Company: MATV
Filing Date: 2025-03-21
Form Type: DEF 14A
Source: 0001140361-25-009899
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Company: Mativ Holdings, Inc.
Filing Date: 2025-03-21
Form: DEF 14A
Chunk 0
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TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant☐ Check the appropriate box: Preliminary Proxy Statement☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy Statement ☒ Definitive Additional Materials☐ Soliciting Material under §240.14a-12☐ Mativ Holdings, Inc. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box): No fee required. ☒ Fee paid previously with preliminary materials.☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11.☐

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March 21, 2025 TO OUR STOCKHOLDERS: On behalf of the Board of Directors and management of Mativ Holdings, Inc., I cordially invite you to the Annual Meeting of Stockholders on Wednesday, April 30, 2025 at 11:00 a.m. Eastern Time via live audio webcast in a virtual meeting format at www.virtualshareholdermeeting.com/MATV2025. Details about the Annual Meeting and the matters to be acted on at the Annual Meeting are presented in the Notice of Annual Meeting and Proxy Statement that follow. It is important that your stock be represented at the Annual Meeting regardless of the number of shares you hold. Please vote promptly by Internet or by returning a proxy card, whether or not you plan to attend the Annual Meeting. If you do attend the Annual Meeting and wish to change your prior vote, you may do so at that time. Thank you for your support.

| Sincerely,                |
| Kimberly E. Ritrievi, ScD |
| Chair, Board of Directors |

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MATIV HOLDINGS, INC. 100 Kimball Place, Suite 600 Alpharetta, Georgia 30009 NOTICE OF ANNUAL MEETING OF STOCKHOLDERS The Annual Meeting of Stockholders of Mativ Holdings, Inc. will be held via live audio webcast in a virtual meeting format at www.virtualshare