<SEC-DOCUMENT>0001797917-26-000005.txt : 20260706
<SEC-HEADER>0001797917-26-000005.hdr.sgml : 20260706
<ACCEPTANCE-DATETIME>20260706162632
ACCESSION NUMBER:		0001797917-26-000005
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20260701
FILED AS OF DATE:		20260706
DATE AS OF CHANGE:		20260706

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Prener Anne
		CENTRAL INDEX KEY:			0001797917
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39264
		FILM NUMBER:		261156261

	MAIL ADDRESS:	
		STREET 1:		C/O RUBIUS THERAPEUTICS
		STREET 2:		399 BINNEY STREET SUITE 300
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Keros Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001664710
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				811173868
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1050 WALTHAM STREET, SUITE 302
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
		BUSINESS PHONE:		617-314-6297

	MAIL ADDRESS:	
		STREET 1:		1050 WALTHAM STREET, SUITE 302
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>form3-07062026_080729.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-07-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001664710</issuerCik>
        <issuerName>Keros Therapeutics, Inc.</issuerName>
        <issuerTradingSymbol>KROS</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001797917</rptOwnerCik>
            <rptOwnerName>Prener Anne</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O KEROS THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1050 WALTHAM STREET, SUITE 302</rptOwnerStreet2>
            <rptOwnerCity>LEXINGTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02421</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ Esther Cho, Attorney-in-Fact</signatureName>
        <signatureDate>2026-07-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex24-07062026_080733.htm
<TEXT>
<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">
<html><head><title>ex24-07062026_080733.htm</title></head><body style="margin-top:0;font-family:Times New Roman; font-size:10pt; color:#000000">
<p style="margin:0px" align="center"><b>POWER OF ATTORNEY</b></p>
<p style="margin:0px" align="center"><br></p>
<p style="margin:0px" align="center">(For Executing Form ID and Forms 3, 4 and 5)</p>
<p style="margin:0px" align="center"><br></p>
<p style="margin:0px; text-indent:61.067px" align="justify">Know all by these presents, that the undersigned hereby constitutes and appoints each of Jasbir Seehra, Keith Regnante and Esther Cho (the "<b><i>Company</i></b>"), signing individually, the undersigned's true and lawful attorneys-in-fact and agents to:</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:61.067px; width:122.133px; float:left">(1)</p>
<p style="margin:0px; text-indent:-2px" align="justify">prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to the Securities and Exchange Commission (the "<b><i>SEC</i></b>") Forms 3, 4 and 5 (including any amendments thereto) in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended (the "<b><i>Exchange Act</i></b>"), and the rules thereunder in the undersigned's capacity as an officer, director or beneficial owner of more than 10% of a registered class of securities of the Company;</p>
<p style="margin:0px; clear:left" align="justify"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:61.067px; width:122.133px; float:left">(2)</p>
<p style="margin:0px; text-indent:-2px" align="justify">do and perform any and all acts for and on behalf of the undersigned that may be necessary or desirable to execute such Forms 3, 4 or 5 (including amendments thereto) and timely file such forms with the SEC and any stock exchange or any similar authority; and</p>
<p style="margin:0px; clear:left" align="justify"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:61.067px; width:122.133px; float:left">(3)</p>
<p style="margin:0px; text-indent:-2px" align="justify">take any other action of any type whatsoever in connection with the foregoing that, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required of the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in the attorney-in-fact's discretion.</p>
<p style="margin:0px; clear:left" align="justify"><br></p>
<p style="margin:0px; text-indent:61.067px" align="justify">The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. &nbsp;The undersigned acknowledges that the foregoing attorney-in-fact, and their substitutes, in serving in such capacity at the request of the undersigned, are not assuming (nor is the Company assuming) any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act.</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px; text-indent:61.067px" align="justify">This Power of Attorney shall remain in full force and effect until the earliest to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, (b) revocation by the undersigned in a signed writing delivered to the Company and the foregoing attorney-in-fact or (c) as to any attorney-in-fact individually, until such attorney-in-fact is no longer employed by the Company. &nbsp;</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px; text-indent:61.067px" align="justify">IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of the date written below.</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px" align="justify"><br></p>
<table style="margin-top:0px; font-size:10pt" cellpadding="0" cellspacing="0" align="center"><tr style="font-size:0"><td width="43.333"></td><td width="166.667"></td><td width="156.933"></td><td width="257.067"></td></tr><tr><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="43.333"><p style="margin:0px" align="justify">Date: &nbsp;</p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px; border-bottom:1px solid #000000" valign="top" width="166.667"><p style="margin:0px" align="justify">5 July 2026</p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="156.933"><p style="margin:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px; border-bottom:1px solid #000000" valign="top" width="257.067"><p style="margin:0px" align="justify">/s/ Anne Prener</p>
</td></tr><tr><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="43.333"><p style="margin:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="166.667"><p style="margin:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="156.933"><p style="margin:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="257.067"><p style="margin:0px" align="justify">Name: &nbsp;Anne Prener</p>
</td></tr></table><p style="margin:0px" align="justify"><br></p>
<p style="margin:0px" align="justify"><br></p>
</body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
