William Blair Investment Management LLC

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William Blair Investment Management LLC
CRD #173961
SEC #801-80640
CIK #0001644956, 0000012518
AUM $71.6 B (2025-07-16)
Employees 378 (40% Investors, 34% Brokers)
Phone312-236-1600
Address150 North Riverside Plaza
Chicago, IL 60606-1598
Source [IAPD] [EDGAR] [Website] [Twitter] [LinkedIn] [Instagram]
Total AUM ($B)
806448321602011201620212026
Sector Form 13F Holdings Value ($B)
Microsoft Corp 2.0
Nvidia Corp 1.9
Taiwan Semiconductor Manufacturing Co Ltd 1.5
Amazon Com Inc 1.2
Apple Inc 1.1
Facebook Inc 1.1
Broadcom Inc 0.8
Mastercard Inc 0.7
MercadoLibre Inc 0.6
Sea Ltd 0.6
View All
Holdings by Sector ($B)
504030201002013201720212026
Type Form D Funds Date Sold ($M) AUM ($M)
Other William Blair New Energy Opportunities Fund LLC [2023-03-29] 4.8 0.0
Other William Blair Large Cap Core Fund LLC [2021-03-30] 8.6 3.0
Other William Blair Global Leaders Concentrated Fund LLC [2020-03-25] 5.0 6.4
HF William Blair Absolute Return Currency Fund LLC [2019-03-26] 110.1 0.0
Other William Blair Emerging Markets Growth Fund LLC [2019-03-26] 850.1 447.0
Other William Blair Emerging Markets Leaders Fund LLC [2019-03-26] 319.2 302.0
Other William Blair International Leaders Concentrated Fund LLC [2019-03-26] 26.7 1.1
Other William Blair China A-Shares Growth Fund LP [2018-03-27] 138.1 7.0
Other William Blair Emerging Markets Leaders Concentrated Fund LLC [2018-03-27] 7.3 0.9
Other William Blair International Leaders Fund LLC [2017-03-29] 472.1 299.7
View All
AUM Breakdown Accounts AUM ($B)
By Client Type
(a) Individuals (other than high net worth individuals) 0 0.0
(b) Individuals (high net worth individuals) 4 0.0
(c) Banking or thrift institutions 0 0.0
(d) Investment companies 30 17.9
(e) Business development companies 0 0.0
(f) Pooled investment vehicles 64 23.3
(g) Pension and profit sharing plans 86 12.0
(h) Charitable organizations 70 2.6
(i) State or municipal government entities 56 12.7
(j) Other investment advisers 3 0.6
(k) Insurance companies 4 0.0
(l) Sovereign wealth funds and foreign official institutions 5 1.7
(m) Corporations or other businesses not listed above 11 0.4
(n) Other 714 0.4
Total 1,047 71.6
By Discretionary
Discretionary 1,047 71.6
Non-Discretionary 0 0.0
Total 1,047 71.6
By Non-United States Persons
Non-United States Persons 8.2
United States Persons 63.4
Total 1,047 71.6
Limited Partners2011 - 2025
Baltimore County Fire and Police Employees' Retirement System
Fresno County Employee Retirement Association
Hawaii Employee Retirement System
Illinois Municipal Retirement Fund
Kansas Public Employees Retirement System
Massachusetts Pension Reserves Investment Management
Minnesota State Board of Investment
New York City Board of Education Retirement System
New York City Employees' Retirement System
New York State and Local Retirement System
Orange County Employee Retirement System
Oregon Public Employees Retirement Fund
State Board of Administration of Florida
Teachers' Retirement Security for Illinois Educators
Washington State Investment Board
Form D Directors # Filings # Firms 2011 - 2025
John Moore 60
Richard Kiphart 15
Howard Smith 40
Richard Smirl 25
Advanced Strategies LLC William Blair 25
Michelle Seitz 24
Robert Newman 15
Arthur Simon 15
Edgar Jannotta 4
Matthew Calhoun 3
View All
EDGAR Form CIK 2011 - 2025
13F-HR [0001644956]
SC 13G [0001644956]
Form 13D/13G Filer Form 13D/13G Subject Filed
William Blair Investment Management LLC Genedx Holdings Corp [2025-07-30]
William Blair Investment Management LLC Twist Bioscience Corp [2025-05-09]
William Blair Investment Management LLC Montrose Environmental Group Inc [2025-05-09]
William Blair Investment Management LLC Stride Inc [2025-02-12]
William Blair Investment Management LLC Baldwin Insurance Group Inc [2025-02-12]
William Blair Investment Management LLC El Pollo Loco Holdings Inc [2025-02-12]
William Blair Investment Management LLC ACV Auctions Inc [2024-11-14]
William Blair Investment Management LLC New Fortress Energy Inc [2024-11-14]
William Blair Investment Management LLC BBB Foods Inc [2024-11-14]
William Blair Investment Management LLC Amicus Therapeutics Inc [2024-11-14]
William Blair Investment Management LLC Orion Sa [2024-11-14]
William Blair Investment Management LLC Doximity Inc [2024-11-14]
William Blair Investment Management LLC Flywire Corp [2024-11-14]
William Blair Investment Management LLC Neogen Corp [2024-11-14]
William Blair Investment Management LLC Fox Factory Holding Corp [2024-11-14]
William Blair Investment Management LLC Golden Entertainment Inc [2024-11-14]
William Blair Investment Management LLC Ziprecruiter Inc [2024-11-14]
William Blair Investment Management LLC Adtran Holdings Inc [2024-02-12]
William Blair Investment Management LLC Twist Bioscience Corp [2024-02-12]
William Blair Investment Management LLC Vital Farms Inc [2024-02-12]
William Blair Investment Management LLC Clearwater Analytics Holdings Inc [2024-02-12]
William Blair Investment Management LLC Freshpet Inc [2024-02-12]
William Blair Investment Management LLC Lancaster Colony Corp [2024-02-12]
William Blair Investment Management LLC Encompass Health Corp [2024-02-12]
William Blair Investment Management LLC Alarmcom Holdings Inc [2024-02-12]
William Blair Investment Management LLC Casella Waste Systems Inc [2024-02-12]
William Blair Investment Management LLC Varonis Systems Inc [2023-02-09]
William Blair Investment Management LLC PagerDuty Inc [2023-02-09]
William Blair Investment Management LLC Audiocodes Ltd [2023-02-09]
William Blair Investment Management LLC Orion Engineered Carbons Sa [2022-02-10]
William Blair Investment Management LLC Overstockcom Inc [2022-02-10]
William Blair Investment Management LLC Denbury Inc [2022-02-10]
William Blair Investment Management LLC Leslie's Inc [2022-02-10]
William Blair Investment Management LLC National Vision Holdings Inc [2022-02-10]
William Blair Investment Management LLC Designer Brands Inc [2022-02-10]
William Blair Investment Management LLC Catchmark Timber Trust Inc [2022-02-10]
William Blair Investment Management LLC Universal Electronics Inc [2022-02-10]
William Blair Investment Management LLC Euronet Worldwide Inc [2022-02-10]
William Blair Investment Management LLC Standard Motor Products Inc [2022-02-10]
William Blair Investment Management LLC Myers Industries Inc [2022-02-10]
William Blair Investment Management LLC Virtu Financial Inc [2022-02-10]
William Blair Investment Management LLC Revolve Group Inc [2022-02-10]
William Blair Investment Management LLC Mercury Systems Inc [2021-02-11]
William Blair Investment Management LLC Grid Dynamics Holdings Inc [2021-02-11]
William Blair Investment Management LLC Alarmcom Holdings Inc [2021-02-11]
William Blair Investment Management LLC Brooks Automation Inc [2021-02-11]
William Blair Investment Management LLC FirstCash Inc [2021-02-11]
William Blair Investment Management LLC Merit Medical Systems Inc [2021-02-11]
William Blair Investment Management LLC Hanger Inc [2021-02-11]
William Blair Investment Management LLC Ducommun Inc /DE/ [2021-02-11]
William Blair Investment Management LLC Rush Street Interactive Inc [2021-02-11]
William Blair Investment Management LLC Star Peak Energy Transition Corp [2021-01-08]
William Blair Investment Management LLC Brinks Co [2020-12-08]
William Blair Investment Management LLC Portola Pharmaceuticals Inc [2020-02-10]
William Blair Investment Management LLC Virtu Financial Inc [2020-02-10]
William Blair Investment Management LLC Veracyte Inc [2020-02-10]
William Blair Investment Management LLC Encompass Health Corp [2020-02-10]
William Blair Investment Management LLC Willdan Group Inc [2020-02-10]
William Blair Investment Management LLC Pure Storage Inc [2020-02-10]
William Blair Investment Management LLC TREX Co Inc [2020-02-10]
William Blair Investment Management LLC Luxfer Holdings PLC [2020-02-10]
William Blair Investment Management LLC J2 Global Inc [2020-02-10]
William Blair Investment Management LLC BJ's Wholesale Club Holdings Inc [2020-02-10]
William Blair Investment Management LLC Grand Canyon Education Inc [2020-02-10]
William Blair Investment Management LLC Healthcare Services Group Inc [2019-02-13]
William Blair Investment Management LLC Aspen Group Inc [2019-02-13]
William Blair Investment Management LLC Rogers Corp [2018-02-13]
William Blair Investment Management LLC Maxlinear Inc [2018-02-13]
William Blair Investment Management LLC Adtalem Global Education Inc [2018-02-13]
William Blair Investment Management LLC BWX Technologies Inc [2018-02-13]
William Blair Investment Management LLC Horizon Pharma PLC [2018-02-13]
William Blair Investment Management LLC iShares Inc [2017-02-14]
William Blair Investment Management LLC 2U Inc [2017-02-14]
William Blair Investment Management LLC CSRA Inc [2017-02-14]
William Blair Investment Management LLC Glaukos Corp [2017-02-14]
William Blair Investment Management LLC iShares Inc [2017-02-14]
William Blair Investment Management LLC J2 Global Inc [2017-02-14]
William Blair Investment Management LLC Maximus Inc [2017-02-14]
William Blair Investment Management LLC Six Flags Entertainment Corp [2017-02-14]
William Blair Investment Management LLC Universal Electronics Inc [2017-02-14]
William Blair Investment Management LLC Ligand Pharmaceuticals Inc [2016-02-09]
William Blair Investment Management LLC Hudson Technologies Inc /NY [2016-02-09]
William Blair Investment Management LLC Global X Funds [2016-02-09]
William Blair Investment Management LLC US Auto Parts Network Inc [2016-02-09]
William Blair Investment Management LLC Firstservice Corp [2016-02-09]
William Blair Investment Management LLC Guidewire Software Inc [2016-02-09]
William Blair Investment Management LLC Northwest PIPE Co [2016-02-09]
William Blair Investment Management LLC Virtu Financial Inc [2016-02-09]
William Blair Investment Management LLC Old Dominion Freight Line Inc/VA [2016-02-09]
William Blair Investment Management LLC WD 40 Co [2016-02-09]
William Blair Investment Management LLC USA Technologies Inc [2016-02-09]
William Blair Investment Management LLC Exact Sciences Corp [2016-02-09]
William Blair Investment Management LLC First Cash Financial Services Inc [2016-02-09]
William Blair Investment Management LLC SPDR Index Shares Funds Formerly Streettracks Index Shares Funds [2016-02-09]
William Blair Investment Management LLC WisdomTree Trust [2016-02-09]
William Blair Investment Management LLC Align Technology Inc [2016-02-09]
William Blair Investment Management LLC Cambrex Corp [2016-02-09]
William Blair Investment Management LLC Square Inc [2016-02-09]
William Blair Investment Management LLC Encore Capital Group Inc [2015-10-09]
William Blair Investment Management LLC Neustar Inc [2015-10-09]
Related Firms State AUM ($B)
William Blair Investment Management LLC
IL 71.6
William Blair & Company LLC
IL 58.3
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Eagle Asset Management Inc
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GW&K Investment Management LLC
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