ROBERT S. WETHERBEE - 02 Dec 2025 Form 4 Insider Report for ATI INC (ATI)

Role
Executive Chairman, Director
Signature
/s/ Amanda J. Skov, Attorney-in-Fact for Robert S. Wetherbee
Issuer symbol
ATI
Transactions as of
02 Dec 2025
Transactions value $
-$5,217,566
Form type
4
Filing time
19 Dec 2025, 21:58:46 UTC
Previous filing
20 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
WETHERBEE ROBERT S Executive Chairman, Director 2021 MCKINNEY AVENUE, SUITE 1100, DALLAS /s/ Amanda J. Skov, Attorney-in-Fact for Robert S. Wetherbee 19 Dec 2025 0001572385

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ATI Common Stock, par value $0.10 per share Sale -$708K -6.51K -3.49% $108.86 180K 18 Dec 2025 Direct F1, F2
transaction ATI Common Stock, par value $0.10 per share Sale -$5.19M -47.4K -26.3% $109.57 133K 18 Dec 2025 Direct F1, F3
transaction ATI Common Stock, par value $0.10 per share Sale $679K +6.16K +5.12% $110.34 127K 18 Dec 2025 Direct F1, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 Shares sold pursuant to a 10b5-1 Trading Plan dated August 15, 2025, entered into for personal tax and estate planning purposes.
F2 The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $108.18 to to $109.17. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the U.S. Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares sold at each specific price within the range reported.
F3 The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $109.18 to to $110.17. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.
F4 The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $110.18 to to $110.67. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.