X0306 4 2023-01-03 0 0001018963 ATI INC ATI 0001953583 Williams Jimmy Jr. C/O ATI INC. 2021 MCKINNEY AVE., SUITE 1100 DALLAS TX 75201 0 1 0 0 SVP, CTO Common Stock, par value $0.10 per share 2023-01-03 4 A 0 8119 0.00 A 8119 D Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date. Awarded under ATI's 2022 Incentive Plan. /s/ Amanda J. Skov, Attorney-in-Fact for Jimmy Williams, Jr. 2023-01-05