<SEC-DOCUMENT>0001664710-17-000002.txt : 20171113
<SEC-HEADER>0001664710-17-000002.hdr.sgml : 20171110
<ACCEPTANCE-DATETIME>20171113135449
ACCESSION NUMBER:		0001664710-17-000002
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		<ITEMS>06b
FILED AS OF DATE:		20171113
DATE AS OF CHANGE:		20171113
EFFECTIVENESS DATE:		20171113

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Keros Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001664710
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-262318
		FILM NUMBER:		171195097

	BUSINESS ADDRESS:	
		STREET 1:		99 HAYDEN AVENUE, SUITE 120 (BLD E)
		STREET 2:		LEDGEMONT TECHNOLOGY CENTER
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
		BUSINESS PHONE:		617-513-8774

	MAIL ADDRESS:	
		STREET 1:		99 HAYDEN AVENUE, SUITE 120 (BLD E)
		STREET 2:		LEDGEMONT TECHNOLOGY CENTER
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001664710</cik>
        <entityName>Keros Therapeutics, Inc.</entityName>
        <issuerAddress>
            <street1>99 HAYDEN AVENUE, SUITE 120 (BLD E)</street1>
            <street2>LEDGEMONT TECHNOLOGY CENTER</street2>
            <city>LEXINGTON</city>
            <stateOrCountry>MA</stateOrCountry>
            <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
            <zipCode>02421</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>617-513-8774</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2015</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jasbir</firstName>
                <middleName>S.</middleName>
                <lastName>Seehra</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Keros Therapeutics, Inc.</street1>
                <street2>99 Hayden Ave., Suite 120 (Bld E)</street2>
                <city>Lexington</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02421</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ohad</firstName>
                <lastName>Hammer</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Keros Therapeutics, Inc.</street1>
                <street2>99 Hayden Ave., Suite 120 (Bld E)</street2>
                <city>Lexington</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02421</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Julius</firstName>
                <lastName>Knowles</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Keros Therapeutics, Inc.</street1>
                <street2>99 Hayden Ave., Suite 120 (Bld E)</street2>
                <city>Lexington</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02421</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Alon</firstName>
                <lastName>Lazarus</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Keros Therapeutics, Inc.</street1>
                <street2>99 Hayden Ave, Suite 120 (Bld E)</street2>
                <city>Lexington</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02421</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ran</firstName>
                <lastName>Nussbaum</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Keros Therapeutics, Inc.</street1>
                <street2>99 Hayden Ave., Suite 120 (Bld E)</street2>
                <city>Lexington</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02421</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Biotechnology</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001664710-16-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2016-04-15</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>11000000</totalOfferingAmount>
            <totalAmountSold>11000000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>7</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Keros Therapeutics, Inc.</issuerName>
                <signatureName>/s/ Jasbir S. Seehra</signatureName>
                <nameOfSigner>Jasbir S. Seehra</nameOfSigner>
                <signatureTitle>President</signatureTitle>
                <signatureDate>2017-11-09</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
