ATI Form 144: Proposed sale of 59,749 vested shares

Filer submitted a Form 144 disclosing a proposed sale of 59,749 shares of Common Stock tied to restricted stock vesting dated 01/05/2026.

Rhea-AI Filing Summary

Filer submitted a Form 144 disclosing a proposed sale of 59,749 shares of Common Stock tied to restricted stock vesting dated 01/05/2026. The filing shows a prior disposition of 40,000 shares reported on 05/11/2026 with an indicated proceeds figure of $6,368,283.35. The transaction is recorded with Fidelity Brokerage Services LLC and lists 06/02/2026 and NYSE as venue details.

Insights

Securities Compliance Analyst

Form 144 reports a proposed resale of vested restricted shares and a recent sale of 40,000 shares.

The filing lists 59,749 shares associated with restricted stock vesting on 01/05/2026 and a prior disposition of 40,000 shares on 05/11/2026 with proceeds shown as $6,368,283.35. Details attach the broker as Fidelity Brokerage Services LLC and record the market as NYSE.

These entries are administrative notices under resale rules; cashflow treatment and ultimate sale timing are governed by Rule 144 conditions and the broker instructions. Subsequent filings would show completion or changes in method.

Key Figures

Proposed resale quantity: 59,749 shares Prior disposition: 40,000 shares Proceeds shown for prior sale: $6,368,283.35

3 metrics

Proposed resale quantity 59,749 shares Restricted Stock Vesting on <date>01/05/2026</date>

Prior disposition 40,000 shares Sold on <date>05/11/2026</date>

Proceeds shown for prior sale $6,368,283.35 Associated with the 40,000-share disposition on <date>05/11/2026</date>

Key Terms

Restricted Stock Vesting, Form 144, Fidelity Brokerage Services LLC

3 terms

Restricted Stock Vesting financial

"Common | 01/05/2026 | 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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Fidelity Brokerage Services LLC other

"Common | Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI"

FAQ

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

What does ATI's Form 144 disclose about share sales?

The filing discloses a proposed sale of 59,749 shares tied to restricted stock vesting on 01/05/2026. It also records a prior sale of 40,000 shares on 05/11/2026 with proceeds shown as $6,368,283.35.

Who is the broker and what market is listed on the filing?

The broker is listed as Fidelity Brokerage Services LLC. The filing records the market as NYSE and includes a filing date reference of 06/02/2026 in the table header.

Are the 59,749 shares registered sales or related to compensation?

The 59,749 shares are shown under a row labeled Restricted Stock Vesting with the issuer as the source and a date of 01/05/2026, indicating they arise from compensation vesting rather than an open-market purchase.

Does the Form 144 state proceeds or cash‑flow recipient for the proposed sale?

The excerpt lists a numeric figure of $6,368,283.35 tied to the prior 40,000-share disposition; the filing does not explicitly attribute who receives proceeds for the proposed 59,749-share resale in the provided excerpt.

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

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Accepted by SEC EDGAR 06/02/2026 - 11:13 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	59749	10599472.60	136470427	06/02/2026	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	01/05/2026	Restricted Stock Vesting	Issuer			59749	01/05/2026	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	05/11/2026	40000	6368283.35

144: Remarks and Signature

Remarks
Date of Notice	06/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/05/2026
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/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Kimberly Fields
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)