UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 12, 2023 (December 11, 2023)

SIRIUS XM HOLDINGS INC.

(Exact Name of Registrant as Specified in Charter)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

On December 12, 2023, Sirius XM Holdings Inc. (“SiriusXM”) and Liberty Media Corporation (“Liberty Media”) issued a joint press release announcing the execution of (i) a Reorganization Agreement, dated December 11, 2023, by and among Liberty Media, SiriusXM and Liberty Sirius XM Holdings Inc., a Delaware corporation and a wholly owned subsidiary of Liberty Media (“SplitCo”), pursuant to which, upon the terms and subject to the conditions set forth therein, Liberty Media will cause SplitCo to be split-off from Liberty Media, and (ii) an Agreement and Plan of Merger, dated December 11, 2023, by and among Liberty Media, SiriusXM, SplitCo and Radio Merger Sub, LLC, a Delaware limited liability company and a wholly owned subsidiary of SplitCo (“Merger Sub”), pursuant to which, upon the terms and subject to the conditions set forth therein, Merger Sub will merge with and into SiriusXM, with SiriusXM surviving as a wholly owned subsidiary of SplitCo (clauses (i) and (ii), collectively, the “Proposed Transactions”). A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

SiriusXM provided supplemental information regarding the Proposed Transactions in connection with a presentation to analysts and investors. A copy of that presentation is attached as Exhibit 99.2 to this report and incorporated by reference herein.

* * *

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K includes certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including certain statements relating to the completion of the proposed transaction, proposed trading of SplitCo common stock and other matters related to such proposed transaction. All statements other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws. These forward-looking statements generally can be identified by phrases such as “possible,” “potential,” “intends” or “expects” or other words or phrases of similar import or future or conditional verbs such as “will,” “may,” “might,” “should,” “would,” “could,” or similar variations. These forward-looking statements involve many risks and uncertainties that could cause actual results and the timing of events to differ materially from those expressed or implied by such statements, including, but not limited to: historical financial information may not be representative of future results; there may be significant transaction costs and integration costs in connection with the proposed transaction (including significant tax liability); the parties may not realize the potential benefits of the proposed transaction in the near term or at all; an active trading market for SplitCo common stock may not develop; the uncertainty of the market value of the SplitCo common stock; the satisfaction of all conditions to the proposed transaction; the proposed transaction may not be consummated; Liberty Media and SiriusXM may need to use resources that are needed in other parts of its business to do so; there may be liabilities that are not known, probable or estimable at this time; the proposed transaction may result in the diversion of management’s time and attention to issues relating to the proposed transaction and integration; unfavorable outcome of legal proceedings that may be instituted against Liberty Media and/or SiriusXM following the announcement of the proposed transaction; risks related to disruption of management time from ongoing business operations due to the proposed transaction; risks inherent to the business may result in additional strategic and operational risks, which may impact Liberty Media, SplitCo and/or SiriusXM’s risk profiles, which each company

may not be able to mitigate effectively; and other risks and uncertainties detailed in periodic reports that Liberty Media and SiriusXM file with the Securities and Exchange Commission (“SEC”). These forward-looking statements speak only as of the date of this Current Report on Form 8-K, and Liberty Media and SiriusXM expressly disclaim any obligation or undertaking to disseminate any updates or revisions to any forward-looking statement contained herein to reflect any change in Liberty Media’s or SiriusXM’s expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based. Please refer to the publicly filed documents of Liberty Media and SiriusXM, including their most recent Forms 10-K and 10-Q, as such risk factors may be amended, supplemented or superseded from time to time by other reports Liberty Media or SiriusXM subsequently file with the SEC, for additional information about Liberty Media and SiriusXM and about the risks and uncertainties related to Liberty Media’s and SiriusXM’s businesses which may affect the statements made in this Current Report on Form 8-K.

Additional Information

Nothing in this Current Report on Form 8-K shall constitute a solicitation to buy or an offer to sell shares of common stock of Liberty Media, SiriusXM or SplitCo. The proposed offer and issuance of shares of SplitCo common stock in the proposed transactions will be made only pursuant to an effective registration statement on Form S-4, including a proxy statement of Liberty Media, prospectus of SplitCo, and information statement of SiriusXM. LIBERTY MEDIA AND SIRIUSXM STOCKHOLDERS AND OTHER INVESTORS ARE URGED TO READ THE REGISTRATION STATEMENT WHEN IT IS AVAILABLE, TOGETHER WITH ALL RELEVANT SEC FILINGS REGARDING THE PROPOSED TRANSACTION, AND ANY OTHER RELEVANT DOCUMENTS FILED AS EXHIBITS THEREWITH, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. After the registration statement is declared effective, the proxy statement/prospectus/information statement and other relevant materials for the proposed transaction will be mailed to all Liberty Media and SiriusXM stockholders. Copies of these SEC filings will be available, free of charge, at the SEC’s website (http://www.sec.gov). Copies of the filings together with the materials incorporated by reference therein will also be available, without charge, by directing a request to Liberty Media Corporation, 12300 Liberty Boulevard, Englewood, Colorado 80112, Attention: Investor Relations, Telephone: (877) 772-1518 or Sirius XM Holdings Inc., 1221 Avenue of the Americas, 35th Floor, New York, New York 10021, Attention: Investor Relations, (212) 584-5100.

Participants in a Solicitation

SiriusXM anticipates that the following individuals will be participants (the “SiriusXM Participants”) in the solicitation of proxies from holders of Liberty Media’s LSXMA and LSXMB common stock in connection with the proposed transaction Gregory B. Maffei, Chairman of the SiriusXM Board of Directors, David A. Blau, Eddy W. Hartenstein, Robin P. Hickenlooper, James P. Holden, Evan D. Malone, James E. Meyer, Jonelle Procope, Michael Rapino, Kristina M. Salen, Carl E. Vogel and David Zaslav, all of whom are members of SiriusXM’s Board of Directors, Jennifer Witz, SiriusXM’s Chief Executive Officer and Director and Thomas D. Barry, SiriusXM’s Chief Financial Officer. Information regarding the SiriusXM Participants, including a description of their direct or indirect interests, by security holdings or otherwise, can be found under the caption “Stock Ownership” contained in Sirius XM’s definitive proxy statement for its 2023

annual meeting of stockholders (the “2023 Proxy Statement”), which was filed with the SEC on April 21, 2023 and is available at: https://www.sec.gov/ix?doc=/Archives/edgar/data/908937/000093041323001281/c105679_def14a-ixbrl.htm. To the extent that certain SiriusXM Participants or their affiliates have acquired or disposed of security holdings since the “as of” date disclosed in the 2023 Proxy Statement, such transactions have been or will be reflected on Statements of Change in Ownership on Form 4, which are available at: https://www.sec.gov/edgar/browse/?CIK=908937&owner=exclude. Additional information regarding certain of the SiriusXM Participants in the proxy solicitation and a description of their interests will be contained in the information statement and other relevant materials to be filed with the SEC in respect of the contemplated transactions when they become available. These documents can be obtained free of charge from the sources indicated above.

Liberty Media anticipates that the following individuals will be participants (the “Liberty Media Participants”) in the solicitation of proxies from holders of Liberty Media’s LSXMA and LSXMB common stock in connection with the proposed transaction: John C. Malone, Chairman of the Liberty Media Board of Directors, Robert R. Bennett, Derek Chang, Brian M. Deevy, M. Ian G. Gilchrist, Evan D. Malone, Larry E. Romrell, and Andrea L. Wong, all of whom are members of the Liberty Media Board of Directors, Gregory B. Maffei, Liberty Media’s President, Chief Executive Officer and Director, and Brian J. Wendling, Liberty Media’s Chief Accounting Officer and Principal Financial Officer. Information regarding the Liberty Media Participants, including a description of their direct or indirect interests, by security holdings or otherwise, can be found under the caption “Security Ownership of Certain Beneficial Owners and Management—Pro Forma Security Ownership of Management of Liberty Media Following the Reclassification” contained in Liberty Media’s registration statement on Form S-4 (the “S-4”), which was filed with the SEC on June 8, 2023 and is available at: https://www.sec.gov/Archives/edgar/data/1560385/000110465923069028/tm2232384-33_s4a.htm. To the extent that certain Liberty Media Participants or their affiliates have acquired or disposed of security holdings since the “as of” date disclosed in the S-4, such transactions have been or will be reflected on Statements of Change in Ownership on Form 4 or amendments to beneficial ownership reports on Schedules 13D filed with the SEC, which are available at: https://www.sec.gov/edgar/browse/?CIK=1560385&owner=exclude. Additional information regarding the Liberty Media Participants in the proxy solicitation and a description of their interests will be contained in the proxy statement for Liberty Media’s special meeting of stockholders and other relevant materials to be filed with the SEC in respect of the contemplated transactions when they become available. These documents can be obtained free of charge from the sources indicated above.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated: December 12, 2023