Exhibit 99.1

MRC GLOBAL INC. ANNOUNCES SECONDARY PUBLIC OFFERING

OF 17 MILLION SHARES OF COMMON STOCK BY SELLING STOCKHOLDER

HOUSTON, TX – NOVEMBER 5, 2012 – MRC Global Inc. (NYSE:MRC) announced today that PVF Holdings LLC, the company’s majority stockholder, has commenced a registered underwritten public offering of 17 million shares of the company’s common stock. PVF Holdings LLC has granted the underwriters a 30-day option to purchase up to an aggregate of 2.55 million additional shares. The company will not receive any of the proceeds of the offering.

Goldman, Sachs & Co. and Barclays Capital Inc. are serving as joint-bookrunning managers for the offering. BofA Merrill Lynch, Baird and Wells Fargo Securities are serving as lead managers. Stephens Inc., Raymond James, KeyBanc Capital Markets and William Blair are serving as co-managers.

A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission. The offering will be made only by means of a prospectus and related prospectus supplement, copies of which may be obtained from:

Goldman, Sachs & Co.

Attn: Prospectus Department

200 West Street, New York, NY 10282

Telephone: 866-471-2526

Email: prospectus-ny@ny.email.gs.com

Barclays

c/o Broadridge Financial Solutions

1155 Long Island Ave.

Edgewood, NY 11717

Telephone: 888-603-5847

Email: barclaysprospectus@broadridge.com

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any state or jurisdiction.

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