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      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001997910</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
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      <issuerInfo>
        <issuerCik>0001703647</issuerCik>
        <issuerName>Korro Bio, Inc.</issuerName>
        <secFileNumber>001-39062</secFileNumber>
        <issuerAddress>
          <com:street1>60 FIRST STREET</com:street1>
          <com:street2>2ND FLOOR, SUITE 250</com:street2>
          <com:city>CAMBRIDGE</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02141</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>617-468-1999</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Colletti Steve</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>10303</noOfUnitsSold>
        <aggregateMarketValue>507325.52</aggregateMarketValue>
        <noOfUnitsOutstanding>9298815</noOfUnitsOutstanding>
        <approxSaleDate>08/30/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 11/03/2023</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>5746</amountOfSecuritiesAcquired>
        <paymentDate>08/30/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/30/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 04/11/2023</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4557</amountOfSecuritiesAcquired>
        <paymentDate>08/30/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/30/2024</noticeDate>
        <signature>/s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Steven Colletti</signature>
      </noticeSignature>
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text: 144
  0001997910
  XXXXXXXX
  LIVE
  0001703647
  Korro Bio, Inc.
  001-39062
  60 FIRST STREET
  2ND FLOOR, SUITE 250
  CAMBRIDGE
  MA
  02141
  617-468-1999
  Colletti Steve
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  10303
  507325.52
  9298815
  08/30/2024
  NASDAQ
  Common
  08/30/2024
  Option Granted - 11/03/2023
  Issuer
  N
  5746
  08/30/2024
  Cash
  Common
  08/30/2024
  Option Granted - 04/11/2023
  Issuer
  N
  4557
  08/30/2024
  Cash
  Y
  08/30/2024
  /s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Steven Colletti