ROBERT S. WETHERBEE - 03 Jun 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: 03 Jun 2025
Transactions value $: -$4,082,000
Form type: 4
Filing time: 05 Jun 2025, 19:12:37 UTC
Previous filing: 22 May 2025
Next filing: 16 Jun 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	05 Jun 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	-$4.08M	-50K	-10.95%	$81.64	407K	03 Jun 2025	Direct	F1, F2

* 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 December 12, 2025, entered into for personal tax and estate planning purposes.
F2	The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.10 to $82.04, 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.

Content

Shares sold pursuant to a 10b5-1 Trading Plan dated December 12, 2025, entered into for personal tax and estate planning purposes.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.10 to $82.04, 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.