[Form 4] ATI INC Insider Trading Activity

Rhea-AI Filing Summary

ATI Inc. filed a Form 4 disclosing an insider stock sale by senior vice president and chief digital and information officer Timothy J. Harris. On 11/18/2025, Harris sold 10,542 shares of ATI common stock at a price of $97.77 per share in a transaction coded "S," which indicates a sale.

After this transaction, Harris beneficially owns 108,852 shares of ATI common stock in direct ownership. The filing notes that the shares were sold pursuant to a Rule 10b5-1 trading plan dated August 6, 2025, which is a pre-arranged plan for buying or selling company 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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Harris Timothy J

(Last) (First) (Middle)

C/O ATI INC.

2021 MCKINNEY AVE., 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)
	Senior VP and CDIO

3. Date of Earliest Transaction (Month/Day/Year)
11/18/2025

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	11/18/2025		S		10,542(1)	D	$97.77	108,852	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 Plan dated August 6, 2025.

	/s/ Amanda J. Skov, Attorney-in-Fact for Timothy J. Harris	11/20/2025
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

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

ATI reported that senior VP and CDIO Timothy J. Harris sold 10,542 shares of ATI common stock in a transaction dated 11/18/2025.

At what price were the ATI shares sold in Timothy J. Harris’s Form 4 filing?

The Form 4 shows that 10,542 shares of ATI common stock were sold at a price of $97.77 per share.

How many ATI (ATI) shares does Timothy J. Harris own after this transaction?

Following the reported sale, Timothy J. Harris beneficially owns 108,852 shares of ATI common stock in direct ownership.

What is the relationship of Timothy J. Harris to ATI (ATI)?

Timothy J. Harris is an officer of ATI, serving as Senior VP and Chief Digital and Information Officer (CDIO).

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

Yes. The filing states that the 10,542 shares were sold pursuant to a Rule 10b5-1 plan dated August 6, 2025.

Is this ATI Form 4 filed for one or multiple reporting persons?

The Form 4 indicates it is filed by one reporting person, which is Timothy J. Harris.