ATI (NYSE: ATI) VP Chief Accounting Officer reports RSU grant and tax withholding

Rhea-AI Filing Summary

ATI Inc. executive Michael Benjamin Miller, VP and Chief Accounting Officer, reported equity compensation activity in the company’s common stock. On January 5, 2026, he received an award of 854 restricted stock units, granted at $0 per share, under ATI’s 2022 Incentive Plan. These units settle in shares of stock and vest in three equal annual installments on each of the first three anniversaries of the grant date.

On the same date, 374 shares of common stock were withheld at a price of $121.08 per share to cover taxes on restricted stock units that were originally awarded in 2024 and 2025, with one-third of each such award vesting on January 5, 2026. After these transactions, Miller directly beneficially owned 8,052 shares of ATI common stock.

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)
01/05/2026

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	01/05/2026		A		854(1)	A	$0(2)	8,426	D
Common Stock, par value $0.10 per share	01/05/2026		F		374(3)	D	$121.08(4)	8,052	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. Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date.

2. Awarded under the Issuer's 2022 Incentive Plan.

3. Shares withheld for the payment of taxes on restricted stock units awarded in 2024 and 2025. One-third of each such award vested by the terms thereof on January 5, 2026.

4. Represents the average of the high and low trading prices for one share of the Issuer's Common Stock on the New York Stock Exchange on January 5, 2026.

	/s/ Amanda J. Skov, Attorney-in-Fact for Michael B. Miller	01/07/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider activity did ATI (ATI) disclose for Michael Benjamin Miller?

ATI reported that Michael Benjamin Miller, its VP Chief Accounting Officer, received an equity award of 854 restricted stock units on January 5, 2026 and had 374 shares withheld the same day to cover taxes on previously granted restricted stock units.

How many ATI (ATI) restricted stock units were granted to Michael Benjamin Miller and how do they vest?

Miller was granted 854 restricted stock units that are settled in shares of ATI common stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date.

Under which plan were the new ATI (ATI) restricted stock units for Michael Benjamin Miller awarded?

The 854 restricted stock units reported for Michael Benjamin Miller were awarded under ATI’s 2022 Incentive Plan, as disclosed in the filing.

Why were 374 ATI (ATI) shares withheld from Michael Benjamin Miller on January 5, 2026?

The filing states that 374 shares of ATI common stock were withheld to pay taxes on restricted stock units awarded in 2024 and 2025, after one-third of each such award vested on January 5, 2026.

What price was used for ATI (ATI) shares withheld to cover Michael Benjamin Miller’s taxes?

The 374 shares withheld for tax payments were valued at $121.08 per share, representing the average of the high and low trading prices for ATI common stock on the New York Stock Exchange on January 5, 2026.

How many ATI (ATI) shares does Michael Benjamin Miller own after the reported transactions?

After the grant of restricted stock units and the tax withholding transaction on January 5, 2026, Michael Benjamin Miller beneficially owned 8,052 shares of ATI common stock directly.