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          <ccc>XXXXXXXX</ccc>
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      <regFileNumber>811-05344</regFileNumber>
      <regCik>0000822632</regCik>
      <regLei>SNQR0U5FDV8EZZX4W051</regLei>
      <regStreet1>150 NORTH RIVERSIDE PLAZA</regStreet1>
      <regCity>CHICAGO</regCity>
      <regStateConditional regCountry="US" regState="US-IL"/>
      <regZipOrPostalCode>60606</regZipOrPostalCode>
      <regPhone>312-364-8000</regPhone>
      <seriesName>William Blair Growth Fund</seriesName>
      <seriesId>S000008594</seriesId>
      <seriesLei>549300CN8MT9K8UCDE27</seriesLei>
      <repPdEnd>2020-12-31</repPdEnd>
      <repPdDate>2020-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>1660386.74</totLiabs>
      <netAssets>202525633.42</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
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      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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        <name>Fidelity National Information Services Inc</name>
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      <invstOrSec>
        <name>Linde PLC</name>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Verra Mobility Corp</name>
        <lei>N/A</lei>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Codexis Inc</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Brink's Co/The</name>
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        <name>Pure Storage Inc</name>
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        <name>Booz Allen Hamilton Holding Corp</name>
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        <fairValLevel>1</fairValLevel>
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        <name>FIXED INC CLEARING CORP.REPO</name>
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        <fairValLevel>2</fairValLevel>
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          <transCat>Repurchase</transCat>
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        <name>Knowles Corp</name>
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        <name>Microchip Technology Inc</name>
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        <name>Coca-Cola Co/The</name>
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        <name>Microsoft Corp</name>
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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>Ulta Salon Cosmetics &amp; Fragrance Inc</name>
        <lei>529900CIV6HN8M28YM82</lei>
        <title>Ulta Salon Cosmetics &amp; Fragrance Inc</title>
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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>Trex Co Inc</name>
        <lei>N/A</lei>
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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>Amazon.com Inc</name>
        <lei>ZXTILKJKG63JELOEG630</lei>
        <title>Amazon.com Inc</title>
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          <isin value="US0231351067"/>
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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>Zoetis Inc</name>
        <lei>549300HD9Q1LOC9KLJ48</lei>
        <title>Zoetis Inc</title>
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          <isin value="US98978V1035"/>
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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>Abbott Laboratories</name>
        <lei>HQD377W2YR662HK5JX27</lei>
        <title>Abbott Laboratories</title>
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          <isin value="US0028241000"/>
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        <balance>45337.00000000</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>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Arista Networks Inc</name>
        <lei>635400H1WKBLOQERUU95</lei>
        <title>Arista Networks Inc</title>
        <cusip>040413106</cusip>
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          <isin value="US0404131064"/>
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        <curCd>USD</curCd>
        <valUSD>4243017.40000000</valUSD>
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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>National Instruments Corp</name>
        <lei>549300TP4OOPCYWDUP86</lei>
        <title>National Instruments Corp</title>
        <cusip>636518102</cusip>
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          <isin value="US6365181022"/>
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        <balance>82501.00000000</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>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Grand Canyon Education Inc</name>
        <lei>529900XFER799IYOSW74</lei>
        <title>Grand Canyon Education Inc</title>
        <cusip>38526M106</cusip>
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          <isin value="US38526M1062"/>
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        <balance>19879.00000000</balance>
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        <curCd>USD</curCd>
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        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Penumbra Inc</name>
        <lei>549300RGE06P3ECANU72</lei>
        <title>Penumbra Inc</title>
        <cusip>70975L107</cusip>
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          <isin value="US70975L1070"/>
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        <balance>9097.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>1467619.01000000</valUSD>
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        <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>
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      <invstOrSec>
        <name>Stryker Corp</name>
        <lei>5493002F0SC4JTBU5137</lei>
        <title>Stryker Corp</title>
        <cusip>863667101</cusip>
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          <isin value="US8636671013"/>
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        <balance>13350.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>2222641.50000000</valUSD>
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        <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>
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      <invstOrSec>
        <name>Texas Instruments Inc</name>
        <lei>WDJNR2L6D8RWOEB8T652</lei>
        <title>Texas Instruments Inc</title>
        <cusip>882508104</cusip>
        <identifiers>
          <isin value="US8825081040"/>
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        <balance>44864.00000000</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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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Agilent Technologies Inc</name>
        <lei>QUIX8Y7A2WP0XRMW7G29</lei>
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        <cusip>00846U101</cusip>
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        <balance>46118.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>3302971.16000000</valUSD>
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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>Mastercard Inc</name>
        <lei>AR5L2ODV9HN37376R084</lei>
        <title>Mastercard Inc</title>
        <cusip>57636Q104</cusip>
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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>Horizon Therapeutics Plc</name>
        <lei>N/A</lei>
        <title>Horizon Therapeutics Plc</title>
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        <assetCat>EC</assetCat>
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        <invCountry>IE</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Activision Blizzard Inc</name>
        <lei>549300TPQQDBP9GNOF40</lei>
        <title>Activision Blizzard Inc</title>
        <cusip>00507V109</cusip>
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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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        <name>Take-Two Interactive Software Inc</name>
        <lei>BOMSTHHJK882EWYX3334</lei>
        <title>Take-Two Interactive Software Inc</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>Workday Inc</name>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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        <name>Alphabet Inc</name>
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        <name>Cameco Corp</name>
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        <invCountry>CA</invCountry>
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        <name>SBA Communications Corp</name>
        <lei>5299001HX8ZN8Y8QIT49</lei>
        <title>SBA Communications Corp</title>
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        <name>Alarm.com Holdings Inc</name>
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        <title>Alarm.com Holdings Inc</title>
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        <name>Guidewire Software Inc</name>
        <lei>549300WXSG0J8IXZCK32</lei>
        <title>Guidewire Software Inc</title>
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        <name>Fortive Corp</name>
        <lei>549300MU9YQJYHDQEF63</lei>
        <title>Fortive Corp</title>
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        <assetCat>EC</assetCat>
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        <name>Virtu Financial Inc</name>
        <lei>5493001OPW2K42CH3884</lei>
        <title>Virtu Financial Inc</title>
        <cusip>928254101</cusip>
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        <assetCat>EC</assetCat>
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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>Perspecta Inc</name>
        <lei>549300XIT2GJKMZC0O65</lei>
        <title>Perspecta Inc</title>
        <cusip>715347100</cusip>
        <identifiers>
          <isin value="US7153471005"/>
        </identifiers>
        <balance>133452.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2434164.48000000</valUSD>
        <pctVal>1.201904390518</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>Teleflex Inc</name>
        <lei>UUL85LWXB4NGSWWXIQ25</lei>
        <title>Teleflex Inc</title>
        <cusip>879369106</cusip>
        <identifiers>
          <isin value="US8793691069"/>
        </identifiers>
        <balance>6426.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1881918.36000000</valUSD>
        <pctVal>0.929224774276</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>Ball Corp</name>
        <lei>0BGI85ALH27ZJP15DY16</lei>
        <title>Ball Corp</title>
        <cusip>058498106</cusip>
        <identifiers>
          <isin value="US0584981064"/>
        </identifiers>
        <balance>67716.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4378516.56000000</valUSD>
        <pctVal>2.161956729161</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>Portola Pharmaceuticals Inc</name>
        <lei>549300BM3O4O0CNBGJ64</lei>
        <title>Portola Pharmaceuticals Inc</title>
        <cusip>737010108</cusip>
        <identifiers>
          <isin value="US7370101088"/>
        </identifiers>
        <balance>114264.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>814702.32000000</valUSD>
        <pctVal>0.402271211916</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>Laureate Education Inc</name>
        <lei>5JL7TMOH5TY3IUYSUP91</lei>
        <title>Laureate Education Inc</title>
        <cusip>518613203</cusip>
        <identifiers>
          <isin value="US5186132032"/>
        </identifiers>
        <balance>144142.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1514932.42000000</valUSD>
        <pctVal>0.748020087342</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>BJ's Wholesale Club Holdings Inc</name>
        <lei>549300UCIWH1C93V0J03</lei>
        <title>BJ's Wholesale Club Holdings Inc</title>
        <cusip>05550J101</cusip>
        <identifiers>
          <isin value="US05550J1016"/>
        </identifiers>
        <balance>73253.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1865753.91000000</valUSD>
        <pctVal>0.921243340160</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>Adobe Inc</name>
        <lei>FU4LY2G4933NH2E1CP29</lei>
        <title>Adobe Inc</title>
        <cusip>00724F101</cusip>
        <identifiers>
          <isin value="US00724F1012"/>
        </identifiers>
        <balance>17532.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5579383.68000000</valUSD>
        <pctVal>2.754902471248</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>Costco Wholesale Corp</name>
        <lei>29DX7H14B9S6O3FD6V18</lei>
        <title>Costco Wholesale Corp</title>
        <cusip>22160K105</cusip>
        <identifiers>
          <isin value="US22160K1051"/>
        </identifiers>
        <balance>12458.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3552149.54000000</valUSD>
        <pctVal>1.753925900645</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>Etsy Inc</name>
        <lei>54930089Q7XT501AEA40</lei>
        <title>Etsy Inc</title>
        <cusip>29786A106</cusip>
        <identifiers>
          <isin value="US29786A1060"/>
        </identifiers>
        <balance>21178.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>814082.32000000</valUSD>
        <pctVal>0.401965077828</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>Advance Auto Parts Inc</name>
        <lei>529900UCNQ5H9FSL0Y70</lei>
        <title>Advance Auto Parts Inc</title>
        <cusip>00751Y106</cusip>
        <identifiers>
          <isin value="US00751Y1064"/>
        </identifiers>
        <balance>20456.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1908953.92000000</valUSD>
        <pctVal>0.942573978297</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>Live Nation Entertainment Inc</name>
        <lei>5493007B9BM9ZXJINO78</lei>
        <title>Live Nation Entertainment Inc</title>
        <cusip>538034109</cusip>
        <identifiers>
          <isin value="US5380341090"/>
        </identifiers>
        <balance>33873.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1539866.58000000</valUSD>
        <pctVal>0.760331694312</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>Dolby Laboratories Inc</name>
        <lei>549300X04FB2QPCJ5J24</lei>
        <title>Dolby Laboratories Inc</title>
        <cusip>25659T107</cusip>
        <identifiers>
          <isin value="US25659T1079"/>
        </identifiers>
        <balance>35175.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1906836.75000000</valUSD>
        <pctVal>0.941528594578</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>Estee Lauder Cos Inc/The</name>
        <lei>549300VFZ8XJ9NUPU221</lei>
        <title>Estee Lauder Cos Inc/The</title>
        <cusip>518439104</cusip>
        <identifiers>
          <isin value="US5184391044"/>
        </identifiers>
        <balance>16686.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2658747.24000000</valUSD>
        <pctVal>1.312795420067</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>Advanced Micro Devices Inc</name>
        <lei>R2I72C950HOYXII45366</lei>
        <title>Advanced Micro Devices Inc</title>
        <cusip>007903107</cusip>
        <identifiers>
          <isin value="US0079031078"/>
        </identifiers>
        <balance>73320.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3334593.60000000</valUSD>
        <pctVal>1.646504466466</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>Illumina Inc</name>
        <lei>SQ95QG8SR5Q56LSNF682</lei>
        <title>Illumina Inc</title>
        <cusip>452327109</cusip>
        <identifiers>
          <isin value="US4523271090"/>
        </identifiers>
        <balance>6616.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1806961.92000000</valUSD>
        <pctVal>0.892213933360</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>MongoDB Inc</name>
        <lei>549300TPTG69WKWE1Z37</lei>
        <title>MongoDB Inc</title>
        <cusip>60937P106</cusip>
        <identifiers>
          <isin value="US60937P1066"/>
        </identifiers>
        <balance>8516.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1162774.64000000</valUSD>
        <pctVal>0.574137021751</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>2020-04-30</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>
  <documents>XXXX</documents>
</edgarSubmission>
