<SEC-DOCUMENT>0000902664-25-003402.txt : 20250806
<SEC-HEADER>0000902664-25-003402.hdr.sgml : 20250806
<ACCEPTANCE-DATETIME>20250806190051
ACCESSION NUMBER:		0000902664-25-003402
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250806
DATE AS OF CHANGE:		20250806

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mativ Holdings, Inc.
		CENTRAL INDEX KEY:			0001000623
		STANDARD INDUSTRIAL CLASSIFICATION:	PAPER MILLS [2621]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				621612879
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-48407
		FILM NUMBER:		251191099

	BUSINESS ADDRESS:	
		STREET 1:		100 KIMBALL PLACE
		STREET 2:		SUITE 600
		CITY:			ALPHARETTA
		STATE:			GA
		ZIP:			30009
		BUSINESS PHONE:		8005140186

	MAIL ADDRESS:	
		STREET 1:		100 KIMBALL PLACE
		STREET 2:		SUITE 600
		CITY:			ALPHARETTA
		STATE:			GA
		ZIP:			30009

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SCHWEITZER MAUDUIT INTERNATIONAL INC
		DATE OF NAME CHANGE:	19950914

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Boundary Creek Advisors LP
		CENTRAL INDEX KEY:			0001771944
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		340 MADISON AVENUE, 12TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10173
		BUSINESS PHONE:		212-503-6260

	MAIL ADDRESS:	
		STREET 1:		340 MADISON AVENUE, 12TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10173
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13g" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0000902664-24-001619</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Boundary Creek Advisors LP -->
          <cik>0001771944</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>2</amendmentNo>
      <securitiesClassTitle>Common Stock, par value $0.10 per share</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>06/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001000623</issuerCik>
        <issuerName>Mativ Holdings, Inc.</issuerName>
        <issuerCusip>808541106</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>100 KIMBALL PLACE</com:street1>
          <com:street2>SUITE 600</com:street2>
          <com:city>ALPHARETTA</com:city>
          <com:stateOrCountry>GA</com:stateOrCountry>
          <com:zipCode>30009</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>Boundary Creek Advisors LP</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>2188984.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>2188984.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2188984.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>4.0</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
      <typeOfReportingPerson>PN</typeOfReportingPerson>
      <comments>Includes 875,000 shares of Common Stock (as defined in Item 2(a)) underlying call options</comments>
    </coverPageHeaderReportingPersonDetails>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Peter Greatrex</reportingPersonName>
      <citizenshipOrOrganization>X1</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>2188984.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>2188984.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2188984.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>4.0</classPercent>
      <typeOfReportingPerson>HC</typeOfReportingPerson>
      <typeOfReportingPerson>IN</typeOfReportingPerson>
      <comments>Includes 875,000 shares of Common Stock underlying call options</comments>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>Mativ Holdings, Inc.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>100 Kimball Place, Suite 600 Alpharetta, GA 30009</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>This statement is filed by:

(i) Boundary Creek Advisors LP (the "Investment Manager"), a Delaware limited partnership, and the investment adviser to Boundary Creek Master Fund LP (the "Boundary Creek Fund"), with respect to the shares of common stock, par value $0.10 per share (the "Common Stock") of Mativ Holdings, Inc. (the "Company") directly held by (and underlying call options directly held by) the Boundary Creek Fund; and

(ii) Mr. Peter Greatrex  ("Mr. Greatrex"), the managing member of Boundary Creek Partners LLC, the general partner of the Investment Manager, with respect to the shares of Common Stock directly held by (and underlying call options directly held by) the Boundary Creek Fund.

The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."

The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the shares of Common Stock reported herein.</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>The address of the business office of each of the Reporting Persons is 340 Madison Avenue, 12th Floor, New York, NY 10173.</principalBusinessOfficeOrResidenceAddress>
        <citizenship>The Investment Manager is a Delaware limited partnership. Mr. Greatrex is a citizen of the United States.</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
        <typeOfPersonFiling>HC</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.

The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 54,632,920 shares of Common Stock outstanding as of May 5, 2025, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025, filed with the Securities and Exchange Commission on May 8, 2025.</amountBeneficiallyOwned>
        <classPercent>4.0%</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>N</notApplicableFlag>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>N</notApplicableFlag>
        <ownershipMoreThan5PercentOnBehalfOfAnotherPerson>See Item 2(a). The Boundary Creek Fund has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock reported herein.</ownershipMoreThan5PercentOnBehalfOfAnotherPerson>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>Boundary Creek Advisors LP</reportingPersonName>
      <signatureDetails>
        <signature>/s/ David O'Mara</signature>
        <title>David O'Mara, General Counsel &amp; Chief Compliance Officer, By: Boundary Creek Partners LLC, General Partner</title>
        <date>08/06/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Peter Greatrex</reportingPersonName>
      <signatureDetails>
        <signature>/s/ Peter Greatrex</signature>
        <title>Peter Greatrex, Individually</title>
        <date>08/06/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
