X0306 4 2021-05-05 0 0001439095 MRC GLOBAL INC. MRC 0001673745 Youngblood Kelly FULBRIGHT TOWER, 1301 MCKINNEY STREET, SUITE 2300 HOUSTON TX 77010 0 1 0 0 See Remarks Common Stock 2021-05-05 4 A 0 27322 0.00 A 222618 D On May 5, 2021, the reporting person received 27,322 Restricted Stock Units (the "May 2021 Grant"). Each Restricted Stock Unit represents a contingent right to receive one share of the issuer's Common Stock. 34% of the May 2021 Grant will vest on May 5, 2022 and 33% of the May 2021 Grant will vest on each of May 5, 2023 and May 5, 2024, each conditioned on the reporting person's continued service with the issuer and subject to accelerated vesting under certain circumstances. Executive Vice President and Chief Financial Officer /s/ Ann D. Garnett, by power of attorney 2021-05-07