William Blair Investment Management LLC

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William Blair Investment Management LLC ✚
CRD #	173961
SEC #	801-80640
CIK #	0001644956, 0000012518
AUM	65.60 B (2026-04-09)
Employees	388 (37% Investors, 31% Brokers)
Phone	312-236-1600
Address	150 North Riverside Plaza Chicago, IL 60606-1598
Source	[IAPD] [EDGAR] [Website] [Twitter] [LinkedIn] [Facebook]

Total AUM ($B) Copy

In the News
Wed, 22 Jul 2026	William Blair Investment Management Launches Global Leaders Select Strategy, Appoints Chandan Khanna as Co-Portfolio Manager — Business Wire
Wed, 08 Jul 2026	William Blair Investment Management Appoints Olga Bitel As Chief Investment Strategist — Pulse 2.0
Tue, 07 Jul 2026	William Blair Investment Management Appoints Olga Bitel as Chief Investment Strategist — Yahoo Finance

Sector	Form 13F Holdings	Value ($B)
	Taiwan Semiconductor Manufacturing Co Ltd	1.9
	Nvidia Corp	1.6
	Apple Inc	1.2
	Microsoft Corp	1.1
	Alphabet Inc	0.7
	Broadcom Inc	0.7
	Amazon Com Inc	0.7
	Facebook Inc	0.6
	Mastercard Inc	0.5
	Astrazeneca PLC	0.4
View All

Holdings by Sector ($B)

Type	Form D Funds	Date	Sold	AUM
Other	William Blair New Energy Opportunities Fund LLC	[2023-03-29]	4.8 M
	Offered $8,710,212 · Filed 2022-04-26 (D) · Exemption 506(b) · Remaining $3,905,034 · Duration One year or less · Revenue Decline to Disclose
Other	William Blair Large Cap Core Fund LLC	[2021-03-30]	8.6 M
	Offered $500,000,000 · Filed 2025-02-12 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining $491,450,000 · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair Global Leaders Equity Fund LLC	[2020-03-25]	5.0 M	3.1 M
	Offered $100,000,000 · Filed 2026-02-03 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining $94,975,000 · Duration More than one year · Net Assets Decline to Disclose
HF	William Blair Absolute Return Currency Fund LLC	[2019-03-26]	110.1 M
	Filed 2021-06-30 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair Emerging Markets Growth Fund LLC	[2019-03-26]	855.1 M	385.7 M
	Filed 2026-02-03 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair Emerging Markets Leaders Fund LLC	[2019-03-26]	319.2 M
	Filed 2025-02-12 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair International Leaders Concentrated Fund LLC	[2019-03-26]	26.7 M
	Filed 2025-06-27 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair China A-Shares Growth Fund LP	[2018-03-27]	138.1 M	4.2 M
	Filed 2026-02-03 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair Emerging Markets Leaders Concentrated Fund LLC	[2018-03-27]	7.3 M
	Offered $100,000,000 · Filed 2025-02-12 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $1,000,000 · Remaining $92,718,000 · Duration More than one year · Net Assets Decline to Disclose
Other	William Blair International Leaders Fund LLC	[2017-03-29]	472.1 M	71.4 M
	Filed 2026-02-03 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $5,000,000 · Remaining Indefinite · Duration More than one year · Net Assets Decline to Disclose
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AUM Breakdown	Accounts	AUM ($B)
By Client Type
(a) Individuals (other than high net worth individuals)	0	0.0
(b) Individuals (high net worth individuals)	2	0.0
(c) Banking or thrift institutions	0	0.0
(d) Investment companies	29	15.8
(e) Business development companies	0	0.0
(f) Pooled investment vehicles	51	22.1
(g) Pension and profit sharing plans	73	11.9
(h) Charitable organizations	68	2.3
(i) State or municipal government entities	54	11.9
(j) Other investment advisers	1	0.3
(k) Insurance companies	4	0.0
(l) Sovereign wealth funds and foreign official institutions	4	0.7
(m) Corporations or other businesses not listed above	10	0.2
(n) Other	386	0.2
Total	682	65.6
By Discretionary
Discretionary	682	65.6
Non-Discretionary	0	0.0
Total	682	65.6
By Non-United States Persons
Non-United States Persons		7.6
United States Persons		58.0
Total	682	65.6

Limited Partners	2011 - 2026
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	Role	# Filings	# Firms
John Moore	Executive Officer	61	4
Richard Kiphart	Executive Officer	15	4
Howard Smith	Director	42	3
Advanced Strategies LLC William Blair	Executive Officer, Promoter	25	3
Richard Smirl	Director, Executive Officer	25	3
Michelle Seitz	Director, Executive Officer	24	3
Robert Newman	Executive Officer	15	3
Arthur Simon	Director, Executive Officer	15	3
Edgar Jannotta	Executive Officer	5	3
Matthew Calhoun	Director	3	3
View All

EDGAR Form	CIK	2011 - 2026
13F-HR	[0001644956]
SC 13G	[0001644956]

Form 13D/13G Filer	Form 13D/13G Subject	Filed
William Blair Investment Management LLC	National Bank Holdings Corp	[2026-05-08]
William Blair Investment Management LLC	I3 Verticals Inc	[2026-05-07]
William Blair Investment Management LLC	Diebold Nixdorf Inc	[2026-02-09]
William Blair Investment Management LLC	Revolve Group Inc	[2026-02-09]
William Blair Investment Management LLC	Amicus Therapeutics Inc	[2025-11-12]
William Blair Investment Management LLC	National Vision Holdings Inc	[2025-11-12]
William Blair Investment Management LLC	Treace Medical Concepts Inc	[2025-11-12]
William Blair Investment Management LLC	Perella Weinberg Partners	[2025-11-12]
William Blair Investment Management LLC	Genedx Holdings Corp	[2025-07-30]
William Blair Investment Management LLC	Twist Bioscience Corp	[2025-05-09]
View All

Firm Profile (Form ADV)
Clients	18 (5 non-US)
Serves	Institutional, Retail
Fund Types	Hedge Fund
LEI	549300VQX7UKO60A7X27

Related Firms	State	AUM
William Blair Investment Management LLC ✚	IL	65.60 B
William Blair & Company LLC ✚	IL	64.28 B

Comparable Firms	State	AUM
Connor Clark & Lunn Investment Management Ltd ✚		85.59 B
Pzena Investment Management LLC ✚	NY	81.44 B
RBC Rochdale LLC ✚	NY	72.96 B
Brookfield Public Securities Group LLC ✚	NY	66.46 B
Brandywine Global Investment Management LLC ✚	PA	65.44 B
Quantinno Capital Management LP ✚	NY	60.91 B
Eagle Asset Management Inc ✚	FL	60.65 B
GW&K Investment Management LLC ✚	MA	52.78 B
Calamos Advisors LLC ✚	IL	43.89 B
Aristotle Capital Management LLC ✚	CA	43.54 B

William Blair Investment Management LLC

Assets, Funds, Holdings