Mativ Holdings, Inc.

Securities Trading Plans of Directors and Executive Officers

During the fiscal quarter ended September 30, 2025, none of the Company’s directors or executive officers adopted orterminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any "non-Rule 10b5-1 trading arrangement."

Amended Receivables Sales Agreement

On November 5, 2025, the Company entered into that certain Second Omnibus Amendment, dated as of November 5, 2025 to amend (i) the Company’s previously disclosed Receivables Sales Agreement (as amended, the “Amended Receivables Sales Agreement”) and (ii) its previously disclosed Sale and Contribution Agreement, (as amended, the “Amended Sale and Contribution Agreement”) (the “Omnibus Amendment”). Among other things, the Omnibus Amendment (1) extended the term of the Amended Receivables Sales Agreement until November 5, 2026, and (2)

reduced the maximum funding commitment under the Amended Receivables Sales Agreement from $175.0 million to $150.0 million.

The documentation for the Omnibus Amendment includes (i) an amendment to the Receivables Purchase Agreement dated as of November 5, 2025, by and among the Company, Mativ Receivables LLC, a wholly-owned, consolidated, bankruptcy-remote subsidiary of the Company (“Seller”), the persons from time to time party thereto as purchasers (the “Purchasers”), PNC Bank, National Association, as administrative agent (“PNC” or “Administrative Agent”), and PNC Capital Markets LLC, as structuring agent (the “Receivables Purchase Agreement Amendment”) and (ii) an amendment to the Sale and Contribution Agreement, dated as of November 5, 2025, by and among the Company, the originators party thereto, and the Seller. The Amended Receivables Sales Agreement amends the original Receivables Purchase Agreement, dated as of December 23, 2022 (as amended from time to time, the “Amended Receivables Purchase Agreement”) and the Amended Sale and Contribution Agreement Amendment the original Sale and Contribution Agreement, dated as of December 23, 2022.

The Amended Receivables Purchase Agreement and the Amended Sale and Contribution Agreement contain certain customary representations and warranties, affirmative and negative covenants, indemnification provisions, and events of default, including those providing for the acceleration of amounts owed by the Seller to the Purchasers under the Amended Receivables Purchase Agreement upon the occurrence of certain events.

The foregoing summary of the Omnibus Amendment does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the full and complete terms of the Omnibus Amendment, which is included as Exhibit 10.1, respectively, to this Quarterly Form 10-Q and incorporated herein by reference.