Director Lund Elizabeth Hefley Acquires 905 Shares of ATI Inc. Common Stock

On May 19, 2026, Director Lund Elizabeth Hefley acquired 905 shares of ATI Inc. common stock, par value $0.10 per share, through an annual award of restricted stock. This award, granted under the Issuer's 2022 Incentive Plan as part of the Director compensation program, vests on the first anniversary of the grant date. The transaction code was 'A' for acquisition, with a transaction price of $0.00 per share, as indicated by footnote F2. Following this transaction, Director Hefley now owns 1536 shares of ATI Inc. common stock. The filing, designated as Form 4, was signed on May 21, 2026, by Amanda J. Skov, Attorney-in-Fact for Elizabeth H. Lund.