William Blair & Company LLC

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William Blair & Company LLC ✚
CRD #	1252
SEC #	801-688
CIK #	0001644956, 0000012518
AUM	64.28 B (2026-03-31)
Employees	492 (47% Investors, 83% Brokers)
Phone	312-236-1600
Address	150 North Riverside Plaza Chicago, IL 60606
Source	[IAPD] [EDGAR] [Website] [Twitter] [LinkedIn] [Facebook]

Total AUM ($B) Copy

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
PE	William Blair MB Investments LP - OC 2025 Series	[2026-03-31]		2.5 M
	Filed 2025-12-16 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - WD Series	[2025-03-31]		1.0 M
	Filed 2021-02-03 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - CXT 2022 Series	[2023-01-11]		4.8 M
	Filed 2022-10-28 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - BRPE FIII 2022 Series	[2022-09-26]		0.1 M
	Filed 2022-06-15 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - HC FII 2021 Series	[2022-06-14]		7.5 M
	Filed 2021-12-07 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - HII 2022 Eries	[2022-06-14]		6.3 M
	Filed 2022-03-17 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - ITYC 2022 Series	[2022-04-11]		2.5 M
	Filed 2022-03-24 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - PCTI 2022 Series	[2022-04-11]		6.8 M
	Filed 2022-02-24 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - TCP FIII 2022 Series	[2022-04-11]		4.5 M
	Filed 2022-03-18 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - FICI 2022 Series	[2022-03-07]		9.7 M
	Filed 2022-02-22 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - HV FIII 2021 Series	[2022-02-09]		1.5 M
	Filed 2021-04-30 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - M13V FIII 2021 Series	[2022-02-09]		6.1 M
	Filed 2021-11-30 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - MOG FIII 2021 Series	[2022-02-09]		6.4 M
	Filed 2021-10-06 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - UGSI 2021 Series	[2022-02-09]		14.2 M
	Filed 2021-08-31 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investmetns LP - FVC FII 2021 Series	[2022-02-09]		1.0 M
	Filed 2021-02-03 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - VMI 2021 Series	[2021-09-15]		20.7 M
	Filed 2021-08-20 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - EV FII 2021 Series	[2021-07-20]		1.5 M
	Filed 2021-06-01 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - HII 2021 Series	[2021-03-11]		8.9 M
	Filed 2021-02-18 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - MNC FII 2020 Series	[2021-03-11]		1.5 M
	Filed 2020-12-09 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP - FT 2021 Series	[2021-02-16]		3.2 M
	Filed 2021-01-15 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
PE	William Blair MB Investments LP -- NPC OFI 2020 Series	[2020-10-05]		3.9 M
	Filed 2020-09-29 (D) · Exemption 506(b), 3(c), 3(c)(1), 3(c)(7) · Remaining Indefinite · Duration One year or less · Revenue Decline to Disclose
Other	William Blair Japan Fund LLC	[2015-03-31]	7.0 M
	Offered $100,000,000 · Filed 2015-01-29 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Minimum $250,000 · Remaining $93,050,000 · Duration One year or less · Net Assets Decline to Disclose
Other	William Blair China A-Share Fund LLC	[2013-03-28]	149.5 M
	Filed 2016-08-01 (D/A) · Exemption 506(b), 3(c), 3(c)(7) · Remaining Indefinite · Duration One year or less · Net Assets Decline to Disclose
PE	WB Internet Fund 2000 LLC Closed to New Investors	2012-03-30		0.5 M
PE	WB Internet Fund 2000 QP LLC Closed to New Investors	2012-03-30		0.6 M
PE	WilBlairCo 1998 LLC Closed to New Investors	2012-03-30		1.5 M
PE	WilBlairCo Associates Closed to New Investors	2012-03-30		32.0 M
Other	WilBlairCo II LLC	2012-03-30		72.0 M
PE	William Blair Capital Partners VII LP Closed to New Investors	2012-03-30		1.5 M
PE	William Blair Capital Partners VII QP Closed to New Investors	2012-03-30		39.7 M
PE	William Blair Capital Partners VI LP Closed to New Investors	2012-03-30		2.2 M
HF	William Blair Commodity Long/Short Fund LLC	[2012-03-30]	13.4 M
	Offered $100,000,000 · Filed 2014-05-08 (D/A) · Exemption 506(b) · Remaining $86,625,652 · Duration One year or less · Net Assets Decline to Disclose
HF	William Blair Multi-Alpha Strategy Fund LLC	[2012-03-30]	49.4 M	26.6 M
	Offered $100,000,000 · Filed 2013-07-24 (D/A) · Exemption 506, 3(c), 3(c)(7) · Remaining $50,638,028 · Duration More than one year · Net Assets Decline to Disclose

AUM Breakdown	Accounts	AUM ($B)
By Client Type
(a) Individuals (other than high net worth individuals)	26,242	7.3
(b) Individuals (high net worth individuals)	9,054	45.4
(c) Banking or thrift institutions	0	0.0
(d) Investment companies	0	0.0
(e) Business development companies	0	0.0
(f) Pooled investment vehicles	1	0.0
(g) Pension and profit sharing plans	364	0.4
(h) Charitable organizations	31	1.8
(i) State or municipal government entities	0	0.0
(j) Other investment advisers	1,146	1.4
(k) Insurance companies	0	0.0
(l) Sovereign wealth funds and foreign official institutions	0	0.0
(m) Corporations or other businesses not listed above	1,333	8.1
(n) Other	0	0.0
Total	39,781	64.3
By Discretionary
Discretionary	38,800	58.1
Non-Discretionary	981	6.2
Total	39,781	64.3
By Non-United States Persons
Non-United States Persons		0.2
United States Persons		64.1
Total	39,781	64.3

Form D Directors	Role	# Filings	# Firms
John Moore	Executive Officer	61	4
Richard Kiphart	Executive Officer	15	4
Advanced Strategies LLC William Blair	Promoter	25	3
Richard Smirl	Executive Officer	25	3
Michelle Seitz	Executive Officer	24	3
Arthur Simon	Executive Officer	15	3
Robert Newman	Executive Officer	15	3
Edgar Jannotta	Executive Officer	5	3
General Partner William Blair MB Investments GP LLC	Promoter	23	2
James Wildman	Director	21	2
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)
Discretionary AUM	$66.8B
Serves	Institutional, Retail
Fund Types	Hedge Fund, Private Equity
LEI	549300J0P7XYE8BMZ775

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
Fort Washington Investment Advisors Inc ✚	OH	93.47 B
TCW Asset Management Company LLC ✚	CA	81.18 B
Metropolitan West Asset Management LLC ✚	CA	78.52 B
PineBridge Investments LLC ✚	NY	76.73 B
Apogem Capital LLC ✚	NY	43.82 B
Investure LLC ✚	VA	38.52 B
First Manhattan Co LLC ✚	NY	38.09 B
Rockefeller & Co LLC ✚	NY	36.76 B
Oppenheimer & Co Inc ✚	NY	36.71 B
Select Equity Group LP ✚	NY	36.38 B

William Blair & Company LLC

Assets, Funds, Holdings