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Latest WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Stock Portfolio

$30.26Billion– No. of Holdings #412

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Performance:
2026 Q1: -4.29%YTD: -4.29%2025: 8.96%
Performance for 2026 Q1 is -4.29%, and YTD is -4.29%, and 2025 is 8.96%.

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 2026-05-08, the fund reported it's updated stock portfolio. In the 13F Holdings report, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reported an equity portfolio of $30.3 Billions as of 31 Mar, 2026.

The top stock holdings of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC are TSM, NVDA, AAPL. The fund has invested 6.2% of it's portfolio in TAIWAN SEMICONDUCTOR MANUFAC and 5.2% of portfolio in NVIDIA CORPORATION.

The fund managers got completely rid off SEA LTD (SE), WAYSTAR HLDG CORP and AMICUS THERAPEUTICS INC (FOLD) stocks. They significantly reduced their stock positions in CHEMED CORP NEW (CHE), CACI INTL INC (CACI) and ARCH CAP GROUP LTD (ACGL). WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC opened new stock positions in ASTRAZENECA PLC, AKAMAI TECHNOLOGIES INC (AKAM) and BORGWARNER INC (BWA). The fund showed a lot of confidence in some stocks as they added substantially to GOLD FIELDS LTD (GFI), MILLICOM INTL CELLULAR S A (TIGO) and RYANAIR HOLDINGS PLC (RYAAY).
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Equity Portfolio Value
Last Reported on: 08 May, 2026

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 -4.29% in the last quarter. In trailing 12 months, it's portfolio return was 13.14%.
  • Performance
  • S&P 500

New Buys

Ticker$ Bought
astrazeneca plc377,341,000
akamai technologies inc185,949,000
borgwarner inc156,489,000
amphenol corp136,134,000
power integrations inc121,891,000
synaptics inc111,101,000
littelfuse inc103,358,000
national bk hldgs corp96,915,600
New stocks bought by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Additions

Ticker% Inc.
gold fields ltd3,891
millicom intl cellular s a1,022
ryanair holdings plc726
sterling infrastructure inc683
totalenergies se417
ishares tr404
i3 verticals inc204
stepstone group inc185
Additions to existing portfolio by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Reductions

Ticker% Reduced
chemed corp new-99.78
caci intl inc-99.02
arch cap group ltd-98.75
oracle corp-95.57
stellar bancorp inc-93.24
enterprise finl svcs corp-90.68
korn ferry-90.38
q2 hldgs inc-88.79
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reduced stake in above stock

Sold off

Ticker$ Sold
amicus therapeutics inc-151,339,000
blue owl capital inc-113,782,000
clearwater analytics hldgs i-141,838,000
waystar hldg corp-172,993,000
tencent music entmt group-62,964,900
exlservice holdings inc-109,668,000
sea ltd-302,415,000
cadence bank-91,569,700
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC got rid off the above stocks

Sector Distribution

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has about 28.9% of it's holdings in Technology sector.

  • Technology
  • Others
  • Industrials
  • Healthcare
  • Consumer Cyclical
  • Financial Services
  • Communication Services
  • Basic Materials
  • Consumer Defensive
Sector%
Technology28.9
Others18.9
Industrials12.1
Healthcare10.6
Consumer Cyclical8.1
Financial Services7.6
Communication Services4.5
Basic Materials3.5
Consumer Defensive3.3

Market Cap. Distribution

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC has about 55.6% of it's portfolio invested in the large-cap and mega-cap stocks.

  • LARGE-CAP
  • MEGA-CAP
  • MID-CAP
  • UNALLOCATED
  • SMALL-CAP
Category%
LARGE-CAP28.2
MEGA-CAP27.4
MID-CAP21.3
UNALLOCATED19
SMALL-CAP4

Stocks belong to which Index?

About 60.7% of the stocks held by WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC either belong to S&P 500 or RUSSELL 2000 index.

  • Others
  • S&P 500
  • RUSSELL 2000
Index%
Others39.4
S&P 50038
RUSSELL 200022.7
Top 5 Winners (%)%
AMPX
amprius technologies inc
96.0 %
AEHR
aehr test sys
81.1 %
PBF
pbf energy inc
68.5 %
AGX
argan inc
59.4 %
aura minerals inc
57.6 %
Top 5 Winners ($)$
TSM
taiwan semiconductor manufac
196.7 M
CIEN
ciena corp
115.6 M
TWST
twist bioscience corp
88.7 M
ONTO
onto innovation inc
63.5 M
cava group inc
53.5 M
Top 5 Losers (%)%
SMFR
genedx holdings corp
-49.6 %
DOCS
doximity inc
-44.7 %
QTRX
quanterix corp
-44.4 %
INSP
inspire med sys inc
-43.6 %
VERX
vertex inc
-39.9 %
Top 5 Losers ($)$
MSFT
microsoft corp
-362.3 M
NVDA
nvidia corporation
-118.4 M
INTU
intuit
-112.3 M
NOW
servicenow inc
-109.9 M
DOCS
doximity inc
-108.0 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 30.6% of the portfolio is in top 10 stocks. MSFT proved to be the most loss making stock for the portfolio. TSM was the most profitable stock for WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC last quarter.

Last Reported on: 08 May, 2026
TickerNamesorted ascending% PortfolioShares Held$ ValueType% ChangeOptions