ATI Form 4: CEO Kimberly Fields sells 21,153 shares at $85.87

Rhea-AI Filing Summary

ATI (ATI) insider transaction: President, CEO and Director Kimberly A. Fields reported a sale of Common Stock. On 10/15/2025, she sold 21,153 shares at $85.87 per share in a transaction coded “S.” The filing states this sale was made pursuant to a Rule 10b5-1 trading plan dated June 11, 2025 established for personal tax and estate planning purposes.

Following the sale, Fields beneficially owned 202,668 shares directly. The reported security is Common Stock, par value $0.10 per share. The filing was made by one reporting person.

Insider Trade Summary

Net Seller: 21,153 shares ($1,816,408)

Net Sell 1 txn

Insider Fields Kimberly A

Role President, CEO and Director

Sold 21,153 shs ($1.82M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share	21,153	$85.87	$1.82M

Holdings After Transaction: Common Stock, par value $0.10 per share — 202,668 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2025

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	10/15/2025		S		21,153(1)	D	$85.87	202,668	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 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	10/16/2025
	** 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) disclose in this Form 4?

A sale by President, CEO and Director Kimberly A. Fields of 21,153 Common Stock shares at $85.87 on 10/15/2025.

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

After the sale, she beneficially owned 202,668 shares directly.

What was the transaction code and price for the ATI stock sale?

The transaction code was “S” (open market or private sale) at $85.87 per share.

Was the ATI insider sale under a Rule 10b5-1 plan?

Yes. The sale was pursuant to a Rule 10b5-1 trading plan dated June 11, 2025.

Who is the reporting person in ATI’s Form 4 filing?

Kimberly A. Fields, ATI’s President, CEO and Director.

What class of security was involved in the ATI transaction?

Common Stock, par value $0.10 per share.

Was this filing made by a single person or a group?

Form 4 was filed by one reporting person.