Unregistered Sales of Equity Securities and Use of Proceeds
−Removed: Set forth below is information regarding the Company’s stock repurchases during the period covered by this report, comprised of shares repurchased by ATI under the $700 million Share Repurchase Program authorized by the Company’s Board of Directors in September 2024 and shares repurchased by ATI from employees to satisfy employee-owed taxes on share-based compensation.
−Removed: In February 2026, the Company announced a Share Repurchase Program, authorizing an additional $500 million in combination with $120 million, which was remaining from its prior authorization at the time of announcement.
+Added: Set forth below is information regarding the Company’s stock repurchases during the period covered by this report, comprised of shares repurchased by ATI under the $700 million Share Repurchase Program authorized by the Company’s Board of Directors in September 2024, shares repurchased by ATI under the additional $500 million in repurchase authority announced in February 2026, and shares repurchased by ATI from employees to satisfy employee-owed taxes on share-based compensation.
The Company’s current Stock Repurchase Program has no time limit, does not obligate the Company to repurchase any specific number of shares, and may be modified, suspended, or terminated at any time by the Board of Directors without prior notice.
1 unchanged sentence
Average Price Paid per Share (or Unit) (b) (c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
−Removed: December 29, 2025 - February 1, 2026
−Removed: 665,297 $ 120.99 — $ 620,000,228
−Removed: February 2, 2026 - March 1, 2026
−Removed: 156,795 $ 159.46 156,795 $ 590,000,669
−Removed: March 2, 2026 - March 29, 2026
−Removed: 322,371 $ 156.92 318,392 $ 545,001,514
+Added: March 30, 2026 - May 3, 2026 1,915 $ 147.25 — $ 545,001,514
+Added: May 4, 2026 - May 31, 2026 315,054 $ 159.53 313,442 $ 495,001,566
+Added: June 1, 2026 - June 28, 2026 437 $ 202.66 — $ 495,001,566
Total 317,406 $ 159.52 313,442 $ 495,001,566
3 unchanged sentences
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.