ATI (NYSE) Rule 144 notice: 3,783 vested shares; insider sales listed

Rhea-AI Filing Summary

ATI filed a Rule 144 notice for the proposed resale of 3,783 shares of Common Stock arising from a restricted stock vesting dated 01/03/2026.

Separately, the filing lists recent open-market dispositions by Kimberly A. Fields, including 40,000 shares on 05/11/2026 and 59,749 shares on 06/02/2026. Shares outstanding were 136,470,427 as of 06/24/2026.

Insights

Securities Counsel

Rule 144 notice: resale of restricted shares and recent insider dispositions.

The filing lists 3,783 shares identified as resulting from a restricted stock vesting on 01/03/2026, which the holder intends to resell under Rule 144 resale provisions. The document separates the vesting event from prior open-market sales by Kimberly A. Fields.

Market impact depends on holder actions; the excerpt shows recent dispositions by Kimberly A. Fields (examples include 40,000 and 59,749 shares). Timing and distribution methods for the 3,783 shares are tied to Rule 144 mechanics in practice.

Key Figures

Shares listed for resale: 3,783 shares Shares outstanding: 136,470,427 Recent sale (example): 40,000 shares +3 more

6 metrics

Shares listed for resale 3,783 shares restricted stock vesting on <date>01/03/2026</date>

Shares outstanding 136,470,427 as of <date>06/24/2026</date>

Recent sale (example) 40,000 shares sale by Kimberly A. Fields on <date>05/11/2026</date>

Recent sale (example) 59,749 shares sale by Kimberly A. Fields on <date>06/02/2026</date>

Recent sale proceeds $6,368,283.35 proceeds shown for 40,000-share sale on <date>05/11/2026</date>

Recent sale proceeds $10,699,079.13 proceeds shown for 59,749-share sale on <date>06/02/2026</date>

Key Terms

Rule 144, Restricted Stock Vesting, Issuer / Compensation

3 terms

Rule 144 regulatory

"filed a Rule 144 notice for the proposed resale of 3,783 shares"

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.

Restricted Stock Vesting financial

"Common | 01/03/2026 | 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.

Issuer / Compensation regulatory

"Issuer ... Compensation 3783 01/03/2026"

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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	3783	746045.43	136470427	06/24/2026	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			3783	01/03/2026	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
Kimberly A. Fields 2021 McKinney Avenue Dallas TX 75201	Common	06/22/2026	13269	2686707.12
Kimberly A. Fields 2021 McKinney Avenue Dallas TX 75201	Common	06/23/2026	3641	719024.68

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 quantity of ATI shares are listed for resale on this Rule 144 filing?

The filing lists 3,783 shares of ATI Common Stock for proposed resale. These shares are tied to a restricted stock vesting event dated 01/03/2026 and are presented as the securities to be sold under Rule 144.

How were the 3,783 ATI shares acquired?

They were acquired through a restricted stock vesting event dated 01/03/2026. The filing labels the acquisition source as Compensation, indicating issuance by the issuer upon vesting.

Which insider reported recent ATI sales in the filing?

The filing shows recent dispositions by Kimberly A. Fields. Example sales include 40,000 shares on 05/11/2026 and 59,749 shares on 06/02/2026, with dollar amounts shown alongside each trade.

What is ATI's reported share count context in this filing?

The document reports 136,470,427 shares outstanding as of 06/24/2026. This figure appears alongside the securities table and provides a company-wide share baseline in the excerpt.