<SEC-DOCUMENT>0000950170-25-061388.txt : 20250430
<SEC-HEADER>0000950170-25-061388.hdr.sgml : 20250430
<ACCEPTANCE-DATETIME>20250430210811
ACCESSION NUMBER:		0000950170-25-061388
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250428
FILED AS OF DATE:		20250430
DATE AS OF CHANGE:		20250430

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lang Matthew
		CENTRAL INDEX KEY:			0001712069
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42489
		FILM NUMBER:		25898920

	MAIL ADDRESS:	
		STREET 1:		C/O MYOVANT SCIENCES INC.
		STREET 2:		2000 SIERRA POINT PARKWAY, 9TH FLOOR
		CITY:			BRISBANE
		STATE:			CA
		ZIP:			94005

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Metsera, Inc.
		CENTRAL INDEX KEY:			0002040807
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3 WORLD TRADE CENTER
		STREET 2:		175 GREENWICH STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10007
		BUSINESS PHONE:		(212) 784-6595

	MAIL ADDRESS:	
		STREET 1:		3 WORLD TRADE CENTER
		STREET 2:		175 GREENWICH STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10007
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>ownership.xml
<DESCRIPTION>3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-04-28</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002040807</issuerCik>
        <issuerName>Metsera, Inc.</issuerName>
        <issuerTradingSymbol>MTSR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001712069</rptOwnerCik>
            <rptOwnerName>Lang Matthew</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O METSERA, INC., 3 WORLD TRADE CENTER</rptOwnerStreet1>
            <rptOwnerStreet2>175 GREENWICH STREET</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10007</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Chief Legal Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.16</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2035-04-14</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>325000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The option was granted on April 15, 2025. The options vest and become exercisable as to 25% of the shares initially subject to the option on the first anniversary of April 14, 2025 and as to 1/48th of the shares initially subject to the option on each monthly anniversary thereafter such that the award is vested in full as of the fourth anniversary of the grant date, in each case, subject to the Reporting Person's continued service through each vesting date.</footnote>
    </footnotes>

    <remarks>The Reporting Person, Matthew Lang, was designated as an officer of Metsera, Inc. pursuant to Rule 16a-1 promulgated under the Securities Exchange Act of 1934, as amended, on April 28, 2025.</remarks>

    <ownerSignature>
        <signatureName>/s/ Matthew Lang</signatureName>
        <signatureDate>2025-04-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
