Form 4 Filing for ATI INC.

This Form 4 filing details a transaction by David P. Hess, a director at ATI INC. On May 19, 2026, Mr. Hess was granted an annual award of 905 restricted shares of common stock, par value $0.10 per share, under the Issuer's 2022 Incentive Plan as part of the director compensation program. This award vests on the first anniversary of the grant date. The transaction code is "A" for acquisition, with a price per share of $0.0. Following this transaction, Mr. Hess owns 34,945 shares of ATI INC. common stock directly.