<SEC-DOCUMENT>0001193125-25-320841.txt : 20251216
<SEC-HEADER>0001193125-25-320841.hdr.sgml : 20251216
<ACCEPTANCE-DATETIME>20251216160507
ACCESSION NUMBER:		0001193125-25-320841
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20251215
FILED AS OF DATE:		20251216
DATE AS OF CHANGE:		20251216

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Dolan Oliver
		CENTRAL INDEX KEY:			0002053835
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39062
		FILM NUMBER:		251575181

	MAIL ADDRESS:	
		STREET 1:		C/O KORRO BIO, INC.
		STREET 2:		60 FIRST STREET, 2ND FLOOR, SUITE 250
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			CAMBRIDGE

ISSUER:		

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

	BUSINESS ADDRESS:	
		STREET 1:		60 FIRST STREET
		STREET 2:		2ND FLOOR, SUITE 250
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02141
		BUSINESS PHONE:		617-468-1999

	MAIL ADDRESS:	
		STREET 1:		60 FIRST STREET
		STREET 2:		2ND FLOOR, SUITE 250
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02141

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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-12-15</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002053835</rptOwnerCik>
            <rptOwnerName>Dolan Oliver</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KORRO BIO, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>60 FIRST STREET, 2ND FLOOR, SUITE 250</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02141</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Senior Vice President, Finance</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2025-12-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>21482</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21482</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock issuable upon settlement of a restricted stock unit (RSU) granted under the Issuer's 2023 Stock Option and Incentive Plan (the 2023 Plan) that will vest as follows: 50% on June 15, 2026 and 50% on December 15, 2026, in each case subject to the reporting person maintaining a continuous Service Relationship (as defined in the 2023 Plan) through each such date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Cerio, Attorney-in-fact</signatureName>
        <signatureDate>2025-12-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
