Principal William M. Cook - 01 Jan 2026 Form 4 Insider Report for Mativ Holdings, Inc. (MATV)

Reporting relationship: Director
Issuer ticker: MATV
Reported as of: 01 Jan 2026
Net transaction value: +$13,195
SEC form: 4
Accepted by SEC: 05 Jan 2026, 17:17:15 UTC
Prior SEC filing: 02 Jul 2025
Next SEC filing: 05 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Brian Park, attorney-in-fact for William M. Cook, principal

Key filing fact

Principal William M. Cook filed Form 4 for Mativ Holdings, Inc. (MATV) on 05 Jan 2026.

Key facts

This page summarizes Principal William M. Cook's Form 4 filing for Mativ Holdings, Inc. (MATV).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 05 Jan 2026, 17:17.

Change

Previous filing in this sequence was filed on 02 Jul 2025.
Current net transaction value: +$13,195.

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 0001226577 Primary reporting owner

COOK WILLIAM M

Relationship: Director
Address: MATIV HOLDINGS, 100 KIMBALL PLACE, STE 600, ALPHARETTA
Signature: /s/ Brian Park, attorney-in-fact for William M. Cook, principal
Signature date: 05 Jan 2026

Reported non-derivative transactions

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

MATV holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 26,436
Date: 01 Jan 2026
Ownership: Direct

Reported derivative securities

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

MATV transaction Derivative

Phantom Stock

Award

Transaction value: $3,822
Shares: +306
Change %: +0.54%
Price: $12.49
Shares after: 57,230
Date: 01 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 306
Exercise price: $0.000000
Footnotes: F1, F2

MATV transaction Derivative

Phantom Stock

Award

Transaction value: $9,373
Shares: +793
Change %: +1.4%
Price: $11.82
Shares after: 58,023
Date: 01 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 793
Exercise price: $0.000000
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Represents in-kind dividends credited pursuant to the Director's election under the Non-Employee Directors Deferred Compensation Plan.

Footnote F2

Stock units are converted to stock upon the earlier of retirement from the Board or termination as a Director in accordance with the Company's Non-Employee Directors Deferred Compensation Plan.

Footnote F3

Represents quarterly cash and committee meeting retainers deferred pursuant to the Director's election in accordance with the Non-Employee Directors Deferred Compensation Plan.