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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
DIOD icon
251
Diodes
DIOD
$4.93B
$25.8M 0.07%
597,726
+121,463
+26% +$6.56M
TMCI icon
252
Treace Medical Concepts
TMCI
$309M
$25.7M 0.07%
3,060,612
+121,764
+4% +$1.09M
OC icon
253
Owens Corning
OC
$12.3B
$25.5M 0.07%
178,264
-4,540
-2% -$750K
VERX icon
254
Vertex
VERX
$2B
$25.5M 0.07%
+726,949
New +$33.2M
WAFD icon
255
WaFd
WAFD
$2.79B
$25.4M 0.07%
888,770
-40,990
-4% -$1.22M
USLM icon
256
United States Lime & Minerals
USLM
$3.42B
$25.4M 0.07%
287,233
+11,042
+4% +$1.15M
DBRG icon
257
DigitalBridge
DBRG
$2.95B
$25.3M 0.07%
2,863,421
-139,641
-5% -$1.47M
EMBC icon
258
Embecta
EMBC
$269M
$25.2M 0.07%
1,978,372
+1,238,911
+168% +$19.8M
CENTA icon
259
Central Garden & Pet Co Class A
CENTA
$2.43B
$25.2M 0.07%
768,425
-37,139
-5% -$1.18M
MIR icon
260
Mirion Technologies
MIR
$3.79B
$25.1M 0.07%
1,731,391
-1,309,625
-43% -$20.6M
MTG icon
261
MGIC Investment
MTG
$6.29B
$24.9M 0.07%
1,004,451
-360,274
-26% -$8.73M
AJG icon
262
Arthur J. Gallagher & Co
AJG
$65.5B
$24.7M 0.07%
71,667
+19,043
+36% +$6.02M
OSW icon
263
OneSpaWorld
OSW
$2.7B
$24.7M 0.07%
1,471,732
-330,367
-18% -$6.42M
PWP icon
264
Perella Weinberg Partners
PWP
$1.28B
$24.5M 0.07%
1,333,883
+97,313
+8% +$2.21M
GVA icon
265
Granite Construction
GVA
$5.52B
$24.4M 0.07%
324,121
-15,046
-4% -$1.26M
SR icon
266
Spire
SR
$4.89B
$24.1M 0.07%
308,143
-152,626
-33% -$11.2M
ODFL icon
267
Old Dominion Freight Line
ODFL
$44.1B
$24.1M 0.07%
145,419
-69,954
-32% -$12.7M
FUTU icon
268
Futu Holdings
FUTU
$14.7B
$24M 0.07%
234,853
-50,267
-18% -$5.15M
VRNT
269
DELISTED
Verint Systems
VRNT
$24M 0.07%
1,346,201
-60,481
-4% -$1.45M
BWXT icon
270
BWX Technologies
BWXT
$15.8B
$24M 0.07%
243,461
-1,107,575
-82% -$120M
VITL icon
271
Vital Farms
VITL
$495M
$24M 0.07%
786,841
-169,054
-18% -$6.08M
OMF icon
272
OneMain Financial
OMF
$7.44B
$23.6M 0.07%
482,649
-403,500
-46% -$21.4M
DSGX icon
273
Descartes Systems
DSGX
$6.65B
$23.5M 0.07%
233,338
+21,316
+10% +$2.36M
INVX
274
Innovex International
INVX
$2.13B
$23.2M 0.07%
1,294,355
-51,530
-4% -$875K
HELE icon
275
Helen of Troy
HELE
$696M
$22.7M 0.06%
423,910
-16,941
-4% -$979K
9 10
11
12 13

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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.