X0306 4 2021-08-01 0 0001600438 GMS Inc. GMS 0001674921 Apolinsky Craig D GMS INC. 100 CRESCENT CENTRE PARKWAY, SUITE 800 TUCKER GA 30084 0 1 0 0 VP, GC and Corporate Secretary Common Stock 2021-08-01 4 M 0 3255 A 21012 D Common Stock 2021-08-01 4 F 0 1339 49.13 D 19673 D Common Stock 2021-08-01 4 M 0 4147 A 23820 D Common Stock 2021-08-01 4 F 0 1249 49.13 D 22571 D Common Stock 2021-08-01 4 M 0 3735 A 26306 D Common Stock 2021-08-01 4 F 0 1125 49.13 D 25181 D Restricted Stock Units 2021-08-01 4 M 0 3255 0 D Common Stock 3255 0 D Restricted Stock Units 2021-08-01 4 M 0 4147 0 D Common Stock 4147 4147 D Restricted Stock Units 2021-08-01 4 M 0 3735 0 D Common Stock 3735 7468 D Restricted Stock Units 2021-08-01 4 A 0 5597 0 A Common Stock 5597 5597 D Stock Option (Right to Buy) 49.13 2021-08-01 4 A 0 13586 0 A 2031-08-01 Common Stock 13586 13586 D Restricted stock units vested and converted into common stock on a one-for-one basis Includes 748 shares acquired by the Reporting Person on June 30, 2021 pursuant to the GMS Inc. Employee Stock Purchase Plan. On August 1, 2018, the reporting person was granted 9,765 restricted stock units that vested in three equal annual installments beginning on the first anniversary of the grant date. On August 1, 2019, the reporting person was granted 12,442 restricted stock units that vest in three equal annual installments beginning on the first anniversary of the grant date. On August 1, 2020, the reporting person was granted 11,203 restricted stock units that vest in three equal annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock. Subject to the reporting person's continued employment with the issuer through the applicable vesting date, these restricted stock units are scheduled to vest in equal installments on each of August 1, 2022, August 1, 2023 and August 1, 2024 and will be settled, with respect to vested restricted stock units, in shares of the issuer's common stock no later than 30 days after each applicable vesting date. Subject to the reporting person's continued employment with the issuer through the applicable vesting date, these options are scheduled to vest in equal installments on each of August 1, 2022, August 1, 2023 and August 1, 2024. /s/ Craig D. Apolinsky 2021-08-03