X0508 4 2024-05-21 0 0001018963 ATI INC ATI 0001229771 BALL M LEROY C/O ATI INC. 2021 MCKINNEY AVE., SUITE 1100 DALLAS TX 75201 1 0 0 0 0 Common Stock, par value $0.10 per share 2024-05-21 4 A 0 2054 0.00 A 33192 D Common Stock, par value $0.10 per share 2024-05-21 4 G 0 480 0.00 D 32712 D Annual award of restricted stock granted under the Issuer's 2022 Incentive Plan as part of the Issuer's Director compensation program. The award vests on the first anniversary of the grant date. Annual award granted under the Issuer's 2022 Incentive Plan as part of the Issuer's Director compensation program. Shares donated to one or more charitable organizations as a bone fide gift. /s/ Amanda J. Skov, Attorney-in-Fact for Leroy M. Ball, Jr. 2024-05-23