WILLIAM M. COOK - 01 Jan 2026 Form 4 Insider Report for Mativ Holdings, Inc. (MATV)

Role: Director
Signature: /s/ Brian Park, attorney-in-fact for William M. Cook, principal
Issuer symbol: MATV
Transactions as of: 01 Jan 2026
Net transactions value: +$13,195
Form type: 4
Filing time: 05 Jan 2026, 17:17:15 UTC
Previous filing: 02 Jul 2025
Next filing: 05 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
COOK WILLIAM M	Director	MATIV HOLDINGS, 100 KIMBALL PLACE, STE 600, ALPHARETTA	/s/ Brian Park, attorney-in-fact for William M. Cook, principal	05 Jan 2026	0001226577

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	MATV	Common Stock						26,436	01 Jan 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MATV	Phantom Stock	Award	$3,822	+306	+0.54%	$12.49	57,230	01 Jan 2026	Common Stock	306	$0.000000	Direct	F1, F2
transaction	MATV	Phantom Stock	Award	$9,373	+793	+1.4%	$11.82	58,023	01 Jan 2026	Common Stock	793	$0.000000	Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents in-kind dividends credited pursuant to the Director's election under the Non-Employee Directors Deferred Compensation Plan.
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.
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.