ATI officer sells 16,500 shares at $193.06

ATI’s Senior VP and CDIO reported a planned sale of 16,500 ATI shares under a Rule 10b5-1 trading plan, retaining 97,187 shares afterward.

Rhea-AI Filing Summary

ATI INC (ATI) reported that Senior VP and Chief Digital and Information Officer Timothy J. Harris sold 16,500 shares of common stock on September 14, 2026 at $193.06 per share in an open-market transaction. After this sale, he continues to hold 97,187 shares of ATI common stock directly. The sale was executed under a Rule 10b5-1 Trading Plan dated May 21, 2026, which the footnote states was adopted for personal tax and estate planning purposes.

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 ($3.19M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share F1	16,500	$193.06	$3.19M

Holdings After Transaction: Common Stock, par value $0.10 per share — 97,187 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: $193.06 per share Shares owned after transaction: 97,187 shares +2 more

5 metrics

Shares sold 16,500 shares Common stock sale reported for September 14, 2026

Sale price per share $193.06 per share Price for the 16,500 ATI common shares sold

Shares owned after transaction 97,187 shares Direct ATI common stock holdings of Timothy J. Harris after the sale

Net shares sold 16,500 shares Net sell direction across all transactions in this Form 4

Rule 10b5-1 Trading Plan date May 21, 2026 Adoption date of the trading plan governing the reported sale

Key Terms

Rule 10b5-1 Trading Plan, Senior VP and CDIO, Common Stock, par value $0.10 per share

3 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

"reporting person serves as Senior VP and CDIO of ATI"

Common Stock, par value $0.10 per share financial

"security title listed as Common Stock, par value $0.10 per share"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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 14, 2026 in an open-market or private transaction at $193.06 per share, and he held 97,187 shares directly after the sale.

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, and the Rule 10b5-1 checkbox is affirmed.

How many ATI (ATI) shares does Timothy J. Harris own after the reported sale?

Following the September 14, 2026 transaction, Senior VP and CDIO Timothy J. Harris directly owns 97,187 shares of ATI common stock, according to the reported post-transaction holdings in the Form 4 data.

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

The reported transaction price was $193.06 per share for the 16,500 shares of ATI common stock sold by Senior VP and CDIO Timothy J. Harris on September 14, 2026, described as a sale in an open market or private transaction.

What role does Timothy J. Harris hold at ATI (ATI) in this insider filing?

In this filing, Timothy J. Harris is identified as an officer of ATI, serving as Senior VP and Chief Digital and Information Officer (CDIO), and the reported holdings after the transaction are held directly by him.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/16/2026 - 08:20 PM Accepted by SEC EDGAR 09/16/2026 - 08:20 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)
09/14/2026

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	09/14/2026		S(1)		16,500	D	$193.06	97,187	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	09/16/2026
	** 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)