Company: MATV
Filing Date: 2025-06-27
Form Type: 11-K
Source: 0001000623-25-000041
Chunk: 1

Company: Mativ Holdings, Inc.
Filing Date: 2025-06-27
Form: 11-K
Chunk 1
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 Supplemental Schedules |

### SIGNATURES
The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, Mativ Holdings, Inc., as Plan Administrator of the Mativ Holdings, Inc. 401(k) Retirement Plan (formerly SWM Retirement Savings Plan II), has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

The Mativ Holdings, Inc. U.S. Benefits Administrative Committee, as Plan Administrator of the Mativ Holdings, Inc. 401(k) Retirement Plan

Date: June 27, 2025

| By: |     | /s/ Kimberly Karsh                                                       |
|     |     | Kimberly Karsh                                                           |
|     |     | Chairperson, Mativ Holdings, Inc. U.S. Benefits Administrative Committee |