X0206 3 2020-07-01 0 0001439095 MRC GLOBAL INC. MRC 0001816893 McCarthy John P FULBRIGHT TOWER, 1301 MCKINNEY STREET, SUITE 2300 HOUSTON TX 77010 0 1 0 0 SVP-Supply Chain Common Stock 28282 D Stock Option (right to buy) 18.10 2021-11-10 Common Stock 2762 D Stock Option (right to buy) 29.35 2023-03-07 Common Stock 1615 D Stock Option (right to buy) 29.30 2024-02-18 Common Stock 1523 D This number includes 8,227 shares of Common Stock and 20,055 unvested Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of the issuer's Common Stock. 2,176 RSUs will vest on 02/12/2021; 4,940 RSUs will vest in two annual installments-2,469 RSUs will vest on 02/11/2021, and 2,471 RSUs will vest on 02/11/2022; 7,935 RSUs will vest in three annual installments-34% will vest on 02/10/2021, and 33% will vest on each of 02/10/2022 and 02/10/2023; and 5,004 RSUs will vest on 02/10/2023; each conditioned on the reporting person's continued service with the issuer and subject to accelerated vesting under certain circumstances. The Stock Option vested in five equal annual installments beginning on 11/10/2012. The Stock Option vested in four equal annual installments beginning on 03/07/2014. The Stock Option vested in three annual installments as follows: 33% on 02/18/2015, 33% on 02/18/2016, and 34% on 02/18/2017. Exhibit 24 - Power of Attorney Ann D. Garnett, by power of attorney 2020-07-06