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      <regStreet1>4500 Main St</regStreet1>
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      <seriesName>American Century Mid Cap Growth Impact ETF</seriesName>
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        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>SBA Communications Corp</name>
        <lei>N/A</lei>
        <title>SBA Communications Corp</title>
        <cusip>78410G104</cusip>
        <identifiers>
          <isin value="US78410G1040"/>
          <ticker value="SBAC"/>
          <other otherDesc="SEDOL" value="BZ6TS23"/>
        </identifiers>
        <balance>298.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>91208.8600000000</valUSD>
        <pctVal>1.4228078338</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>Splunk Inc</name>
        <lei>549300XGDSGBP6UEI867</lei>
        <title>Splunk Inc</title>
        <cusip>848637104</cusip>
        <identifiers>
          <isin value="US8486371045"/>
          <ticker value="SPLK"/>
          <other otherDesc="SEDOL" value="B424494"/>
        </identifiers>
        <balance>1413.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>309913.2900000000</valUSD>
        <pctVal>4.8344761333</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>Square Inc</name>
        <lei>549300OHIIUWSTIZME52</lei>
        <title>Square Inc</title>
        <cusip>852234103</cusip>
        <identifiers>
          <isin value="US8522341036"/>
          <ticker value="SQ"/>
          <other otherDesc="SEDOL" value="BYNZGK1"/>
        </identifiers>
        <balance>2240.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>357414.4000000000</valUSD>
        <pctVal>5.5754672105</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>Teladoc Health Inc</name>
        <lei>549300I2PVFBC9MFAC61</lei>
        <title>Teladoc Health Inc</title>
        <cusip>87918A105</cusip>
        <identifiers>
          <isin value="US87918A1051"/>
          <ticker value="TDOC"/>
          <other otherDesc="SEDOL" value="BYQRFY1"/>
        </identifiers>
        <balance>662.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>142786.7800000000</valUSD>
        <pctVal>2.2273948951</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>Twilio Inc</name>
        <lei>5493004W8TRGD63APX93</lei>
        <title>Twilio Inc</title>
        <cusip>90138F102</cusip>
        <identifiers>
          <isin value="US90138F1021"/>
          <ticker value="TWLO"/>
          <other otherDesc="SEDOL" value="BD6P5Q0"/>
        </identifiers>
        <balance>1093.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>294847.6800000000</valUSD>
        <pctVal>4.5994609392</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>Veeva Systems Inc</name>
        <lei>549300YZEXPDB92M2F02</lei>
        <title>Veeva Systems Inc</title>
        <cusip>922475108</cusip>
        <identifiers>
          <isin value="US9224751084"/>
          <ticker value="VEEV"/>
          <other otherDesc="SEDOL" value="BFH3N85"/>
        </identifiers>
        <balance>960.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>270979.2000000000</valUSD>
        <pctVal>4.2271258358</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>Horizon Therapeutics Plc</name>
        <lei>N/A</lei>
        <title>Horizon Therapeutics Plc</title>
        <cusip>G46188101</cusip>
        <identifiers>
          <isin value="IE00BQPVQZ61"/>
          <ticker value="HZNP"/>
          <other otherDesc="SEDOL" value="BQPVQZ6"/>
        </identifiers>
        <balance>3708.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>278544.9600000000</valUSD>
        <pctVal>4.3451475126</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>Marvell Technology Group Ltd</name>
        <lei>8DF36O58U3QIHUCGZB18</lei>
        <title>Marvell Technology Group Ltd</title>
        <cusip>G5876H105</cusip>
        <identifiers>
          <isin value="BMG5876H1051"/>
          <ticker value="MRVL"/>
          <other otherDesc="SEDOL" value="2594653"/>
        </identifiers>
        <balance>5640.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>218719.2000000000</valUSD>
        <pctVal>3.4118987033</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>Aptiv PLC</name>
        <lei>N/A</lei>
        <title>Aptiv PLC</title>
        <cusip>G6095L109</cusip>
        <identifiers>
          <isin value="JE00B783TY65"/>
          <ticker value="APTV"/>
          <other otherDesc="SEDOL" value="B783TY6"/>
        </identifiers>
        <balance>2499.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>215213.8800000000</valUSD>
        <pctVal>3.3572176476</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>Sensata Technologies Holding PLC</name>
        <lei>N/A</lei>
        <title>Sensata Technologies Holding PLC</title>
        <cusip>G8060N102</cusip>
        <identifiers>
          <isin value="GB00BFMBMT84"/>
          <ticker value="ST"/>
          <other otherDesc="SEDOL" value="BFMBMT8"/>
        </identifiers>
        <balance>3697.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>153943.0800000000</valUSD>
        <pctVal>2.4014270125</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>1799.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>212983.6100000000</valUSD>
        <pctVal>3.3224266675</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>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2020-10-23</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>
