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      <invstOrSec>
        <name>Bright Horizons Family Solutions Inc</name>
        <lei>N/A</lei>
        <title>Bright Horizons Family Solutions Inc</title>
        <cusip>109194100</cusip>
        <identifiers>
          <isin value="US1091941005"/>
          <ticker value="BFAM"/>
          <other otherDesc="SEDOL" value="B7MJWP2"/>
        </identifiers>
        <balance>20494.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2353940.8400000000</valUSD>
        <pctVal>3.5947764228</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>Shockwave Medical Inc</name>
        <lei>549300LDXO56IC5Y1538</lei>
        <title>Shockwave Medical Inc</title>
        <cusip>82489T104</cusip>
        <identifiers>
          <isin value="US82489T1043"/>
          <ticker value="SWAV"/>
          <other otherDesc="SEDOL" value="BHLNZ89"/>
        </identifiers>
        <balance>3420.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>892175.4000000000</valUSD>
        <pctVal>1.3624688601</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>Vertiv Holdings Co</name>
        <lei>549300KTTIRAOGXCRV69</lei>
        <title>Vertiv Holdings Co</title>
        <cusip>92537N108</cusip>
        <identifiers>
          <isin value="US92537N1081"/>
          <ticker value="VRT"/>
          <other otherDesc="SEDOL" value="BL3LWS8"/>
        </identifiers>
        <balance>49143.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3323049.6600000000</valUSD>
        <pctVal>5.0747327063</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>Viking Therapeutics Inc</name>
        <lei>N/A</lei>
        <title>Viking Therapeutics Inc</title>
        <cusip>92686J106</cusip>
        <identifiers>
          <isin value="US92686J1060"/>
          <ticker value="VKTX"/>
          <other otherDesc="SEDOL" value="BQQG1V1"/>
        </identifiers>
        <balance>10721.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>826053.0500000000</valUSD>
        <pctVal>1.2614913585</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>Xylem Inc/NY</name>
        <lei>549300DF5MV96DRYLQ48</lei>
        <title>Xylem Inc/NY</title>
        <cusip>98419M100</cusip>
        <identifiers>
          <isin value="US98419M1009"/>
          <ticker value="XYL"/>
          <other otherDesc="SEDOL" value="B3P2CN8"/>
        </identifiers>
        <balance>12800.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1626240.0000000000</valUSD>
        <pctVal>2.4834817895</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>Cadence Design Systems Inc</name>
        <lei>GCT7RXJOGLXPV0NXZY22</lei>
        <title>Cadence Design Systems Inc</title>
        <cusip>127387108</cusip>
        <identifiers>
          <isin value="US1273871087"/>
          <ticker value="CDNS"/>
          <other otherDesc="SEDOL" value="2302232"/>
        </identifiers>
        <balance>12363.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3763049.9400000000</valUSD>
        <pctVal>5.7466708476</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>835.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2245122.9500000000</valUSD>
        <pctVal>3.4285972314</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>Trane Technologies PLC</name>
        <lei>N/A</lei>
        <title>Trane Technologies PLC</title>
        <cusip>G8994E103</cusip>
        <identifiers>
          <isin value="IE00BK9ZQ967"/>
          <ticker value="TT"/>
          <other otherDesc="SEDOL" value="BK9ZQ96"/>
        </identifiers>
        <balance>9129.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2574104.1300000000</valUSD>
        <pctVal>3.9309946449</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>IE</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>On Holding AG</name>
        <lei>N/A</lei>
        <title>On Holding AG</title>
        <cusip>H5919C104</cusip>
        <identifiers>
          <isin value="CH1134540470"/>
          <ticker value="ONON"/>
          <other otherDesc="SEDOL" value="BPF0FP9"/>
        </identifiers>
        <balance>28186.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>987073.7200000000</valUSD>
        <pctVal>1.5073910423</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CH</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Church &amp; Dwight Co Inc</name>
        <lei>POOXSI30AWAQGYJZC921</lei>
        <title>Church &amp; Dwight Co Inc</title>
        <cusip>171340102</cusip>
        <identifiers>
          <isin value="US1713401024"/>
          <ticker value="CHD"/>
          <other otherDesc="SEDOL" value="2195841"/>
        </identifiers>
        <balance>18789.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1881154.6800000000</valUSD>
        <pctVal>2.8727699424</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>Dexcom Inc</name>
        <lei>N/A</lei>
        <title>Dexcom Inc</title>
        <cusip>252131107</cusip>
        <identifiers>
          <isin value="US2521311074"/>
          <ticker value="DXCM"/>
          <other otherDesc="SEDOL" value="B0796X4"/>
        </identifiers>
        <balance>19473.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2240758.1100000000</valUSD>
        <pctVal>3.4219315482</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>Duolingo Inc</name>
        <lei>N/A</lei>
        <title>Duolingo Inc</title>
        <cusip>26603R106</cusip>
        <identifiers>
          <isin value="US26603R1068"/>
          <ticker value="DUOL"/>
          <other otherDesc="SEDOL" value="BMCM6P4"/>
        </identifiers>
        <balance>9034.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2159126.0000000000</valUSD>
        <pctVal>3.2972686088</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>Element Solutions Inc</name>
        <lei>549300FLGN6P5CU20J91</lei>
        <title>Element Solutions Inc</title>
        <cusip>28618M106</cusip>
        <identifiers>
          <isin value="US28618M1062"/>
          <ticker value="ESI"/>
          <other otherDesc="SEDOL" value="BJ1C2K1"/>
        </identifiers>
        <balance>108814.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2557129.0000000000</valUSD>
        <pctVal>3.9050713948</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>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"/>
        </identifiers>
        <balance>739435.6500000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>739435.6500000000</valUSD>
        <pctVal>1.1292152273</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>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2024-04-19</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>
