X0201 N-CEN LIVE 0000822632 XXXXXXXX 811-05344 false false false N-1A S000034349 C000105755 C000105754 C000105753 S000008601 C000023539 C000023538 S000027022 C000081289 C000081288 C000081290 S000008607 C000023549 S000019315 C000053608 C000053607 C000053609 S000017307 C000047896 C000047894 C000047895 S000035064 C000107902 C000107903 S000008596 C000023529 C000023530 C000023528 S000008606 C000023548 C000023547 S000037763 C000116468 C000116469 C000116470 S000008598 C000023533 C000023534 S000034624 C000106602 C000106600 C000106601 S000008603 C000023543 C000023542 S000008595 C000023527 C000023525 C000023526 S000008602 C000023540 C000023541 S000008597 C000023531 C000023532 S000008605 C000023546 S000008594 C000023523 C000023524 S000021052 C000059867 C000059868 C000088850 S000008604 C000023545 C000023544 S000010050 C000027837 C000027836 WILLIAM BLAIR FUNDS 811-05344 0000822632 SNQR0U5FDV8EZZX4W051 150 NORTH RIVERSIDE PLAZA CHICAGO 60606 US-IL US 312-364-8000 State Street Bank and Trust Company 1 Lincoln Street Boston 02111 617-786-3000 Custody and Accounting Records. N N N N-1A 21 N Kathleen T. Barr 001447347 N Stephanie G. Bramming 004852455 Y Steven R. Zenz 000000000 N Thomas J. Skelly 000000000 N Daniel N. Leib 000000000 N Arthur J. Simon 004169626 Y Donald J. Reaves 000000000 N Vann A. Avedisian 000000000 N Walter R. Randall, Jr. 002379435 150 North Riverside Plaza Chicago 60606 XXXXXX N N N N N William Blair & Company, L.L.C. 8-2698 000001252 549300J0P7XYE8BMZ775 Y N Ernst & Young LLP 42 00000000000000000000 N N N N N N N William Blair International Leaders Fund S000037763 KFD5PE0MGFTPJ8FU5L78 Y 3 0 0 N/A N N N N N/A N/A N/A Rule 32a-4 (17 CFR 270.32a-4) Y Y N N William Blair Investment Management, LLC 801-80640 000173961 549300VQX7UKO60A7X27 N DST Asset Manager Solutions, Inc. 84-00896 00000000000000000000 N N N ICE Data Services, Inc. 5493000NQ9LYLDBCTL34 N Bloomberg L.P. 549300B56MD0ZC402L06 N Thomson Reuters Corporation 549300561UZND4C7B569 CA N N Deutsche Bank Aktiengesellschaft (Madrid, Madrid, ES, Branch) 529900SICIK5OVMVY186 ES N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Nordea Bank AB (publ) (Stockholm, Stockholm, SE, Branch) 6SCPQ280AIY8EP3XFW53 SE N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank (Malaysia) Berhad 529900DLWFR8HK7DR278 MY N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) FirstRand Bank Limited ZAYQDKTCATIXF9OQY690 ZA N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) HSBC Bank Egypt S.A.E 2138001Q77JDLESS4Y50 EG N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Ngan Hang Trach Nhiem Huu Han Mot Thanh Vien HSBC (Viet Nam) 213800H95OG9OHRT4Y78 VN N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) BNP Paribas Securities Services (Athens, Attica, GR, Branch) 549300WCGB70D06XZS54 GR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Bank Handlowy w Warszawie Spolka Akcyjna XLEZHWWOI4HFQDGL4793 PL N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank Aktiengesellschaft (Makati City, Metro Manila, PH, Branch) 7LTWFZYICNSX8D621K86 PH N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank Aktiengesellschaft (Sisli, Istanbul, TR, Branch) 0000000000 TR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Bank Hapoalim B.M. 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LLC 8-15869 000008209 9R7GPTSO7KV3UQJZQ078 197227.07000000 Investment Technology Group, Inc. 8-44218 000029299 0000000000 110754.26000000 UBS AG N/A 000000000 BFM8T61CT2L1QCEMIK50 CH 272292.06000000 Citigroup Global Markets Inc. 8-8177 000007059 MBNUM2BPBDO7JBLYG310 158890.49000000 JPMorgan Chase & Co. 8-35008 000000079 8I5DZWZKVSZI1NUHU748 147244.41000000 Jefferies LLC 8-15074 000002347 58PU97L1C0WSRCWADL48 168416.31000000 Merrill Lynch, Pierce, Fenner & Smith Incorporated 8-7221 000007691 8NAV47T0Y26Q87Y0QP81 379824.22000000 Societe Generale N/A 000000000 O2RNE8IBXP4R0TD8PU41 FR 154504.35000000 Credit Suisse Securities (USA) LLC 8-422 000000816 1V8Y6QCX6YMJ2OELII46 360828.32000000 Goldman Sachs & Co. LLC 8-129 000000361 FOR8UP27PHTHYVLBNG30 157909.21000000 3240809.33000000 State Street Bank and Trust Company N/A 000000000 571474TGEMMWANRLN572 8717536903.50000000 8717536904.00000000 Y 2836537459.72250030 N N N N William Blair Macro Allocation Fund S000034624 UGF5VHIXVNRSS0FLDM98 Y 3 0 0 N/A N N N N N/A N/A N/A Rule 12d1-1 (17 CFR 270.12d1-1) Rule 32a-4 (17 CFR 270.32a-4) Y N N N William Blair Investment Management, LLC 801-80640 000173961 549300VQX7UKO60A7X27 N DST Asset Manager Solutions, Inc. 84-00896 00000000000000000000 N N N Thomson Reuters Corporation 549300561UZND4C7B569 CA N Bloomberg L.P. 549300B56MD0ZC402L06 N ICE Data Services, Inc. 5493000NQ9LYLDBCTL34 N IHS Markit Ltd. 549300HLPTRASHS0E726 GB N N HSBC Bank Egypt S.A.E 2138001Q77JDLESS4Y50 EG N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Standard Chartered Bank (Thai) Public Company Limited 549300O1LQYCQ7G1IM57 TH N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank Aktiengesellschaft (Sisli, Istanbul, TR, Branch) 0000000000 TR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) State Street Bank and Trust Company (London, GB, Branch) 0000000000 GB N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) State Street Bank and Trust Company 571474TGEMMWANRLN572 N N Bank - section 17(f)(1) (15 U.S.C. 80a-17(f)(1)) HSBC Bank Middle East Limited 549300F99IL9YJDWH369 AE N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Cititrust Colombia S A Sociedad Fiduciaria 549300242J3IJCOSGI49 CO N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) FirstRand Bank Limited ZAYQDKTCATIXF9OQY690 ZA N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank Societa per Azioni 529900SS7ZWCX82U3W60 IT N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Bank Hapoalim B.M. 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