ATI exec sells 16,500 shares at $207.54

ATI executive Timothy J. Harris sold 16,500 ATI shares under a pre-arranged Rule 10b5-1 plan and now holds 113,687 shares directly.

Rhea-AI Filing Summary

ATI INC (ATI) reported that Senior VP and CDIO Timothy J. Harris sold 16,500 shares of common stock on September 8, 2026 at $207.54 per share in an open-market or private transaction. The sale was made pursuant to a Rule 10b5-1 Trading Plan dated May 21, 2026, entered into for personal tax and estate planning purposes, and Harris now directly holds 113,687 shares of ATI common stock.

Insider Trade Summary 10b5-1

Net Seller: 16,500 shares

Net Sell 1 txn

Insider Harris Timothy J

Role Senior VP and CDIO

Sold 16,500 shs ($3.42M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share F1	16,500	$207.54	$3.42M

Holdings After Transaction: Common Stock, par value $0.10 per share — 113,687 shares (Direct)

Footnotes (1)

1. F1. Shares sold pursuant to a 10b5-1 Trading Plan dated May 21, 2026, entered into for personal tax and estate planning purposes.

Key Figures

Shares sold: 16,500 shares Sale price per share: $207.54 per share Shares held after transaction: 113,687 shares +2 more

5 metrics

Shares sold 16,500 shares Common stock sold by Timothy J. Harris on September 8, 2026

Sale price per share $207.54 per share Price for the 16,500 ATI common shares sold

Shares held after transaction 113,687 shares Direct ATI common stock holdings of Timothy J. Harris after the sale

Number of sell transactions 1 transaction Single reported sale of ATI common stock in this Form 4

Rule 10b5-1 plan date May 21, 2026 Date of trading plan under which the shares were sold

Key Terms

Rule 10b5-1 Trading Plan, Senior VP and CDIO, open market or private transaction, common stock, par value $0.10 per share

4 terms

Rule 10b5-1 Trading Plan regulatory

"Shares sold pursuant to a 10b5-1 Trading Plan dated May 21, 2026"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Senior VP and CDIO other

"Timothy J. Harris is identified as Senior VP and CDIO"

open market or private transaction financial

"Sale in open market or private transaction"

common stock, par value $0.10 per share financial

"Common Stock, par value $0.10 per share"

FAQ

What insider transaction did ATI (ATI) disclose for Timothy J. Harris?

ATI disclosed that Senior VP and CDIO Timothy J. Harris sold 16,500 shares of ATI common stock on September 8, 2026 in an open-market or private transaction at $207.54 per share, under a pre-arranged Rule 10b5-1 trading plan.

How many ATI (ATI) shares does Timothy J. Harris hold after this sale?

After the reported sale, Timothy J. Harris directly holds 113,687 shares of ATI common stock. This share count is stated as his direct ownership following the September 8, 2026 transaction.

Was the ATI (ATI) insider sale by Timothy J. Harris under a Rule 10b5-1 plan?

Yes. The filing states the shares were sold pursuant to a Rule 10b5-1 Trading Plan dated May 21, 2026, which was entered into for personal tax and estate planning purposes.

What price did Timothy J. Harris receive per share in the ATI (ATI) sale?

The transaction reports that Timothy J. Harris sold 16,500 shares of ATI common stock at a price of $207.54 per share on September 8, 2026, described as a sale in an open-market or private transaction.

What is Timothy J. Harris’s role at ATI (ATI) related to this Form 4 filing?

In this filing, Timothy J. Harris is identified as an officer of ATI, serving as Senior VP and CDIO. The reported transaction reflects activity in ATI common stock associated with his direct ownership.

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Available on EDGAR 09/10/2026 - 04:12 PM Accepted by SEC EDGAR 09/10/2026 - 04:12 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 TEXAS 75201

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/08/2026		S(1)		16,500	D	$207.54	113,687	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 Trading Plan dated May 21, 2026, entered into for personal tax and estate planning purposes.

	/s/ Amanda J. Skov, Attorney-in-Fact for Timothy J. Harris	09/10/2026
	** 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).
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.
* Form 4: SEC 1474 (03-26)