and the transactions contemplated thereunder.

What does the opinion of Solomon Partners Securities LLC provide?

In connection with the Transactions, the Special Committee received a written opinion, dated December 11, 2023, from its independent financial advisor, Solomon Partners Securities, LLC (Solomon Partners), that, as of such date, and based upon and subject to the factors, limitations, qualifications and assumptions set forth therein, the SiriusXM Exchange Ratio was fair, from a financial point of view, to the holders of Sirius XM Common Stock (other than Liberty Media or its subsidiaries), as more fully described below in the section entitled “The Proposed Transactions — Opinion of Financial Advisor to the Special Committee” beginning on page 98 of this proxy statement/notice/prospectus/information statement. Solomon Partners provided its opinion for the information and assistance of the Special Committee (in its capacity as such) in connection with its consideration of the Transactions.

The foregoing description of Solomon Partners’ opinion is qualified in its entirety by reference to the full text of Solomon Partners’ written opinion, dated December 11, 2023, which sets forth the assumptions made, procedures followed, matters considered and limitations on the review undertaken in connection with the opinion and is attached as Annex G to this proxy statement/notice/prospectus/information statement. Solomon Partners’ opinion does not constitute a recommendation to the Special Committee, the board of directors of Sirius XM Holdings, the holders of Sirius XM Common Stock or any other person as to how such person should vote or act with respect to the Transactions, any matter related thereto or any other matter.

Who is the transfer agent for Sirius XM Common Stock?

Computershare Inc., 150 Royall Street, Suite 101, Canton, MA 02021.

Will Sirius XM Common Stock continue to be listed or traded following the Transactions?

If the Transactions are consummated, New Sirius will be the successor issuer of Sirius XM Holdings. New Sirius Common Stock will be substituted for Sirius XM Common Stock on the Nasdaq Global Select Market and will continue to be traded under the symbol “SIRI” in place of the shares of Sirius XM Common Stock.

For Both Holders of Sirius XM Common Stock and Holders of Liberty SiriusXM Common Stock

What will the relationship be between New Sirius and Liberty Media after the Transactions?

Following the Transactions, Liberty Media and New Sirius will operate independently, and neither will have any ownership interest in the other. In connection with the Split-Off, New Sirius and Liberty Media will enter into the Tax Sharing Agreement which will, among other things, govern Liberty Media’s and New Sirius’ respective rights, responsibilities and obligations with respect to certain taxes and tax benefits, the filing of tax returns, the control of tax audits and other tax matters. The terms of the Tax Sharing Agreement are further summarized in the section “Transaction Agreements — Tax Sharing Agreement” below.

Where will the New Sirius Common Stock trade?

If the Transactions are consummated, the New Sirius Common Stock is expected to be listed on the Nasdaq Global Select Market under Sirius XM Holdings’ current symbol, “SIRI.”

Will New Sirius have more than one series of common stock outstanding and what are the voting rights of the New Sirius Common Stock?

New Sirius will only have one series of common stock outstanding upon the completion of the

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Transactions. Each holder of New Sirius Common Stock will be entitled to one vote for each share of New Sirius Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote. Except as otherwise required by law or as otherwise provided in the Amended and Restated Certificate of Incorporation of New Sirius (New Sirius’ amended and restated charter) (including any certificate of designation relating to a series of preferred stock), the holders of the shares of New Sirius Common Stock shall exclusively possess all voting power. New Sirius’ amended and restated charter does not provide for cumulative voting in the election of directors.

How will the members of the board of directors of New Sirius be determined following the Transactions?

At the Merger Effective Time, the board of directors of New Sirius will consist of a total of nine directors and be classified and divided into three classes, designated Class I, Class II and Class III, with each class initially consisting of three directors. Liberty Media has designated five individuals (the Liberty Media Designees), including Mr. Maffei and four other directors (with three of such four director designees satisfying certain independence requirements). Sirius XM Holdings has designated four individuals (the Sirius XM Holdings Designees), including Ms. Witz and three other directors (with these three director designees satisfying certain independence requirements). For more information, see “The Merger — New Sirius’ Board of Directors and Management after the Merger”, “Transaction Agreements — Merger Agreement — Directors and Officers of New Sirius after Completion of the Merger” and “Management of New Sirius Following the Merger.”

Have Liberty Media and Sirius XM Holdings identified their respective designees to the board of directors of New Sirius following the Transactions?

Liberty Media has designated the following five individuals as the Liberty Media Designees: Mr. Maffei, Mr. Evan Malone, Mr. Meyer, Mr. Zaslav and Mr. Rapino. Sirius XM Holdings has designated the following four individuals as the Sirius XM Holdings Designees: Ms. Witz, Mr. Hartenstein, Ms. Procope and Ms. Salen. For more information, see “The Merger — New Sirius’ Board of Directors and Management after the Merger”, “Transaction Agreements — Merger Agreement — Directors and Officers of New Sirius after Completion of the Merger” and “Management of New Sirius Following the Merger.”

How will the Liberty Media Designees and the Sirius XM Holdings Designees be allocated among the classes of directors following the Transactions?

In connection with the appointments of the Liberty Media Designees and Sirius XM Holdings Designees discussed above, (a) three of the Sirius XM Holdings Designees have been designated as the initial Class I directors for a term expiring at the first annual meeting of stockholders of New Sirius held after the Merger Effective Time, (b) the remaining Sirius XM Holdings Designee and two Liberty Media Designees have been designated as the initial Class II directors for a term expiring at the second annual meeting of stockholders of New Sirius held after the Merger Effective Time, and (c) Mr. Maffei and the two remaining Liberty Media designees (who meet certain independence requirements) have been designated as the initial Class III directors for a term expiring at the third annual meeting of stockholders of New Sirius held after the Merger Effective Time. Pursuant to New Sirius’ amended and restated charter, the board of directors of New Sirius is authorized to assign members of the board of directors already in office to their respective class.

At each annual meeting of stockholders held after the Merger Effective Time, successors to the class of directors whose term expires at that annual meeting will be elected for a term expiring at the next succeeding annual meeting of stockholders. Following the third annual meeting held after the Merger Effective Time, the New Sirius board of directors will cease to be classified.

For more information, see “The Merger — New Sirius’ Board of Directors and Management after the Merger”, “Transaction Agreements — Merger Agreement — Directors and Officers of New Sirius after Completion of the Merger” and “Management of New Sirius Following the Merger.”

How are the Liberty Media Designees and the Sirius XM Holdings Designees allocated among the classes of directors following the Transactions?

Sirius XM Holdings has designated Mr. Hartenstein, Ms. Salen and Ms. Witz as the initial Class I

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directors for a term expiring at the first annual meeting of stockholders of New Sirius held after the Merger Effective Time. Sirius XM Holdings has designated Ms. Procope and Liberty Media has designated Mr. Evan Malone and Mr. Meyer as the initial Class II directors for a term expiring at the second annual meeting of stockholders of New Sirius held after the Merger Effective Time. Liberty Media has designated Mr. Maffei, Mr. Zaslav and Mr. Rapino as the initial Class III directors for a term expiring at the third annual meeting of stockholders of New Sirius held after the Merger Effective Time. For more information, see “The Merger — New Sirius’ Board of Directors and Management after the Merger”, “Transaction Agreements — Merger Agreement — Directors and Officers of New Sirius after Completion of the Merger” and “Management of New Sirius Following the Merger.”

How is a Liberty Media Designee or Sirius XM Holdings Designee determined to be an “independent” member of the board of directors of New Sirius?

For a director to be deemed independent under the Nasdaq listing rules, New Sirius’ board of directors must affirmatively determine that the director has no direct or indirect material relationship with New Sirius. To assist New Sirius’ board of directors in determining which of its directors will qualify as independent, the nominating, environmental, social and governance committee of New Sirius’ board is expected to follow the Corporate Governance Rules of Nasdaq on the criteria for director independence.

Under the terms of the Merger Agreement:

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at least two of the Liberty Media Designees must be individuals who would qualify as an “independent” director under the Nasdaq listing rules with respect to each of New Sirius (after the Merger Effective Time) and Liberty Media;

•

at least one of the Liberty Media Designees (in addition to the two Liberty Media Designees referred to in the preceding bullet point) must be an individual who would qualify as an “independent” director under the Nasdaq listing rules with respect to New Sirius (after the Merger Effective Time); and

•

all of the Sirius XM Holdings Designees (other than Ms. Witz) must, among other things, be individuals who would qualify as “independent” directors under the Nasdaq listing rules with respect to New Sirius (after the Merger Effective Time).

In accordance with these criteria, it is expected that the New Sirius board of directors will determine that each of Mr. Hartenstein, Ms. Procope, Mr. Rapino, Ms. Salen and Mr. Zaslav qualifies as an independent director of New Sirius. For more information, see “Management of New Sirius Following the Merger — Director Independence.”

Who is expected to serve as the executive officers of New Sirius immediately following the Transactions?

The executive officers of New Sirius from and after the completion of the Merger will be the same persons who are the executive officers of Sirius XM Holdings immediately prior to the Merger.

Will New Sirius be considered a “controlled company” under applicable exchange listing standards?

Following the Transactions, New Sirius will not be deemed a “controlled company” under applicable exchange listing standards.

Who is the redemption agent for the consideration issuable in the Split-Off, the exchange agent for the Merger Consideration and the transfer agent for New Sirius Common Stock?

Liberty Media and Sirius XM Holdings have mutually selected Computershare Inc. to serve as redemption agent (the Redemption Agent), exchange agent (the Exchange Agent) and transfer agent (the Transfer Agent) for the purposes of redeeming shares of Liberty SiriusXM Common Stock for shares of New Sirius Common Stock in the Split-Off, for the purposes of exchanging shares of Sirius XM Common Stock for the Merger Consideration and for the shares of New Sirius Common Stock from and after the Merger Effective Time, respectively.

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What equity stake will holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock hold in New Sirius after the Transactions?

Upon completion of the Transactions, based on an estimated Exchange Ratio of approximately 0.83, which takes into account the amendment to the Exchange Ratio providing that it is multiplied by one-tenth (0.1) and which assumes that as of June 30, 2024, there will be approximately 3,846.6 million shares of Sirius XM Common Stock outstanding, approximately 353.1 million shares of Liberty SiriusXM Common Stock outstanding and approximately 3,205.8 million shares of Sirius XM Common Stock held by Liberty Media and its subsidiaries immediately prior to the Split-Off that, pursuant to the Exchange Ratio, is subject to reduction for an estimated net liabilities share adjustment of an amount of New Sirius Common Stock corresponding to approximately 274.8 million shares of Sirius XM Common Stock (which, based on the $4.23 Reference Price (as defined below) for shares of Sirius XM Common Stock, equates to approximately $1,163 million), former holders of Liberty SiriusXM Common Stock (in the aggregate) are expected to own New Sirius Common Stock representing approximately 81% of outstanding shares and former holders of Sirius XM Common Stock (in the aggregate, but other than Liberty Media and its subsidiaries) are expected to own New Sirius Common Stock representing approximately 19% of outstanding shares, in each case, immediately following the completion of the Merger. All of the foregoing percentages are approximations based on share information and net liabilities estimated as of such date and subject to change.

When do Liberty Media and Sirius XM Holdings expect to complete the Transactions?

Liberty Media and Sirius XM Holdings are working to complete the Transactions as soon as practicable. We expect to complete the Transactions in the third quarter of 2024. Neither Liberty Media nor Sirius XM Holdings can predict, however, the actual date on which the Transactions will be completed because they are subject to conditions beyond each company’s control.

Am I entitled to appraisal rights in connection with the Transactions?

Under the DGCL, neither holders of Liberty SiriusXM Common Stock nor holders of Sirius XM Common Stock will be entitled to exercise appraisal rights in connection with the Split-Off or the Merger.

Will the rights of holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock change as a result of the Transactions?

The holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock will have different rights than they do now once they become stockholders of New Sirius due to differences between the governing documents of Liberty Media, Sirius XM Holdings and New Sirius. These differences are described in detail under “Description of New Sirius Capital Stock and Comparison of Stockholder Rights — Comparison of Stockholder Rights.”

What do I do if I have additional questions?

Holders of LSXMA and LSXMB: If you have any questions prior to the Liberty Special Meeting or if you would like copies of any document referred to or incorporated by reference in this proxy statement/notice/prospectus/information statement, please call Liberty Media’s Investor Relations at (877) 772-1518 or Liberty Media’s proxy solicitor, D.F. King & Co., Inc. at (212) 269-5550 (brokers and banks only) or (888) 628-9011 (toll free) or LSXM@dfking.com.

Holders of Sirius XM Common Stock: If you have any questions or if you would like copies of any document referred to or incorporated by reference in this proxy statement/notice/prospectus/information statement, please call Sirius XM Holdings’ Investor Relations at (212) 584-5100 or email Investor.Relations@siriusxm.com.

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SUMMARY

This summary highlights information contained elsewhere in this proxy statement/notice/prospectus/information statement. This summary does not contain all of the important information that you should consider before voting on the proposals. You should read carefully the entire proxy statement/notice/prospectus/information statement, including the Annexes and the documents incorporated by reference herein. In addition, the information set forth under the caption “Questions and Answers” above is deemed part of, and hereby incorporated into, this summary by reference thereto.

The Companies

Liberty Media. Liberty Media owns interests in subsidiaries and other companies that are engaged in the media and entertainment industries primarily in North America and the United Kingdom. Its principal businesses and assets include its consolidated subsidiaries Sirius XM Holdings and Formula 1 and its equity affiliate, Live Nation Entertainment, Inc. (Live Nation).

Liberty Media’s common stock is comprised of three tracking stocks. A tracking stock is a type of common stock that the issuing company intends to reflect or “track” the economic performance of a particular business or “group,” rather than the economic performance of the company as a whole.

While the Liberty SiriusXM Group, the Formula One Group and the Liberty Live Group have separate collections of businesses, assets and liabilities attributed to them, no group is a separate legal entity and therefore cannot own assets, issue securities or enter into legally binding agreements. Holders of tracking stock have no direct claim to the group’s stock or assets and therefore, do not own, by virtue of their ownership of a Liberty Media tracking stock, any equity or voting interest in a public company, such as Sirius XM Holdings, in which Liberty Media holds an interest that is attributed to a Liberty Media tracking stock group, the Liberty SiriusXM Group. Holders of tracking stock are also not represented by separate boards of directors. Instead, holders of tracking stock are stockholders of the parent corporation, with a single board of directors and subject to all of the risks and liabilities of the parent corporation.

As of March 31, 2024, the Liberty SiriusXM Group was primarily comprised of Liberty Media’s interest in Sirius XM Holdings, corporate cash, Liberty Media’s 3.75% Convertible Senior Notes due 2028, Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049 and a margin loan obligation incurred by a wholly owned special purpose subsidiary of Liberty Media. As of March 31, 2024, the Liberty SiriusXM Group had cash and cash equivalents of approximately $135 million, which included approximately $71 million of subsidiary cash.

Liberty Media is a Delaware corporation that was incorporated on August 10, 2012. Liberty Media’s principal executive offices are located at 12300 Liberty Blvd., Englewood, Colorado 80112 and its main telephone number is (720) 875-5400.

New Sirius. New Sirius is currently a wholly owned subsidiary of Liberty Media. Upon completion of the Split-Off, New Sirius will be an independent company and Liberty Media will not retain any ownership interest in New Sirius. Upon the completion of the Split-Off, New Sirius’ principal assets will consist of the businesses and assets attributed to the Liberty SiriusXM Group as of immediately prior to the Contribution, which will include its approximately 83% interest in Sirius XM Holdings and corporate cash (collectively, the New Sirius Assets) and the liabilities attributed to the Liberty SiriusXM Group as of immediately prior to the Contribution and the liabilities of Liberty Media and its subsidiaries arising out of, related to or in connection with the New Sirius business (whether incurred before, on or after the completion of the Transactions), which will include all claims asserted in the lawsuit filed in the Court of Chancery of the State of Delaware, captioned Fishel, et al., v. Liberty Media, et al., Case No. 2021-0820-KSJM (the Specified Litigation Matter), which have since been dismissed with prejudice pursuant to the Order and Final Judgment and subject to the terms of the Agreed Settlement, any action or claim in connection with the Transactions, Liberty Media’s 3.75% Convertible Senior Notes due 2028, Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049, a margin loan obligation incurred by a wholly owned special purpose subsidiary of Liberty Media and certain other liabilities attributed to the Liberty SiriusXM Group as described herein (collectively, the New Sirius Liabilities, and together with the New Sirius Assets, the New Sirius Assets and Liabilities). A more complete description of the businesses and assets that will be held

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by New Sirius can be found in “Description of Business of New Sirius” in this proxy statement/notice/prospectus/information statement. In connection with the Split-Off, New Sirius will enter into certain agreements, including a tax sharing agreement with Liberty Media (the Tax Sharing Agreement), which will, among other things, govern Liberty Media’s and New Sirius’ respective rights, responsibilities and obligations with respect to certain taxes and tax benefits, the filing of tax returns, the control of tax audits and other tax matters. See “Certain Relationships and Related Party Transactions — Relationships Between New Sirius and Liberty Media Following the Transactions.”

Following the Merger, Sirius XM Holdings will be a wholly owned subsidiary of New Sirius. New Sirius will, in connection with the completion of the Merger, be renamed “Sirius XM Holdings Inc.” and will operate under Sirius XM Holdings’ name and brand.

New Sirius is a Delaware corporation that was incorporated on December 4, 2023. Prior to the Merger, New Sirius’ principal executive offices are located at 12300 Liberty Blvd., Englewood, Colorado 80112, and following the Merger, New Sirius’ principal executive offices will be located at 1221 Avenue of the Americas, 35th Floor, New York, New York 10020. Prior to the Transactions, New Sirius’ main telephone number will be that of Liberty Media listed below and following the Transactions, New Sirius’ main telephone number will be (212) 584-5100.

Merger Sub. Merger Sub is a newly formed wholly owned subsidiary of New Sirius. In the Merger, Merger Sub will merge with and into Sirius XM Holdings, with Sirius XM Holdings surviving the Merger as a wholly owned subsidiary of New Sirius.

Sirius XM Holdings.

Sirius XM Holdings operates two complementary audio entertainment businesses — referred to as the “Sirius XM” business and “Pandora and Off-platform” business.

The Sirius XM business features music, sports, entertainment, comedy, talk, news, traffic and weather channels and other content, as well as podcasts and infotainment services, in the U.S. on a subscription fee basis. Sirius XM packages include live, curated and certain exclusive and on demand programming. The Sirius XM service is distributed through two proprietary satellite radio systems and streamed via applications for mobile devices, home devices and other consumer electronic equipment. Satellite radios are primarily distributed through automakers, retailers and Sirius XM Holdings’ website. The Sirius XM service is also available through its in-car user interface, called “360L”, that combines satellite and streaming services into a single, cohesive in-vehicle entertainment experience. The primary source of revenue from the Sirius XM business is subscription fees, with most of its customers subscribing to monthly, quarterly, semi-annual or annual plans. Sirius XM also derives revenue from advertising on select non-music channels, which is sold under the SiriusXM Media brand, direct sales of its satellite radios and accessories, and other ancillary services. As of March 31, 2024, the Sirius XM business had approximately 33.4 million subscribers.

In addition to its audio entertainment businesses, Sirius XM provides connected vehicle services to several automakers. These services are designed to enhance the safety, security and driving experience of consumers. Sirius XM also offers a suite of data services that includes graphical weather, fuel prices, a traffic information service, and real-time weather services in boats and airplanes. Sirius XM also holds a 70% equity interest and 33% voting interest in Sirius XM Canada Holdings Inc. (Sirius XM Canada).

The Pandora and Off-platform business operates a music, comedy and podcast streaming discovery platform, offering a personalized experience for each listener wherever and whenever they want to listen, whether through mobile devices, vehicle speakers or connected devices. Pandora enables listeners to create personalized stations and playlists, discover new content, hear artist- and expert-curated playlists and podcasts as well as search and play songs and albums on-demand. Pandora is available as (1) an ad-supported radio service, (2) a radio subscription service (Pandora Plus) and (3) an on-demand subscription service (Pandora Premium). As of March 31, 2024, Pandora had approximately 5.9 million subscribers. The majority of revenue from Pandora is generated from advertising on the Pandora ad-supported radio service which is sold under the SiriusXM Media brand. Pandora also derives subscription revenue from Pandora Plus and Pandora Premium subscribers.

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Sirius XM Holdings also sells advertising on other audio platforms and in widely distributed podcasts, which it considers to be off-platform services. It has an arrangement with SoundCloud Holdings, LLC (SoundCloud) to be its exclusive ad sales representative in the U.S. and certain European countries and offers advertisers the ability to execute campaigns across the Pandora and SoundCloud platforms. It also has arrangements to serve as the ad sales representative for certain podcasts. In addition, through AdsWizz Inc. (AdsWizz), Sirius XM Holdings provides a comprehensive digital audio and programmatic advertising technology platform, which connects audio publishers and advertisers with a variety of ad insertion, campaign trafficking, yield optimization, programmatic buying, marketplace and monetization solutions.

Sirius XM Holdings’ principal executive offices are located at 1221 Avenue of the Americas, 35th Floor, New York, New York 10020 and its main telephone number is (212) 584-5100.

Summary Risk Factors

In evaluating the proposals set forth in this proxy statement/notice/prospectus/information statement, you should carefully read this proxy statement/notice/prospectus/information statement, including the annexes, and especially consider the discussion of material risks discussed in this section. This summary of material risks related to the Split-Off and Merger should be read in conjunction with the section titled “Risk Factors” starting on page 43 and should not be relied upon as an exhaustive summary of the material risks in connection with the Transactions and an investment in New Sirius and New Sirius’ ownership of Sirius XM Holdings following the Split-Off.

Factors Relating to the Transactions:

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The Exchange Ratio is a calculation that is subject to a number of factors that will not be known until just before the closing.

•

The market value of the shares of New Sirius Common Stock at the time they are initially issued to holders of Liberty SiriusXM Common Stock and Sirius XM Common Stock may vary significantly from (i) the market value of shares of Sirius XM Common Stock on the date of the Reorganization Agreement and the Merger Agreement and/or the date of the First Amendments, (ii) the value of Sirius XM Common Stock implied by the SiriusXM Exchange Ratio, or (iii) the value of Liberty SiriusXM Common Stock implied by the Exchange Ratio.

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The shares of New Sirius Common Stock to be received by holders of Liberty SiriusXM Common Stock upon the completion of the Split-Off and the Merger will have different rights from shares of Liberty SiriusXM Common Stock.

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The shares of New Sirius Common Stock to be received by Sirius XM Holdings stockholders upon the completion of the Merger will have different rights from shares of Sirius XM Common Stock.

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The Split-Off Transactions could result in significant tax liability.

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New Sirius may have a significant indemnity obligation to Liberty Media, which is not limited in amount or subject to any cap, if the Split-Off Transactions are treated as a taxable transaction.

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New Sirius may determine to forgo certain transactions that might otherwise be advantageous in order to avoid the risk of incurring significant tax-related liabilities.

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Liberty Media, Sirius XM Holdings and New Sirius will incur direct and indirect costs and expenses as a result of the Transactions.

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The announcement and pendency of the Transactions could divert the attention of management and cause disruptions in the businesses of Sirius XM Holdings and Liberty Media, which could have an adverse effect on the business and financial results of both Sirius XM Holdings and Liberty Media.

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Liberty Media (with respect to the Liberty SiriusXM Group) and New Sirius are subject to contractual restrictions while the Transactions are pending, which could adversely affect Liberty Media’s business (with respect to the Liberty SiriusXM Group and New Sirius) and could adversely affect New Sirius.

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Sirius XM Holdings is subject to contractual restrictions while the Transactions are pending, which could adversely affect Sirius XM Holdings business.

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Certain of the directors and executive officers of Liberty Media and Sirius XM Holdings have interests relating to the Transactions or the Merger Agreement that are different from other Liberty Media and Sirius XM Holdings stockholders.

Factors Relating to New Sirius:

•

Sales of New Sirius Common Stock after the Transactions may negatively affect the market price of New Sirius Common Stock.

•

It is not certain that an active trading market will develop or be sustained after the Transactions, and following the Transactions, New Sirius’ stock price may fluctuate significantly.

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If, following the Split-Off, New Sirius is unable to satisfy the requirements of Section 404 of the Sarbanes-Oxley Act, or New Sirius’ internal control over financial reporting is not effective, the reliability of New Sirius’ financial statements may be questioned, and New Sirius’ stock price may suffer.

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It may be difficult for a third party to acquire New Sirius, even if doing so may be beneficial to New Sirius stockholders.

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New Sirius is expected to have overlapping directors with Liberty Media, which may lead to conflicting interests.

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Directors and officers of New Sirius are protected from liability for a broad range of actions.

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New Sirius’ holding company structure could restrict access to funds of its subsidiaries that may be needed to pay third party obligations.

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Following the Transactions, New Sirius, on a standalone basis and on a consolidated basis, will have significant indebtedness, and its subsidiaries’ debt will contain certain covenants that restrict its operations.

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New Sirius’ ability to incur additional indebtedness to fund its operations could be limited, which could negatively impact its operations.

Factors Relating to Sirius XM Holdings:

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Sirius XM Holdings faces substantial competition and that competition is likely to increase over time.

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If Sirius XM Holdings’ efforts to attract and retain subscribers and listeners, or convert listeners into subscribers, are not successful, its business will be adversely affected.

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Sirius XM Holdings engages in extensive marketing efforts and the continued effectiveness of those efforts is an important part of its business.

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Sirius XM Holdings relies on third parties for the operation of its business, and the failure of third parties to perform could adversely affect its business.

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Failure to successfully monetize and generate revenue from podcasts and other non-music content could adversely affect Sirius XM Holdings’ business, operating results, and financial condition.

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Sirius XM Holdings may not realize the benefits of acquisitions or other strategic investments and initiatives.

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The impact of economic conditions may adversely affect Sirius XM Holdings’ business, operating results, and financial condition.

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holders of Sirius XM Common Stock (in the aggregate, but other than Liberty Media and its subsidiaries) are expected to own New Sirius Common Stock representing approximately 19% of outstanding shares, in each case, immediately following the completion of the Merger. All of the foregoing percentages are approximations based on share information and net liabilities estimated as of such date and subject to change.

Comparative Per Share Market Price

Liberty Media Market Price

Each of LSXMA, LSXMB, LSXMK, FWONA, FWONK, LLYVA and LLYVK trade on the Nasdaq Global Select Market. FWONB and LLYVB are quoted on the OTC Markets. Stock price information for securities traded on the Nasdaq Global Select Market can be found on the Nasdaq website at www.nasdaq.com.

The following tables set forth the range of high and low sales prices of LSXMB, FWONB and LLYVB for the quarters listed below. Although LSXMB is traded on the Nasdaq Global Select Market, an established public trading market does not exist for the stock, as it is not actively traded. Additionally, there is no established public trading market for FWONB and LLYVB, which are quoted on OTC Markets. The over-the-counter market quotations for FWONB and LLYVB reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not necessarily represent actual transactions.

	Liberty SiriusXM common stock Series B (LSXMB)
	High			Low
2022
First Quarter		$	53.04		44.92
Second Quarter		$	47.14		40.00
Third Quarter		$	46.75		36.50
Fourth Quarter		$	47.43		39.03
2023
First Quarter		$	42.00		25.35
Second Quarter		$	31.51		26.18
Third Quarter(1)		$	34.80		22.19
Fourth Quarter		$	28.90		24.08
2024
First Quarter		$	31.53		28.70
Second Quarter		$	31.00		20.94
Third Quarter (through July 17, 2024)		$	24.20		22.73

	Liberty Formula One common stock Series B (FWONB)
	High			Low
2022
First Quarter		$	54.75		54.75
Second Quarter		$	70.26		56.65
Third Quarter		$	63.00		53.59
Fourth Quarter		$	48.75		47.78

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	Liberty Formula One common stock Series B (FWONB)
	High			Low
2023
First Quarter		$	68.02		54.31
Second Quarter		$	68.00		63.00
Third Quarter(1)		$	66.00		55.00
Fourth Quarter		$	56.02		56.02
2024
First Quarter		$	65.00		60.00
Second Quarter		$	66.50		58.51
Third Quarter (through July 17, 2024) . . . . . . . . . . . . . . . . . . . . . . . . . .		$	63.96		63.96

	Liberty Live common stock Series B (LLYVB)
	High			Low
2023
Third Quarter (from the initial quoting of LLYVB on August 4, 2023 through September 29, 2023)(1)		$	34.35		28.38
Fourth Quarter		$	33.50		31.18
2024
First Quarter		$	39.00		36.00
Second Quarter		$	40.00		33.50
Third Quarter (through July 17, 2024)(2) . . . . . . . . . . . . . . . . . . . . . . . . . .		$	40.00		33.50

(1)

On August 3, 2023, Liberty Media completed the reclassification of its then-existing common stock. Each outstanding share of Liberty SiriusXM Common Stock was reclassified into one share of the corresponding series of new Liberty SiriusXM Common Stock and 0.2500 of a share of the corresponding series of Liberty Live Common Stock, and each outstanding share of Liberty Formula One Common Stock was reclassified into one share of the corresponding series of new Liberty Formula One Common Stock and 0.0428 of a share of the corresponding series of Liberty Live Common Stock. No adjustments were made to the presented stock prices in 2022 or the first three quarters of 2023 to reflect these events.

(2)

Shares of LLYVB trade infrequently. During the third quarter of 2024 (through July 17, 2024), no trades occurred, as such the high and low prices shown for this period relate to the second quarter of 2024.

As of September 25, 2023, the last trading day prior to the public announcement that Liberty Media had communicated a proposal to the Special Committee outlining the terms of a proposed combination, LSXMB closed at $22.36, FWONB closed at $58.50 and LLYVB closed at $30.01.

Sirius XM Holdings Market Price

SIRI trades on the Nasdaq Global Select Market. Stock price information for securities traded on the Nasdaq Global Select Market can be found on the Nasdaq website at www.nasdaq.com.

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Selected Financial Data

Selected Financial Data for Liberty Media

The following tables present selected historical information relating to Liberty Media’s financial condition as of March 31, 2024 and December 31, 2023 and 2022 and its results of operations for the three-month periods ended March 31, 2024 and 2023 and for each of the years in the three-year period ended December 31, 2023. The following data should be read in conjunction with Liberty Media’s consolidated financial statements contained in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 and Annual Report on Form 10-K for the year ended December 31, 2023, which is incorporated by reference into this proxy statement/notice/prospectus/information statement. See the section entitled “Additional Information — Where You Can Find More Information.”

	March 31,			December 31,
	2024			2023		2022
	amounts in millions
Summary Balance Sheet Data:
Cash and cash equivalents		$	1,666		2,019		2,246
Investments in affiliates, accounted for using the equity method		$	1,996		1,089		952
Property and equipment, net		$	2,129		2,083		2,255
Goodwill		$	19,399		19,165		19,341
FCC Licenses		$	8,600		8,600		8,600
Intangible assets subject to amortization, net		$	3,889		3,872		4,288
Total assets		$	42,405		41,168		42,464
Total current liabilities		$	4,866		4,743		5,410
Long-term debt		$	14,257		14,180		14,953
Deferred income tax liabilities		$	2,202		2,086		2,101
Total equity		$	19,645		19,445		19,126

	Three months ended March 31					Year ended December 31,
	2024			2023		2023		2022		2021
	amounts in millions except per share amounts
Summary Statement of Operations Data:
Total revenue		$	2,749		2,556		12,525		12,164		11,400
Cost of Sirius XM Holdings Revenue		$	1,037		1,024		4,209		4,130		3,968
Cost of Formula 1 Revenue		$	279		206		2,240		1,750		1,489
Selling, general and administrative		$	465		486		1,930		2,031		1,907
Operating income (loss)		$	502		340		2,063		2,064		1,977
Interest expense		$	(191)		(196)		(782)		(689)		(642)
Share of earnings (losses) of affiliates, net		$	(19)		(10)		138		99		(200)
Realized and unrealized gains (losses) on financial instruments, net		$	(3)		(46)		(323)		599		(451)
Net earnings (loss) attributable to Liberty Media stockholders		$	203		15		761		1,815		398
Basic net earnings (loss) attributable to Series A, B and C Liberty SiriusXM common stock per share		$	0.61		0.56		2.54		3.94		1.79
Basic net earnings (loss) attributable to Series A, B and C Liberty Formula One common stock per share		$	0.33		(0.47)		0.79		2.39		(0.82)

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	Three months ended March 31					Year ended December 31,
	2024			2023		2023		2022		2021
	amounts in millions except per share amounts
Basic net earnings (loss) attributable to Series A, B and C Liberty Live common stock per share		$	(0.79)		NA		(1.54)		NA		NA
Basic net earnings (loss) attributable to Series A, B and C Liberty Braves common stock per share			N/A		(1.11)		(2.09)		(0.66)		(0.21)

Selected Financial Data for New Sirius

The following tables present selected combined historical information relating to the business, assets and liabilities of New Sirius upon the completion of the Transactions, which represents the combination of the historical financial information of Sirius XM Holdings and the business, assets and liabilities contributed to and assumed by New Sirius in the Contribution, including its financial condition as of March 31, 2024 and December 31, 2023 and 2022 and its results of operations for the three-month periods ended March 31, 2024 and 2023 and for each of the years in the three-year period ended December 31, 2023. All significant intercompany accounts and transactions have been eliminated in the combined financial statements. The financial data as of March 31, 2024 and December 31, 2023 and 2022 and for the three- month periods ended March 31, 2024 and 2023 and for each of the years in the three-year period ended December 31, 2023 has been derived from the combined historical financial statements of New Sirius included elsewhere in this proxy statement/notice/prospectus/information statement.

	March 31			December 31,
	2024			2023		2022
	amounts in millions
Summary Balance Sheet Data:
Cash and cash equivalents		$	135		306		362
Property and equipment, net		$	1,855		1,791		1,551
FCC Licenses		$	8,600		8,600		8,600
Goodwill		$	15,209		15,209		15,209
Total assets		$	30,811		30,056		30,454
Total current liabilities		$	3,796		3,951		4,358
Long-term debt		$	10,056		10,073		10,689
Deferred tax liabilities		$	2,388		2,414		2,461
Total equity		$	13,324		13,102		12,371

	Three months ended March 31					Year ended December 31,
	2024			2023		2023		2022		2021
	amounts in millions except per share amounts
Summary Statement of Operations Data:
Total revenue		$	2,162		2,144		8,953		9,003		8,696
Income from operations		$	409		373		1,808		1,919		1,917
Interest expense		$	(129)		(134)		(534)		(503)		(481)
Net income (loss) attributable to Liberty Sirius XM Holdings Inc.		$	199		193		786		908		1,062
Unaudited pro forma net income attributable to Liberty Sirius XM Holdings Inc. per share – basic		$	0.59		NA		2.35		NA		NA

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Selected Financial Data for Sirius XM Holdings

The following tables present selected historical information relating to Sirius XM Holdings’ financial condition as of March 31, 2024 and December 31, 2023 and 2022 and its results of operations for the three-month periods ended March 31, 2024 and 2023 and for each of the years in the three-year period ended December 31, 2023. The following data should be read in conjunction with Sirius XM Holdings’ consolidated financial statements contained in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 and Annual Report on Form 10-K for the year ended December 31, 2023, which is incorporated by reference into this proxy statement/notice/prospectus/information statement. See the section entitled “Additional Information — Where You Can Find More Information.”

	March 31, 2024			December 31,
	March 31, 2024			2023		2022
	amounts in millions
Summary Balance Sheet Data:
Cash and cash equivalents		$	71		216		57
Property and equipment, net		$	1,820		1,754		1,499
Goodwill		$	3,249		3,249		3,249
Total assets		$	11,174		10,374		10,022
Total current liabilities		$	3,088		3,226		2,981
Long-term debt		$	8,722		8,690		9,256
Deferred tax liabilities		$	488		509		565
Total equity (deficit)		$	(2,370)		(2,565)		(3,351)

	There months ended March 31,					Year ended December 31,
	2024			2023		2023		2022		2021
	amounts in millions except per share amounts
Summary Statement of Operations Data:
Total revenue		$	2,162		2,144		8,953		9,003		8,696
Income from operations		$	437		412		1,946		2,036		2,015
Interest expense		$	(104)		(107)		(423)		(422)		(415)
Net income		$	265		233		1,258		1,213		1,314
Basic net income per common share		$	0.07		0.06		0.33		0.31		0.32

Selected Unaudited Condensed Pro Forma Consolidated Financial Data of Liberty Media

The following tables present selected pro forma information relating to Liberty Media’s financial condition as of March 31, 2024 and its results of operations for the three-month period ended March 31, 2024 and the year ended December 31, 2023 to show the pro forma impact of the Split-Off. The pro forma balance sheet information assumes that the Split-Off had occurred as of March 31, 2024. The pro forma results of operations data assumes the Split-Off had occurred as of January 1, 2023. The pro forma information has been derived from the unaudited historical financial statements of Liberty Media for the three-month period ended March 31, 2024 and the audited historical financial statements of Liberty Media for the year ended December 31, 2023, which are incorporated by reference into this proxy statement/notice/prospectus/information statement. See the section entitled “Additional Information — Where You Can Find More Information.”

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	March 31, 2024
	Pro Forma
	amounts in millions
Summary Balance Sheet Data:
Cash and cash equivalents		$	1,531
Goodwill		$	4,190
Intangible assets subject to amortization, net		$	2,898
Total assets		$	11,879
Total current liabilities		$	1,169
Long-term debt		$	4,210
Total equity		$	6,321

	Three months ended March 31, 2024			Year ended December 31, 2023
	Pro Forma
	amounts in millions except per share amounts
Summary Statement of Operations Data:
Total revenue		$	587		3,572
Cost of Formula 1 revenue		$	279		2,240
Operating income (loss)		$	93		255
Interest expense		$	(62)		(248)
Share of earnings (losses) of affiliates, net		$	(24)		157
Realized and unrealized gains (losses) on financial instruments, net		$	(21)		(235)
Net earnings (loss) attributable to Liberty Media stockholders		$	4		(25)
Basic net earnings (loss) attributable to Series A, B and C Liberty SiriusXM common stock per share			NA		NA
Basic net earnings (loss) attributable to Series A, B and C Liberty Formula One common stock per share		$	0.33		0.79
Basic net earnings (loss) attributable to Series A, B and C Liberty Live common stock per share		$	(0.79)		(1.54)
Basic net earnings (loss) attributable to Series A, B and C Liberty Braves common stock per share			NA		(2.09)

Dividends

Liberty Media. Liberty Media has never paid cash dividends on any series of its common stock. All decisions regarding payment of dividends by Liberty Media are made by its board of directors in accordance with applicable law after taking into account various factors, including its financial condition, operating results, current and anticipated cash needs, plans for expansion and possible loan covenants which may restrict or prohibit payment of dividends.

New Sirius. New Sirius currently expects to pay a quarterly cash dividend to holders of New Sirius Common Stock, although it has no obligation to do so, and its dividend policy may change at any time without notice to its stockholders. The declaration and payment of dividends will be at the discretion of New Sirius’ board of directors in accordance with applicable law after considering various factors, including the company’s financial condition, operating results, current and anticipated cash needs, limitations imposed by its indebtedness, legal requirements and other factors that its board of directors deems relevant.

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RISK FACTORS

In addition to the other information contained in, incorporated by reference in or included as an Annex to this proxy statement/notice/prospectus/information statement, including the matters addressed in “Cautionary Statements Regarding Forward-Looking Statements,” you should carefully consider the following risk factors in deciding whether to vote to approve the Split-Off Proposal.

The risk factors described in this section have been separated into two groups:

•

risks that relate to the Transactions, which include risks relating to the Split-Off, the Merger and New Sirius’ corporate history; and

•

risks relating to an investment in New Sirius and risks relating to New Sirius’ ownership of Sirius XM Holdings following the Split-Off.

The risks described below and elsewhere in this proxy statement/notice/prospectus/information statement are considered to be the most material but are not the only ones that relate to the Split-Off, the Merger, an investment in New Sirius or Sirius XM Holdings becoming a wholly owned subsidiary of New Sirius. There may be other unknown or unpredictable economic, business, competitive, regulatory or other factors that also could have material adverse effects on New Sirius or Sirius XM Holdings. Past financial performance may not be a reliable indicator of future performance and historical trends should not be used to anticipate results or trends in future periods especially given the current economic environment. Additionally, Liberty Media’s annual report on Form 10-K for the year ended December 31, 2023, which is incorporated by reference into this proxy statement/notice/prospectus/information statement, describes the most material risks that relate to the Liberty SiriusXM Group tracking stock structure and an investment in Liberty Media.

If any of the events described below or incorporated by reference were to occur, the businesses, prospects, financial condition, results of operations and/or cash flows of New Sirius could be materially adversely affected. In any such case, the price of the New Sirius Common Stock could decline, perhaps significantly.

For the purposes of the risk factors relating to the Split-Off enumerated below, unless the context otherwise indicates, it is assumed that the Split-Off Proposal is approved and that the Split-Off has been completed (without regard to whether the Merger occurs). For the purposes of the risk factors relating to the Merger enumerated below, unless the context otherwise indicates, it is assumed that the Split-Off Proposal is approved and that the Merger has been completed.

Factors Relating to the Transactions

The Exchange Ratio is a calculation that is subject to a number of factors that will not be known until just before the closing.

The number of shares of New Sirius Common Stock into which shares of Liberty SiriusXM Common Stock will be exchanged will be determined by the Exchange Ratio. The Exchange Ratio is a calculation that will not be known until closer to the date of closing of the Redemption and is based on a variety of factors that will not be known until then, including, among other things, the net financial liabilities of the Liberty SiriusXM Group (excluding Liberty Media’s 3.75% Convertible Senior Notes due 2028, but including Liberty Media’s 2.75% Exchangeable Senior Debentures due 2049 and the Margin Loan), including its interest expense, and other liabilities for transaction fees and expenses, financing fees and litigation-related liabilities, the average of the daily VWAP of shares of both LSXMA and LSXMK for the ten consecutive trading days ending on the Measurement Date and other corporate adjustments. Because the Exchange Ratio is not fixed and will vary, the number of shares of New Sirius Common Stock to be received by holders of Liberty SiriusXM Common Stock in the Redemption may change from the estimated Exchange Ratio. Changes in the Exchange Ratio will impact the proportion of issued and outstanding New Sirius Common Stock following the completion of the Transactions represented by the shares of New Sirius Common Stock issued to former holders of Liberty SiriusXM Common Stock relative to former holders of Sirius XM Common Stock in the Transactions. Although the Exchange Ratio will likely not meaningfully change as a result of changes in the market value of the shares of Liberty SiriusXM Common Stock, it is subject to final

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adjustments and will not be calculated prior to voting on the Split-Off Proposal at the Liberty Special Meeting. Changes to the Exchange Ratio will impact the value of Liberty SiriusXM Common Stock relative to Sirius XM Common Stock in the Merger and, as a result, will impact the value of shares of Liberty SiriusXM Common Stock.

The number of shares received by holders of Liberty SiriusXM Common Stock in the Split-Off is based on an Exchange Ratio that does not take into account fluctuations in the share prices of Sirius XM Common Stock between the date of the Reorganization Agreement and the Merger Agreement and/or the date of the First Amendments, respectively, and the completion of the Transactions. In addition, changes in the share price of Sirius XM Common Stock will not impact the SiriusXM Exchange Ratio and changes in the share price of Liberty SiriusXM Common Stock will not meaningfully impact the Exchange Ratio. For more information, see “Questions and Answers — What factors could impact the calculation of the Exchange Ratio?” and “Questions and Answers — What will happen to the Exchange Ratio if the trading prices of shares Liberty SiriusXM Common Stock or Sirius XM Common Stock change between now and the measurement date of the Exchange Ratio?” As a result, stock price changes may impact the value of the consideration expected to be received in the Transactions, and no assurance can be given as to the market value of New Sirius Common Stock. Such stock price changes may result from a variety of factors (many of which are beyond the control of Sirius XM Holdings or Liberty Media), including:

•

changes in, or changes in market expectations of, the companies’ respective businesses, operations, assets, liabilities and prospects, investor behavior and strategies, including market assessments of the likelihood that the transactions will be completed;

•

interest rates, general market and economic conditions and other factors generally affecting the market price of the companies’ common stock;

•

federal, state and local legislation, governmental regulation and legal developments in the businesses in which the companies operate; and

•

other factors beyond the control of either Sirius XM Holdings or Liberty Media, including those described under this heading “Risk Factors.”

It is expected that the Split-Off and Merger will cause a reduction in the voting power held by certain holders of Liberty SiriusXM Common Stock with respect to the business, assets and liabilities of Sirius XM Holdings. Pursuant to Liberty Media’s certificate of incorporation, holders of LSXMA are currently entitled to one vote for each share of such stock held on all matters submitted to a vote of stockholders, holders of LSXMB are currently entitled to ten votes for each share of such stock held on all matters submitted to a vote of stockholders, and holders of LSXMK are currently not entitled to any voting powers (including with respect to any class votes taken in accordance with the terms of Liberty Media’s certificate of incorporation), except as otherwise required by Delaware law, in which case each share of LSXMK is entitled to 1/100th of a vote. Following the Split-Off, holders of record of New Sirius Common Stock will be entitled to one vote for each share of such stock held on all matters submitted to a vote of stockholders. Further, as a result of the Transactions, holders of Liberty SiriusXM Common Stock immediately prior to the Split-Off will experience a reduction of their aggregate voting power with respect to the business, assets and liabilities of Sirius XM Holdings. Following the Transactions, based on the estimated Exchange Ratio of approximately 0.83, because New Sirius will have a single class of voting stock, holders of LSXMA, LSXMB and LSXMK immediately prior to the Split-Off are expected to hold approximately 24%, 2% and 54% of the aggregate voting power of New Sirius, respectively (assuming no changes to the number of outstanding shares of LSXMA, LSXMB, LSXMK and Sirius XM Holdings since April 30, 2024). Further,

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following the Transactions, based on the estimated Exchange Ratio of approximately 0.83, it is expected that such former holders of Liberty SiriusXM Common Stock will own approximately 81% of New Sirius, whereas, approximately 83% interest in Sirius XM Holdings is currently attributed to the Liberty SiriusXM Group. Following the Split-Off and the Merger, Liberty Media will no longer hold any equity interest in Sirius XM Holdings or New Sirius, there will not be a majority stockholder of New Sirius, and New Sirius will not be deemed a “controlled company” under applicable exchange listing standards.

Upon the completion of the Split-Off, holders of Liberty SiriusXM Common Stock will no longer be stockholders of Liberty Media. Instead, former holders of Liberty SiriusXM Common Stock will become holders of New Sirius Common Stock and their rights as New Sirius stockholders will be governed by the terms of New Sirius’ amended and restated charter and the amended and restated bylaws of New Sirius (New Sirius’ amended and restated bylaws). The terms of New Sirius’ amended and restated charter and New Sirius’ amended and restated bylaws are in some respects materially different than the terms of Liberty Media’s certificate of incorporation and bylaws, which currently govern the rights of holders of Liberty SiriusXM Common Stock. See the section entitled “Description of New Sirius Capital Stock and Comparison of Stockholder Rights — Comparison of Stockholder Rights” for a discussion of the different rights associated with shares of New Sirius Common Stock and shares of Liberty SiriusXM Common Stock.

The shares of New Sirius Common Stock to be received by Sirius XM Holdings stockholders upon the completion of the Merger will have different rights from shares of Sirius XM Common Stock.

Upon the completion of the Transactions, holders of Sirius XM Common Stock will no longer be stockholders of Sirius XM Holdings. Instead, former holders of Sirius XM Common Stock (other than New Sirius and its subsidiaries) will become holders of New Sirius Common Stock and their rights as New Sirius stockholders will be governed by the terms of New Sirius’ amended and restated charter and amended and restated bylaws. New Sirius’ amended and restated charter and amended and restated bylaws are in some respects materially different than the terms of the amended and restated certificate of incorporation of Sirius XM Holdings (Sirius XM Holdings’ certificate of incorporation) and the amended and restated by-laws of Sirius XM Holdings (Sirius XM Holdings’ bylaws), which currently govern the rights of Sirius XM Holdings stockholders. See the section entitled “Description of New Sirius Capital Stock and Comparison of Stockholder Rights — Comparison of Stockholder Rights” for a discussion of the different rights associated with shares of New Sirius Common Stock and shares of Sirius XM Common Stock.

The Split-Off Transactions could result in significant tax liability.

The Split-Off is conditioned upon the receipt by Liberty Media of the opinion of Skadden Arps, tax counsel to Liberty Media, to the effect that, among other things, the Split-Off Transactions will qualify as a generally tax-free transaction under Section 355, Section 368(a)(1)(D) and related provisions of the Code to Liberty Media and to holders of Liberty SiriusXM Common Stock. The condition to the Split-Off relating to the receipt by Liberty Media of the opinion of Skadden Arps may not be waived.

The opinion of Skadden Arps will be based on the law in effect as of the time of the Split-Off and will rely on certain assumptions, as well as statements, representations, and undertakings made by officers of Liberty Media, New Sirius, Sirius XM Holdings and certain other individuals. If any of those statements, representations, or assumptions is incorrect or untrue in any material respect or any of those undertakings is not complied with, or if the facts upon which the opinion of Skadden Arps is based are materially different from the actual facts that exist at the time of the Split-Off, the conclusions reached in such opinion could be adversely affected. Liberty Media will not obtain a private letter ruling from the IRS regarding the qualification of the Split-Off under Section 355, Section 368(a)(1)(D) and related provisions of the Code. The legal authorities on which the opinion of Skadden Arps will be based are subject to change or differing interpretations at any time, possibly with retroactive effect. Opinions of counsel are not binding on the IRS or the courts, and there can be no assurance that the IRS will not challenge the conclusions reached in

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such opinion or that a court would not sustain such a challenge. If it is subsequently determined that the Split-Off Transactions do not qualify under Section 355, Section 368(a)(1)(D) and related provisions of the Code, Liberty Media and the holders of Liberty SiriusXM Common Stock who receive New Sirius Common Stock pursuant to the Split-Off could incur significant tax liabilities. Pursuant to Liberty Media’s management and allocation policies, following the completion of the Split-Off and the Merger, the cash for the payment of any taxes and losses resulting from the Split-Off Transactions, which are not allocated to and paid by New Sirius pursuant to the Tax Sharing Agreement, generally would be drawn from funds attributed to the Liberty Live Group, except that cash for the payment of any taxes and losses (a) resulting primarily from a breach by Liberty Media following the Split-Off Transactions of any contractual covenants made by Liberty Media in connection with the Split-Off Transactions or (b) resulting from Section 355(e) of the Code applying to the Split-Off Transactions as a result of the Split-Off Transactions being part of a plan (or series of related transactions) pursuant to which one or more persons acquire a 50-percent or greater interest (measured by vote or value) in the stock of Liberty Media shall, in each case, be drawn proportionately from funds attributed to the Formula One Group and the Liberty Live Group based upon the relative market capitalizations of Liberty Formula One Common Stock and Liberty Live Common Stock following the Split-Off. For a more complete discussion of the tax opinion and the tax consequences if the Split-Off Transactions do not qualify for the intended U.S. federal income tax treatment, please see “U.S. Federal Income Tax Consequences — Tax Opinions” and “— U.S. Federal Income Tax Treatment of the Split-Off.”

Even if the Split-Off Transactions otherwise qualify under Section 355, Section 368(a)(1)(D) and related provisions of the Code, the Split-Off would result in a significant U.S. federal income tax liability to Liberty Media (but not to holders of Liberty SiriusXM Common Stock) under Section 355(e) of the Code if one or more persons acquire, directly or indirectly, a 50% or greater interest (measured by vote or value) in the stock of Liberty Media or New Sirius (or any successor corporation) (excluding, for this purpose, the acquisition of New Sirius Common Stock by holders of Liberty SiriusXM Common Stock in the Split-Off, but including the acquisition of New Sirius Common Stock by holders of Sirius XM Common Stock in the Merger) as part of a plan or series of related transactions that includes the Split-Off. The process for determining whether an acquisition is part of a plan under these rules is complex, inherently factual in nature, and subject to a comprehensive analysis of the facts and circumstances of the particular case. Notwithstanding the opinion of Skadden Arps described above, Liberty Media or New Sirius might inadvertently cause or permit a prohibited change in the ownership of Liberty Media or New Sirius to occur. If the Split-Off were determined to be taxable to Liberty Media under Section 355(e) of the Code, Liberty Media would incur significant tax liabilities. For a more complete discussion of the tax consequences if the Split-Off is determined to be taxable to Liberty Media under Section 355(e) of the Code, please see “U.S. Federal Income Tax Consequences — U.S. Federal Income Tax Treatment of the Split-Off.”

New Sirius may have a significant indemnity obligation to Liberty Media, which is not limited in amount or subject to any cap, if the Split-Off Transactions are treated as a taxable transaction.

Pursuant to the Tax Sharing Agreement that New Sirius and Liberty Media will enter into in connection with the Split-Off, New Sirius will be required to indemnify Liberty Media, its subsidiaries and certain related persons for taxes and losses (other than any taxes or tax-related losses that result from Section 355(e) of the Code applying to the Split-Off as a result of the Split-Off being part of a plan (or series of related transactions) pursuant to which one or more persons acquire a 50-percent or greater interest (measured by vote or value) in the stock of Liberty Media) resulting from the failure of the Split-Off Transactions to qualify as a generally tax-free transaction under Section 355, Section 368(a)(1)(D) and related provisions of the Code to the extent that such taxes and losses (a) result primarily from, individually or in the aggregate, the breach of certain covenants made by New Sirius (applicable to actions or failures to act by New Sirius and its subsidiaries following the completion of the Split-Off), (b) result primarily from, individually or in the aggregate, the failure of certain representations made by Sirius XM Holdings in support of the opinion of Skadden Arps regarding the generally tax-free status of the Split-Off Transactions to be true and correct, or (c) result from the application of Section 355(e) of the Code to the Split-Off as a result of the treatment of the Split-Off as part of a plan (or series of related transactions) pursuant to which one or more persons acquire, directly or indirectly, a 50% or greater interest (measured by vote or value) in the stock of New Sirius (or any successor corporation), except, in the case of clauses (a) and (b), if such taxes and losses result from an action required to be taken pursuant to the Transaction Agreements.

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New Sirius’ indemnification obligations to Liberty Media, its subsidiaries and certain related persons will not be limited in amount or subject to any cap. If New Sirius is required to indemnify Liberty Media, its subsidiaries or such related persons under the circumstances set forth in the Tax Sharing Agreement, New Sirius may be subject to substantial liabilities, which could materially adversely affect its financial position.

For a more detailed discussion of the Tax Sharing Agreement, see “Transaction Agreements — Tax Sharing Agreement.”

New Sirius may determine to forgo certain transactions that might otherwise be advantageous in order to avoid the risk of incurring significant tax-related liabilities.

Under the Tax Sharing Agreement, New Sirius will agree not to take certain actions, or fail to take any action, following the Split-Off, which action or failure to act would be inconsistent with the Split-Off Transactions qualifying under Section 355, Section 368(a)(1)(D) and related provisions of the Code. In particular, for the two-year period following the distribution, as described in the section entitled “Transaction Agreements — Tax Sharing Agreement,” New Sirius will be subject to specific restrictions that are intended to preserve the generally tax-free status of the Split-Off, including restrictions on its ability to discontinue the conduct of certain businesses, to merge, consolidate, liquidate, or dissolve New Sirius or Sirius XM Holdings, to redeem or repurchase New Sirius Common Stock, or to enter into certain other corporate transactions that may cause New Sirius to undergo either a 45% or greater change in the ownership of its voting stock or a 45% or greater change in the ownership (measured by value) of all classes of its stock, taking into account the Merger. Further, the Tax Sharing Agreement will require that New Sirius indemnify Liberty Media for any taxes or losses (subject to certain exceptions) incurred by Liberty Media (or its subsidiaries) to the extent that such taxes and losses (a) result primarily from, individually or in the aggregate, the breach of certain covenants made by New Sirius (applicable to actions or failures to act by New Sirius and its subsidiaries following the completion of the Split-Off), (b) result primarily from, individually or in the aggregate, the failure of certain representations made by Sirius XM Holdings in support of the opinion of Skadden Arps regarding the generally tax-free status of the Split-Off Transactions to be true and correct, or (c) result from the application of Section 355(e) of the Code to the Split-Off as a result of the treatment of the Split-Off as part of a plan (or series of related transactions) pursuant to which one or more persons acquire, directly or indirectly, a 50% or greater interest (measured by vote or value) in the stock of New Sirius (or any successor corporation).

Under Section 355(e) of the Code, an acquisition of New Sirius’ stock would generally be presumed to be part of a plan (or series of related transactions) with the Split-Off if such acquisition occurs within two years before or after the Split-Off (or if such stock is received in the Split-Off in exchange for Liberty SiriusXM Common Stock that was acquired within the two years before the Split-Off). This presumption, however, may be rebutted based upon an analysis of the facts and circumstances related to the Split-Off and the particular acquisition in question, including a weighing of certain plan and non-plan factors set forth in U.S. Treasury Regulations promulgated under Section 355(e) of the Code. Further, these U.S. Treasury Regulations provide certain safe harbors under which an acquisition will be deemed not to be part of a plan (or series of related transactions) with the Split-Off for purposes of Section 355(e) of the Code.

In light of the Tax Sharing Agreement and the requirements under Section 355 of the Code, including the factors and safe harbors described above, New Sirius may determine to forgo certain transactions that might otherwise be advantageous. In particular, New Sirius may determine to continue to operate certain of its business operations for the foreseeable future even if a sale of such business operations might otherwise be advantageous. Moreover, New Sirius might determine to forgo certain transactions, including share repurchases, stock issuances, certain asset dispositions and other strategic transactions, for some period of time following the Split-Off. In addition, New Sirius’ indemnity obligations under the Tax Sharing Agreement might discourage, delay or prevent its entering into a change of control transaction for some period of time following the Split-Off.

Liberty Media, Sirius XM Holdings and New Sirius will incur direct and indirect costs and expenses as a result of the Transactions.

Each of Liberty Media and Sirius XM Holdings have incurred, and expect to further incur, certain nonrecurring costs in connections with the Transactions. Liberty Media and Sirius XM Holdings estimate

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their aggregate out-of-pocket costs related to the Transactions to be approximately $93.8 million in the aggregate, primarily consisting of investment banking, legal and accounting fees and financial printing and other related charges. The payment of costs related to the Transactions will adversely affect the short-term operating results and cash flows of New Sirius. The foregoing estimate is preliminary and subject to change. If the Transactions are not consummated, Liberty Media, New Sirius and Sirius XM Holdings will be responsible for their respective transaction costs and expenses in connection with the Transactions for which they will receive no benefit, except in the case that the Merger Agreement is terminated by Sirius XM Holdings as a result of a Liberty Adverse Recommendation Change, in which case Liberty Media will be required to pay to Sirius XM Holdings a termination fee equal to $450 million in cash. Although Liberty Media and Sirius XM Holdings expect that the realization of benefits related to the Transactions will offset such costs and expenses over time, no assurances can be made that the net benefits will be achieved in the near term, or at all.

All fees and expenses incurred in connection with the Merger Agreement and the transactions contemplated thereby will be borne by the parties incurring such fees or expenses. However, Sirius XM Holdings will pay for the portion of the SEC filing fee applicable to the Form S-4 of which this proxy statement/notice/prospectus/information statement forms a part (the Form S-4) which is attributable to the shares of New Sirius Common Stock to be issued to the holders of Sirius XM Common Stock in the Merger; and New Sirius will pay for the portion of the SEC filing fee applicable to the Form S-4 which is attributable to the shares of New Sirius Common Stock to be issued to the holders of LSXMA, LSXMB and LSXMK, as applicable, and the options to purchase shares of New Sirius Common Stock issued in the substitution of existing stock options to purchase shares of LSXMK. Due to Liberty Media’s ownership of approximately 83% of Sirius XM Holdings, holders of Liberty SiriusXM Common Stock will indirectly bear its allocable share of these amounts. Additionally holders of Liberty SiriusXM Common Stock will directly bear, in the form of an adjustment to the Exchange Ratio, the amount of fees and expenses incurred by Liberty Media and its subsidiaries in connection with the Merger Agreement and the completion of the Transactions. Liberty Media and Sirius XM Holdings will share the costs related to the submission of applications to the FCC for authorization to transfer control of subsidiaries of Sirius XM Holdings that hold FCC licenses and authorizations, the associated FCC licenses and authorizations from Liberty Media to New Sirius, and the pro forma applications for approval of the Conversion.

Management of both Sirius XM Holdings and Liberty Media may be required to divert a disproportionate amount of attention away from their respective day-to-day activities and operations, and devote time and effort to consummating the Transactions. The risks, and adverse effects, of such disruptions and diversions could be exacerbated by a delay in the completion of the Transactions. These factors could adversely affect the financial position or results of operations of Liberty Media and Sirius XM Holdings, regardless of whether the Transactions are completed.

The Merger Agreement imposes certain restrictive interim covenants on Liberty Media (with respect to the Liberty SiriusXM Group and New Sirius) and New Sirius during the pendency of the Merger Agreement. For instance, subject to certain exceptions set forth in the Merger Agreement, the consent of the Special Committee (on behalf of Sirius XM Holdings) is required in respect of, among other things, amendments to Liberty Media’s (with respect to the Liberty SiriusXM Group) or New Sirius’ organizational documents, the incurrence of debt for borrowed money, payments of certain dividends with respect to Liberty SiriusXM Common Stock and New Sirius Common Stock, certain issuances of shares of Liberty SiriusXM Common Stock and New Sirius Common Stock and payments of certain liabilities. These restrictions may prevent Liberty Media and New Sirius from taking certain actions during the period from the date of the Merger Agreement to the Merger Effective Time, including making certain acquisitions or otherwise pursuing certain business opportunities, or making certain changes to shares of Liberty SiriusXM Common

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Stock or New Sirius Common Stock, that the Liberty Media and New Sirius board of directors, respectively, may deem beneficial. See the section entitled “Transaction Agreements — Merger Agreement — Conduct of Business” for a description of the restrictive covenants applicable to Liberty Media (with respect to the Liberty SiriusXM Group and New Sirius) and New Sirius, as applicable.

Sirius XM Holdings is subject to contractual restrictions while the Transactions are pending, which could adversely affect Sirius XM Holdings business.

The Merger Agreement imposes certain restrictive interim covenants on Sirius XM Holdings during the pendency of the Merger Agreement. For instance, subject to certain exceptions set forth in the Merger Agreement, the consent of Liberty Media and New Sirius is required in respect of, among other things, payments of certain dividends with respect to Sirius XM Common Stock, certain issuances of shares of Sirius XM Common Stock and entering into a new line of business or disposing of or materially modifying operations with respect to an existing line of business. These restrictions may prevent Sirius XM Holdings from taking certain actions during the period from the date of the Merger Agreement to the Merger Effective Time, including making certain acquisitions or otherwise pursuing certain business opportunities, or making certain changes to shares of Sirius XM Common Stock that the Sirius XM Holdings board of directors may deem beneficial. See the section entitled “Transaction Agreements — Merger Agreement — Conduct of Business” for a description of the restrictive covenants applicable to Sirius XM Holdings.

The Liberty Media and Sirius XM Holdings directors and executive officers have certain indemnification and insurance protections for their service as directors and executive officers of Liberty Media and Sirius XM Holdings, respectively. For any directors or executive officers of Liberty Media that will serve as directors or executive officers of New Sirius following the completion of the Transactions, New Sirius will obtain director and officer liability insurance to cover all directors and executive officers of New Sirius. In addition, the directors and officers of Sirius XM Holdings and its subsidiaries will have the right to indemnification and continued coverage under a tail directors’ and officers’ liability insurance policy following the Merger.

Directors and executive officers of Liberty Media hold stock options and/or restricted stock units with respect to Liberty SiriusXM Common Stock, which, (a) in the case of each stock option outstanding immediately prior to the Split-Off, will become fully vested immediately prior to, and contingent upon, the Split-Off Effective Time and be converted into a New Sirius option award based on the Exchange Ratio and (b) in the case of each restricted stock award and restricted stock unit outstanding as of ten business days prior to the Redemption Date (or such other date on or around that time as may be determined by the board of directors of Liberty Media (or an authorized committee thereof)), will become fully vested and, net of taxes, will be treated as an outstanding share of Liberty SiriusXM Common Stock in the Redemption, in each case, as discussed in more detail below in “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Liberty Media in the Transactions — Equity Awards” and “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards.” As discussed below in “The Split-Off Proposal — Effect of the Split-Off on Outstanding Liberty SiriusXM Incentive Awards — Transitional Plan,” the shares of New Sirius Common Stock underlying New Sirius option awards held by any individual who will serve as a member of the New Sirius board of directors can be registered on a Form S-8 and will be settled in shares upon exercise. Shares of New Sirius Common Stock underlying other New Sirius option awards that may not be able to be registered on a Form S-8 will be settled in cash upon exercise.

Certain of the Liberty Media directors and executive officers hold shares of Sirius XM Common Stock, stock options with respect to Sirius XM Common Stock and restricted stock units with respect to Sirius XM Common Stock. Those shares will be converted in the Merger into the right to receive shares of New Sirius Common Stock, and such options and restricted stock units will be treated as discussed in more detail under “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Sirius XM Holdings in the Transactions — Equity Awards” and “The Merger — Treatment of Outstanding Equity Awards.”

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The Liberty Media and Sirius XM Holdings boards of directors include two overlapping members: Mr. Maffei and Mr. Evan Malone. Mr. Maffei is a member of the Liberty Media board of directors and the President and Chief Executive Officer of Liberty Media and is also the Chairman of the Sirius XM Holdings board of directors. Mr. Evan Malone is a non-employee member of each of the Liberty Media board of directors and Sirius XM Holdings board of directors. In addition, Ms. Hickenlooper, a non-employee director of Sirius XM Holdings, also serves Liberty Media as Senior Vice President, Corporate Development, and David A. Blau, a non-employee director of Sirius XM Holdings, served Liberty Media as Executive Vice President, Corporate Development, until December 31, 2023 and then as a Senior Advisor until June 28, 2024. As of April 30, 2024, each of Mr. Maffei, Mr. Evan Malone, Mr. Blau and Ms. Hickenlooper hold shares of Liberty SiriusXM Common Stock, stock options with respect to Liberty SiriusXM Common Stock and, except for Mr. Blau, restricted stock units with respect to Liberty SiriusXM Common Stock. Those shares will be redeemed in the Split-Off for shares of New Sirius Common Stock, and such options and restricted stock units will be treated as discussed below under “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Liberty Media in the Transactions — Equity Awards.”

Mr. Malone is the Chairman of the Liberty Media board of directors. Under the Voting Agreement, each of Sirius XM Holdings and New Sirius, jointly and severally, has agreed to indemnify each Malone Stockholder for certain losses incurred in connection with or arising out of the Voting Agreement. In addition, Sirius XM Holdings and New Sirius have agreed to pay up to $150,000 in the aggregate of reasonable out-of-pocket costs and expenses incurred by the Malone Stockholders in connection with the preparation, negotiation, execution and delivery of the Voting Agreement. See “Transaction Agreements — Voting Agreement” below.

Effective as of the completion of the Merger, Mr. Maffei is expected to serve as the Chairman of the New Sirius board of directors and Ms. Witz is expected to serve as the Chief Executive Officer of New Sirius and a member of the New Sirius board of directors. All of the executive officers of Sirius XM Holdings immediately prior to the Merger Effective Time will be the executive officers of New Sirius following the Transactions and will continue to provide services in such capacity following the Transactions. Additionally, Mr. Hartenstein, Mr. Evan Malone, Mr. Meyer, Ms. Procope, Mr. Rapino, Ms. Salen and Mr. Zaslav are currently directors of Sirius XM Holdings and are expected to serve as directors of New Sirius following the Transactions.

For a detailed discussion of these and other interests, see “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Liberty Media in the Transactions” below and see “The Proposed Transactions — Interests of Certain Persons — Interests of Directors and Executive Officers of Sirius XM Holdings in the Transactions” below.

The Transactions may not be completed on the terms or timeline currently contemplated, or at all, as Liberty Media, New Sirius or Sirius XM Holdings may be unable to satisfy the conditions or obtain the approvals required to complete the Transactions or such approvals may contain material restrictions or conditions.

The completion of the Transactions is subject to a number of conditions, as described in this proxy statement/notice/prospectus/information statement, including the occurrence of certain events contemplated by the Reorganization Agreement and the Merger Agreement. None of Liberty Media, New Sirius or Sirius XM Holdings can make any assurances that the Transactions will be completed on the terms or timeline currently contemplated, or at all. Some of the conditions to the completion of the Transactions are outside the control of Liberty Media, New Sirius and Sirius XM Holdings. Each of Liberty Media, New Sirius and Sirius XM Holdings has and will continue to expend time and resources and incur expenses related to the proposed Transactions.

Although each of Liberty Media, New Sirius and Sirius XM Holdings has agreed to use reasonable best efforts, subject to certain limitations, to make certain governmental filings and obtain the required governmental approvals, as the case may be, there can be no assurance that the relevant approvals will be obtained. As a condition to approving the Transactions, these governmental authorities may impose conditions, terms, obligations or restrictions or require divestitures or place restrictions on the conduct of New Sirius’ business after the completion of the Transactions. There can be no assurance that regulators will not impose conditions, terms, obligations or restrictions or require divestitures and that such conditions,

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terms, obligations, restrictions or required divestitures will not have the effect of delaying or preventing completion of the Transactions or imposing additional material costs on or materially limiting the revenues of New Sirius following the Transactions, or otherwise adversely affecting, including to a material extent, New Sirius’ business, financial condition and results of operations after the completion of the Transactions. There can be no assurance that any such conditions, terms, obligations, restrictions or required divestitures will not result in the abandonment of the Transactions.

The completion of the Split-Off under the Reorganization Agreement is subject to a number of closing conditions and, if these conditions are not satisfied or waived (if permissible under the Reorganization Agreement), the Reorganization Agreement may be terminated in accordance with its terms and the Split-Off may not be completed. In addition, the parties have the right to terminate the Reorganization Agreement under other specified circumstances, in which case the Transactions would not be completed.

The Split-Off is subject to a number of closing conditions and, if these conditions are not satisfied or waived (if permissible under the Reorganization Agreement), the Split-Off will not be completed. These conditions include, among others: (1) the satisfaction (or, if permissible, waiver) of the conditions set forth in the Merger Agreement, other than the condition that the Split-Off be completed and the condition that the conditions in the Reorganization Agreement be satisfied, and (2) the absence of any law, order or other legal restraint that has the effect of enjoining, restraining, preventing or prohibiting the consummation of the Contribution or Redemption. These conditions to the closing may not be fulfilled and, accordingly, the Split-Off may not be completed. If the Split-Off is not completed, then the Merger will not be completed. In addition, the Reorganization Agreement may be terminated and the Split-Off may be abandoned, at any time prior to the Split-Off Effective Time, (a) by Liberty Media for any reason if the Merger Agreement has been terminated in accordance with its terms or (b) by written agreement of Liberty Media, New Sirius and Sirius XM Holdings (through the Special Committee), if the Merger Agreement has not been terminated in accordance with its terms.

The Merger is subject to a number of closing conditions and, if these conditions are not satisfied or waived (if permissible under the Merger Agreement), the Merger Agreement may be terminated in accordance with its terms and the Merger may not be completed. In addition, the parties have the right to terminate the Merger Agreement under other specified circumstances, in which case the Transactions would not be completed.

The Merger is subject to a number of closing conditions and, if these conditions are not satisfied or waived (if permissible under the Merger Agreement), the Merger will not be completed. These conditions include, among others: (1) receipt of Liberty Split-Off Stockholder Approval; (2) satisfaction, or, if permissible, waiver, of the conditions set forth in the Reorganization Agreement; (3) the absence of any law, order or other legal restraint that has the effect of enjoining, restraining, preventing or prohibiting the consummation of the Transactions; (4) receipt of approval of the Transactions and the Conversion under the Communications Act; (5) the receipt of approval of Nasdaq for listing of all shares of New Sirius Common Stock, subject to official notice of issuance; and (6) the effectiveness of the registration statement of which this proxy statement/notice/prospectus/information statement forms a part. In addition, the obligations of Liberty Media and New Sirius, on the one hand, and Sirius XM Holdings, on the other hand, to complete the Merger are subject to, among other things, the truthfulness and correctness of the other’s representations and warranties in the Merger Agreement (subject in most cases to “materiality” and “material adverse effect” qualifications), the receipt by the parties of certain tax opinions regarding the U.S. federal income tax consequences of the Transactions, and the other’s performance in all material respects of its covenants and agreements in the Merger Agreement. See the section entitled “Transaction Agreements — Merger Agreement — Conditions to Completion of the Merger” for further information regarding closing conditions to the Merger.

These conditions to the closing of the Merger may not be fulfilled and, accordingly, the Merger may not be completed. In addition, if the Merger is not completed by the Walk-Away Date, Liberty Media or Sirius XM Holdings may choose not to proceed with the Merger (subject to certain exceptions). Moreover, Liberty Media, on the one hand, and Sirius XM Holdings (through the Special Committee), on the other hand, can mutually decide to terminate the Merger Agreement at any time prior to the Split-Off Effective Time. In addition, each of Liberty Media and Sirius XM Holdings (through the Special Committee) may elect to terminate the Merger Agreement in certain other circumstances, as described in the section entitled

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“Transaction Agreements — Merger Agreement — Termination.” If the Merger Agreement is terminated, Liberty Media, New Sirius and Sirius XM Holdings may incur substantial fees in connection with termination of the Merger Agreement and none of them will realize the anticipated benefits of the Merger. For a description of the circumstances under which a termination fee is payable, see the section entitled “Transaction Agreements — Merger Agreement — Termination Fee.”

Failure to complete the Split-Off and the Merger could negatively impact the business and/or financial results of Liberty Media and/or Sirius XM Holdings and cause the stock price of Sirius XM Holdings and/or Liberty SiriusXM Common Stock to decline, perhaps significantly.

If the Transactions are not completed for any reason, the ongoing businesses of Liberty Media and/or Sirius XM Holdings may be adversely affected and Liberty Media and Sirius XM Holdings will be subject to several risks and consequences, including the following:

•

Liberty Media may be required, under certain circumstances, to pay Sirius XM Holdings a termination fee of $450 million in cash. See the section entitled “Transaction Agreements — Merger Agreement — Termination Fee” for a description of the circumstances under which a termination fee is payable;

•

Liberty Media and/or Sirius XM Holdings will be required to pay certain costs relating to the Transactions, whether or not the Transactions are completed, such as significant fees and expenses relating to financial advisory, legal, accounting, consulting and other advisory fees and expenses, employee-benefit and related expenses, regulatory filings and filing and printing fees; and

•

matters relating to the Transactions may require substantial commitments of time and resources by Liberty Media management and Sirius XM Holdings management and the expenditure of significant funds in the form of fees and expenses, which could otherwise have been devoted to day-to-day operations and other opportunities that may have been beneficial to Liberty Media and Sirius XM Holdings as separate companies, as the case may be.

In addition, if the Transactions are not completed, Liberty Media and/or Sirius XM Holdings may experience negative reactions from the financial markets and from their respective employees, commercial partners and customers. Liberty Media and/or Sirius XM Holdings could also be subject to litigation, including litigation related to failure to complete the Merger or to enforce their respective obligations under the Merger Agreement. If the Merger is not consummated, there can be no assurance that the risks described above will not materially affect the business, financial results and stock prices of Liberty Media and/or Sirius XM Holdings. The stock price of Sirius XM Holdings or Liberty SiriusXM Common Stock may decline, perhaps significantly, to the extent such stock price reflects a market assumption that the Transactions will be completed, or based on the market’s perception as to why the Transactions were not completed.

The Merger Agreement contains provisions that could discourage a potential competing acquiror of Liberty Media (

	Required Vote					122
	Written Stockholder Consent					122
	Recommendation					122
	ADJOURNMENT PROPOSAL					123
	Required Vote					123
	Recommendation					123
	THE SIRIUS XM STOCKHOLDER WRITTEN CONSENTS					124
	THE MERGER					125
	Effect of the Merger					125
	Exchange of Shares of Sirius XM Common Stock					126
	Treatment of Outstanding Equity Awards					126
	New Sirius’ Board of Directors and Management after the Merger					126
	Amount and Source of Funds and Financing; Expenses					127
	Accounting Treatment					128
	No Appraisal Rights					128
	Results of the Split-Off and the Merger					128
	Regulatory Approvals					129
	Stock Exchange Listing					129
	Stock Transfer Agent and Registrar					129
	Federal Securities Law Consequences					129
	Board Approvals					130
	Written Stockholder Consents and Member Consent					130
	TRANSACTION AGREEMENTS					132
	Reorganization Agreement					132
	Tax Sharing Agreement					139
	Merger Agreement					145
	Voting Agreement					165
	DESCRIPTION OF BUSINESS OF NEW SIRIUS					167
	Overview					167
	Our Sirius XM Business					168
	Our Pandora and Off-platform Business					172
	Competition					174
	Government Regulation					175
	Copyrights to Programming					176
	Human Capital Resources					178
	Properties					180
	Legal Proceedings					181
	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS OF NEW SIRIUS					183
	MANAGEMENT OF NEW SIRIUS FOLLOWING THE MERGER					215
	Directors					215
	Executive Officers					220
	Director Independence					221
	Board Committees					222
	Board Composition					222

	Compensation Committee Interlocks and Insider Participation					222
	EXECUTIVE COMPENSATION OF NEW SIRIUS FOLLOWING THE MERGER					223
	Executive Officers of New Sirius Following the Merger					223
	Directors of New Sirius Following the Merger					223
	Equity Incentive Plans					223
	Equity Compensation Plan Information					224
	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT					226
	Security Ownership of Certain Beneficial Owners of Liberty Media					226
	Security Ownership of Management of Liberty Media					231
	Security Ownership of Certain Beneficial Owners of Sirius XM Holdings					237
	Security Ownership of Management of Sirius XM Holdings					238
	Pro Forma Security Ownership of Certain Beneficial Owners of New Sirius					240
	Pro Forma Security Ownership of Management of New Sirius					242
	CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS					245
	Relationships Between Sirius XM Holdings and Liberty Media					245
	Relationships Between New Sirius and Liberty Media Following the Transactions					246
	DESCRIPTION OF NEW SIRIUS CAPITAL STOCK AND COMPARISON OF STOCKHOLDER RIGHTS					247
	Comparison of Stockholder Rights					247
	Other Provisions of New Sirius’ Amended and Restated Charter and Amended and Restated Bylaws					268
	Federal Securities Law Consequences					270
	U.S. FEDERAL INCOME TAX CONSEQUENCES					271
	DESCRIPTION OF CERTAIN INDEBTEDNESS					277
	ADDITIONAL INFORMATION					279
	Legal Matters					279
	Experts					279
	Householding Information					279
	Stockholder Proposals					280
	Where You Can Find More Information					280
	INDEX TO FINANCIAL STATEMENTS					F-1
	ANNEX A: Reorganization Agreement					A-1
	ANNEX B: First Amendment to the Reorganization Agreement					B-1
	ANNEX C: Form of Tax Sharing Agreement					C-1
	ANNEX D: Agreement and Plan of Merger					D-1
	ANNEX E: First Amendment to the Agreement and Plan of Merger					E-1
	ANNEX F: Voting Agreement					F-1
	ANNEX G: Opinion of Solomon Partners Securities LLC					G-1
	ANNEX H: Form of New Sirius’ Amended and Restated Charter					H-1
	ANNEX I: Form of New Sirius’ Amended and Restated Bylaws					I-1
	ANNEX J: December 2023 Sirius XM Stockholder Written Consent					J-1
	ANNEX K: Marked Amended and Restated Certificate of Incorporation of Sirius XM Radio					K-1
	ANNEX L: June 2024 Sirius XM Stockholder Written Consent					L-1