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| | <submissionType> 13F-HR </submissionType> |
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| | | <periodOfReport> 06-30-2020 </periodOfReport> |
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| | | <reportCalendarOrQuarter> 06-30-2020 </reportCalendarOrQuarter> |
| | | <filingManager> |
| <name> AMERICAN CENTURY COMPANIES INC </name> |
| <address> |
| <ns1:street1> 4500 MAIN STREET </ns1:street1> |
| <ns1:city> KANSAS CITY </ns1:city> |
| <ns1:stateOrCountry> MO </ns1:stateOrCountry> |
| <ns1:zipCode> 64111 </ns1:zipCode> |
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| | | <reportType> 13F HOLDINGS REPORT </reportType> |
| | | <form13FFileNumber> 028-11918 </form13FFileNumber> |
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| <cik> 0001483859 </cik> |
| <form13FFileNumber> 028-13791 </form13FFileNumber> |
| <name> Arrowmark Colorado Holdings LLC </name> |
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| <cik> 0001279913 </cik> |
| <form13FFileNumber> 028-10682 </form13FFileNumber> |
| <name> Marathon Asset Management LP </name> |
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| <cik> 0001163653 </cik> |
| <form13FFileNumber> 028-10594 </form13FFileNumber> |
| <name> NOMURA HOLDINGS INC </name> |
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| | <signatureBlock> |
| | | <name> Otis H. Cowan </name> |
| | | <title> Secretary </title> |
| | | <phone> 816 340-5575 </phone> |
| | | <signature> /s/Otis H. Cowan </signature> |
| | | <city> Kansas City </city> |
| | | <stateOrCountry> MO </stateOrCountry> |
| | | <signatureDate> 08-13-2020 </signatureDate> |
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| | | <tableEntryTotal> 1714 </tableEntryTotal> |
| | | <tableValueTotal> 105475543 </tableValueTotal> |
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| <name> AMERICAN CENTURY INVESTMENT MANAGEMENT INC </name> |
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