Form 4 Filing for ATI Inc.

This filing details a Form 4 filing for ATI Inc., reporting a transaction by BALL M LEROY, a director. On May 19, 2026, 905 shares of Common Stock were acquired under the company's 2022 Incentive Plan as part of the director compensation program. This was an annual award of restricted stock that vests one year after the grant date. The transaction code was "A" for acquisition, with a price per share of $0.00, as noted by footnote F2. Following this transaction, the post-transaction shares owned by BALL M LEROY amount to 34,737. The filing was signed on May 21, 2026, by Amanda J. Skov, as Attorney-in-Fact for Leroy M. Ball, Jr.