[Form 4] ATI INC Insider Trading Activity

Rhea-AI Filing Summary

Kimberly A. Fields, President, CEO and Director of ATI Inc. (ATI), reported a sale of 20,312 shares of ATI common stock on 09/22/2025 at $80.33 per share. After the transaction she beneficially owned 244,975 shares. The sale was made pursuant to a 10b5-1 trading plan dated June 11, 2025, and was executed for personal tax and estate planning purposes. The Form 4 was signed by Amanda J. Skov as attorney-in-fact on 09/23/2025.

Positive

• Sale executed under a documented 10b5-1 trading plan, which supports compliance and reduces timing concerns
• Timely and clear disclosure of shares sold, price, and post-transaction beneficial ownership
• Transaction purpose stated (personal tax and estate planning), providing transparency to investors

Negative

• Reduction in insider holdings by 20,312 shares, lowering beneficial ownership to 244,975 shares
• Sale value concentration: shares sold at $80.33 represent a non-zero position change for a senior executive

Insights

Financial Analyst

TL;DR: Insider sold a modest number of shares under a pre-established 10b5-1 plan; transaction is routine and non-surprising.

The sale of 20,312 shares at $80.33 reduces the reporting persons stake to 244,975 shares but was executed under a documented 10b5-1 plan dated June 11, 2025 for tax and estate planning. Transactions under such plans are typically pre-scheduled and intended to mitigate timing concerns and insider trading risk. No derivatives or additional transactions were reported. The disclosure is timely and complies with Section 16 reporting requirements, offering transparency to investors.

Corporate Governance Expert

TL;DR: Governance process appears proper: sale executed under a 10b5-1 plan and properly reported.

The Form 4 identifies Kimberly A. Fields as President, CEO and Director and indicates the sale was pursuant to a 10b5-1 plan entered June 11, 2025 for personal tax and estate planning. The filing was executed by an attorney-in-fact, which is an acceptable procedural mechanism. There are no indications in this Form 4 of atypical timing, undisclosed related-party transactions, or derivative activity. This is a routine disclosure consistent with good governance practices.

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)
09/22/2025

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	09/22/2025		S		20,312(1)	D	$80.33	244,975	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	09/23/2025
	** 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 Kimberly A. Fields sell in the Form 4 for ATI (ATI)?

She sold 20,312 shares of ATI common stock on 09/22/2025 at $80.33 per share.

Why was the ATI (ATI) insider sale made?

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

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

Following the transaction she beneficially owned 244,975 shares.

Who filed the Form 4 for Kimberly A. Fields?

The Form 4 was signed and filed by Amanda J. Skov, Attorney-in-Fact on 09/23/2025.

Does the Form 4 report any derivative transactions for ATI (ATI)?

No. The filing reports a non-derivative sale of common stock and contains no derivative transactions.