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        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>S&amp;P Global Inc</name>
        <lei>Y6X4K52KMJMZE7I7MY94</lei>
        <title>S&amp;P Global Inc</title>
        <cusip>78409V104</cusip>
        <identifiers>
          <isin value="US78409V1044"/>
          <ticker value="SPGI"/>
          <other otherDesc="SEDOL" value="BYV2325"/>
        </identifiers>
        <balance>11018.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4139462.6000000000</valUSD>
        <pctVal>2.5115705180</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>salesforce.com Inc</name>
        <lei>RCGZFPDMRW58VJ54VR07</lei>
        <title>salesforce.com Inc</title>
        <cusip>79466L302</cusip>
        <identifiers>
          <isin value="US79466L3024"/>
          <ticker value="CRM"/>
          <other otherDesc="SEDOL" value="2310525"/>
        </identifiers>
        <balance>15858.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3338584.7400000000</valUSD>
        <pctVal>2.0256472434</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>Ascendis Pharma A/S</name>
        <lei>549300B66JN3W3J8GH73</lei>
        <title>Ascendis Pharma A/S</title>
        <cusip>04351P101</cusip>
        <identifiers>
          <isin value="US04351P1012"/>
          <ticker value="ASND"/>
          <other otherDesc="SEDOL" value="BV9G6B8"/>
        </identifiers>
        <balance>11116.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1249327.2400000000</valUSD>
        <pctVal>0.7580146909</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>DK</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bill.com Holdings Inc</name>
        <lei>549300IBF9VZZIGOZW63</lei>
        <title>Bill.com Holdings Inc</title>
        <cusip>090043100</cusip>
        <identifiers>
          <isin value="US0900431000"/>
          <ticker value="BILL"/>
          <other otherDesc="SEDOL" value="BKDS4H5"/>
        </identifiers>
        <balance>30734.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>7311003.9200000000</valUSD>
        <pctVal>4.4358661200</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>Westinghouse Air Brake Technologies Corp</name>
        <lei>06BTX5UWZD0GQ5N5Y745</lei>
        <title>Westinghouse Air Brake Technologies Corp</title>
        <cusip>929740108</cusip>
        <identifiers>
          <isin value="US9297401088"/>
          <ticker value="WAB"/>
          <other otherDesc="SEDOL" value="2955733"/>
        </identifiers>
        <balance>62515.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5802642.3000000000</valUSD>
        <pctVal>3.5206853486</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>Blueprint Medicines Corp</name>
        <lei>N/A</lei>
        <title>Blueprint Medicines Corp</title>
        <cusip>09627Y109</cusip>
        <identifiers>
          <isin value="US09627Y1091"/>
          <ticker value="BPMC"/>
          <other otherDesc="SEDOL" value="BWY52P3"/>
        </identifiers>
        <balance>23394.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1416506.7000000000</valUSD>
        <pctVal>0.8594488730</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>Boston Beer Co Inc/The</name>
        <lei>N/A</lei>
        <title>Boston Beer Co Inc/The</title>
        <cusip>100557107</cusip>
        <identifiers>
          <isin value="US1005571070"/>
          <ticker value="SAM"/>
          <other otherDesc="SEDOL" value="2113393"/>
        </identifiers>
        <balance>5758.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2207962.6800000000</valUSD>
        <pctVal>1.3396555321</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>Cactus Inc</name>
        <lei>549300J3T8C9F8QFKV08</lei>
        <title>Cactus Inc</title>
        <cusip>127203107</cusip>
        <identifiers>
          <isin value="US1272031071"/>
          <ticker value="WHD"/>
          <other otherDesc="SEDOL" value="BF1GM16"/>
        </identifiers>
        <balance>60719.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3076024.5400000000</valUSD>
        <pctVal>1.8663419129</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>Chegg Inc</name>
        <lei>549300AKX7O8JG0O3G77</lei>
        <title>Chegg Inc</title>
        <cusip>163092109</cusip>
        <identifiers>
          <isin value="US1630921096"/>
          <ticker value="CHGG"/>
          <other otherDesc="SEDOL" value="BG6N6K6"/>
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        <balance>28512.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>891570.2400000000</valUSD>
        <pctVal>0.5409498154</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>Chipotle Mexican Grill Inc</name>
        <lei>N/A</lei>
        <title>Chipotle Mexican Grill Inc</title>
        <cusip>169656105</cusip>
        <identifiers>
          <isin value="US1696561059"/>
          <ticker value="CMG"/>
          <other otherDesc="SEDOL" value="B0X7DZ3"/>
        </identifiers>
        <balance>1900.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2894365.0000000000</valUSD>
        <pctVal>1.7561221117</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>Cognex Corp</name>
        <lei>549300JQTYZCLC43S226</lei>
        <title>Cognex Corp</title>
        <cusip>192422103</cusip>
        <identifiers>
          <isin value="US1924221039"/>
          <ticker value="CGNX"/>
          <other otherDesc="SEDOL" value="2208288"/>
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        <balance>44830.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3028714.8000000000</valUSD>
        <pctVal>1.8376372815</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>Constellation Brands Inc</name>
        <lei>5493005GKEG8QCVY7037</lei>
        <title>Constellation Brands Inc</title>
        <cusip>21036P108</cusip>
        <identifiers>
          <isin value="US21036P1084"/>
          <ticker value="STZ"/>
          <other otherDesc="SEDOL" value="2170473"/>
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        <balance>34622.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>7465195.6400000000</valUSD>
        <pctVal>4.5294201427</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>DocuSign Inc</name>
        <lei>549300Q7PVDWRZ39JG09</lei>
        <title>DocuSign Inc</title>
        <cusip>256163106</cusip>
        <identifiers>
          <isin value="US2561631068"/>
          <ticker value="DOCU"/>
          <other otherDesc="SEDOL" value="BFYT7B7"/>
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        <balance>34949.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4139010.0700000000</valUSD>
        <pctVal>2.5112959507</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>Meta Platforms Inc</name>
        <lei>BQ4BKCS1HXDV9HN80Z93</lei>
        <title>Meta Platforms Inc</title>
        <cusip>30303M102</cusip>
        <identifiers>
          <isin value="US30303M1027"/>
          <ticker value="FB"/>
          <other otherDesc="SEDOL" value="B7TL820"/>
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        <balance>21560.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4549806.8000000000</valUSD>
        <pctVal>2.7605420620</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>Intercontinental Exchange Inc</name>
        <lei>5493000F4ZO33MV32P92</lei>
        <title>Intercontinental Exchange Inc</title>
        <cusip>45866F104</cusip>
        <identifiers>
          <isin value="US45866F1049"/>
          <ticker value="ICE"/>
          <other otherDesc="SEDOL" value="BFSSDS9"/>
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        <balance>26243.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3362253.1600000000</valUSD>
        <pctVal>2.0400077804</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>Intuitive Surgical Inc</name>
        <lei>54930052SRG011710797</lei>
        <title>Intuitive Surgical Inc</title>
        <cusip>46120E602</cusip>
        <identifiers>
          <isin value="US46120E6023"/>
          <ticker value="ISRG"/>
          <other otherDesc="SEDOL" value="2871301"/>
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        <balance>20509.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5954377.9700000000</valUSD>
        <pctVal>3.6127491917</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>Mastercard Inc</name>
        <lei>AR5L2ODV9HN37376R084</lei>
        <title>Mastercard Inc</title>
        <cusip>57636Q104</cusip>
        <identifiers>
          <isin value="US57636Q1040"/>
          <ticker value="MA"/>
          <other otherDesc="SEDOL" value="B121557"/>
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        <balance>17778.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6414657.9600000000</valUSD>
        <pctVal>3.8920186923</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>
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      </invstOrSec>
      <invstOrSec>
        <name>State Street Institutional US Government Money Market Fund</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional US Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
          <ticker value="GVMXX"/>
          <other otherDesc="SEDOL" value="B284MN4"/>
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        <balance>469756.5300000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>469756.5300000000</valUSD>
        <pctVal>0.2850192804</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Monolithic Power Systems Inc</name>
        <lei>N/A</lei>
        <title>Monolithic Power Systems Inc</title>
        <cusip>609839105</cusip>
        <identifiers>
          <isin value="US6098391054"/>
          <ticker value="MPWR"/>
          <other otherDesc="SEDOL" value="B01Z7J1"/>
        </identifiers>
        <balance>13716.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6291529.2000000000</valUSD>
        <pctVal>3.8173117572</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>
    <signature>
      <ncom:dateSigned>2022-04-25</ncom:dateSigned>
      <ncom:nameOfApplicant>American Century ETF Trust</ncom:nameOfApplicant>
      <ncom:signature>Amy R. Bitter</ncom:signature>
      <ncom:signerName>Amy R. Bitter</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
