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  <headerData>
    <submissionType>SCHEDULE 13G/A</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Castle Creek Capital Partners VI, LP -->
          <cik>0001666749</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


    </filerInfo>
  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>1</amendmentNo>
      <securitiesClassTitle>Common Stock, no par value</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>12/31/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001795815</issuerCik>
        <issuerName>California BanCorp \ CA</issuerName>
        <issuerCusip>84252A106</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <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>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(d)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>Castle Creek Capital Partners VI, LP</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>1522105.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>1522105.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>1522105.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>4.7</classPercent>
      <typeOfReportingPerson>PN</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Castle Creek Capital VI LLC</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>1522105.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>1522105.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>1522105.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>4.7</classPercent>
      <typeOfReportingPerson>HC</typeOfReportingPerson>
      <typeOfReportingPerson>OO</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>California BanCorp \ CA</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>12265 El Camino Real, Suite 210 San Diego, CA, 92130</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Castle Creek Capital Partners VI, LP
Castle Creek Capital VI LLC</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>11682 El Camino Real, Suite 320
San Diego, CA 92130</principalBusinessOfficeOrResidenceAddress>
        <citizenship>Delaware</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>Y</notApplicableFlag>
      </item3>
      <item4>
        <amountBeneficiallyOwned>1,522,105</amountBeneficiallyOwned>
        <classPercent>4.7</classPercent>
        <numberOfSharesPersonHas>
          <sharedPowerOrDirectToVote>1,522,105</sharedPowerOrDirectToVote>
          <sharedPowerOrDirectToDispose>1,522,105</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>N</notApplicableFlag>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>Y</notApplicableFlag>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>Y</notApplicableFlag>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>Castle Creek Capital Partners VI, LP</reportingPersonName>
      <signatureDetails>
        <signature>/s/ John Eggemeyer</signature>
        <title>John Eggemeyer, Managing Principal of Castle Creek Capital VI LLC, the general partner of the Reporting Person</title>
        <date>02/10/2026</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Castle Creek Capital VI LLC</reportingPersonName>
      <signatureDetails>
        <signature>/s/ John Eggemeyer</signature>
        <title>John Eggemeyer, Managing Principal</title>
        <date>02/10/2026</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
</edgarSubmission>
