[Form 4] ATI Inc. Insider Trading Activity

Rhea-AI Filing Summary

Kimberly A. Fields, President & CEO of ATI Inc. (ATI), reported the sale of 15,941 shares of ATI common stock on 09/09/2025 at a price of $77.52 per share under a previously disclosed 10b5-1 trading plan dated June 11, 2025. Following the sale, Ms. Fields beneficially owned 265,287 shares. The filing indicates the transaction was executed pursuant to the trading plan for personal tax and estate planning purposes and was signed on behalf of Ms. Fields by an attorney-in-fact on 09/10/2025.

Insights

Corporate Governance Expert

TL;DR: CEO sold a small portion of holdings under a pre-established 10b5-1 plan for tax and estate planning; transaction appears routine.

The sale of 15,941 shares at $77.52 under a June 11, 2025 10b5-1 plan signals an authorized, pre-set disposition rather than opportunistic insider trading. As President & CEO, Ms. Fields' continued beneficial ownership of 265,287 shares remains material to alignment with shareholders. The filing follows Section 16 reporting requirements and includes an attorney-in-fact signature, indicating delegation of execution. For governance review, key points are the existence of a documented plan and that the disposition was disclosed promptly.

Securities/Compliance Analyst

TL;DR: Reported sale complies with Rule 10b5-1 disclosure; no red flags in timing or execution details presented.

The Form 4 shows a sale code 'S' for 15,941 shares at $77.52 executed on 09/09/2025 and expressly tied to a 10b5-1 plan dated 06/11/2025. The filing properly reports post-transaction holdings of 265,287 shares and includes the required signature and statement. From a compliance perspective, the explicit citation of the plan and prompt filing reduce insider trading concerns, though external context (e.g., blackout periods or plan adoption timing) is not provided in this document.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Fields Kimberly A

(Last) (First) (Middle)

C/O ATI INC.

2021 MCKINNEY AVE., SUITE 1100

(Street)

DALLAS TX 75201

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ATI INC [ ATI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.10 per share	09/09/2025		S		15,941(1)	D	$77.52	265,287	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares sold pursuant to a previously-disclosed 10b5-1 Trading Plan dated June 11, 2025, entered into for personal tax and estate planning purposes.

	/s/ Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields	09/10/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did ATI (ATI) insider Kimberly A. Fields sell and when?

Ms. Fields sold 15,941 shares of ATI common stock on 09/09/2025 at a price of $77.52 per share.

Was the sale by Kimberly A. Fields part of an authorized trading plan?

Yes. The sale was executed pursuant to a previously disclosed 10b5-1 trading plan dated June 11, 2025 for personal tax and estate planning purposes.

How many ATI shares does Kimberly A. Fields beneficially own after the sale?

Following the reported transaction, Ms. Fields beneficially owned 265,287 shares of ATI common stock.

Who signed the Form 4 for the reported transaction?

The Form 4 was signed by Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields on 09/10/2025.

Does the Form 4 indicate any indications of non-compliance or unusual timing?

No indications of non-compliance are stated; the filing links the sale to an approved 10b5-1 plan. The form does not include additional contextual timing details.