ATI Inc (ATI) executive chairman discloses December 10b5-1 stock sales

Rhea-AI Filing Summary

ATI Inc executive chairman and director Robert S. Wetherbee reported open-market sales of company common stock on 12/18/2025. The Form 4 shows three transactions coded as sales, involving 6,507, 47,355 and 6,158 shares of common stock, each at weighted average prices of $108.86, $109.57 and $110.34, respectively.

The filing states these shares were sold under a Rule 10b5-1 trading plan dated August 15, 2025, established for personal tax and estate planning purposes. After the reported transactions, Wetherbee beneficially owns 126,518.3409 shares of ATI common stock directly.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

WETHERBEE ROBERT S

(Last) (First) (Middle)

2021 MCKINNEY AVENUE

SUITE 1100

(Street)

DALLAS TX 75201

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ATI INC [ ATI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chairman

3. Date of Earliest Transaction (Month/Day/Year)
12/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.10 per share	12/18/2025		S		6,507(1)	D	$108.86(2)	180,031.3409	D
Common Stock, par value $0.10 per share	12/18/2025		S		47,355(1)	D	$109.57(3)	132,676.3409	D
Common Stock, par value $0.10 per share	12/18/2025		S		6,158(1)	A	$110.34(4)	126,518.3409	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares sold pursuant to a 10b5-1 Trading Plan dated August 15, 2025, entered into for personal tax and estate planning purposes.

2. 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.

3. 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.

4. 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.

	/s/ Amanda J. Skov, Attorney-in-Fact for Robert S. Wetherbee	12/19/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider stock activity did ATI (ATI) report in this Form 4?

The Form 4 reports that Robert S. Wetherbee, ATI Inc's executive chairman and director, sold shares of ATI common stock in three open-market transactions on 12/18/2025.

How many ATI (ATI) shares did Robert S. Wetherbee sell?

Robert S. Wetherbee reported sales of 6,507, 47,355 and 6,158 shares of ATI common stock, as shown in Table I of the Form 4.

At what prices were the ATI (ATI) shares sold?

The reported weighted average sale prices were $108.86, $109.57 and $110.34, with each trade executed in multiple transactions within disclosed price ranges around those averages.

Was the ATI (ATI) insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states the shares were sold pursuant to a 10b5-1 Trading Plan dated August 15, 2025, entered into for personal tax and estate planning purposes.

How many ATI (ATI) shares does Robert S. Wetherbee own after these transactions?

Following the reported sales, Robert S. Wetherbee beneficially owns 126,518.3409 shares of ATI common stock, held directly.

What is Robert S. Wetherbee’s role at ATI (ATI)?

He is listed as both a director and an officer, serving as Executive Chairman of ATI Inc.