Kimberly A. Fields - 02 Jun 2026 Form 4 Insider Report for ATI INC (ATI)

Reporting relationship: Chair, President and CEO, Director
Issuer ticker: ATI
Reported as of: 02 Jun 2026
Net transaction value: -$10,698,980
SEC form: 4
Accepted by SEC: 04 Jun 2026, 19:14:52 UTC
Prior SEC filing: 12 May 2026
Next SEC filing: 24 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields

Key filing fact

Kimberly A. Fields filed Form 4 for ATI INC (ATI) on 04 Jun 2026.

Key facts

This page summarizes Kimberly A. Fields's Form 4 filing for ATI INC (ATI).
6 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 04 Jun 2026, 19:14.

Change

Previous filing in this sequence was filed on 12 May 2026.
Current net transaction value: -$10,698,980.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001773072 Primary reporting owner

Fields Kimberly A

Relationship: Chair, President and CEO, Director
Address: C/O ATI INC., 2021 MCKINNEY AVE., SUITE 1100, DALLAS
Signature: /s/ Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields
Signature date: 04 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $4,595,719
Shares: -25,823
Change %: -9.3%
Price: $177.97
Shares after: 251,940
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F2

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $2,482,528
Shares: -13,865
Change %: -5.5%
Price: $179.05
Shares after: 238,075
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F3

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $2,365,702
Shares: -13,164
Change %: -5.5%
Price: $179.71
Shares after: 224,911
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F4

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $342,797
Shares: -1,896
Change %: -0.84%
Price: $180.80
Shares after: 223,015
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F5

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $363,800
Shares: -2,000
Change %: -0.9%
Price: $181.90
Shares after: 221,015
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F6

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $548,433
Shares: -3,001
Change %: -1.4%
Price: $182.75
Shares after: 218,014
Date: 02 Jun 2026
Ownership: Direct
Footnotes: F1, F7

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 7 footnotes

Footnote F1

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

Footnote F2

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.

Footnote F3

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.

Footnote F4

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.

Footnote F5

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.

Footnote F6

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.

Footnote F7

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.