ATI Form 144: Proposed sale of 21,153 shares, $1,816,408

ATI filed a Form 144 noting a proposed sale of 21,153 common shares with an aggregate market value of $1,816,408.11, expected on or about October 15, 2025 on the NYSE through Fidelity Brokerage Services LLC.

Rhea-AI Filing Summary

ATI filed a Form 144 noting a proposed sale of 21,153 common shares with an aggregate market value of $1,816,408.11, expected on or about October 15, 2025 on the NYSE through Fidelity Brokerage Services LLC. These shares were acquired on January 9, 2024 via restricted stock vesting as compensation.

Recent activity for the same account shows additional sales in the past three months: 15,941 shares on September 9, 2025 for $1,235,746.32; 20,312 shares on September 22, 2025 for $1,631,662.96; and 21,154 shares on October 6, 2025 for $1,735,262.62. Shares outstanding were 137,832,132.

FAQ

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

How many ATI (ATI) shares are proposed to be sold under this Form 144?

The notice covers a proposed sale of 21,153 common shares.

What is the aggregate market value of the proposed ATI share sale?

The aggregate market value listed is $1,816,408.11.

When is the proposed ATI sale expected to occur?

The approximate date of sale is October 15, 2025.

On which exchange and through which broker will ATI shares be sold?

The shares are listed for sale on the NYSE via Fidelity Brokerage Services LLC.

How were the ATI shares to be sold acquired?

They were acquired on January 9, 2024 via restricted stock vesting as compensation.

What ATI sales occurred in the past three months for this account?

Sales were 15,941 shares on 09/09/2025 for $1,235,746.32; 20,312 on 09/22/2025 for $1,631,662.96; and 21,154 on 10/06/2025 for $1,735,262.62.

How many ATI shares are outstanding?

The filing lists 137,832,132 shares outstanding.

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

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Accepted by SEC EDGAR 10/15/2025 - 10:28 AM 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	0001773072
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	Fields Kimberly A
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
Relationship to Issuer	Director

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	21153	1816408.11	137832132	10/15/2025	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	01/09/2024	Restricted Stock Vesting	Issuer			21153	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
Kimberly A. Fields 2021 McKinney Avenue Dallas TX 75201	Common	09/09/2025	15941	1235746.32
Kimberly A. Fields 2021 McKinney Avenue Dallas RI 75201	Common	09/22/2025	20312	1631662.96
Kimberly A. Fields 2021 McKinney Avenue Dallas TX 75201	Common	10/06/2025	21154	1735262.62

144: Remarks and Signature

Remarks
Date of Notice	10/15/2025
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/11/2025
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/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Kimberly A. Fields
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)