ATI Form 144: Kimberly Fields to Sell 20,312 Shares on NYSE

Rhea-AI Filing Summary

ATI Inc. Form 144 shows a proposed insider sale of 20,312 common shares through Fidelity Brokerage on the NYSE, with an aggregate market value of $1,631,662.96 and an approximate sale date of 09/22/2025. The filing states the company has 137,832,132 shares outstanding, so the proposed sale represents about 0.0147% of outstanding shares. The securities were acquired by the filer as restricted stock vesting on 01/04/2024 (7,973 shares) and 01/09/2024 (12,339 shares) as compensation. The filing also discloses a sale by the same person of 15,941 shares on 09/09/2025 for $1,235,746.32. The filer certifies not to possess undisclosed material information.

Positive

• Complete Rule 144 disclosure including broker, acquisition details, and prior three-month sale
• Insider sales sourced from vested restricted stock, indicating monetization of compensation rather than new loans or pledges
• Proposed sale is immaterial in size (~0.0147% of shares outstanding), suggesting limited market impact

Negative

• Insider is selling shares, which investors may view as liquidity-taking by an insider
• Recent prior sale of 15,941 shares on 09/09/2025 may indicate ongoing disposition of vested stock

Insights

Financial Analyst

TL;DR: Small insider disposition; size unlikely to affect ATI's market capitalization materially.

The proposed sale of 20,312 shares (~0.0147% of outstanding) for $1.63 million is a routine liquidity event from shares received as compensation in January 2024. The recent sale on 09/09/2025 of 15,941 shares for $1.235 million suggests the filer is monetizing vested compensation rather than executing a large, dilutive block sale. Given the modest size relative to float and absence of other corporate developments in the filing, this disclosure is unlikely to change near-term valuation assumptions.

Corporate Governance Expert

TL;DR: Proper Form 144 disclosure; the filing documents compliance with Rule 144 requirements.

The report identifies the broker, acquisition dates, nature of acquisition (restricted stock vesting), and prior sales within three months, which aligns with Rule 144 reporting expectations. The filer’s signed representation about lacking material nonpublic information is included. From a governance perspective, the record shows transparency about insider monetization of compensation but contains no information about trading plans or other governance issues.

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

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	20312	1631662.96	137832132	09/22/2025	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	01/04/2024	Restricted Stock Vesting	Issuer			7973	01/04/2024	Compensation
Common	01/09/2024	Restricted Stock Vesting	Issuer			12339	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

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 filed here disclose?

The filing discloses a proposed sale of 20,312 common shares via Fidelity on the NYSE for an aggregate value of $1,631,662.96, with an approximate sale date of 09/22/2025.

Who is the seller named in the Form 144 for ATI?

The filing records a sale by Kimberly A. Fields (address listed) as the person for whose account the securities are to be sold.

How were the shares acquired that are being sold?

The shares were acquired as restricted stock vesting on 01/04/2024 (7,973 shares) and 01/09/2024 (12,339 shares), with payment characterized as compensation.

Has the seller recently sold ATI shares?

Yes. The filing discloses a sale on 09/09/2025 of 15,941 shares for $1,235,746.32.

What percentage of ATI outstanding shares is the proposed sale?

The proposed sale of 20,312 shares represents about 0.0147% of the 137,832,132 shares outstanding reported in the filing.