<SEC-DOCUMENT>0000938206-25-000050.txt : 20251114
<SEC-HEADER>0000938206-25-000050.hdr.sgml : 20251114
<ACCEPTANCE-DATETIME>20251114085234
ACCESSION NUMBER:		0000938206-25-000050
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251114
DATE AS OF CHANGE:		20251114

SUBJECT COMPANY:	

	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

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91158
		FILM NUMBER:		251481535

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DRIEHAUS CAPITAL MANAGEMENT LLC
		CENTRAL INDEX KEY:			0000938206
		ORGANIZATION NAME:           	
		EIN:				203634295
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		25 EAST ERIE ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60611
		BUSINESS PHONE:		3125873800

	MAIL ADDRESS:	
		STREET 1:		25 EAST ERIE ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60611

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DRIEHAUS CAPITAL MANAGEMENT INC
		DATE OF NAME CHANGE:	19950216
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13g" xmlns:com="http://www.sec.gov/edgar/common">
<headerData>
<submissionType>SCHEDULE 13G/A</submissionType>
<filerInfo>
<filer>
<filerCredentials>
<cik>0000938206</cik>
<ccc>XXXXXXXX</ccc>
</filerCredentials>
</filer>
<liveTestFlag>LIVE</liveTestFlag>



</filerInfo>
</headerData>
<formData>
<coverPageHeader>
<amendmentNo>1</amendmentNo>
<securitiesClassTitle>Common Stock</securitiesClassTitle>
<eventDateRequiresFilingThisStatement>09/30/2025</eventDateRequiresFilingThisStatement>
<issuerInfo>
<issuerCik>0001703647</issuerCik>
<issuerName>Korro Bio, Inc.</issuerName>
<issuerCusip>500946108</issuerCusip>
<issuerPrincipalExecutiveOfficeAddress>
<com:street1>60 First Street, 2nd Floor, Suite 250</com:street1>
<com:city>Cambridge</com:city>
<com:stateOrCountry>MA</com:stateOrCountry>
<com:zipCode>02141</com:zipCode>
</issuerPrincipalExecutiveOfficeAddress>
</issuerInfo>
<designateRulesPursuantThisScheduleFiled>
<designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
</designateRulesPursuantThisScheduleFiled>
</coverPageHeader>
<coverPageHeaderReportingPersonDetails>

<reportingPersonName>DRIEHAUS CAPITAL MANAGEMENT LLC</reportingPersonName>
<citizenshipOrOrganization>DE</citizenshipOrOrganization>
<reportingPersonBeneficiallyOwnedNumberOfShares>
<soleVotingPower>0</soleVotingPower>
<sharedVotingPower>671981</sharedVotingPower>
<soleDispositivePower>0</soleDispositivePower>
<sharedDispositivePower>671981</sharedDispositivePower>
</reportingPersonBeneficiallyOwnedNumberOfShares>
<reportingPersonBeneficiallyOwnedAggregateNumberOfShares>671981</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
<aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
<classPercent>7.16</classPercent>
<typeOfReportingPerson>IA</typeOfReportingPerson>
<comments>This amendment is filed to reflect the change in our percentage of ownership of Korro Bio, Inc. (KRRO). DCM owned 7.16% of KRRO as of 9/30/2025, up from 5.28% as of 12/31/2024.</comments>
</coverPageHeaderReportingPersonDetails>
<items>
<item1>
<issuerName>Korro Bio, Inc.</issuerName>
<issuerPrincipalExecutiveOfficeAddress>60 First Street, 2nd Floor, Suite 250, Cambridge, Massachusetts, 02141</issuerPrincipalExecutiveOfficeAddress>
</item1>
<item2>
<filingPersonName>Driehaus Capital Management LLC</filingPersonName>
<principalBusinessOfficeOrResidenceAddress>25 East Erie Street, Chicago, Illinois 60611</principalBusinessOfficeOrResidenceAddress>
<citizenship>USA</citizenship>
</item2>
<item3>
<notApplicableFlag>N</notApplicableFlag>
<typeOfPersonFiling>IA</typeOfPersonFiling>
</item3>
<item4>
<amountBeneficiallyOwned>671981</amountBeneficiallyOwned>
<classPercent>7.16</classPercent>
<numberOfSharesPersonHas>
<solePowerOrDirectToVote>0</solePowerOrDirectToVote>
<sharedPowerOrDirectToVote>671981</sharedPowerOrDirectToVote>
<solePowerOrDirectToDispose>0</solePowerOrDirectToDispose>
<sharedPowerOrDirectToDispose>671981</sharedPowerOrDirectToDispose>
</numberOfSharesPersonHas>
</item4>
<item5>
<notApplicableFlag>Y</notApplicableFlag>
</item5>
<item6>
<notApplicableFlag>N</notApplicableFlag>
<ownershipMoreThan5PercentOnBehalfOfAnotherPerson>The shares reported by Driehaus Capital Management LLC (DCM) are held by numerous clients on a fully discretionary basis in accounts managed by DCM. Securities held in these clients' accounts are included in this report to reflect that DCM may have voting power and has dispositive power. To the best of DCM's knowledge, none of the referenced clients have the right to receive dividends or direct proceeds from the sale of interests relating to more than 5% of the class.</ownershipMoreThan5PercentOnBehalfOfAnotherPerson>
</item6>
<item7>
<notApplicableFlag>Y</notApplicableFlag>
</item7>
<item8>
<notApplicableFlag>Y</notApplicableFlag>
</item8>
<item9>
<notApplicableFlag>Y</notApplicableFlag>
</item9>
<item10>
<notApplicableFlag>N</notApplicableFlag>
<certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
</item10>
</items>
<signatureInformation>
<reportingPersonName>DRIEHAUS CAPITAL MANAGEMENT LLC</reportingPersonName>
<signatureDetails>
<signature>Janet McWilliams</signature>
<title>Janet McWilliams, General Counsel</title>
<date>11/14/2025</date>
</signatureDetails>
</signatureInformation>
</formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
