<SEC-DOCUMENT>0001231919-25-000406.txt : 20251103
<SEC-HEADER>0001231919-25-000406.hdr.sgml : 20251103
<ACCEPTANCE-DATETIME>20251103190819
ACCESSION NUMBER:		0001231919-25-000406
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20251030
FILED AS OF DATE:		20251103
DATE AS OF CHANGE:		20251103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MPM BioVentures 2014, L.P.
		CENTRAL INDEX KEY:			0001609492
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40366
		FILM NUMBER:		251445807

	BUSINESS ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		(617) 425-9200

	MAIL ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MPM BioVentures 2014 (B), L.P.
		CENTRAL INDEX KEY:			0001609493
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40366
		FILM NUMBER:		251445806

	BUSINESS ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		(617) 425-9200

	MAIL ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MPM Asset Management Investors BV2014 LLC
		CENTRAL INDEX KEY:			0001609495
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40366
		FILM NUMBER:		251445803

	BUSINESS ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		(617) 425-9200

	MAIL ADDRESS:	
		STREET 1:		C/O MPM BIOIMPACT
		STREET 2:		399 BOYLSTON STREET, SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MPM BioVentures 2014 LLC
		CENTRAL INDEX KEY:			0001765021
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40366
		FILM NUMBER:		251445805

	BUSINESS ADDRESS:	
		STREET 1:		399 BOYLSTON STREET
		STREET 2:		SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-425-9200

	MAIL ADDRESS:	
		STREET 1:		399 BOYLSTON STREET
		STREET 2:		SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MPM BioVentures 2014 GP LLC
		CENTRAL INDEX KEY:			0001765091
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40366
		FILM NUMBER:		251445804

	BUSINESS ADDRESS:	
		STREET 1:		399 BOYLSTON STREET
		STREET 2:		SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-425-9200

	MAIL ADDRESS:	
		STREET 1:		399 BOYLSTON STREET
		STREET 2:		SUITE 1100
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Werewolf Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001785530
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				823523180
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		200 TALCOTT AVENUE
		STREET 2:		2ND FLOOR
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		617-952-0555

	MAIL ADDRESS:	
		STREET 1:		200 TALCOTT AVENUE
		STREET 2:		2ND FLOOR
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
</SEC-HEADER>
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            <rptOwnerStreet2>399 BOYLSTON STREET, SUITE 1100</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001765091</rptOwnerCik>
            <rptOwnerName>MPM BioVentures 2014 GP LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MPM BIOIMPACT LLC</rptOwnerStreet1>
            <rptOwnerStreet2>399 BOYLSTON STREET, SUITE 1100</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001609495</rptOwnerCik>
            <rptOwnerName>MPM Asset Management Investors BV2014 LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MPM BIOIMPACT LLC</rptOwnerStreet1>
            <rptOwnerStreet2>399 BOYLSTON STREET, SUITE 1100</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>1</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-10-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>86936</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.43</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6355717</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2025-10-31</value>
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                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>114044</value>
                    <footnoteId id="F6"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.28</value>
                    <footnoteId id="F7"/>
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                    <value>D</value>
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                    <value>See Footnote</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-11-03</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>94063</value>
                    <footnoteId id="F9"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.29</value>
                    <footnoteId id="F10"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>6147610</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
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    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated September 24, 2025.</footnote>
        <footnote id="F2">The shares were sold as follows: 5,969 by MPM Asset Management LLC (&quot;AM LLC&quot;), 37,709 by MPM BioVentures 2014, L.P. (&quot;BV 2014&quot;), 2,515 by MPM BioVentures 2014(B), L.P. (BV 2014(B), 1,298 MPM Asset Management Investors BV2014 LLC (&quot;AM
BV2014&quot;), 8,304 by MPM Oncology Innovations Fund, L.P. (&quot;MPM OIF&quot;) and 31,141 by UBS Oncology Impact Fund L.P. (&quot;UBS Oncology&quot;). MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC (&quot;BV LLC&quot;) are the direct and indirect general partners of
BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM Oncology Innovations Fund GP LLC (&quot;MPM OIF GP&quot;) is the general partner of MPM OIF. Ansbert Gadicke is a member of AM LLC, a managing director of BV LLC and a manager of MPM OIF
GP. Each Reporting Person disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest therein.</footnote>
        <footnote id="F3">MPM BioImpact LLC (&quot;BioImpact&quot;) is the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing partner of BioImpact. Each Reporting Person disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest therein.</footnote>
        <footnote id="F4">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.365 to $1.55 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.</footnote>
        <footnote id="F5">The shares are held as follows: 436,489 by AM LLC, 2,756,691 by BV 2014, 183,866 by BV 2014(B), 94,885 by AM BV2014, 604,989 by MPM OIF and 2,278,797 by UBS Oncology.</footnote>
        <footnote id="F6">The shares were sold as follows: 7,830 by AM LLC, 49,467 by BV 2014, 3,299 by BV 2014(B), 1,702 by AM BV2014, 10,894 by MPM OIF and 40,852 by UBS Oncology.</footnote>
        <footnote id="F7">. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.205 to $1.415 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the
Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.</footnote>
        <footnote id="F8">The shares are held as follows: 428,659 by AM LLC, 2,707,224 by BV 2014, 180,567 by BV 2014(B), 93,183 by AM BV2014, 594,095 by MPM OIF and 2,237,945 by UBS Oncology.</footnote>
        <footnote id="F9">The shares were sold as follows: 6,458 by AM LLC, 40,800 by BV 2014, 2,721 by BV 2014(B), 1,405 by AM BV2014, 8,985 by MPM OIF and 33,694 by UBS Oncology.</footnote>
        <footnote id="F10">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.245 to $1.33 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the
Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.</footnote>
        <footnote id="F11">The shares are held as follows: 422,201 by AM LLC, 2,666,424 by BV 2014, 177,846 by BV 2014(B), 91,778 by AM BV2014, 585,110 by MPM OIF and 2,204,251 by UBS Oncology.</footnote>
    </footnotes>

    <remarks>This filing is 1 of 2 identical filings due to limitations on number of Reporting Persons. See Form 4 filed by Ansbert Gadicke.</remarks>

    <ownerSignature>
        <signatureName>/s/ Ansbert Gadicke, Managing Director of MPM BioVentures 2014 LLC</signatureName>
        <signatureDate>2025-11-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ansbert Gadicke, Managing Director of MPM BioVentures 2014 LLC, the manager of MPM Asset Management Investors BV2014 LLC</signatureName>
        <signatureDate>2025-11-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ansbert Gadicke, Managing Director of MPM BioVentures 2014 LLC, the Managing Member of MPM BioVentures 2014 GP LLC, the GP of MPM BioVentures 2014 (B), L.P.</signatureName>
        <signatureDate>2025-11-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ansbert Gadicke, Managing Director of MPM BioVentures 2014 LLC, the Managing Member of MPM BioVentures 2014 GP LLC, the GP of MPM BioVentures 2014, L.P.</signatureName>
        <signatureDate>2025-11-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Ansbert Gadicke, Managing Director of MPM BioVentures 2014 LLC, the Managing Member of MPM BioVentures 2014 GP LLC</signatureName>
        <signatureDate>2025-11-03</signatureDate>
    </ownerSignature>
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