Sec Form 3 Filing - Shields Emily K. @ MRC GLOBAL INC. - 2022-06-13

FORM 3 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 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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1. Name and Address of Reporting Person Shields Emily K. 2. Issuer Name and Ticker or Trading Symbol MRC GLOBAL INC. [ MRC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) 1301 MCKINNEY STREET, SUITE 2300 3. Date of Earliest Transaction (MM/DD/YY) 06/13/2022 (Street) HOUSTON, TX77010 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 Common Stock 30,311( 1 ) D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Stock Option (Right to Buy) $ 29.35 ( 2 ) 03/07/2023 Common Stock 1,056 D Stock Option (Right to Buy) $ 29.3 ( 3 ) 02/18/2024 Common Stock 711 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Shields Emily K. 1301 MCKINNEY STREET, SUITE 2300 HOUSTON, TX77010 See Remarks Signatures Ann D. Garnett, by power of attorney 06/23/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This number includes 8,170 shares of Common Stock and 22,141 shares of unvested Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of the issuer's Common Stock. 2,145 RSUs will vest on 2/10/2023; 7,451 RSUs will vest in two annual installments - 3,725 RSUs will vest on 2/8/2023 and 3,726 RSUs will vest on 2/8/2024; 12,545 RSUs will vest in three annual installments - 4,265 will vest on 2/7/2023, 4,139 RSUs will vest on 2/7/2024 and 4,141 RSUs will vest on 2/7/2025; each conditioned on the reporting person's continued service with the issuer and subject to accelerated vesting under certain circumstances. ( 2 )The Stock Option vested in four annual installments of 25% on each of 3/7/2014, 3/7/2015, 3/7/2016 and 3/7/2017. ( 3 )The Stock Option vested in three annual installments as follows: 33% on 2/18/2015, 33% on 2/18/2016 and 34% on 2/18/2017.

Remarks: SVP - Sustainability and Assistant General CounselExhibit 24 - Power of Attorney

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