1 unchanged sentence
Rule 10b5-1 Plan Elections
−Removed: During the fiscal quarter ended March 29, 2026, Kimberly A.
−Removed: Fields , the Company’s President and Chief Executive Officer , entered into a pre-arranged stock trading plan on February 5, 2026 , which provides for the potential sale of up to 227,022 shares of the Company’s common stock between May 11, 2026 and January 27, 2027 for her personal tax and estate planning purposes.
−Removed: This trading plan was entered into during an open insider trading window and is intended to satisfy the affirmative defense criteria articulated by Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended, as well as the Company’s policies and procedures pertaining to transactions in Company securities .
+Added: During the fiscal quarter ended June 28, 2026, none of the Company's directors or officers, as defined in Section 16 of the Securities Exchange Act of 1934 (the Exchange Act), adopted or terminated any "Rule 10b5-1 trading arrangements," as such term is defined in Item 408(c) of Regulation S-K under the Exchange Act.
+Added: 10.1 T hird Supplemental Indenture, dated June 8 , 2026, between ATI Inc.
+Added: and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 1.1 to the Company's Current Report on Form 8-K filed June 8, 2026).
+Added: 10.2 F orm of 5.875% Senior Note due 2033 (included in and incorporated by reference to Exhibit 1.1 to the Company's Current Report on Form 8-K filed on June 8, 2026).
31.1 Certification of Chief Executive Officer required by Securities and Exchange Commission Rule 13a – 14(a) or 15d – 14(a) (filed herewith).
10 unchanged sentences
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
−Removed: April 30, 2026 By /s/ James Robert Foster
+Added: August 6, 2026 By /s/ James Robert Foster
James Robert Foster
1 unchanged sentence
(Principal Financial Officer)
−Removed: April 30, 2026 By /s/ Michael B.
+Added: August 6, 2026 By /s/ Michael B.
Vice President, Controller and Chief Accounting Officer
1 unchanged sentence
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.