ATI (ATI) CEO sells 59,749 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

ATI Inc. Chair, President and CEO Kimberly A. Fields reported open-market sales of 59,749 shares of common stock on June 2, 2026. The trades were executed at prices reported around $177.97–$182.75 per share and were carried out under a pre-arranged Rule 10b5-1 trading plan dated February 5, 2026, established for personal tax and estate planning purposes. Following these transactions, Fields continues to hold 218,014 shares of ATI common stock directly.

Insights

Equity governance analyst

CEO executes pre-planned net sale of 59,749 ATI shares while retaining a substantial equity position.

ATI Inc. Chair, President and CEO Kimberly A. Fields conducted a series of open-market sales totaling 59,749 shares of common stock on June 2, 2026. Reported prices ranged from about $177.97 to $182.75 per share.

The filing states these transactions were made under a Rule 10b5-1 trading plan dated February 5, 2026 for personal tax and estate planning purposes, indicating the sales were pre-scheduled rather than opportunistic. There were no option exercises or derivative transactions reported.

After the sales, Fields holds 218,014 ATI shares directly, according to the filing. This suggests she maintains a meaningful ongoing stake in the company. Future company filings may provide additional context on any further activity under this trading plan.

Insider Trade Summary 10b5-1

Net Seller: 59,749 shares ($10,698,980)

Net Sell 6 txns

Insider Fields Kimberly A

Role Chair, President and CEO

Sold 59,749 shs ($10.70M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.10 per share	25,823	$177.97	$4.60M
Sale	Common Stock, par value $0.10 per share	13,865	$179.05	$2.48M
Sale	Common Stock, par value $0.10 per share	13,164	$179.71	$2.37M
Sale	Common Stock, par value $0.10 per share	1,896	$180.80	$343K
Sale	Common Stock, par value $0.10 per share	2,000	$181.90	$364K
Sale	Common Stock, par value $0.10 per share	3,001	$182.75	$548K

Holdings After Transaction: Common Stock, par value $0.10 per share — 251,940 shares (Direct, null)

Footnotes (1)

1. Shares sold pursuant to a 10b5-1 Trading Plan dated February 5, 2026, entered into for personal tax and estate planning purposes. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $177.42 to $178.35. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the U.S. Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares sold at each specific price within the range reported. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $178.42 to $179.40. 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. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $179.41 to $180.27. 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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.45 to $181.26. 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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.47 to $182.45. 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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.49 to 183.18. 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.

Key Figures

Shares sold: 59,749 shares Highest reported sale price: $182.75 per share Example sale price: $177.97 per share +3 more

6 metrics

Shares sold 59,749 shares Total common shares sold on June 2, 2026

Highest reported sale price $182.75 per share One tranche of open-market sales

Example sale price $177.97 per share One reported weighted average sale price

Post-transaction holdings 218,014 shares ATI common stock held directly after sales

Number of sale transactions 6 transactions Non-derivative open-market sales on June 2, 2026

10b5-1 plan date February 5, 2026 Date of Rule 10b5-1 Trading Plan used for sales

Key Terms

10b5-1 Trading Plan, weighted average price, open-market sale, Form 4

4 terms

10b5-1 Trading Plan regulatory

"Shares sold pursuant to a 10b5-1 Trading Plan dated February 5, 2026, entered into for personal tax and estate planning purposes."

A 10b5-1 trading plan is a pre-arranged strategy that allows company insiders to buy or sell company stock at set times, regardless of their current knowledge about the company's situation. It acts like a scheduled appointment for trading, helping prevent the appearance of impropriety or insider trading. This plan provides a way for insiders to sell or buy shares in a controlled, transparent manner, offering reassurance to investors about fair trading practices.

weighted average price financial

"The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $177.42 to $178.35."

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 sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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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 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)
06/02/2026

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	06/02/2026		S		25,823(1)	D	$177.97(2)	251,940	D
Common Stock, par value $0.10 per share	06/02/2026		S		13,865(1)	D	$179.05(3)	238,075	D
Common Stock, par value $0.10 per share	06/02/2026		S		13,164(1)	D	$179.71(4)	224,911	D
Common Stock, par value $0.10 per share	06/02/2026		S		1,896(1)	D	$180.8(5)	223,015	D
Common Stock, par value $0.10 per share	06/02/2026		S		2,000(1)	D	$181.9(6)	221,015	D
Common Stock, par value $0.10 per share	06/02/2026		S		3,001(1)	D	$182.75(7)	218,014	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 $177.42 to $178.35. The reporting person undertakes to provide to the Issuer, its security holders and the Staff of the U.S. Securities and Exchange Commission (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 $178.42 to $179.40. 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 $179.41 to $180.27. 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. These shares were sold in multiple transactions at prices ranging from $180.45 to $181.26. 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. These shares were sold in multiple transactions at prices ranging from $181.47 to $182.45. 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.

7. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.49 to 183.18. 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.

	/s/ Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields	06/04/2026
	** 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)

FAQ

How many ATI (ATI) shares did CEO Kimberly Fields sell in this Form 4?

Kimberly Fields sold 59,749 ATI shares. The Form 4 shows six open-market sale transactions on June 2, 2026, totaling 59,749 shares of common stock at prices generally between about $177.97 and $182.75 per share.

At what prices did ATI CEO Kimberly Fields sell her shares?

The reported sales occurred around $177.97–$182.75 per share. Each line item uses a weighted average price, with footnotes explaining that the actual trades occurred in multiple transactions within narrow price ranges on June 2, 2026.

Does the ATI Form 4 indicate that the CEO’s stock sales were pre-planned?

Yes, the sales were made under a Rule 10b5-1 trading plan. A footnote states they were executed pursuant to a 10b5-1 Trading Plan dated February 5, 2026, adopted for personal tax and estate planning purposes, indicating pre-arranged transactions.

How many ATI shares does CEO Kimberly Fields hold after these transactions?

Fields holds 218,014 ATI shares after the sales. The Form 4 reports that following the June 2, 2026 open-market transactions, her direct ownership position in ATI common stock stands at 218,014 shares.

Were any stock options or derivatives involved in this ATI Form 4 filing?

No derivative transactions were reported. All six entries involve non-derivative common stock sales, and the derivative position summary is empty, indicating there were no option exercises, conversions, or other derivative-related transactions in this filing.

What reason does the ATI filing give for CEO Kimberly Fields’ share sales?

The filing cites tax and estate planning purposes. A footnote explains that the sales were executed under a 10b5-1 Trading Plan dated February 5, 2026, entered into for personal tax and estate planning, framing the transactions as planned financial management.