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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $33.3B
1-Year Est. Return 44.76%
This Fund
S&P 500
This Quarter Est. Return
-6.4%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+978.6%
AUM
$35.6B
AUM Growth
-$5.32B
Cap. Flow
-$1.91B
Cap. Flow %
-5.36%
Top 10 Hldgs %
26.78%
Holding
469
New
36
Increased
114
Reduced
269
Closed
46

Top Buys

Rank Stock Value
1
AVGO icon
Broadcom
AVGO
+$515M
2
SE icon
Sea Limited
SE
+$179M
3
TYL icon
Tyler Technologies
TYL
+$177M
4
WAY
Waystar Holding Corp
WAY
+$167M
5
CIEN icon
Ciena
CIEN
+$159M

Top Sells

Rank Stock Value
1
AMD icon
Advanced Micro Devices
AMD
+$229M
2
ACN icon
Accenture
ACN
+$222M
3
PEN icon
Penumbra
PEN
+$210M
4
CF icon
CF Industries
CF
+$201M
5
TXN icon
Texas Instruments
TXN
+$184M

Sector Composition

Rank Sector Weight
1 Technology 32.57%
2 Consumer Discretionary 15.58%
3 Financials 13.1%
4 Healthcare 12.15%
5 Industrials 9.67%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TYL icon
51
Tyler Technologies
TYL
$12.9B
$179M 0.5%
308,559
+297,728
+2,749% +$177M
MLI icon
52
Mueller Industries
MLI
$15.1B
$179M 0.5%
4,711,942
-363,054
-7% -$14.5M
EHC icon
53
Encompass Health
EHC
$12.3B
$179M 0.5%
1,763,468
-98,751
-5% -$9.64M
PLNT icon
54
Planet Fitness
PLNT
$3.64B
$178M 0.5%
1,843,687
-179,533
-9% -$18.1M
DDOG icon
55
Datadog
DDOG
$86.4B
$177M 0.5%
1,785,749
+573,887
+47% +$72.4M
INSM icon
56
Insmed
INSM
$28.9B
$176M 0.5%
2,313,217
-120,226
-5% -$9.2M
WAL icon
57
Western Alliance Bancorporation
WAL
$8.99B
$176M 0.49%
2,292,632
-272,934
-11% -$22.9M
CGNX icon
58
Cognex
CGNX
$10.3B
$167M 0.47%
5,597,851
-242,266
-4% -$8.53M
GMED icon
59
Globus Medical
GMED
$11.4B
$166M 0.47%
2,273,787
+1,041,144
+84% +$86M
PODD icon
60
Insulet
PODD
$9.95B
$165M 0.46%
628,537
-47,772
-7% -$12.9M
POOL icon
61
Pool Corp
POOL
$7.28B
$164M 0.46%
514,937
-38,524
-7% -$13.1M
FTAI icon
62
FTAI Aviation
FTAI
$23.6B
$158M 0.44%
1,424,978
+214,396
+18% +$25.3M
WAY
63
Waystar Holding Corp
WAY
$4.71B
$158M 0.44%
+4,227,425
New +$167M
QTWO icon
64
Q2 Holdings
QTWO
$3.82B
$157M 0.44%
1,967,187
-46,181
-2% -$4.07M
ACVA icon
65
ACV Auctions
ACVA
$1.37B
$156M 0.44%
11,076,909
-1,022,777
-8% -$18.8M
CW icon
66
Curtiss-Wright
CW
$26.8B
$154M 0.43%
485,212
+111,482
+30% +$37.6M
GTLS
67
DELISTED
Chart Industries
GTLS
$150M 0.42%
1,042,446
-50,427
-5% -$9.29M
TWST icon
68
Twist Bioscience
TWST
$7.81B
$149M 0.42%
3,806,867
+857,144
+29% +$38.6M
WSC icon
69
WillScot Mobile Mini Holdings
WSC
$4.08B
$147M 0.41%
5,282,161
-273,320
-5% -$9.29M
VEEV icon
70
Veeva Systems
VEEV
$38.7B
$146M 0.41%
628,291
-168,013
-21% -$38.4M
ELF icon
71
e.l.f. Beauty
ELF
$5.57B
$143M 0.4%
2,277,639
-27,710
-1% -$2.41M
MLM icon
72
Martin Marietta Materials
MLM
$32.7B
$140M 0.39%
292,752
-145,450
-33% -$73.9M
CCJ icon
73
Cameco
CCJ
$43.5B
$138M 0.39%
3,362,624
-697,727
-17% -$32.8M
ACHC icon
74
Acadia Healthcare
ACHC
$2.97B
$133M 0.37%
4,398,555
+770,512
+21% +$29.4M
APO icon
75
Apollo Global Management
APO
$82B
$129M 0.36%
945,205
-454,155
-32% -$69.8M
1 2
3
4 5

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William Blair Investment Management's Q1 2025 Portfolio in Review

As of Q1 2025, William Blair Investment Management held 469 positions worth $35.6B, down 13% from $40.9B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair Investment Management withdrew a net $1.91B in Q1 2025, closing 46 positions and reducing 269 holdings. Its most notable exit was Penumbra, an estimated $210M position sold in full.

By sector, the portfolio is most concentrated in Technology at 33% of assets, down from 34% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Waystar Holding Corp worth $158M.

  • William Blair Investment Management's largest Q1 2025 buy was Waystar Holding Corp: 4,227,425 shares worth $158M.
  • William Blair Investment Management added most to Broadcom in Q1 2025, an estimated $515M increase.
  • William Blair Investment Management's biggest Q1 2025 reduction was Advanced Micro Devices, cutting an estimated $229M.
  • William Blair Investment Management fully exited Penumbra in Q1 2025, selling an estimated $210M.
  • William Blair Investment Management's ten largest holdings make up 27% of its $35.6B portfolio in Q1 2025.
  • William Blair Investment Management opened 36 new positions and closed 46 in Q1 2025.
  • William Blair Investment Management's portfolio value fell 13% quarter-over-quarter to $35.6B.

Based on William Blair Investment Management's 13F filing for Q1 2025, filed 9 May 2025.