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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
+10.81%
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
$38.7B
AUM Growth
+$994M
Cap. Flow
-$1.59B
Cap. Flow %
-4.12%
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48

Top Buys

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$445M
2
NU icon
Nu Holdings
NU
+$175M
3
BSY icon
Bentley Systems
BSY
+$161M
4
CAVA icon
CAVA Group
CAVA
+$143M
5
SNOW icon
Snowflake
SNOW
+$111M

Top Sells

Rank Stock Value
1
DDOG icon
Datadog
DDOG
+$298M
2
AMZN icon
Amazon
AMZN
+$222M
3
META icon
Meta Platforms (Facebook)
META
+$181M
4
TLN
Talen Energy Corp
TLN
+$152M
5
EPAM icon
EPAM Systems
EPAM
+$149M

Sector Composition

Rank Sector Weight
1 Technology 38.52%
2 Consumer Discretionary 12.99%
3 Financials 12.96%
4 Healthcare 10.56%
5 Industrials 9.02%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ANIP icon
201
ANI Pharmaceuticals
ANIP
$1.73B
$31.9M 0.08%
348,680
-141,856
-29% -$11.6M
RNST icon
202
Renasant Corp
RNST
$3.96B
$31.8M 0.08%
862,198
-52,314
-6% -$1.98M
FRME icon
203
First Merchants
FRME
$2.72B
$31.8M 0.08%
843,174
+118,495
+16% +$4.73M
KRG icon
204
Kite Realty
KRG
$5.27B
$31.6M 0.08%
1,417,086
-85,711
-6% -$1.91M
SRAD icon
205
Sportradar
SRAD
$3.84B
$31.6M 0.08%
1,174,034
-98,758
-8% -$2.93M
MMS icon
206
Maximus
MMS
$2.85B
$31.6M 0.08%
345,310
-115,925
-25% -$9.39M
HURN icon
207
Huron Consulting
HURN
$2.39B
$31.5M 0.08%
214,728
-13,045
-6% -$1.78M
ABM icon
208
ABM Industries
ABM
$2.84B
$31.5M 0.08%
682,365
-41,347
-6% -$1.96M
AVT icon
209
Avnet
AVT
$7.98B
$31M 0.08%
593,707
-13,844
-2% -$745K
SR icon
210
Spire
SR
$4.89B
$30.5M 0.08%
374,050
+88,154
+31% +$6.71M
HAYW icon
211
Hayward Holdings
HAYW
$3.25B
$30.4M 0.08%
+2,010,740
New +$30.8M
BRC icon
212
Brady Corp
BRC
$4.48B
$30.4M 0.08%
389,376
-23,614
-6% -$1.75M
RMBS icon
213
Rambus
RMBS
$11B
$30.3M 0.08%
+291,182
New +$22.4M
AIT icon
214
Applied Industrial Technologies
AIT
$13B
$30.2M 0.08%
115,557
+515
+0.4% +$135K
LXP icon
215
LXP Industrial Trust
LXP
$3.58B
$29.9M 0.08%
667,710
-40,494
-6% -$1.74M
TNET icon
216
TriNet
TNET
$3.07B
$29.8M 0.08%
445,269
+53,683
+14% +$3.65M
UMBF icon
217
UMB Financial
UMBF
$11.4B
$29.5M 0.08%
+249,126
New +$28.7M
LNTH icon
218
Lantheus
LNTH
$6.57B
$29.5M 0.08%
574,681
+183,059
+47% +$11.4M
ALK icon
219
Alaska Air
ALK
$5.29B
$29.4M 0.08%
590,281
-35,483
-6% -$1.97M
USPH icon
220
US Physical Therapy
USPH
$1.22B
$29.4M 0.08%
+345,859
New +$27.7M
DBRG icon
221
DigitalBridge
DBRG
$2.95B
$29.2M 0.08%
2,498,914
-151,206
-6% -$1.69M
CLS icon
222
Celestica
CLS
$42.8B
$28.9M 0.07%
+117,396
New +$23.7M
BDC icon
223
Belden
BDC
$5.39B
$28.5M 0.07%
237,296
-14,345
-6% -$1.81M
ULS icon
224
UL Solutions
ULS
$15.5B
$28.5M 0.07%
402,210
-38,685
-9% -$2.64M
ITGR icon
225
Integer Holdings
ITGR
$4.25B
$28.5M 0.07%
+275,421
New +$30M
7 8
9
10 11

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William Blair Investment Management's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.

By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.

  • William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
  • William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
  • William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
  • William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
  • William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
  • William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.