Kimberly A. Fields - 17 Aug 2026 Form 4 Insider Report for ATI INC (ATI)

Reporting relationship: Chair, President and CEO, Director
Issuer ticker: ATI
Reported as of: 17 Aug 2026
Net transaction value: -$5,744,009
SEC form: 4
Accepted by SEC: 19 Aug 2026, 17:05:31 UTC
Prior SEC filing: 30 Jul 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 19 Aug 2026.

Key facts

This page summarizes Kimberly A. Fields's Form 4 filing for ATI INC (ATI).
5 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 19 Aug 2026, 17:05.

Change

Previous filing in this sequence was filed on 30 Jul 2026.
Current net transaction value: -$5,744,009.

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: 19 Aug 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: $228,320
Shares: -1,000
Change %: -0.8%
Price: $228.32
Shares after: 124,564
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F2

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $459,120
Shares: -2,000
Change %: -1.6%
Price: $229.56
Shares after: 122,564
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F3

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $1,875,496
Shares: -8,131
Change %: -6.6%
Price: $230.66
Shares after: 114,433
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F4

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $2,112,360
Shares: -9,116
Change %: -8%
Price: $231.72
Shares after: 105,317
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F5

ATI transaction

Common Stock, par value $0.10 per share

Sale

Transaction value: $1,068,713
Shares: -4,598
Change %: -4.4%
Price: $232.43
Shares after: 100,719
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F6

^* 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 6 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 $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.

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.