ATI Inc (NYSE: ATI) VP has shares withheld to cover RSU taxes

Rhea-AI Filing Summary

ATI Inc's VP and Chief Accounting Officer Michael Benjamin Miller reported a small share disposition tied to restricted stock vesting. On March 2, 2026, 413 shares of common stock were withheld at an average price of $164 per share to cover taxes on restricted stock units granted on March 1, 2024. One‑third of these units vested on March 1, 2026, and Miller now holds 7,639 ATI shares 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).

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^*

Miller Michael Benjamin

(Last) (First) (Middle)

C/O ATI INC.

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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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	03/02/2026		F		413(1)	D	$164(2)	7,639	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 withheld for the payment of taxes on restricted stock units awarded on March 1, 2024. One-third of such restricted stock units vested by their terms on March 1, 2026.

2. Represents the average of the high and low trading prices of one share of the Issuer's Common Stock on the New York Stock Exchange on March 2, 2026.

	/s/ Amanda J. Skov, Attorney-in-Fact for Michael B. Miller	03/03/2026
	** 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 transaction did ATI (ATI) report for Michael Benjamin Miller?

ATI reported that VP and Chief Accounting Officer Michael Benjamin Miller had 413 common shares withheld on March 2, 2026. The shares were used to pay taxes due on restricted stock units that vested, rather than being sold in an open-market transaction.

Was the ATI (ATI) insider transaction an open-market sale of shares?

No, the transaction was not an open-market sale. The 413 ATI shares were withheld to satisfy tax obligations on restricted stock units that vested, which is a common administrative step when equity awards convert into shares for company executives.

At what price were ATI (ATI) shares valued for the insider tax withholding?

The 413 ATI shares were valued at an average price of $164 per share. This price reflects the average of the high and low trading prices of ATI common stock on the New York Stock Exchange on March 2, 2026, as disclosed in the filing.

How many ATI (ATI) shares does Michael Benjamin Miller hold after this transaction?

After the tax-withholding disposition, Michael Benjamin Miller directly holds 7,639 ATI common shares. This figure reflects his remaining stake following the 413 shares withheld to cover taxes on restricted stock units that vested on March 1, 2026.

What equity award triggered the ATI (ATI) insider tax-withholding transaction?

The transaction relates to restricted stock units awarded on March 1, 2024. One-third of those restricted stock units vested on March 1, 2026, and ATI withheld 413 shares from the vesting to pay the associated tax liability on behalf of Michael Benjamin Miller.