ATI CEO sells 24,845 shares in pre-set plan

ATI INC (ATI) reported that Chair, President and CEO Kimberly A. Fields sold an aggregate 24,845 shares of common stock on August 17, 2026 under a Rule 10b5-1 trading plan dated February 5, 2026, entered into for personal tax and estate planning purposes.

Rhea-AI Filing Summary

ATI INC (ATI) reported that Chair, President and CEO Kimberly A. Fields sold an aggregate 24,845 shares of common stock on August 17, 2026 under a Rule 10b5-1 trading plan dated February 5, 2026, entered into for personal tax and estate planning purposes. The sales occurred in multiple open-market transactions at weighted average prices ranging from $228.32 to $232.43 per share, with detailed price ranges disclosed in footnotes.

Insider Trade Summary 10b5-1

Net Seller: 24,845 shares

Net Sell 5 txns

Insider Fields Kimberly A

Role Chair, President and CEO

Sold 24,845 shs ($5.74M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share F1, F2	1,000	$228.32	$228K
Sale	Common Stock, par value $0.10 per share F1, F3	2,000	$229.56	$459K
Sale	Common Stock, par value $0.10 per share F1, F4	8,131	$230.66	$1.88M
Sale	Common Stock, par value $0.10 per share F1, F5	9,116	$231.72	$2.11M
Sale	Common Stock, par value $0.10 per share F1, F6	4,598	$232.43	$1.07M

Holdings After Transaction: Common Stock, par value $0.10 per share — 100,719 shares (Direct)

Footnotes (6)

1. F1. Shares sold pursuant to a 10b5-1 Trading Plan dated February 5, 2026, entered into for personal tax and estate planning purposes.
2. F2. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $228.02 to $228.73. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.
3. F3. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $229.14 to $230.07. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.
4. F4. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $230.17 to $231.16. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.
5. F5. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $231.20 to $232.18. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.
6. F6. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $232.19 to $232.74. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

Key Figures

Total shares sold: 24,845 shares Block sale 1: 1,000 shares at $228.32 Block sale 2: 2,000 shares at $229.56 +4 more

7 metrics

Total shares sold 24,845 shares Aggregate ATI common shares sold by Kimberly A. Fields on August 17, 2026

Block sale 1 1,000 shares at $228.32 First reported open-market sale of ATI common stock on August 17, 2026

Block sale 2 2,000 shares at $229.56 Second reported open-market sale of ATI common stock on August 17, 2026

Block sale 3 8,131 shares at $230.66 Third reported open-market sale of ATI common stock on August 17, 2026

Block sale 4 9,116 shares at $231.72 Fourth reported open-market sale of ATI common stock on August 17, 2026

Block sale 5 4,598 shares at $232.43 Fifth reported open-market sale of ATI common stock on August 17, 2026

Number of sale transactions 5 Count of non-derivative sale entries in the Form 4 transaction summary

Key Terms

Rule 10b5-1 Trading Plan, weighted average price, open market or private transaction, personal tax and estate planning purposes

4 terms

Rule 10b5-1 Trading Plan regulatory

"Shares sold pursuant to a 10b5-1 Trading Plan dated February 5, 2026"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported is a weighted average price. The shares were sold"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

personal tax and estate planning purposes financial

"entered into for personal tax and estate planning purposes"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ATI (ATI) disclose for Kimberly A. Fields on August 17, 2026?

ATI disclosed that CEO Kimberly A. Fields sold 24,845 shares of ATI common stock on August 17, 2026. The Form 4 reports five open-market sales in ATI common stock, all executed pursuant to a pre-arranged Rule 10b5-1 trading plan.

At what prices were Kimberly A. Fields’ ATI (ATI) shares sold on August 17, 2026?

The reported weighted average prices ranged from $228.32 to $232.43 per share across five transactions. Footnotes state each block was sold in multiple trades within narrower ranges, with ATI’s CEO undertaking to provide full price breakdowns upon request.

How many ATI (ATI) shares did Kimberly A. Fields sell in total on August 17, 2026?

Kimberly A. Fields sold a total of 24,845 shares of ATI common stock. The Form 4 transaction summary shows five separate sale transactions with an aggregate net-sell amount of 24,845 shares and no corresponding purchases or option exercises.

Was the August 17, 2026 ATI (ATI) stock sale by Kimberly A. Fields under a Rule 10b5-1 plan?

Yes. The filing and footnotes state the sales were made under a Rule 10b5-1 Trading Plan dated February 5, 2026. The plan was entered into for personal tax and estate planning purposes, indicating the trades were pre-arranged.

What type of transactions did ATI (ATI) report for Kimberly A. Fields in this Form 4?

All reported transactions were sales of common stock coded “S,” described as open market or private transactions. There were five non-derivative sale entries and no reported purchases, option exercises, gifts, or derivative transactions in this Form 4.

Does the Form 4 state how many ATI (ATI) shares Kimberly A. Fields owns after these sales?

The individual transaction rows do not report a post-transaction share balance for these sales. Each line shows the sale amounts and prices, but the “shares following transaction” field is not populated in the data provided for this Form 4.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 08/19/2026 - 05:05 PM EDT Learn about SEC filing dates

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 TEXAS 75201

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	Chair, President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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

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

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

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	08/17/2026		S(1)		1,000	D	$228.32(2)	124,564	D
Common Stock, par value $0.10 per share	08/17/2026		S(1)		2,000	D	$229.56(3)	122,564	D
Common Stock, par value $0.10 per share	08/17/2026		S(1)		8,131	D	$230.66(4)	114,433	D
Common Stock, par value $0.10 per share	08/17/2026		S(1)		9,116	D	$231.72(5)	105,317	D
Common Stock, par value $0.10 per share	08/17/2026		S(1)		4,598	D	$232.43(6)	100,719	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 February 5, 2026, entered into for personal tax and estate planning purposes.

2. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $228.02 to $228.73. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

3. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $229.14 to $230.07. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

4. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $230.17 to $231.16. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

5. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $231.20 to $232.18. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

6. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $232.19 to $232.74. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the SEC, upon request, full information regarding the number of shares sold at each specific price within the range reported.

	/s/ Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields	08/19/2026
	** 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.
* Form 4: SEC 1474 (03-26)