Timothy J. Harris - 31 Aug 2026 Form 4 Insider Report for ATI INC (ATI)

Reporting relationship: Senior VP and CDIO
Issuer ticker: ATI
Reported as of: 31 Aug 2026
Net transaction value: -$3,465,165
SEC form: 4
Accepted by SEC: 02 Sep 2026, 17:41:16 UTC
Prior SEC filing: 26 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Amanda J. Skov, Attorney-in-Fact for Timothy J. Harris

Key filing fact

Timothy J. Harris filed Form 4 for ATI INC (ATI) on 02 Sep 2026.

Key facts

This page summarizes Timothy J. Harris's Form 4 filing for ATI INC (ATI).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 02 Sep 2026, 17:41.

Change

Previous filing in this sequence was filed on 26 Aug 2026.
Current net transaction value: -$3,465,165.

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 0001776844 Primary reporting owner

Harris Timothy J

Relationship: Senior VP and CDIO
Address: C/O ATI INC., 2021 MCKINNEY AVE., SUITE 1100, DALLAS
Signature: /s/ Amanda J. Skov, Attorney-in-Fact for Timothy J. Harris
Signature date: 02 Sep 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: $3,465,165
Shares: -16,500
Change %: -11%
Price: $210.01
Shares after: 130,187
Date: 31 Aug 2026
Ownership: Direct
Footnotes: F1

^* 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 1 footnote

Footnote F1

Shares sold pursuant to a 10b5-1 Trading Plan dated May 21, 2026, entered into for personal tax and estate planning purposes.