X0306 4 2022-04-06 0 0001136294 Williams Industrial Services Group Inc. WLMS 0001200633 LAY RANDALL R C/O WILLIAMS INDUSTRIAL SRVS GRP INC. 200 ASHFORD CENTER NORTH STE 425 ATLANTA GA 30338 0 1 0 0 EVP, Chief Operating Officer Common Stock, $0.01 par value per share 2022-04-06 4 F 0 14400 1.92 D 142101 D Restricted Stock Units Common Stock 21902 21902 D Restricted Stock Units Common Stock 36343 36343 D Restricted Stock Units Common Stock 56000 56000 D On March 31, 2020, the reporting person was granted 65,704 time-based restricted stock units ("RSUs"), each of which represents a contingent right to receive one share of the issuer's common stock and which vest in three equal installments on March 31 of each of 2021, 2022 and 2023, subject to continued employment through the vesting date. The RSUs may be settled in shares of the issuer's common stock or cash (at the election of the issuer). On March 31, 2021, the reporting person was granted 36,343 time-based RSUs, each of which represents a contingent right to receive one share of the issuer's common stock and which vest in full on March 31, 2024, subject to continued employment through the vesting date. The RSUs may be settled in shares of the issuer's common stock or cash (at the election of the issuer). On March 31, 2022, the reporting person was granted 56,000 time-based RSUs, each of which represents a contingent right to receive one share of the issuer's common stock and which vest in three equal installments on March 31 of each of 2023, 2024 and 2025, subject to continued employment through the vesting date. The RSUs may be settled in shares of the issuer's common stock or cash (at the election of the issuer). Reflects withholding of shares by the issuer to offset the tax liability resulting from the vesting on March 31, 2022 with respect to time-based RSUs granted on September 30, 2019 and March 31, 2020. /s/ Charles E. Wheelock for Randall R. Lay by Power of Attorney 2022-04-08