Company: MATV
Filing Date: 2025-03-21
Form Type: DEFA14A
Source: 0001140361-25-009900
Chunk: 0

Company: Mativ Holdings, Inc.
Filing Date: 2025-03-21
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.  )</div>

**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.
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

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. ☐