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      <regStreet1>4500 Main St</regStreet1>
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      <regZipOrPostalCode>64111</regZipOrPostalCode>
      <regPhone>816-531-5575</regPhone>
      <seriesName>American Century Mid Cap Growth Impact ETF</seriesName>
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      <totLiabs>2557.430000000000</totLiabs>
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        <name>Ball Corp</name>
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        <name>State Street Institutional US Government Money Market Fund</name>
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        </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>1824.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>384791.0400000000</valUSD>
        <pctVal>5.3149233362</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>868.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>172532.3600000000</valUSD>
        <pctVal>2.3831019205</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>Turning Point Therapeutics Inc</name>
        <lei>N/A</lei>
        <title>Turning Point Therapeutics Inc</title>
        <cusip>90041T108</cusip>
        <identifiers>
          <isin value="US90041T1088"/>
          <ticker value="TPTX"/>
          <other otherDesc="SEDOL" value="BJXBP30"/>
        </identifiers>
        <balance>1034.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>110121.0000000000</valUSD>
        <pctVal>1.5210454815</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>349858.3700000000</valUSD>
        <pctVal>4.8324160954</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>265795.2000000000</valUSD>
        <pctVal>3.6712941942</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>1902.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>139416.6000000000</valUSD>
        <pctVal>1.9256907354</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>529900P0GSQ79OOZEV53</lei>
        <title>Horizon Therapeutics Plc</title>
        <cusip>G46188101</cusip>
        <identifiers>
          <isin value="IE00BQPVQZ61"/>
          <ticker value="HZNP"/>
          <other otherDesc="SEDOL" value="BQPVQZ6"/>
        </identifiers>
        <balance>2162.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>152269.6600000000</valUSD>
        <pctVal>2.1032235297</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>Jazz Pharmaceuticals PLC</name>
        <lei>N/A</lei>
        <title>Jazz Pharmaceuticals PLC</title>
        <cusip>G50871105</cusip>
        <identifiers>
          <isin value="IE00B4Q5ZN47"/>
          <ticker value="JAZZ"/>
          <other otherDesc="SEDOL" value="B4Q5ZN4"/>
        </identifiers>
        <balance>1395.0000000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>196290.4500000000</valUSD>
        <pctVal>2.7112603593</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>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>261075.6000000000</valUSD>
        <pctVal>3.6061047548</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>296631.3000000000</valUSD>
        <pctVal>4.0972175927</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>180524.5100000000</valUSD>
        <pctVal>2.4934934321</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>263085.7600000000</valUSD>
        <pctVal>3.6338700746</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>2021-01-25</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>
  <documents>XXXX</documents>
</edgarSubmission>
