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            <!-- Field: Pseudo-Tag; ID: Name; Data: ORBIMED ADVISORS LLC -->
            <cik>0001055951</cik>
            <ccc>XXXXXXXX</ccc>
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        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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        <issuerCik>0001664710</issuerCik>
        <issuerName>Keros Therapeutics, Inc.</issuerName>
        <secFileNumber>001-39264</secFileNumber>
        <issuerAddress>
          <com:street1>1050 WALTHAM STREET</com:street1>
          <com:street2>SUITE 302</com:street2>
          <com:city>LEXINGTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02421</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>617-314-6297</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>OrbiMed Private Investments VII, LP</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Shareholder</relationshipToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Morgan Stanley Smith Barney</name>
          <address>
            <com:street1>2000 Westchester Avenue</com:street1>
            <com:city>Purchase</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10577</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>220600</noOfUnitsSold>
        <aggregateMarketValue>9891704.00</aggregateMarketValue>
        <noOfUnitsOutstanding>37522097</noOfUnitsOutstanding>
        <approxSaleDate>08/13/2024</approxSaleDate>
        <securitiesExchangeName>Nasdaq</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>04/13/2020</acquiredDate>
        <natureOfAcquisitionTransaction>IPO</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>220600</amountOfSecuritiesAcquired>
        <paymentDate>04/13/2020</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>OrbiMed Capital GP VII LLC is the general partner of OrbiMed Private Investments VII, LP. OrbiMed Advisors LLC is the managing member of OrbiMed Capital GP VII LLC.</remarks>
      <noticeSignature>
        <noticeDate>08/13/2024</noticeDate>
        <signature>/s/ Douglas Coon, Chief Compliance Officer, OrbiMed Advisors LLC, managing member of the general partner of OrbiMed Private Investments VII, LP</signature>
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text: 144
  0001055951
  XXXXXXXX
  LIVE
  0001664710
  Keros Therapeutics, Inc.
  001-39264
  1050 WALTHAM STREET
  SUITE 302
  LEXINGTON
  MA
  02421
  617-314-6297
  OrbiMed Private Investments VII, LP
  Shareholder
  Director
  Common Stock
  Morgan Stanley Smith Barney
  2000 Westchester Avenue
  Purchase
  NY
  10577
  220600
  9891704.00
  37522097
  08/13/2024
  Nasdaq
  Common Stock
  04/13/2020
  IPO
  Issuer
  N
  220600
  04/13/2020
  Cash
  Y
  OrbiMed Capital GP VII LLC is the general partner of OrbiMed Private Investments VII, LP. OrbiMed Advisors LLC is the managing member of OrbiMed Capital GP VII LLC.
  08/13/2024
  /s/ Douglas Coon, Chief Compliance Officer, OrbiMed Advisors LLC, managing member of the general partner of OrbiMed Private Investments VII, LP