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        <curCd>USD</curCd>
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        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Hammond Power Solutions Inc</name>
        <lei>549300OLI26OOKEG5V73</lei>
        <title>Hammond Power Solutions Inc</title>
        <cusip>408549103</cusip>
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          <isin value="CA4085491039"/>
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        <balance>10451.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CA</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>HealthEquity Inc</name>
        <lei>529900LRJU1RAFQHM467</lei>
        <title>HealthEquity Inc</title>
        <cusip>42226A107</cusip>
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          <isin value="US42226A1079"/>
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        <balance>13041.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>IDEXX Laboratories Inc</name>
        <lei>OGMTXK0LUU1HKV2P0J84</lei>
        <title>IDEXX Laboratories Inc</title>
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          <isin value="US45168D1046"/>
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        <balance>3812.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Inspire Medical Systems Inc</name>
        <lei>549300XQQCQ7HCJKTW25</lei>
        <title>Inspire Medical Systems Inc</title>
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          <isin value="US4577301090"/>
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        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Intuit Inc</name>
        <lei>VI90HBPH7XSFMB9E4M29</lei>
        <title>Intuit Inc</title>
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          <isin value="US4612021034"/>
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        <balance>10355.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Lincoln Electric Holdings Inc</name>
        <lei>BIMGBY40SIN95O01BN93</lei>
        <title>Lincoln Electric Holdings Inc</title>
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          <isin value="US5339001068"/>
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        <balance>5569.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Mastercard Inc</name>
        <lei>AR5L2ODV9HN37376R084</lei>
        <title>Mastercard Inc</title>
        <cusip>57636Q104</cusip>
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          <isin value="US57636Q1040"/>
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        <balance>17917.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Microsoft Corp</name>
        <lei>INR2EJN1ERAN0W5ZP974</lei>
        <title>Microsoft Corp</title>
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          <isin value="US5949181045"/>
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        <balance>34214.00000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Modine Manufacturing Co</name>
        <lei>Z35SZFYJR8GZZRSIUU09</lei>
        <title>Modine Manufacturing Co</title>
        <cusip>607828100</cusip>
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          <isin value="US6078281002"/>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Motorola Solutions Inc</name>
        <lei>6S552MUG6KGJVEBSEC55</lei>
        <title>Motorola Solutions Inc</title>
        <cusip>620076307</cusip>
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          <isin value="US6200763075"/>
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        <balance>8482.00000000</balance>
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        <curCd>USD</curCd>
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        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Mueller Industries Inc</name>
        <lei>5493005IZFE4VJLLYG84</lei>
        <title>Mueller Industries Inc</title>
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          <isin value="US6247561029"/>
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        <curCd>USD</curCd>
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        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>NVIDIA Corp</name>
        <lei>549300S4KLFTLO7GSQ80</lei>
        <title>NVIDIA Corp</title>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Oracle Corp</name>
        <lei>1Z4GXXU7ZHVWFCD8TV52</lei>
        <title>Oracle Corp</title>
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        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>PDF Solutions Inc</name>
        <lei>549300GMSP6MROFBI160</lei>
        <title>PDF Solutions Inc</title>
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        <assetCat>EC</assetCat>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Primo Brands Corp</name>
        <lei>254900J0WS4AXV2LAX55</lei>
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        <assetCat>EC</assetCat>
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        <fairValLevel>1</fairValLevel>
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        <name>Pure Storage Inc</name>
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      <invstOrSec>
        <name>Quaker Chemical Corp</name>
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        <title>Quaker Chemical Corp</title>
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        <name>Q2 Holdings Inc</name>
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        <name>Regal Rexnord Corp</name>
        <lei>QH78R09VCJGQKPBPYU33</lei>
        <title>Regal Rexnord Corp</title>
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        <fairValLevel>1</fairValLevel>
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        <name>Rush Street Interactive Inc</name>
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        <name>ServiceNow Inc</name>
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        <title>ServiceNow Inc</title>
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        <name>Simply Good Foods Co/The</name>
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        <name>Champion Homes Inc</name>
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        <title>Champion Homes Inc</title>
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        <assetCat>EC</assetCat>
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        <name>Snowflake Inc</name>
        <lei>254900CJNSY1K7T53Z16</lei>
        <title>Snowflake Inc</title>
        <cusip>833445109</cusip>
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        <pctVal>1.729196668397</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>Fixed Income Clearing Corp</name>
        <lei>549300H47WTHXPU08X20</lei>
        <title>FIXED INC CLEARING CORP.REPO</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="85748R009"/>
        </identifiers>
        <balance>3702661.61000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>3702661.61000000</valUSD>
        <pctVal>1.621092700416</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <clearedCentCparty centralCounterparty="Fixed Income Clearing Corp" isCleared="Y"/>
          <isTriParty>N</isTriParty>
          <repurchaseRt>1.15000000</repurchaseRt>
          <maturityDt>2026-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>3867000.00000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>3776714.84000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>TransUnion</name>
        <lei>549300ZS772LUNUMRB03</lei>
        <title>TransUnion</title>
        <cusip>89400J107</cusip>
        <identifiers>
          <isin value="US89400J1079"/>
        </identifiers>
        <balance>29641.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2541715.75000000</valUSD>
        <pctVal>1.112809455157</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>Twist Bioscience Corp</name>
        <lei>549300T23BL59LCOH584</lei>
        <title>Twist Bioscience Corp</title>
        <cusip>90184D100</cusip>
        <identifiers>
          <isin value="US90184D1000"/>
        </identifiers>
        <balance>36199.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1148232.28000000</valUSD>
        <pctVal>0.502717008344</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>Tyler Technologies Inc</name>
        <lei>25490040SMU4Z8LBCW70</lei>
        <title>Tyler Technologies Inc</title>
        <cusip>902252105</cusip>
        <identifiers>
          <isin value="US9022521051"/>
        </identifiers>
        <balance>4864.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2208012.80000000</valUSD>
        <pctVal>0.966708224926</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>UnitedHealth Group Inc</name>
        <lei>549300GHBMY8T5GXDE41</lei>
        <title>UnitedHealth Group Inc</title>
        <cusip>91324P102</cusip>
        <identifiers>
          <isin value="US91324P1021"/>
        </identifiers>
        <balance>14051.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4638375.61000000</valUSD>
        <pctVal>2.030765334550</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>Walmart Inc</name>
        <lei>Y87794H0US1R65VBXU25</lei>
        <title>Walmart Inc</title>
        <cusip>931142103</cusip>
        <identifiers>
          <isin value="US9311421039"/>
        </identifiers>
        <balance>67833.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>7557274.53000000</valUSD>
        <pctVal>3.308712452290</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>West Pharmaceutical Services Inc</name>
        <lei>5493007NKRGM1RJQ1P16</lei>
        <title>West Pharmaceutical Services Inc</title>
        <cusip>955306105</cusip>
        <identifiers>
          <isin value="US9553061055"/>
        </identifiers>
        <balance>11668.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3210333.52000000</valUSD>
        <pctVal>1.405542494382</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>
    </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>2026-01-15</ncom:dateSigned>
      <ncom:nameOfApplicant>WILLIAM BLAIR FUNDS</ncom:nameOfApplicant>
      <ncom:signature>John Raczek</ncom:signature>
      <ncom:signerName>John Raczek</ncom:signerName>
      <ncom:title>Principal Financial Officer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
