TWUIX
Ultra Fund
American Century Mutual Funds, Inc.

Portfolio concentration

As of January 31, 2026 · N-PORT
Holdings
66
Top-10 weight
64.12%
Effective holdings ?
18
Crowding ?
2019.2

Holdings

As of January 31, 2026 · N-PORT
#SecurityTickerSharesValue% of fund
1 NVIDIA CORP 21,097,000 $4.03B 15.32%
2 APPLE INC 8,430,950 $2.19B 8.31%
3 AMAZON.COM INC 8,534,000 $2.04B 7.76%
4 MICROSOFT CORP 3,909,000 $1.68B 6.39%
5 ALPHABET INC CL A 4,613,455 $1.56B 5.93%
6 ALPHABET INC CL C 4,009,000 $1.36B 5.16%
7 TESLA INC 2,792,000 $1.20B 4.57%
8 MASTERCARD INC CL A 1,782,786 $960.55M 3.65%
9 META PLATFORMS INC CL A 1,308,000 $937.18M 3.56%
10 BROADCOM INC 2,784,000 $922.34M 3.51%
11 NETFLIX INC 7,010,000 $585.26M 2.22%
12 COSTCO WHOLESALE CORP 608,000 $571.67M 2.17%
13 APPLIED MATERIALS INC 1,384,000 $446.09M 1.70%
14 INTUITIVE SURGICAL INC 873,981 $440.68M 1.67%
15 LILLY ELI and CO 374,000 $387.89M 1.47%
16 ASML Holding NV 263,000 $377.12M 1.43%
17 ORACLE CORP 1,988,000 $327.19M 1.24%
18 ANALOG DEVICES INC 1,020,000 $317.10M 1.21%
19 AMPHENOL CORPORATION CL A 2,154,000 $310.35M 1.18%
20 INTERACTIVE BROKERS GROUP INC 3,740,000 $280.05M 1.06%
21 FAIR ISAAC CORP 186,000 $272.15M 1.03%
22 VERTIV HOLDINGS CO 1,362,000 $253.58M 0.96%
23 ALNYLAM PHARMACEUTICALS INC 747,000 $252.53M 0.96%
24 ZSCALER INC 1,220,000 $244.01M 0.93%
25 ECOLAB INC 811,000 $228.69M 0.87%
26 CLOUDFLARE INC-A 1,247,000 $221.16M 0.84%
27 SNOWFLAKE INC CL A 1,072,000 $206.57M 0.79%
28 SYNOPSYS INC 428,000 $199.07M 0.76%
29 DATADOG INC CL A 1,506,000 $194.76M 0.74%
30 HOWMET AEROSPACE INC 928,000 $193.10M 0.73%
31 PALANTIR TECHNOLOGIES INC 1,301,000 $190.71M 0.72%
32 INSULET CORP 710,000 $181.63M 0.69%
33 IDEXX LABS INC 257,000 $172.31M 0.65%
34 REGENERON PHARMACEUTICALS INC 225,000 $166.83M 0.63%
35 WESTINGHOUSE AIR BRAKE TECH CORP 705,000 $162.25M 0.62%
36 ACUITY INC 492,000 $152.15M 0.58%
37 Ascendis Pharma A/S 664,000 $150.13M 0.57%
38 ADVANCED DRAINAGE SYSTEMS INC 901,000 $136.99M 0.52%
39 VERTEX PHARMACEUTICALS INC 275,000 $129.22M 0.49%
40 WINGSTOP INC 446,000 $118.38M 0.45%
41 JOHNSON CONTROLS 940,000 $112.10M 0.43%
42 MSCI INC 184,000 $112.10M 0.43%
43 CHIPOTLE MEXICAN GRILL INC 2,761,000 $107.32M 0.41%
44 OKTA INC CL A 1,183,000 $99.94M 0.38%
45 THE BOOKING HOLDINGS INC 19,000 $95.03M 0.36%
46 DONALDSON CO INC 889,000 $90.62M 0.34%
47 Viking Holdings Ltd 1,130,000 $81.53M 0.31%
48 TRADEWEB MARKETS INC A 767,000 $79.05M 0.30%
49 HEICO CORP 209,000 $69.16M 0.26%
50 EOG RESOURCES INC 599,000 $67.17M 0.26%
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