March 31, 2021
March 31, 2021 William Blair Funds Portfolios of Investments Table of Contents Portfolio of Investments Growth Fund . 1 Large Cap Growth Fund . 3 Mid Cap Growth Fund . 5 Small-Mid Cap Core Fund . 7 Small-Mid Cap Growth Fund . 10 Small-Mid Cap Value Fund . 13 Small Cap Growth Fund . 16 Small Cap Value Fund . 19 Global Leaders Fund . 22 International Leaders Fund . 26 International Growth Fund . 30 Institutional International Growth Fund . 37 International Small Cap Growth Fund . 44 Emerging Markets Leaders Fund . 49 Emerging Markets Growth Fund . 53 Emerging Markets Small Cap Growth Fund . 58 Bond Fund . 63 Income Fund . 69 Low Duration Fund . 74 Macro Allocation Fund . 79 Notes to Portfolios of Investments . 86 Growth Fund Portfolio of Investments, March 31, 2021 (all dollar amounts in thousands) (unaudited) Issuer Shares Value Common Stocks Information Technology—38.1% * Adobe, Inc. 16,256 $ 7,728 * Advanced Micro Devices, Inc. 76,929 6,039 * Alarm.com Holdings, Inc. 14,360 1,240 Brooks Automation, Inc. 30,917 2,524 Fidelity National Information Services, Inc. 50,903 7,157 * GoDaddy, Inc. 50,958 3,955 * Grid Dynamics Holdings, Inc. 184,373 2,937 Mastercard, Inc. 37,958 13,515 Microsoft Corporation 120,443 28,397 * MongoDB, Inc. 7,635 2,042 National Instruments Corporation 99,314 4,289 * Nice, Ltd.—ADR 16,909 3,686 * PayPal Holdings, Inc. 46,880 11,384 * Pure Storage, Inc. 232,913 5,017 Texas Instruments, Inc. 40,066 7,572 * Verra Mobility Corporation 254,570 3,446 * Workday, Inc. 17,406 4,324 115,252 Consumer Discretionary—15.7% Advance Auto Parts, Inc.
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