[144] ATI INC SEC Filing

Rhea-AI Filing Summary

ATI reports that stockholder Timothy J. Harris filed a notice under Rule 144 to sell 10,542 shares of ATI common stock, with an aggregate market value of $1,030,691.34.

The shares to be sold were acquired through restricted stock vesting on January 9, 2024 as compensation from the issuer. ATI had 135,863,661 common shares outstanding, and the planned sale is listed for around November 18, 2025 on the NYSE through Fidelity Brokerage Services LLC. The filing also notes that Harris sold 10,543 common shares on November 4, 2025 for gross proceeds of $1,012,866.01 and another 10,543 shares on November 11, 2025 for $1,029,945.67.

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	10542	1030691.34	135863661	11/18/2025	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			10542	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
Timothy J. Harris 2021 McKinney Avenue Dallas TX 75201	Common	11/11/2025	10543	1029945.67

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 by Timothy J. Harris disclose?

The Form 144 shows that Timothy J. Harris plans to sell 10,542 shares of ATI common stock under Rule 144, with an aggregate market value of $1,030,691.34.

How many ATI shares did Timothy J. Harris recently sell before this Form 144?

The filing states that 10,543 ATI common shares were sold on November 4, 2025 for $1,012,866.01 and another 10,543 shares were sold on November 11, 2025 for $1,029,945.67.

How did Timothy J. Harris acquire the ATI shares covered by the Form 144?

The 10,542 ATI common shares to be sold were acquired on January 9, 2024 through restricted stock vesting, described as compensation from the issuer.

On which exchange and through which broker is the ATI Form 144 sale planned?

The Form 144 lists Fidelity Brokerage Services LLC as broker and names the NYSE as the securities exchange for the planned sale of 10,542 ATI common shares.

What is the approximate date of sale for the ATI shares in this Form 144?

The notice indicates an approximate sale date of November 18, 2025 for the planned disposition of 10,542 ATI common shares under Rule 144.

How many ATI shares were outstanding when the Form 144 was prepared?

The Form 144 states that 135,863,661 ATI common shares were outstanding at the time referenced in the filing.