Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Liberty Media Corp
  2. Issuer Name and Ticker or Trading Symbol
SIRIUS XM HOLDINGS INC. [SIRI]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
12300 LIBERTY BOULEVARD
3. Date of Earliest Transaction (Month/Day/Year)
03/06/2018
(Street)

ENGLEWOOD, CO 80112
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
2.125% Exch Sr. Debentures Due 2048 (obligation to sell) (1) (2) 03/06/2018   S(1)(2)     $ 400,000,000   (2) 03/31/2048 Common Stock 49,876,880 $ 400,000,000 $ 400,000,000 (1) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Liberty Media Corp
12300 LIBERTY BOULEVARD
ENGLEWOOD, CO 80112
  X   X    

Signatures

 Liberty Media Corporation By: /s/ Craig Troyer, Title: Senior Vice President, Deputy General Counsel and Assistant Secretary   03/13/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) On March 6, 2018, the reporting person sold, pursuant to a purchase agreement, $400,000,000 aggregate principal amount of its 2.125% exchangeable senior debentures due 2048 (the "Debentures") in a private sale pursuant to Rule 144A. Each $1,000 principal amount of Debentures is initially exchangeable for 124.6922 shares of the issuer's common stock, par value $0.001 per share (the "Common Stock"). Upon exchange at the option of the holder or a purchase of the Debentures pursuant to a holder's put right, the reporting person may elect physical or cash settlement or a combination thereof.
(2) Each Debenture is exchangeable at the option of the holder during specified periods as set forth in the Remarks section. Holders of the Debentures may put them to the reporting person on April 7, 2023, or prior thereto following the occurrence of a "fundamental change," and the Debentures may be redeemed by the reporting person, (i) in whole or in part, on or after April 7, 2023 at any time, or (ii) in whole, but not in part, prior to April 7, 2023, after the occurrence of certain conditions or events.
 
Remarks:
Each Debenture is exchangeable at the option of the holder, subject to certain terms and conditions, during specified periods after: (i) the market value of the underlying Common Stock exceeds 130% of the principal amount of the Debenture; (ii) the trading price of a Debenture is less than 98% of the market value of the underlying Common Stock; (iii) the occurrence of a "fundamental change" or a "make-whole fundamental change" with respect to a significant reference company; (iv) the Debenture is called for redemption; (v) the reporting person elects to transfer its obligations under the Debentures and the indenture governing the Debentures to a "qualified successor entity" and the reporting person does not provide an irrevocable, full and unconditional guarantee of the "qualified succesor entity's" payment obligations thereunder; and (vi) the issuer of the Common Stock declares or makes a dividend or distribution that, pursuant to the terms of the Debentures, would reduce the principal amount of the Debentures to $0.00 or such principal amount is otherwise reduced to $0.00. The Debentures are also exchangeable at any time during the period commencing on January 1, 2023 through the close of business on the second scheduled trading day immediately preceding April 7, 2023, and during the period commencing on January 1, 2048 through the close of business on the second scheduled trading day immediately preceding the maturity date of the Debentures.

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