<SEC-DOCUMENT>0001085146-25-004737.txt : 20250808
<SEC-HEADER>0001085146-25-004737.hdr.sgml : 20250808
<ACCEPTANCE-DATETIME>20250808150013
ACCESSION NUMBER:		0001085146-25-004737
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250808
DATE AS OF CHANGE:		20250808

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MasterBrand, Inc.
		CENTRAL INDEX KEY:			0001941365
		STANDARD INDUSTRIAL CLASSIFICATION:	WOOD HOUSEHOLD FURNITURE, (NO UPHOLSTERED) [2511]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				883479920
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1228

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-93854
		FILM NUMBER:		251197985

	BUSINESS ADDRESS:	
		STREET 1:		3300 ENTERPRISE PARKWAY, SUITE 300
		CITY:			BEACHWOOD
		STATE:			OH
		ZIP:			44122
		BUSINESS PHONE:		1-877-622-4782

	MAIL ADDRESS:	
		STREET 1:		3300 ENTERPRISE PARKWAY, SUITE 300
		CITY:			BEACHWOOD
		STATE:			OH
		ZIP:			44122

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Boston Partners
		CENTRAL INDEX KEY:			0001386060
		ORGANIZATION NAME:           	
		EIN:				980202744
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		ONE BEACON STREET
		STREET 2:		30TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108
		BUSINESS PHONE:		2129089500

	MAIL ADDRESS:	
		STREET 1:		ONE BEACON STREET
		STREET 2:		30TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02108

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Robeco Investment Management, Inc.
		DATE OF NAME CHANGE:	20070111
</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:ns1="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>SCHEDULE 13G/A</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001386060</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>1</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>06/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001941365</issuerCik>
        <issuerName>MASTERBRAND INC</issuerName>
        <issuerCusip>57638P104</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <ns1:street1>3300 ENTERPRISE PARKWAY</ns1:street1>
          <ns1:street2>SUITE 300</ns1:street2>
          <ns1:city>BEACHWOOD</ns1:city>
          <ns1:stateOrCountry>OH</ns1:stateOrCountry>
          <ns1:zipCode>44122</ns1:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>Boston Partners</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>7362454</soleVotingPower>
        <sharedVotingPower>0</sharedVotingPower>
        <soleDispositivePower>7931062</soleDispositivePower>
        <sharedDispositivePower>0</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>7931062</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>6.26</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>MASTERBRAND INC</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>3300 ENTERPRISE PARKWAY, SUITE 300, BEACHWOOD, OHIO
44122</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Boston Partners</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>ONE BEACON STREET
30TH FLOOR
BOSTON, Massachusetts
02108</principalBusinessOfficeOrResidenceAddress>
        <citizenship>Boston Partners - DELAWARE</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>7,931,062</amountBeneficiallyOwned>
        <classPercent>6.26</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>Boston Partners - 7,362,454</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>Boston Partners - 0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>Boston Partners - 7,931,062</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>Boston Partners - 0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>Y</notApplicableFlag>
      </item5>
      <item6>
        <notApplicableFlag>N</notApplicableFlag>
        <ownershipMoreThan5PercentOnBehalfOfAnotherPerson>This Schedule is being filed with respect to 7,931,062.00 shares of Master Brand, Inc. (the Common Stock) held by Boston Partners on 6/30/2025 for the discretionary account of certain clients. By reason of rule 13d-3 under the act Boston Partners may be deemed to be a beneficial owner of such Common Stock. To the knowledge of Boston Partners no person has the right to receive or the power to direct the receipt of dividends from or the proceeds from the sale of such Common Stock which represents more than 5% of the outstanding shares of the Common Stock referred to in item 4(b) hereof.</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>Boston Partners</reportingPersonName>
      <signatureDetails>
        <signature>/s/Akiko Lindholm</signature>
        <title>Senior Compliance Officer</title>
        <date>08/08/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
