<SEC-DOCUMENT>0001415889-24-011388.txt : 20240423
<SEC-HEADER>0001415889-24-011388.hdr.sgml : 20240423
<ACCEPTANCE-DATETIME>20240423172547
ACCESSION NUMBER:		0001415889-24-011388
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20240422
FILED AS OF DATE:		20240423
DATE AS OF CHANGE:		20240423

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FORMELA JEAN FRANCOIS
		CENTRAL INDEX KEY:			0001030575
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39062
		FILM NUMBER:		24866018

	MAIL ADDRESS:	
		STREET 1:		C/O ATLAS VENTURE
		STREET 2:		890 WINTER STREET
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Korro Bio, Inc.
		CENTRAL INDEX KEY:			0001703647
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				472324450
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE KENDALL SQUARE. BUILDING 600-700
		STREET 2:		SUITE 6-401
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		617-468-1999

	MAIL ADDRESS:	
		STREET 1:		ONE KENDALL SQUARE. BUILDING 600-700
		STREET 2:		SUITE 6-401
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Frequency Therapeutics, Inc.
		DATE OF NAME CHANGE:	20170412
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4-04232024_090441.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-04-22</periodOfReport>

    <issuer>
        <issuerCik>0001703647</issuerCik>
        <issuerName>Korro Bio, Inc.</issuerName>
        <issuerTradingSymbol>KRRO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001030575</rptOwnerCik>
            <rptOwnerName>FORMELA JEAN FRANCOIS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KORRO BIO, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE KENDALL SQUARE, BUILDING 600-700</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02139</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-04-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>17857</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>56</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>195074</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>942075</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">These shares are held directly by Atlas Venture Opportunity Fund II, L.P. (&quot;AVOF II&quot;). Atlas Venture Associates Opportunity II, L.P. (&quot;AVAO II LP&quot;) is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (&quot;AVAO II LLC&quot;) is the general partner of AVAO II LP. The Reporting Person is a member of AVAO II LLC and disclaims Section 16 beneficial ownership of such shares, except to the extent of his pecuniary interest therein, if any.</footnote>
        <footnote id="F2">These shares are held directly by Atlas Venture Fund XI, L.P. (&quot;Atlas XI&quot;). Atlas Venture Associates XI, L.P. (&quot;AVA XI LP&quot;) is the general partner of Atlas XI. Atlas Venture Associates XI, LLC (&quot;AVA XI LLC&quot;) is the general partner of AVA XI LP. The Reporting Person is a member of AVA XI LLC and disclaims Section 16 beneficial ownership of such shares, except to the extent of his pecuniary interest therein, if any.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Ommer Chohan, Attorney-in-fact</signatureName>
        <signatureDate>2024-04-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
