ATI INC

The information concerning our directors required by this item is incorporated and made part hereof by reference to the material appearing under the heading “Our Corporate Governance” and “Election of Directors” and the information concerning our executive officers required by this item is incorporated and made part hereof by reference to the material appearing under the heading “Members of ATI's Executive Management,” in the ATI Proxy Statement for the 2024 Annual Meeting of Stockholders (the “2024 Proxy Statement”), which will be filed with the Securities and Exchange Commission, pursuant to Regulation 14A, not later than 120 days after the end of the fiscal year. Information concerning the Audit and Risk Committee and its financial expert required by this item is incorporated and made part hereof by reference to the material appearing under the heading “Our Corporate Governance-Board Information- Board Committees” in the 2024 Proxy Statement.

ATI has adopted Corporate Guidelines for Business Conduct and Ethics that apply to all employees including its principal executive officer or principal financial and accounting officer, or persons performing similar functions. The Corporate Guidelines for Business Conduct and Ethics as well as the charters for the Company’s Audit and Risk, Nominating and Governance, Personnel and Compensation, and Technology Committees, as well as periodic and current reports filed with the SEC, are available through the Company’s website at http://www.atimaterials.com and are available in print free of charge to any shareholder upon request. To obtain a copy, contact the Corporate Secretary, ATI Inc., 2021 McKinney Avenue, Dallas, Texas 75201 (telephone: 800-289-7454). The Company intends to post on its website any waiver from or amendment to the guidelines that apply to the Company’s Principal Executive Officer or Principal Financial and Accounting Officer (or persons performing similar functions) that relate to elements of the code of ethics identified by the Securities and Exchange Commission in Item 406(b) of Regulation S-K.