Robert S. Wetherbee - 05 Jan 2026 Form 4 Insider Report for ATI INC (ATI)

Reporting relationship: Executive Chairman, Director
Issuer ticker: ATI
Reported as of: 05 Jan 2026
Net transaction value: -$19,166,601
SEC form: 4
Accepted by SEC: 07 Jan 2026, 17:25:58 UTC
Prior SEC filing: 19 Dec 2025
Next SEC filing: 15 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Amanda J. Skov, Attorney-in-Fact for Robert S. Wetherbee

Key filing fact

Robert S. Wetherbee filed Form 4 for ATI INC (ATI) on 07 Jan 2026.

Key facts

This page summarizes Robert S. Wetherbee's Form 4 filing for ATI INC (ATI).
6 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 07 Jan 2026, 17:25.

Change

Previous filing in this sequence was filed on 19 Dec 2025.
Current net transaction value: -$19,166,601.

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 0001572385 Primary reporting owner

WETHERBEE ROBERT S

Relationship: Executive Chairman, Director
Address: 2021 MCKINNEY AVENUE, SUITE 1100, DALLAS
Signature: /s/ Amanda J. Skov, Attorney-in-Fact for Robert S. Wetherbee
Signature date: 07 Jan 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

Options Exercise

Transaction value: $0
Shares: +362,644
Change %
Price: $0.000000
Shares after: 186,538
Date: 05 Jan 2026
Ownership: Direct
Footnotes: F1

ATI transaction

Common Stock, par value $0.10 per share

Tax liability

Transaction value: $8,399,199
Shares: -69,369
Change %: -19%
Price: $121.08
Shares after: 293,275
Date: 05 Jan 2026
Ownership: Direct
Footnotes: F2, F7

ATI transaction

Common Stock, par value $0.10 per share

Award

Transaction value: $0
Shares: +185,276
Change %: +63%
Price: $0.000000
Shares after: 478,551
Date: 05 Jan 2026
Ownership: Direct
Footnotes: F3, F4

ATI transaction

Common Stock, par value $0.10 per share

Tax liability

Transaction value: $8,827,580
Shares: -72,907
Change %: -15%
Price: $121.08
Shares after: 405,644
Date: 05 Jan 2026
Ownership: Direct
Footnotes: F2, F5

ATI transaction

Common Stock, par value $0.10 per share

Tax liability

Transaction value: $1,939,823
Shares: -16,021
Change %: -3.9%
Price: $121.08
Shares after: 389,623
Date: 05 Jan 2026
Ownership: Direct
Footnotes: F2, F6

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ATI transaction Derivative

Performance Stock Unit

Options Exercise

Transaction value: $0
Shares: -64,103
Change %: -50%
Price: $0.000000
Shares after: 64,102
Date: 05 Jan 2026
Ownership: Direct
Underlying class: Common Stock, par value $0.10 per share
Underlying amount: 176,106
Exercise price: $0.000000
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 7 footnotes

Footnote F1

Settlement of one-half of certain Performance Stock Units awarded in 2022 ("2022 Breakout Performance Units"), each of which represented a contingent right to receive shares of the Issuer's Common Stock if the Issuer's Common Stock achieved specified target market prices (based on a 20-trading day average) on the New York Stock Exchange ("NYSE") for at least 20 consecutive trading days (the "20-day Average Market Price") prior to December 31, 2025, up to a maximum of three shares per Unit. The shares underlying one-half of the 2022 Breakout Performance Units became payable as of January 5, 2026 following certification of the Issuer's achievement of the relevant performance criteria by the Compensation and Leadership Development Committee of the Company's Board of Directors (the "CLDC"). The remaining half of the 2022 Breakout Performance Units are scheduled by their terms to become payable in early 2027.

Footnote F2

Represents the average of the high and low trading prices for one share of the Issuer's Common Stock on the NYSE on January 5, 2026.

Footnote F3

Settlement of performance-vested restricted stock units that were granted in 2023, the vesting of which was contingent on the Issuer's total shareholder return relative to a specified peer group during the period from January 1, 2023 through December 31, 2025 (the "2023-2025 PSUs"). The shares underlying the 2023-2025 PSUs became payable as of January 5, 2026 following certification of the Issuer's achievement of the relevant performance criteria by the CLDC.

Footnote F4

Awarded under the Issuer's 2022 Incentive Plan.

Footnote F5

Shares withheld for the payment of taxes in connection with the settlement of the 2023-2025 PSUs.

Footnote F6

Shares withheld for payment of taxes on restricted stock units awarded in 2023, 2024 and 2025.

Footnote F7

Shares withheld for the payment of taxes in connection with the settlement of 2022 Breakout Performance Units.