FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   Isaac Rory M 2. Date of Event Requiring Statement (Month/Day/Year) 04/11/2012 3. Issuer Name and Ticker or Trading Symbol MRC GLOBAL INC. [MRC] (Last) (First) (Middle) 2 HOUSTON CENTER, 909 FANNIN, SUITE 3100 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP - Business Development 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) HOUSTON, TX 77010 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 0 I See Footnotes (1) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	  (3)	12/03/2019	Common Stock	21,853	$ 22.84	D	Â
Stock Option (right to buy)	  (4)	11/10/2021	Common Stock	13,812	$ 18.1	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Isaac Rory M 2 HOUSTON CENTER, 909 FANNIN SUITE 3100 HOUSTON, TX 77010	Â	Â	  EVP - Business Development	Â

Signatures

/s/ Brian K. Shore, Attorney-in-fact		04/11/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	PVF Holdings LLC ("PVF") owns 84,214,026 shares of common stock, par value $0.01 per share ("Common Stock"), of MRC Global Inc. (the "Company"). Mr. Isaac owns 127.3212 common units ("Common Units") of PVF, representing 0.038% of the total outstanding Common Units. Mr. Isaac may be deemed to beneficially own 32,127 shares of Common Stock indirectly through his ownership of such Common Units. Mr. Isaac also owns 381.3098 profits units ("Profits Units") of PVF, representing 8.50% of the total outstanding Profits Units. The Amended and Restated Limited Liability Company Agreement of PVF, dated as of October 31, 2007 (the "LLC Agreement"), Amendment No. 1 to the LLC Agreement, dated as of December 18, 2007, and Amendment No. 2 to the LLC Agreement, dated as of October 31, 2009, are filed as exhibits 10.17, 10.17.1, and 10.17.2 to the Company's Registration Statement on Form S-1, File No. 333-178980.
(2)	Mr. Isaac does not have the power to vote or dispose of the shares of Common Stock that correspond to his ownership of Common Units and thus does not have beneficial ownership of such shares. In addition, Mr. Isaac does not have any pecuniary interest in the shares of Common Stock held by PVF because he does not control PVF and does not have or share investment control over the shares of Common Stock owned by PVF.
(3)	33 1/3% of the options reported above will become exercisable on each of 12/3/2012, 12/3/2013, and 12/3/2014.
(4)	20% of the options reported above will become exercisable on each of 11/10/2012, 11/10/2013, 11/10/2014, 11/10/2015, and 11/10/2016.

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