<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001968951</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001795815</issuerCik>
      <issuerName>California BanCorp \ CA</issuerName>
      <secFileNumber>001-41684</secFileNumber>
      <issuerAddress>
        <com:street1>12265 EL CAMINO REAL, SUITE 210</com:street1>
        <com:city>SAN DIEGO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>92130</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>858-847-4787</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Machado Lester</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Morgan Stanley at Work-Shareworks</name>
        <address>
          <com:street1>1500 - 600 3 Ave SW</com:street1>
          <com:city>Calgary,</com:city>
          <com:stateOrCountry>A0</com:stateOrCountry>
          <com:zipCode>T2P 0G5</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>7500</noOfUnitsSold>
      <aggregateMarketValue>158947.61</aggregateMarketValue>
      <noOfUnitsOutstanding>32150541</noOfUnitsOutstanding>
      <approxSaleDate>07/31/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>07/31/2026</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>7500</amountOfSecuritiesAcquired>
      <paymentDate>07/31/2026</paymentDate>
      <natureOfPayment>cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>08/12/2026</noticeDate>
      <signature>Lester Machado</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
