Item 5.03

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On September 21, 2023, in connection with the universal proxy rules adopted by the U.S. Securities and Exchange Commission and related requirements and a periodic review of the By-Laws(the "By-Laws")of Mativ Holdings, Inc. (the "Company"), the Board of Directors (the "Board") of the Company amended and restated the Company's By-Laws,effective as of the same date. The amendments, among other matters:

require any stockholder submitting a nomination notice to make a representation that such stockholder intends to solicit proxies in support of its nominees from the holders of at least 67% of the outstanding shares of the Company's common stock in compliance with Rule 14a-19 underthe Securities Exchange Act of 1934, as amended;

require any stockholder directly or indirectly soliciting proxies from other stockholders to use a proxy card color other than white;

require the inclusion of certain additional information from a stockholder submitting a nomination or a proposal, as well as updates to this information prior to any stockholder meeting;

authorize the chairman of stockholder meetings to adjourn a stockholder meeting, whether or not a quorum is present; and

make various other conforming, technical and ministerial changes.

The foregoing summary description of the amendments to the By-Lawsis qualified in its entirety by reference to the complete text of the By-Laws,a copy of which is filed as Exhibit 3.1 hereto and is incorporated herein by reference.

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Mativ Holdings Inc published this content on 22 September 2023 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 25 September 2023 02:17:20 UTC.