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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
WNS
126
DELISTED
WNS Holdings
WNS
$68.2M 0.19%
1,109,041
-3,702
-0.3% -$211K
LSCC icon
127
Lattice Semiconductor
LSCC
$18.4B
$65.6M 0.18%
1,250,434
-398,778
-24% -$23.7M
PSN icon
128
Parsons
PSN
$5.16B
$64.9M 0.18%
1,095,474
+427,334
+64% +$30.9M
DBD icon
129
Diebold Nixdorf
DBD
$2.44B
$64.8M 0.18%
1,482,352
+209,589
+16% +$9.13M
NU icon
130
Nu Holdings
NU
$65.5B
$64.4M 0.18%
6,288,910
+262,688
+4% +$3.1M
MMSI icon
131
Merit Medical Systems
MMSI
$5.45B
$63.6M 0.18%
601,644
-85,387
-12% -$8.81M
MRX
132
Marex Group Limited Ordinary Shares
MRX
$5.12B
$59.2M 0.17%
1,676,359
-828,367
-33% -$28.8M
YPF icon
133
YPF Sociedad Anonima American Depositary Shares (Each representing ten (10) Class D shares of Capital Stock)
YPF
$19.2B
$58.9M 0.17%
1,680,840
+606,591
+56% +$23.2M
GGAL icon
134
Galicia Financial Group
GGAL
$7.1B
$58.6M 0.16%
1,076,264
+175,199
+19% +$10.9M
TECH icon
135
Bio-Techne
TECH
$11.3B
$58M 0.16%
990,099
-84,784
-8% -$5.75M
FOXF icon
136
Fox Factory Holding Corp
FOXF
$913M
$57.8M 0.16%
2,476,501
-506,981
-17% -$13.6M
VCEL icon
137
Vericel Corp
VCEL
$2.29B
$57.3M 0.16%
1,285,086
+26,670
+2% +$1.44M
RUSHA icon
138
Rush Enterprises Class A
RUSHA
$9.41B
$57.2M 0.16%
1,070,310
+443,042
+71% +$25.4M
GRAB icon
139
Grab
GRAB
$14.7B
$56.4M 0.16%
+12,442,630
New +$58.1M
IDA icon
140
Idacorp
IDA
$8.21B
$55.4M 0.16%
476,393
+96,325
+25% +$10.8M
VIST icon
141
Vista Energy
VIST
$7.32B
$54M 0.15%
1,159,279
+137,107
+13% +$7.09M
ADC icon
142
Agree Realty
ADC
$9.25B
$52M 0.15%
673,236
-18,281
-3% -$1.34M
WMT icon
143
Walmart Inc
WMT
$923B
$50.4M 0.14%
574,624
+130,692
+29% +$12.3M
VRRM icon
144
Verra Mobility
VRRM
$714M
$50.2M 0.14%
2,229,942
-624,342
-22% -$15M
AIN icon
145
Albany International
AIN
$1.81B
$49.9M 0.14%
722,349
+75,254
+12% +$5.85M
CP icon
146
Canadian Pacific Kansas City
CP
$81.5B
$49.4M 0.14%
703,570
-328,610
-32% -$25M
JPM icon
147
JPMorgan Chase
JPM
$971B
$48.9M 0.14%
199,539
+56,577
+40% +$14.4M
BCPC
148
Balchem Corp
BCPC
$5.73B
$47.5M 0.13%
286,133
+11,588
+4% +$1.9M
ATAT icon
149
Atour Lifestyle Holdings
ATAT
$4.6B
$46.5M 0.13%
1,639,155
+730,463
+80% +$20.9M
ASO icon
150
Academy Sports + Outdoors
ASO
$3.05B
$45.2M 0.13%
991,450
+80,581
+9% +$4.14M
4 5
6
7 8

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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.