ATI shareholder files Form 144 to sell 10,543 common shares

Rhea-AI Filing Summary

ATI (ATI): Form 144 notice of proposed sale. A shareholder filed to sell up to 10,543 shares of ATI common stock with an aggregate market value of $1,029,945.67, through Fidelity Brokerage Services LLC on or about 11/11/2025 on the NYSE.

The shares listed for sale were acquired via restricted stock vesting from the issuer on 01/03/2024 (1,722 shares), 01/04/2024 (681), and 01/09/2024 (8,140). Shares outstanding were 135,863,661; this is a baseline figure, not the amount being sold. In the past three months, the filer sold 10,543 shares on 11/04/2025 for gross proceeds of $1,012,866.01.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	10543	1029945.67	135863661	11/11/2025	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	01/03/2024	Restricted Stock Vesting	Issuer			1722	01/03/2024	Compensation
Common	01/04/2024	Restricted Stock Vesting	Issuer			681	01/04/2024	Compensation
Common	01/09/2024	Restricted Stock Vesting	Issuer			8140	01/09/2024	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Timothy J. Harris 2021 McKinney Avenue Dallas TX 75201	Common	11/04/2025	10543	1012866.01

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does ATI's Form 144 filing disclose?

A proposed sale of up to 10,543 ATI common shares with an aggregate market value of $1,029,945.67.

When is the proposed sale date for ATI (ATI) shares?

The approximate sale date is 11/11/2025.

Which broker and exchange are listed for the ATI sale?

Broker: Fidelity Brokerage Services LLC; Exchange: NYSE.

How were the ATI shares to be sold acquired?

They were acquired via restricted stock vesting on 01/03/2024 (1,722), 01/04/2024 (681), and 01/09/2024 (8,140).

How many ATI shares are outstanding per the notice?

The filing lists 135,863,661 shares outstanding.

Were there recent ATI share sales by the filer?

Yes. On 11/04/2025, the filer sold 10,543 shares for gross proceeds of $1,012,866.01.