Holder resale notice and insider sales reported for ATI (NYSE: ATI)

Rhea-AI Filing Summary

ATI notice of proposed resale under Rule 144 by a broker/holder. The filing lists restricted stock vesting entries of 3,405 shares (01/03/2026) and 9,864 shares (01/05/2026). It also reports two recent dispositions by Kimberly A. Fields: 40,000 shares sold on 05/11/2026 for $6,368,283.35 and 59,749 shares sold on 06/02/2026 for $10,699,079.13.

Key Figures

Filing header date: 06/22/2026 Restricted shares vested (01/03/2026): 3,405 shares Restricted shares vested (01/05/2026): 9,864 shares +2 more

5 metrics

Filing header date 06/22/2026 Form 144 header date

Restricted shares vested (01/03/2026) 3,405 shares Restricted Stock Vesting on 01/03/2026

Restricted shares vested (01/05/2026) 9,864 shares Restricted Stock Vesting on 01/05/2026

Sale by Kimberly A. Fields (05/11/2026) 40,000 shares Sale on 05/11/2026 for $6,368,283.35

Sale by Kimberly A. Fields (06/02/2026) 59,749 shares Sale on 06/02/2026 for $10,699,079.13

Key Terms

Restricted Stock Vesting, Rule 144, Issuer

3 terms

Restricted Stock Vesting regulatory

"Restricted Stock Vesting | Issuer | 3,405 | 01/03/2026"

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.

Rule 144 regulatory

"Form type listed as 144: Filer Information"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Issuer financial

"Restricted Stock Vesting | Issuer | Compensation"

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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	13269	2686707.12	136470427	06/22/2026	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	01/03/2026	Restricted Stock Vesting	Issuer			3405	01/03/2026	Compensation
Common	01/05/2026	Restricted Stock Vesting	Issuer			9864	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
Kimberly A. Fields 2021 McKinney Avenue Dallas TX 75201	Common	06/02/2026	59749	10699079.13

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 the ATI Form 144 report?

It reports proposed resale activity under Rule 144 and recent sales. The filing lists vesting of 3,405 and 9,864 restricted shares and two cash sales by Kimberly A. Fields totaling 99,749 shares with proceeds of $17,067,362.48.

How many restricted shares vested for ATI in early January 2026?

A total of 13,269 restricted shares vested in early January 2026. The filing shows 3,405 shares vested on 01/03/2026 and 9,864 shares vested on 01/05/2026 as compensation-related events.

What recent insider sales are disclosed for ATI?

The filing discloses two sales by Kimberly A. Fields: 40,000 shares on 05/11/2026 and 59,749 shares on 06/02/2026. Reported gross proceeds were $6,368,283.35 and $10,699,079.13, respectively.

Does the Form 144 state who receives the sale proceeds?

The filing lists transaction amounts but does not state proceeds recipients. It shows gross sale proceeds for the two dispositions but does not specify where those proceeds were paid or how they were used.

Are the January 2026 vested shares part of compensation for ATI?

Yes. The filing labels both January entries as "Restricted Stock Vesting" and categorizes them as Compensation, indicating the shares were issuances tied to compensation on the listed dates.