ATI insider Harris sells 10,543 shares under 10b5-1 plan

Rhea-AI Filing Summary

ATI Inc. (ATI) insider transaction: Senior VP and CDIO Timothy J. Harris sold 10,543 shares of common stock on 11/04/2025 at a price of $96.07 per share, reported with transaction code “S”. The filing indicates direct ownership.

The sale was made pursuant to a Rule 10b5-1 trading plan dated August 6, 2025. Following the transaction, Harris beneficially owned 129,937 shares directly.

Insider Trade Summary

Net Seller: 10,543 shares

Net Sell 1 txn

Insider Harris Timothy J

Role Senior VP and CDIO

Sold 10,543 shs ($1.01M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share	10,543	$96.07	$1.01M

Holdings After Transaction: Common Stock, par value $0.10 per share — 129,937 shares (Direct)

Footnotes (1)

1. F1. Shares sold pursuant to a 10b5-1 Plan dated August 6, 2025.

FAQ

What did ATI (ATI) disclose in this Form 4?

An officer, Timothy J. Harris, sold 10,543 shares of ATI common stock on 11/04/2025 at $96.07 per share.

Who is the reporting person and role at ATI (ATI)?

Timothy J. Harris, Senior VP and Chief Digital & Information Officer.

How many ATI (ATI) shares does the insider own after the sale?

Following the transaction, Harris beneficially owned 129,937 shares directly.

Was the ATI (ATI) sale under a 10b5-1 plan?

Yes. The sale was pursuant to a Rule 10b5-1 plan dated August 6, 2025.

What was the transaction code for the ATI (ATI) trade?

Transaction code S, indicating an open-market or private sale.

Was the ownership direct or indirect for ATI (ATI)?

The filing lists direct ownership for both the transaction and post-transaction holdings.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 11/05/2025 - 02:19 PM Learn about SEC filing dates

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)
11/04/2025

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	11/04/2025		S		10,543(1)	D	$96.07	129,937	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	11/05/2025
	** 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.