Statement of Changes in Beneficial Ownership (Form 4)

Ownership Submission

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Busch Tina Killough 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) SVP, CHRO (Last) (First) (Middle) C/O ATI INC., 2021 MCKINNEY AVE., SUITE 1100 3. Date of Earliest Transaction (Month/Day/Year) 01/03/2025 (Street) DALLAS, TX 75201 4. If Amendment, Date 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 (City) (State) (Zip) 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 01/03/2025 A 4,444(1) A $ 0 (2) 25,997 D Common Stock, par value $0.10 per share 01/03/2025 F 1,811(3) D $55.81(4) 24,186 D Common Stock, par value $0.10 per share 01/06/2025 F 1,246(5) D $56.63(6) 22,940 D Common Stock, par value $0.10 per share 01/06/2025 A 21,360(7) A $ 0 44,300 D Common Stock, par value $0.10 per share 01/06/2025 F 8,406(8) D $56.63(6) 35,894 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
Director	10% Owner	Officer	Other
Busch Tina Killough C/O ATI INC. 2021 MCKINNEY AVE., SUITE 1100 DALLAS, TX 75201			SVP, CHRO

Signatures

/s/ Amanda J. Skov, Attorney-in-Fact for Tina K. Busch	01/07/2025
**Signature of Reporting Person	Date

Explanation of Responses:

*	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).
(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 payment of taxes on restricted stock units awarded in 2023 and 2024. One third of each such award vested by the terms thereof on January 3, 2025.
(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 ("NYSE") on January 3, 2025
(5)	Shares withheld for the payment of taxes on restricted stock units awarded in 2022. On third of such award vested by its terms on January 6, 2025.
(6)	Represents the average of the high and low trading prices for one share of the Issuer's stock on the NYSE on January 6, 2025.
(7)	Settlement of performance-vested restricted stock units that were granted in 2022, the vesting of which was contingent upon the Issuer's total shareholder return relative to a specified peer group during the period from January 1, 2022 through December 31, 2024 (the "2022-2024 PSUs"). The shares underlying the 2022-2024 PSUs became payable as of January 6, 2025 following certification of the Issuer's achievement of the relevant performance criteria by the Compensation and Leadership Development Committee of the Issuer's Board of Directors.
(8)	Shares withheld for the payment of taxes in connection with the settlement of the 2022-2024 PSUs.

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