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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1. Name and Address of Reporting Person *   Mario Investments LLC 2. Date of Event Requiring Statement (Month/Day/Year) 06/10/2015 3. Issuer Name and Ticker or Trading Symbol MRC GLOBAL INC. [MRC] (Last) (First) (Middle) C/O DAVIS POLK & WARDWELL LLP, 450 LEXINGTON AVENUE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) NEW YORK, NY 10017 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 5,849 D (4) (7) Â

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
6.5% Series A Convertible Perpetual Preferred Stock	  (3)	  (3)	Common Stock	20,302,009.2	$ 17.88	D (1) (2) (5) (7)	Â
Stock Option (right to buy)	  (6)	  (6)	Common Stock	9,415	$ 24.07	D (6) (7)	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mario Investments LLC C/O DAVIS POLK & WARDWELL LLP 450 LEXINGTON AVENUE NEW YORK, NY 10017	Â	  X	Â	Â
Cornell Capital Special Situations Partners II LP C/O DAVIS POLK AND WARDWELL LLP 450 LEXINGTON AVENUE NEW YORK, NY 10017	Â	  X	Â	Â
Cornell Capital GP II LP C/O DAVIS POLK & WARDWELL LLP 450 LEXINGTON AVENUE NEW YORK, NY 10017	Â	  X	Â	Â
Cornell Investment Partners LLC C/O DAVIS POLK & WARDWELL LLP 450 LEXINGTON AVENUE NEW YORK, NY 10017	Â	  X	Â	Â
Cornell Henry C/O DAVIS POLK & WARDWELL LLP 450 LEXINGTON AVENUE NEW YORK, NY 10017	Â	  X	Â	Â

Signatures

/s/ Joanna Reiss, Attorney-in-fact for Mario Investments LLC		06/19/2015
**Signature of Reporting Person		Date
/s/ Joanna Reiss, Attorney-in-fact for Cornell Capital Special Situations Partners II LP		06/19/2015
**Signature of Reporting Person		Date
/s/ Joanna Reiss, Attorney-in-fact for Cornell Capital GP II LP		06/19/2015
**Signature of Reporting Person		Date
/s/ Joanna Reiss, Attorney-in-fact for Cornell Investment Partners LLC		06/19/2015
**Signature of Reporting Person		Date
/s/ Joanna Reiss, Attorney-in-fact for Henry Cornell		06/19/2015
**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)	This statement is being filed jointly by Mario Investments LLC ("Mario"), Cornell Capital Special Situations Partners II LP ("Cornell Special Situations II"), Cornell Capital GP II LP ("Cornell GP II"), Cornell Investment Partners LLC ("Cornell Investment Partners") and Henry Cornell ("Mr. Cornell" and, together with Mario, Cornell Special Situations II, Cornell GP II and Cornell Investment Partners, the "Reporting Persons"). Mr. Cornell is the sole member of Cornell Investment Partners, which is the general partner of Cornell GP II, which is the general partner of Cornell Special Situations II, which is the sole member of Mario.
(2)	On May 19, 2015, the Issuer entered into a Purchase Agreement (the "Purchase Agreement") with Mario, pursuant to which the Issuer agreed to issue and sell to Mario an aggregate of 363,000 shares of its 6.50% Series A Convertible Perpetual Preferred Stock, par value $0.01 per share (the "Series A Preferred Stock"), for an aggregate purchase price of $363 million, or $1,000 per share, in a privately negotiated transaction. The transactions contemplated by the Purchase Agreement closed on June 10, 2015 (the "Issuance Date"), at which time the Series A Preferred Stock was issued to Mario.
(3)	The Series A Preferred Stock is convertible at the option of Mario at any time after the Issuance Date and, under certain circumstances, as required by the Issuer, into shares of Common Stock at an initial conversion rate of 55.9284 shares of Common Stock for each share of Series A Preferred Stock, which represents an initial conversion price of approximately $17.88 per share of Common Stock, subject to adjustment for stock splits and other similar corporate transactions. The Series A Preferred Stock does not have an expiration date.
(4)	Mr. Cornell is the direct beneficial owner of these shares of Common Stock.
(5)	Mario is the direct beneficial owner of these shares of Series A Preferred Stock. Cornell Special Situations II, Cornell GP II, Cornell Investment Partners and Mr. Cornell are indirect beneficial owners of these shares of Series A Preferred Stock.
(6)	Mr. Cornell is the direct beneficial owner of these stock options. The stock options are fully exercisable, and expire on November 14, 2015, which is 180 days after Mr. Cornell's termination of service as a director of the Issuer.
(7)	Each of the Reporting Persons disclaims beneficial ownership of the securities reported in Table I and Table II except to the extent of its pecuniary interest therein, if any.

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