Form 4 Filing for ATI INC by Marianne Kah

Marianne Kah, a director at ATI INC, acquired 905 shares of common stock on May 19, 2026, as an annual award under the Issuer's 2022 Incentive Plan. This award is part of the Director compensation program and vests on the first anniversary of the grant date. The acquisition was made at a price of $0.0 per share, with the transaction code "A" indicating an acquisition. Following this transaction, Kah owns 35,075 shares of ATI INC common stock. The filing was signed by Amanda J. Skov as Attorney-in-Fact for Marianne Kah on May 21, 2026.