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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
LZB icon
226
La-Z-Boy
LZB
$1.64B
$28.5M 0.08%
729,163
-270,360
-27% -$11.7M
SANM icon
227
Sanmina
SANM
$11.2B
$28.3M 0.08%
371,831
-17,147
-4% -$1.39M
JBI icon
228
Janus International
JBI
$664M
$28.2M 0.08%
3,923,550
+1,268,689
+48% +$10.1M
WINA icon
229
Winmark
WINA
$1.24B
$28.1M 0.08%
88,436
+3,633
+4% +$1.29M
GEF icon
230
Greif
GEF
$5B
$28.1M 0.08%
510,715
-25,217
-5% -$1.49M
ESRT icon
231
Empire State Realty Trust
ESRT
$817M
$27.8M 0.08%
3,556,411
-163,904
-4% -$1.48M
BMA icon
232
Banco Macro
BMA
$5.1B
$27.6M 0.08%
365,830
-204,544
-36% -$19.1M
OPLN
233
Openlane
OPLN
$4.34B
$27.5M 0.08%
1,427,913
-66,075
-4% -$1.36M
RSI icon
234
Rush Street Interactive
RSI
$2.81B
$27.4M 0.08%
2,553,609
+976,711
+62% +$12.8M
ADTN icon
235
Adtran
ADTN
$665M
$27.4M 0.08%
3,139,103
-1,508,052
-32% -$15.2M
BDC icon
236
Belden
BDC
$5.39B
$27.3M 0.08%
272,022
-13,612
-5% -$1.51M
ONT
237
Onterris Inc
ONT
$576M
$27.1M 0.08%
1,903,388
+434,108
+30% +$8.27M
EXTR icon
238
Extreme Networks
EXTR
$3.2B
$27.1M 0.08%
2,049,582
-91,805
-4% -$1.44M
NEE icon
239
NextEra Energy
NEE
$179B
$27.1M 0.08%
382,162
+22,269
+6% +$1.57M
HAE icon
240
Haemonetics
HAE
$4.16B
$27.1M 0.08%
425,975
-20,283
-5% -$1.38M
MTDR icon
241
Matador Resources
MTDR
$6.5B
$27M 0.08%
528,838
-22,268
-4% -$1.23M
KN icon
242
Knowles
KN
$3.33B
$26.9M 0.08%
1,772,951
-453,810
-20% -$8.12M
XPRO icon
243
Expro Ltd
XPRO
$2.07B
$26.8M 0.08%
2,700,689
-108,993
-4% -$1.34M
STEP icon
244
StepStone Group
STEP
$3.96B
$26.8M 0.08%
512,254
+21,071
+4% +$1.24M
SIGI icon
245
Selective Insurance
SIGI
$5.59B
$26.7M 0.08%
+291,661
New +$25.6M
PPBI
246
DELISTED
Pacific Premier Bancorp
PPBI
$26.6M 0.07%
1,247,861
-65,576
-5% -$1.56M
KLIC icon
247
Kulicke & Soffa
KLIC
$4.98B
$26.3M 0.07%
798,240
+89,799
+13% +$3.68M
EPC icon
248
Edgewell Personal Care
EPC
$1.32B
$26.3M 0.07%
841,817
-36,573
-4% -$1.15M
IPAR icon
249
Interparfums
IPAR
$3.78B
$26M 0.07%
228,339
-5,385
-2% -$715K
CADE
250
DELISTED
Cadence Bank
CADE
$25.9M 0.07%
+853,461
New +$28.3M
8 9
10
11 12

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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.