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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <name>Options Clearing Corp.</name>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Baxter International Inc</name>
        <lei>J5OIVXX3P24RJRW5CK77</lei>
        <title>Baxter International Inc</title>
        <cusip>071813109</cusip>
        <identifiers>
          <isin value="US0718131099"/>
        </identifiers>
        <balance>111827.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4535703.12000000</valUSD>
        <pctVal>0.776049166956</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bristol-Myers Squibb Co</name>
        <lei>HLYYNH7UQUORYSJQCN42</lei>
        <title>Bristol-Myers Squibb Co</title>
        <cusip>110122108</cusip>
        <identifiers>
          <isin value="US1101221083"/>
        </identifiers>
        <balance>39106.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2710436.86000000</valUSD>
        <pctVal>0.463749987960</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Insitro, Series C</name>
        <lei>N/A</lei>
        <title>Insitro, Series C</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="BRWH9E7P6"/>
        </identifiers>
        <balance>30616.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>356064.08000000</valUSD>
        <pctVal>0.060921807569</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>Y</isRestrictedSec>

        <fairValLevel>3</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>NOMURA SECURITIES INTERNATIONAL INC</name>
        <lei>OXTKY6Q8X53C9ILVV871</lei>
        <title>MAY23 BMRN US C @ 96.5</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="BRYF2F6M0"/>
        </identifiers>
        <balance>-80.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-40646.80000000</valUSD>
        <pctVal>-0.00695458111</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>NOMURA SECURITIES INTERNATIONAL INC</counterpartyName>
              <counterpartyLei>OXTKY6Q8X53C9ILVV871</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>BioMarin Pharmaceutical, Inc.</issuerName>
                <issueTitle>BioMarin Pharmaceutical, Inc.</issueTitle>
                <identifiers>
                  <cusip value="09061G101"/>
                  <isin value="US09061G1013"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>96.50000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-05-12</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-19545.30000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>UBS AG</name>
        <lei>BFM8T61CT2L1QCEMIK50</lei>
        <title>APR23 BLCO US C @ 17.25</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="BRYDPCTB6"/>
        </identifiers>
        <balance>-8000.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-3382.24000000</valUSD>
        <pctVal>-0.00057869407</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>UBS AG</counterpartyName>
              <counterpartyLei>BFM8T61CT2L1QCEMIK50</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>Bausch &amp; Lomb Corp.</issuerName>
                <issueTitle>Bausch &amp; Lomb Corp.</issueTitle>
                <identifiers>
                  <isin value="CA0717051076"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>1.00000000</shareNo>
            <exercisePrice>17.25000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-04-05</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>6702.55000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>JP MORGAN CHASE BANK</name>
        <lei>7H6GLXDRUGQFU57RNE97</lei>
        <title>MAY23 ALKS US C @ 27.308</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="BRYF2QZR3"/>
        </identifiers>
        <balance>-5900.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-10821.13000000</valUSD>
        <pctVal>-0.00185147235</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>JP MORGAN CHASE BANK</counterpartyName>
              <counterpartyLei>7H6GLXDRUGQFU57RNE97</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>Alkermes PLC</issuerName>
                <issueTitle>Alkermes PLC</issueTitle>
                <identifiers>
                  <isin value="IE00B56GVS15"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>1.00000000</shareNo>
            <exercisePrice>27.30800000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-05-08</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-4624.36000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Gilead Sciences Inc</name>
        <lei>549300WTZWR07K8MNV44</lei>
        <title>Gilead Sciences Inc</title>
        <cusip>375558103</cusip>
        <identifiers>
          <isin value="US3755581036"/>
        </identifiers>
        <balance>172670.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>14326429.90000000</valUSD>
        <pctVal>2.451221716945</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Options Clearing Corp.</name>
        <lei>549300CII6SLYGKNHA04</lei>
        <title>ABBOTT LABORATORIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="Z961KPKP1"/>
        </identifiers>
        <balance>-231.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-69300.00000000</valUSD>
        <pctVal>-0.01185708276</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>Abbott Laboratories</issuerName>
                <issueTitle>Abbott Laboratories</issueTitle>
                <identifiers>
                  <cusip value="002824100"/>
                  <isin value="US0028241000"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>101.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-05-05</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-21074.30000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Options Clearing Corp.</name>
        <lei>549300CII6SLYGKNHA04</lei>
        <title>10X GENOMICS INC</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="Z9607LUR2"/>
        </identifiers>
        <balance>-15.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-10425.00000000</valUSD>
        <pctVal>-0.00178369535</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>10X Genomics, Inc.</issuerName>
                <issueTitle>10X Genomics, Inc.</issueTitle>
                <identifiers>
                  <cusip value="88025U109"/>
                  <isin value="US88025U1097"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>50.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-04-21</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-858.66000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Options Clearing Corp.</name>
        <lei>549300CII6SLYGKNHA04</lei>
        <title>ARGENX SE</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="Z9608MJX9"/>
        </identifiers>
        <balance>-27.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-10057.50000000</valUSD>
        <pctVal>-0.00172081688</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>NL</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>Argenx SE</issuerName>
                <issueTitle>Argenx SE</issueTitle>
                <identifiers>
                  <cusip value="04016X101"/>
                  <isin value="US04016X1019"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>400.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-04-21</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>19029.84000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>NOMURA SECURITIES INTERNATIONAL INC</name>
        <lei>OXTKY6Q8X53C9ILVV871</lei>
        <title>BSX US FLEX</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="BlackRock Identifier" value="BRYDUH9X3"/>
        </identifiers>
        <balance>-111.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-30034.38000000</valUSD>
        <pctVal>-0.00513881860</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>NOMURA SECURITIES INTERNATIONAL INC</counterpartyName>
              <counterpartyLei>OXTKY6Q8X53C9ILVV871</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>Boston Scientific Corp.</issuerName>
                <issueTitle>Boston Scientific Corp.</issueTitle>
                <identifiers>
                  <cusip value="101137107"/>
                  <isin value="US1011371077"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <shareNo>100.00000000</shareNo>
            <exercisePrice>47.74000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2023-04-21</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-12979.52000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>

      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>



    </explntrNotes>
    <signature>
      <ncom:dateSigned>2023-05-01</ncom:dateSigned>
      <ncom:nameOfApplicant>BlackRock Health Sciences Trust</ncom:nameOfApplicant>
      <ncom:signature>Chuck Pulsfort</ncom:signature>
      <ncom:signerName>Chuck Pulsfort</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
