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

Reporting relationship: Director
Issuer ticker: MATV
Reported as of: 01 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jul 2026, 20:16:26 UTC
Prior 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 06 Jul 2026.

Key facts

This page summarizes Principal William M. Cook's Form 4 filing for Mativ Holdings, Inc. (MATV).
4 reported transactions and 4 derivative rows are listed below.
Accepted by SEC: 06 Jul 2026, 20:16.

Change

Previous filing in this sequence was filed on 05 Mar 2026.
Current net transaction value: $0.

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: C/O MATIV HOLDINGS, INC,, 100 KIMBALL PLACE, STE 600, ALPHARETTA
Signature: /s/ Brian Park, attorney-in-fact for William M. Cook, principal
Signature date: 06 Jul 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 Jul 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
Shares: +1,075
Change %: +1.9%
Price
Shares after: 59,098
Date: 01 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,075
Exercise price
Footnotes: F1, F2

MATV transaction Derivative

Phantom Stock

Award

Transaction value
Shares: +658
Change %: +1.1%
Price
Shares after: 59,756
Date: 01 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 658
Exercise price
Footnotes: F2, F3

MATV transaction Derivative

Phantom Stock

Award

Transaction value
Shares: +968
Change %: +1.6%
Price
Shares after: 60,724
Date: 01 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 968
Exercise price
Footnotes: F2, F4

MATV transaction Derivative

Phantom Stock

Award

Transaction value
Shares: +19,815
Change %: +33%
Price
Shares after: 80,539
Date: 01 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 19,815
Exercise price
Footnotes: F2, F5

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Represents quarterly meeting and committee retainers deferred pursuant to the Director's election in accordance with 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 net reinvested dividends on deferred shares after accounting adjustments related to non-employee director compensation program

Footnote F4

Represent reinvested dividend equivalents on vested RSUs.

Footnote F5

Represents an annual stock retainer pursuant to the Company's Outside Director Stock Plan. Deferred pursuant to the Director's election in accordance with the Company's Non-Employee Directors Deferred Compensation Plan.