NPORT-P false 0000100334 XXXXXXXX S000006195 C000017061 C000017063 C000189740 C000131598 C000017062 C000017064 C000214991 C000017060 C000189739 American Century Mutual Funds, Inc. 811-00816 0000100334 549300DMFK0SMVLOE939 4500 Main St Kansas City 64111 816-531-5575 Ultra Fund S000006195 F6OVJ18MFLNHYYI4ZV69 2020-10-31 2020-07-31 N 15851566422.240000000000 15487782.900000000000 15836078639.340000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 0.000000000000 N CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 N/A 1 NC USD -1879920.7500000000 -0.0118711254 N/A DFE CORP N/A N 2 CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 33197632.0000000000 EUR 37272807.3200000000 USD 2020-09-30 -1879920.7500000000 N N N BANK OF AMERICA, N.A. B4TYDEB6GKMZO031MB27 N/A 1 NC USD -281413.4000000000 -0.0017770397 N/A DFE CORP N/A N 2 BANK OF AMERICA, N.A. B4TYDEB6GKMZO031MB27 4582730250.0000000000 JPY 43041647.1000000000 USD 2020-09-30 -281413.4000000000 N N N CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 N/A 1 NC USD -70103.6200000000 -0.0004426829 N/A DFE CORP N/A N 2 CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 1504267.7000000000 EUR 1704004.3700000000 USD 2020-09-30 -70103.6200000000 N N N CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 N/A 1 NC USD -66415.6600000000 -0.0004193946 N/A DFE CORP N/A N 2 CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 1530203.3500000000 EUR 1738280.4000000000 USD 2020-09-30 -66415.6600000000 N N N CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 N/A 1 NC USD 2476.1500000000 0.0000156361 N/A DFE CORP N/A N 2 CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 1282222.7400000000 USD 1089297.3000000000 EUR 2020-09-30 2476.1500000000 N N N CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 N/A 1 NC USD -5010.5700000000 -0.0000316402 N/A DFE CORP N/A N 2 CREDIT SUISSE LONDON BRANCH (GFX) E58DKGMJYYYJLN8C3868 1167104.2500000000 EUR 1371452.5300000000 USD 2020-09-30 -5010.5700000000 N N N Walt Disney Co/The 7260JQNI6SCF9FIV2392 254687106 1035000.0000000000 NS USD 121032900.0000000000 0.7642857980 Long EC CORP US N 1 N N N DocuSign Inc 549300Q7PVDWRZ39JG09 256163106 1754000.0000000000 NS USD 380319820.0000000000 2.4016035072 Long EC CORP US N 1 N N N Donaldson Co Inc OZE6KXY9QQPR8EJ8WL20 257651109 704557.0000000000 NS USD 34058285.3800000000 0.2150676702 Long EC CORP US N 1 N N N EOG Resources Inc XWTZDRYZPBUHIQBKDB46 26875P101 847000.0000000000 NS USD 39681950.0000000000 0.2505793947 Long EC CORP US N 1 N N N ABIOMED Inc 5493001EZN4ZTB4Z5887 003654100 103743.0000000000 NS USD 31116675.4200000000 0.1964923017 Long EC CORP US N 1 N N N ACUITY BRANDS N/A 00508Y102 499000.0000000000 NS USD 49450900.0000000000 0.3122673304 Long EC CORP US N 1 N N N Ecolab Inc 82DYEISM090VG8LTLS26 278865100 570582.0000000000 NS USD 106744480.5600000000 0.6740587932 Long EC CORP US N 1 N N N Edwards Lifesciences Corp YA13X31F3V31L8TMPR58 28176E108 2238438.0000000000 NS USD 175515923.5800000000 1.1083294519 Long EC CORP US N 1 N N N Alphabet Inc 5493006MHB84DD0ZWV18 02079K107 351787.0000000000 NS USD 521686049.5200000000 3.2942880709 Long EC CORP US N 1 N N N Alphabet Inc 5493006MHB84DD0ZWV18 02079K305 288955.0000000000 NS USD 429950592.2500000000 2.7150066758 Long EC CORP US N 1 N N N Amazon.com Inc ZXTILKJKG63JELOEG630 023135106 436294.0000000000 NS USD 1380730895.9200000000 8.7188939091 Long EC CORP US N 1 N N N Analog Devices Inc GYVOE5EZ4GDAVTU4CQ61 032654105 1258000.0000000000 NS USD 144481300.0000000000 0.9123552825 Long EC CORP US N 1 N N N Facebook Inc BQ4BKCS1HXDV9HN80Z93 30303M102 2746176.0000000000 NS USD 696622465.9200000000 4.3989581119 Long EC CORP US N 1 N N N Fair Isaac Corp RI6HET5SJUEY30V1PS26 303250104 191000.0000000000 NS USD 83885290.0000000000 0.5297099864 Long EC CORP US N 1 N N N JB Hunt Transport Services Inc 549300XCD1MPI1C5GK90 445658107 1273835.0000000000 NS USD 164834249.0000000000 1.0408779393 Long EC CORP US N 1 N N N IDEXX Laboratories Inc OGMTXK0LUU1HKV2P0J84 45168D104 313000.0000000000 NS USD 124495750.0000000000 0.7861526381 Long EC CORP US N 1 N N N Apple Inc HWUPKR0MPOU8FGXBT394 037833100 4417123.0000000000 NS USD 1877453959.9200000000 11.8555483506 Long EC CORP US N 1 N N N Applied Materials Inc 41BNNE1AFPNAZELZ6K07 038222105 1566108.0000000000 NS USD 100747727.6400000000 0.6361911300 Long EC CORP US N 1 N N N Biogen Inc W8J5WZB5IY3K0NDQT671 09062X103 424944.0000000000 NS USD 116727867.3600000000 0.7371008317 Long EC CORP US N 1 N N N Chipotle Mexican Grill Inc N/A 169656105 242398.0000000000 NS USD 280008473.6800000000 1.7681679919 Long EC CORP US N 1 N N N Intuitive Surgical Inc 54930052SRG011710797 46120E602 608810.0000000000 NS USD 417302726.4000000000 2.6351392659 Long EC CORP US N 1 N N N Ionis Pharmaceuticals Inc 549300SI4ZGLG0BLUZ92 462222100 731088.0000000000 NS USD 42081425.2800000000 0.2657313483 Long EC CORP US N 1 N N N Cognex Corp 549300JQTYZCLC43S226 192422103 829938.0000000000 NS USD 55497954.0600000000 0.3504526299 Long EC CORP US N 1 N N N Colgate-Palmolive Co YMEGZFW4SBUSS5BQXF88 194162103 1677000.0000000000 NS USD 129464400.0000000000 0.8175281454 Long EC CORP US N 1 N N N Constellation Brands Inc 5493005GKEG8QCVY7037 21036P108 936673.0000000000 NS USD 166915128.6000000000 1.0540180584 Long EC CORP US N 1 N N N Copart Inc 549300KVYX3JWMYEHU61 217204106 508736.0000000000 NS USD 47439632.0000000000 0.2995667872 Long EC CORP US N 1 N N N JPMorgan Chase & Co 8I5DZWZKVSZI1NUHU748 46625H100 1032435.0000000000 NS USD 99774518.4000000000 0.6300456109 Long EC CORP US N 1 N N N Estee Lauder Cos Inc/The 549300VFZ8XJ9NUPU221 518439104 961000.0000000000 NS USD 189835940.0000000000 1.1987559820 Long EC CORP US N 1 N N N Costco Wholesale Corp 29DX7H14B9S6O3FD6V18 22160K105 802820.0000000000 NS USD 261341994.6000000000 1.6502948776 Long EC CORP US N 1 N N N DexCom Inc N/A 252131107 154616.0000000000 NS USD 67341452.6400000000 0.4252407062 Long EC CORP US N 1 N N N lululemon athletica Inc 549300D9GZ4BMLDW5T40 550021109 208482.0000000000 NS USD 67879654.3800000000 0.4286392858 Long EC CORP CA N 1 N N N MSCI Inc 549300HTIN2PD78UB763 55354G100 491778.0000000000 NS USD 184898692.4400000000 1.1675787716 Long EC CORP US N 1 N N N State Street Institutional US Government Money Market Fund 549300BZ5TGIFZUZDZ37 857492706 49487.4300000000 NS USD 49487.4300000000 0.0003124980 Long STIV RF US N 1 N N N State Street Bank & Trust Co 0.05 08/03/2020 571474TGEMMWANRLN572 RPED1FHZ4 35097000.0000000000 PA USD 35097000.0000000000 0.2216268358 Long RA CORP US N 2 2020-08-03 Fixed 0.05 N N N Repurchase N 0.05 2020-08-03 35762700 USD 35799034.9 USD UST N N N Bank of Montreal/Chicago IL 0.04 08/03/2020 NQQ6HPCNCCU6TUTQYE16 RPE41FLT3 21931603.4200000000 PA USD 21931603.4200000000 0.1384913773 Long RA CORP US N 2 2020-08-03 Fixed 0.04 N N N Repurchase N 0.04 2020-08-03 21430685.6 USD 22366206.82 USD UST N N N Mastercard Inc AR5L2ODV9HN37376R084 57636Q104 2392700.0000000000 NS USD 738219731.0000000000 4.6616321364 Long EC CORP US N 1 N N N Microsoft Corp INR2EJN1ERAN0W5ZP974 594918104 4520765.0000000000 NS USD 926802032.6500000000 5.8524717751 Long EC CORP US N 1 N N N Netflix Inc 549300Y7VHGU0I7CE873 64110L106 536667.0000000000 NS USD 262365762.9600000000 1.6567596621 Long EC CORP US N 1 N N N Keyence Corp N/A N/A 127900.0000000000 NS 53750588.7800000000 0.3394185518 Long EC CORP JP N 2 N N N NIKE Inc 787RXPR0UX0O0XUXPZ81 654106103 2302000.0000000000 NS USD 224698220.0000000000 1.4189006326 Long EC CORP US N 1 N N N Nordson Corp 14OS6Q5N55N95WM84M53 655663102 322200.0000000000 NS USD 62387586.0000000000 0.3939585514 Long EC CORP US N 1 N N N Yaskawa Electric Corp N/A N/A 1951800.0000000000 NS 65015143.7300000000 0.4105507759 Long EC CORP JP N 2 N N N Paycom Software Inc 254900LSB0HNJUDC6Q18 70432V102 312000.0000000000 NS USD 88723440.0000000000 0.5602614260 Long EC CORP US N 1 N N N PayPal Holdings Inc 5493005X2GO78EFZ3E94 70450Y103 2528716.0000000000 NS USD 495805346.1200000000 3.1308593334 Long EC CORP US N 1 N N N Regeneron Pharmaceuticals Inc 549300RCBFWIRX3HYQ56 75886F107 522701.0000000000 NS USD 330383621.0700000000 2.0862716623 Long EC CORP US N 1 N N N Rockwell Automation Inc VH3R4HHBHH12O0EXZJ88 773903109 275000.0000000000 NS USD 59988500.0000000000 0.3788090560 Long EC CORP US N 1 N N N Roku Inc 549300KR6ITU0YIR1T71 77543R102 284000.0000000000 NS USD 43988760.0000000000 0.2777755845 Long EC CORP US N 1 N N N Ross Stores Inc 549300ENZFLPGRDFZQ60 778296103 1430729.0000000000 NS USD 128293469.4300000000 0.8101340764 Long EC CORP US N 1 N N N salesforce.com Inc RCGZFPDMRW58VJ54VR07 79466L302 2508766.0000000000 NS USD 488833055.1000000000 3.0868314450 Long EC CORP US N 1 N N N Shopify Inc 549300HGQ43STJLLP808 82509L107 220453.0000000000 NS USD 225743872.0000000000 1.4255036057 Long EC CORP CA N 1 N N N Splunk Inc 549300XGDSGBP6UEI867 848637104 373000.0000000000 NS USD 78262860.0000000000 0.4942060581 Long EC CORP US N 1 N N N Square Inc 549300OHIIUWSTIZME52 852234103 1742670.0000000000 NS USD 226285699.5000000000 1.4289250808 Long EC CORP US N 1 N N N Starbucks Corp OQSJ1DU9TAOC51A47K68 855244109 2380085.0000000000 NS USD 182147905.0500000000 1.1502083893 Long EC CORP US N 1 N N N TJX Cos Inc/The V167QI9I69W364E2DY52 872540109 4939724.0000000000 NS USD 256816250.7600000000 1.6217161875 Long EC CORP US N 1 N N N Tandem Diabetes Care Inc 549300JEPFOD0K4D3I05 875372203 380056.0000000000 NS USD 39700649.7600000000 0.2506974780 Long EC CORP US N 1 N N N Tesla Inc 54930043XZGB27CTOV49 88160R101 298000.0000000000 NS USD 426366480.0000000000 2.6923741016 Long EC CORP US N 1 N N N US Bancorp N1GZ7BBF3NP8GI976H15 902973304 1116000.0000000000 NS USD 41113440.0000000000 0.2596188169 Long EC CORP US N 1 N N N UnitedHealth Group Inc 549300GHBMY8T5GXDE41 91324P102 1728000.0000000000 NS USD 523203840.0000000000 3.3038724543 Long EC CORP US N 1 N N N Visa Inc 549300JZ4OKEHW3DPJ59 92826C839 3592544.0000000000 NS USD 684020377.6000000000 4.3193797731 Long EC CORP US N 1 N N N Westinghouse Air Brake Technologies Corp 06BTX5UWZD0GQ5N5Y745 929740108 1365607.0000000000 NS USD 84927099.3300000000 0.5362886941 Long EC CORP US N 1 N N N Wingstop Inc 549300SSH3F8HPIM3Q47 974155103 516716.0000000000 NS USD 80736875.0000000000 0.5098287072 Long EC CORP US N 1 N N N Xilinx Inc 6EY4K7ZMF9UX1CU6KC79 983919101 1090291.0000000000 NS USD 117042738.8500000000 0.7390891490 Long EC CORP US N 1 N N N Zoom Video Communications Inc N/A 98980L101 284000.0000000000 NS USD 72110440.0000000000 0.4553554048 Long EC CORP US N 1 N N N Tencent Holdings Ltd 254900N4SLUMW4XUYY11 N/A 1877000.0000000000 NS 128489348.5300000000 0.8113709931 Long EC CORP CN N 2 N N N Adyen NV 724500973ODKK3IFQ447 N/A 39901.0000000000 NS 66614383.1100000000 0.4206494842 Long EC CORP NL N 2 N N N 2020-09-24 American Century Mutual Funds, Inc. Amy R. Bitter Amy R. Bitter Assistant Treasurer XXXX