Latest WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Stock Portfolio

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Performance:

2025 Q4: -1.75%YTD: -0.1%2024: 14.94%

Performance for 2025 Q4 is -1.75%, and YTD is -0.1%, and 2024 is 14.94%.

About WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC and 13F Hedge Fund Stock Holdings

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC is a hedge fund based in Chicago, IL. On 2026-02-09, the fund reported it's updated stock portfolio. In the 13F Holdings report, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reported an equity portfolio of $35.9 Billions as of 31 Dec, 2025.

The top stock holdings of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC are NVDA, TSM, MSFT. The fund has invested 5.5% of it's portfolio in NVIDIA CORPORATION and 5.1% of portfolio in TAIWAN SEMICONDUCTOR MFG LTD.

The fund managers got completely rid off LIVE NATION ENTERTAINMENT IN (LYV), STRIDE INC (LRN) and CONFLUENT INC (CFLT) stocks. They significantly reduced their stock positions in GOGO INC (GOGO), ROYAL BK CDA and COLUMBIA BKG SYS INC (COLB). WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC opened new stock positions in ARGENX SE, HEALTHEQUITY INC (HQY) and LINCOLN ELEC HLDGS INC (LECO). The fund showed a lot of confidence in some stocks as they added substantially to DONALDSON INC (DCI), VERTEX PHARMACEUTICALS INC (VRTX) and BLACKSTONE INC (BX).

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Annual Return Estimates Vs S&P 500

Our best estimate is that WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC made a return of -1.75% in the last quarter. In trailing 12 months, it's portfolio return was -0.1%.

Performance
S&P 500

New Buys

Ticker	$ Bought
argenx se	188,071,000
healthequity inc	169,956,000
lincoln elec hldgs inc	146,135,000
f5 inc	140,460,000
halozyme therapeutics inc	124,031,000
blue owl capital inc	113,782,000
penumbra inc	107,567,000
verisk analytics inc	89,375,600

New stocks bought by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Additions

Ticker	% Inc.
donaldson inc	26,235
vertex pharmaceuticals inc	6,566
blackstone inc	3,176
motorola solutions inc	606
netflix inc	588
marvell technology inc	480
servicenow inc	474
marex group plc	371

Additions to existing portfolio by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Reductions

Ticker	% Reduced
gogo inc	-99.57
royal bk cda	-99.19
columbia bkg sys inc	-98.78
uber technologies inc	-97.94
csg sys intl inc	-96.72
salesforce inc	-94.91
lam research corp	-94.00
makemytrip limited mauritius	-93.62

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reduced stake in above stock

Sold off

Ticker	$ Sold
confluent inc	-169,682,000
neogen corp	-33,729,200
evolent health inc	-34,140,100
exact sciences corp	-139,787,000
coupang inc	-71,011,700
fox factory hldg corp	-52,263,800
brightview hldgs inc	-25,565,400
pebblebrook hotel tr	-19,113,900

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC got rid off the above stocks

Sector Distribution

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has about 31.4% of it's holdings in Technology sector.

Sector	%
Technology	31.4
Others	17
Healthcare	11.4
Industrials	10.2
Consumer Cyclical	8.4
Financial Services	8
Communication Services	5.1
Consumer Defensive	3.1
Basic Materials	2.7
Real Estate	1.3

Market Cap. Distribution

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has about 50.2% of it's portfolio invested in the large-cap and mega-cap stocks.

Category	%
MEGA-CAP	30.7
MID-CAP	28.1
LARGE-CAP	19.5
UNALLOCATED	17
SMALL-CAP	4.6

Stocks belong to which Index?

About 60.9% of the stocks held by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC either belong to S&P 500 or RUSSELL 2000 index.

Index	%
S&P 500	40.2
Others	39.2
RUSSELL 2000	20.7

Top 5 Winners (%)		%
LITE	lumentum hldgs inc	95.5 %
FOLD	amicus therapeutics inc	67.6 %
ESTA	establishment labs hldgs inc	63.4 %
COHR	coherent corp	58.5 %
HAE	haemonetics corp mass	53.5 %

Top 5 Winners ($)		$
GOOG	alphabet inc	197.2 M
CIEN	ciena corp	156.1 M
TSM	taiwan semiconductor mfg ltd	152.5 M
AAPL	apple inc	95.3 M
COHR	coherent corp	86.0 M

Top 5 Losers (%)		%
NFLX	netflix inc	-87.1 %
NOW	servicenow inc	-74.6 %
ELF	e l f beauty inc	-42.0 %
TMCI	treace med concepts inc	-41.8 %
DOCS	doximity inc	-38.2 %

Top 5 Losers ($)		$
NOW	servicenow inc	-967.6 M
DOCS	doximity inc	-162.9 M
SE	sea ltd	-149.3 M
MSFT	microsoft corp	-125.8 M
ORCL	oracle corp	-102.0 M

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Holdings Map

This heatmap illustrates the top 50 positions within the fund's portfolio.

Current Stock Holdings of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has 412 stocks in it's portfolio. About 32.6% of the portfolio is in top 10 stocks. NOW proved to be the most loss making stock for the portfolio. GOOG was the most profitable stock for WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC last quarter.

Last Reported on: 09 Feb, 2026

Ticker	Namesorted ascending	% Portfolio	Shares Held	$ Value	Type	% Change
A	agilent technologies inc	0.78	2,063,010	280,714,000	reduced	-3.78

AAPL	apple inc	4.13	5,444,330	1,480,100,000	reduced	-3.13

ABC	cencora inc	0.02	24,356	8,226,240	reduced	-30.22

ABCB	ameris bancorp	0.07	362,194	26,900,100	reduced	-44.92

ABM	abm inds inc	0.06	471,120	19,928,400	reduced	-30.96

ABT	abbott labs	0.02	45,135	5,654,920	reduced	-3.61

ACGL	arch cap group ltd	0.16	588,845	56,482,000	reduced	-14.55

ACHC	acadia healthcare company in	0.00	0.00	0.00	sold off	-100

ACN	accenture plc ireland	0.00	1,290	346,107	reduced	-7.13

ACSG	dbx etf tr	0.01	90,037	2,957,720	reduced	-11.36

ACVA	acv auctions inc	0.24	10,891,700	87,351,300	reduced	-5.06

ADC	agree rlty corp	0.07	352,710	25,405,700	reduced	-6.69

ADMA	adma biologics inc	0.04	890,861	16,249,300	new

ADTN	adtran holdings inc	0.06	2,478,620	21,539,200	reduced	-9.42

AEHR	aehr test sys	0.03	495,672	10,007,600	reduced	-44.56

AFG	american finl group inc ohio	0.00	1,642	224,429	reduced	-25.19

AGX	argan inc	0.06	63,361	19,852,300	reduced	-11.45

AGYS	agilysys inc	0.19	572,600	68,047,800	added	1.13

AGZD	wisdomtree tr	0.00	21,000	972,090	unchanged	0.00

AIN	albany intl corp	0.07	483,935	24,535,500	reduced	-44.78