ATI: Timothy J. Harris plans $3.4M stock sale

ATI INC (ATI) received a notice of proposed sale of securities under Rule 144 for the account of Timothy J. Harris.

Rhea-AI Filing Summary

ATI INC (ATI) received a notice of proposed sale of securities under Rule 144 for the account of Timothy J. Harris. The filing covers up to 16,500 shares of ATI common stock to be sold through Fidelity Brokerage Services LLC on the NYSE on or before August 24, 2026. These shares are tied to restricted stock vesting dated January 6, 2025 and are described as compensation-related.

Key Figures

Shares proposed to be sold: 16,500 shares of common stock Approximate aggregate market value: 3,414,180.00 Latest date of proposed sale: 08/24/2026 +1 more

4 metrics

Shares proposed to be sold 16,500 shares of common stock Maximum number of ATI shares to be sold under Rule 144 for the account of Timothy J. Harris

Approximate aggregate market value 3,414,180.00 Value associated with the 16,500 ATI common shares proposed to be sold

Latest date of proposed sale 08/24/2026 Date by which the Rule 144 sale of ATI shares may occur on the NYSE

Restricted stock vesting date 01/06/2025 Date tied to the restricted stock vesting for the 16,500 ATI shares

Key Terms

Rule 144, restricted stock vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock vesting financial

"Common | 01/06/2025 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Timothy J. Harris"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What does this Form 144 filing mean for ATI (ATI)?

It gives notice that 16,500 shares of ATI common stock held for the account of Timothy J. Harris may be sold under Rule 144 through Fidelity Brokerage Services LLC on the NYSE by August 24, 2026.

How many ATI (ATI) shares are covered by this Rule 144 notice?

The notice covers up to 16,500 shares of ATI common stock. These shares are linked to restricted stock vesting dated January 6, 2025 and are characterized as compensation.

Who is selling ATI (ATI) shares under this Form 144?

The potential sale is for the account of Timothy J. Harris. The Form 144 is signed by Gary Redman as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for Harris.

What is the approximate market value of ATI (ATI) shares in this Form 144?

The filing lists an approximate aggregate market value of 3,414,180.00 for the 16,500 shares of ATI common stock proposed to be sold under Rule 144.

When do the ATI (ATI) restricted shares in this Form 144 vest?

The shares are associated with restricted stock vesting dated January 6, 2025, and are identified as compensation in the Form 144 securities-to-be-sold section.

Which broker is handling the proposed ATI (ATI) share sale?

The proposed sale of 16,500 ATI common shares is to be executed through Fidelity Brokerage Services LLC, with trading indicated on the NYSE.

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

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Available on EDGAR 08/24/2026 - 09:48 AM EDT Accepted by SEC EDGAR 08/24/2026 - 09:47 AM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001776844
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ATI INC
SEC File Number	001-12001
Address of Issuer	2021 MCKINNEY AVENUE DALLAS TEXAS 75201
Phone	4123942800
Name of Person for Whose Account the Securities are To Be Sold	Harris Timothy J
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	16500	3414180.00	136170383	08/24/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	01/06/2025	Restricted Stock Vesting	Issuer			16500	01/06/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/24/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/21/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Timothy J. Harris
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)