New Opportunties - TF

Schedule of Investments as of 2017-09-30 (Unaudited)

Holding Shares/Principal Amount Market Value ($) Cotiviti Holdings Inc 82,434 2,965,975 LogMeIn Inc 26,688 2,937,014 CDW Corp/DE 44,273 2,922,018 Tivity Health Inc 65,176 2,659,181 XPO Logistics Inc 38,536 2,611,970 Burlington Stores Inc 26,646 2,543,627 Ball Corp 58,574 2,419,106 RingCentral Inc 57,626 2,405,886 Bright Horizons Family Solutions Inc 27,768 2,393,879 MSCI Inc 20,395 2,384,176 Catalent Inc 58,551 2,337,356 CyrusOne Inc 39,336 2,318,070 Dolby Laboratories Inc 38,884 2,236,608 Granite Construction Inc 38,149 2,210,735 SiteOne Landscape Supply Inc 37,779 2,194,960 CBOE Holdings Inc 20,195 2,173,588 2U Inc 38,578 2,161,911 LKQ Corp 59,115 2,127,549 Summit Materials Inc 66,267 2,122,532 AAR Corp 56,143 2,121,083 Planet Fitness Inc 78,462 2,116,905 Callidus Software Inc 83,778 2,065,128 Mercury Systems Inc 39,658 2,057,457 Pool Corp 18,587 2,010,556 Fortune Brands Home & Security Inc 29,197 1,962,914 Brunswick Corp/DE 34,991 1,958,446 Brink's Co/The 23,134 1,949,040 Cooper Cos Inc/The 8,214 1,947,622 Chegg Inc 131,125 1,945,895 Tyler Technologies Inc 11,070 1,929,722 KLX Inc 36,290 1,920,830 Paycom Software Inc 25,177 1,887,268 WABCO Holdings Inc 12,660 1,873,680 Advanced Disposal Services Inc 72,336 1,822,144 Essent Group Ltd 44,825 1,815,412 Installed Building Products Inc 28,011 1,815,113 John Bean Technologies Corp 17,938 1,813,532 Alarm.com Holdings Inc 39,789 1,797,667 ITT Inc 40,325 1,785,188 Acadia Healthcare Co Inc 37,106 1,772,183 Broadridge Financial Solutions Inc 21,766 1,759,128 Saia Inc 27,789 1,740,981 Teleflex Inc 7,194 1,740,732 Square Inc 60,334 1,738,223 Leidos Holdings Inc 28,152 1,667,161 Arthur J Gallagher & Co 27,036 1,664,066 Diamondback Energy Inc 16,854 1,651,018 Vail Resorts Inc 7,237 1,650,904 RealPage Inc 41,262 1,646,354 New Opportunties - TF

Holding Shares/Principal Amount Market Value ($) Cathay General Bancorp 40,374 1,623,035 PRA Health Sciences Inc 20,845 1,587,764 EnPro Industries Inc 19,596 1,578,066 CoStar Group Inc 5,838 1,566,044 Hilton Grand Vacations Inc 40,336 1,558,180 Sealed Air Corp 36,463 1,557,699 Kennametal Inc 38,563 1,555,631 Monolithic Power Systems Inc 14,519 1,546,999 Trupanion Inc 57,982 1,531,305 Ingevity Corp 24,347 1,520,957 Coherent Inc 6,431 1,512,378 Scotts Miracle-Gro Co/The 15,478 1,506,629 Ameris Bancorp 30,478 1,462,944 Varex Imaging Corp 42,942 1,453,157 MRC Global Inc 81,493 1,425,313 Green Dot Corp 28,372 1,406,684 LCI Industries 12,052 1,396,224 Cavium Inc 21,006 1,385,136 BMC Stock Holdings Inc 64,808 1,383,651 HealthEquity Inc 27,323 1,381,997 Five9 Inc 57,753 1,380,297 KapStone Paper and Packaging Corp 63,426 1,363,025 Sun Communities Inc 15,430 1,322,042 RE/MAX Holdings Inc 20,707 1,315,930 RSP Permian Inc 37,904 1,311,099 Merit Medical Systems Inc 30,232 1,280,325 Cedar Fair LP 19,865 1,273,744 Evolent Health Inc 70,592 1,256,538 FCB Financial Holdings Inc 25,964 1,254,061 At Home Group Inc 54,059 1,234,708 Shopify Inc 10,556 1,229,668 Callon Petroleum Co 108,993 1,225,081 Kadant Inc 12,344 1,216,501 Ollie's Bargain Outlet Holdings Inc 26,205 1,215,912 Q2 Holdings Inc 29,166 1,214,764 Lennox International Inc 6,763 1,210,374 Bio-Techne Corp 9,982 1,206,724 ON Semiconductor Corp 65,285 1,205,814 Churchill Downs Inc 5,838 1,203,796 Tenneco Inc 19,472 1,181,366 Microsemi Corp 22,889 1,178,326 Euronet Worldwide Inc 12,371 1,172,647 James River Group Holdings Ltd 28,095 1,165,381 Masimo Corp 13,225 1,144,756 TTM Technologies Inc 74,241 1,141,084 AMETEK Inc 17,066 1,127,039 Medifast Inc 18,822 1,117,462 FirstService Corp 16,938 1,113,001 Hostess Brands Inc 80,976 1,106,132 MGP Ingredients Inc 17,089 1,036,106 New Opportunties - TF

Holding Shares/Principal Amount Market Value ($) Steven Madden Ltd 23,592 1,021,534 MKS Instruments Inc 10,814 1,021,382 Amedisys Inc 17,782 995,081 MarketAxess Holdings Inc 5,344 986,021 FormFactor Inc 58,338 982,995 Neurocrine Biosciences Inc 16,024 981,951 Nevro Corp 10,800 981,504 Malibu Boats Inc 29,360 928,950 Multi-Color Corp 11,198 917,676 NuVasive Inc 15,614 865,952 American Eagle Outfitters Inc 59,255 847,346 Valvoline Inc 35,116 823,470 Quotient Technology Inc 51,592 807,415 TreeHouse Foods Inc 11,798 799,079 Kite Pharma Inc 4,401 791,344 ServiceNow Inc 6,602 775,933 TESARO Inc 5,826 752,137 Alnylam Pharmaceuticals Inc 6,217 730,435 LendingTree Inc 2,985 729,683 Exelixis Inc 29,838 722,975 Copart Inc 20,914 718,814 Puma Biotechnology Inc 5,810 695,748 Boingo Wireless Inc 32,054 684,994 ACADIA Pharmaceuticals Inc 17,950 676,176 Clovis Oncology Inc 8,053 663,567 Ionis Pharmaceuticals Inc 13,077 663,004 Guidewire Software Inc 8,495 661,421 Masonite International Corp 9,518 658,646 Flexion Therapeutics Inc 23,809 575,702 Hamilton Lane Inc 20,932 562,024 Spark Therapeutics Inc 6,273 559,301 Seattle Genetics Inc 9,816 534,089 Aimmune Therapeutics Inc 19,758 489,801 Emerald Expositions Events Inc 19,802 460,198 Sarepta Therapeutics Inc 9,702 440,083 CIRCOR International Inc 7,883 429,072 Portola Pharmaceuticals Inc 7,816 422,298 Supernus Pharmaceuticals Inc 10,384 415,360 Horizon Pharma Plc 30,653 388,680 Radius Health Inc 9,366 361,059 Pacira Pharmaceuticals Inc/DE 9,479 355,936 Medicines Co/The 9,415 348,732 Biohaven Pharmaceutical Holding Co Ltd 8,954 334,701 Alder Biopharmaceuticals Inc 22,647 277,426 Ultragenyx Pharmaceutical Inc 4,182 222,733 Avexis Inc 2,284 220,931 Amicus Therapeutics Inc 13,671 206,159 Jounce Therapeutics Inc 8,565 133,443 Theravance Biopharma Inc 3,681 126,037 New Opportunties - TF

This schedule of investments provides information about the fund's portfolio holdings as of the date on the schedule. It is unaudited, and American Century assumes no obligation to update or supplement the schedule to reflect subsequent changes. More information is available in the fund's most recent annual or semiannual shareholder report or Form N-Q.