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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
CP icon
151
Canadian Pacific Kansas City
CP
$81.8B
$43.8M 0.11%
588,336
-23,029
-4% -$1.76M
USLM icon
152
United States Lime & Minerals
USLM
$3.45B
$43.8M 0.11%
333,100
-24,590
-7% -$2.84M
TMHC
153
DELISTED
Taylor Morrison
TMHC
$42.9M 0.11%
650,223
-39,292
-6% -$2.59M
JLL icon
154
Jones Lang LaSalle
JLL
$16.7B
$42.7M 0.11%
143,274
+28,617
+25% +$8.17M
ESTA icon
155
Establishment Labs
ESTA
$2.27B
$41.7M 0.11%
1,017,543
+152,299
+18% +$6.22M
BCPC
156
Balchem Corp
BCPC
$5.77B
$41.3M 0.11%
275,475
+39,450
+17% +$6.22M
HR icon
157
Healthcare Realty
HR
$6.6B
$41.3M 0.11%
2,288,391
+9,582
+0.4% +$162K
SMPL icon
158
Simply Good Foods
SMPL
$961M
$41.1M 0.11%
1,654,737
+108,638
+7% +$3.21M
STEP icon
159
StepStone Group
STEP
$3.98B
$40.7M 0.11%
623,919
+88,794
+17% +$5.42M
JBTM
160
JBT Marel
JBTM
$6.13B
$40.5M 0.1%
288,504
+408
+0.1% +$55.8K
CGNX icon
161
Cognex
CGNX
$10.2B
$40.2M 0.1%
888,275
+119,188
+15% +$4.82M
RVLV icon
162
Revolve Group
RVLV
$1.69B
$39.2M 0.1%
1,841,578
+65,843
+4% +$1.44M
ELS icon
163
Equity Lifestyle Properties
ELS
$12.4B
$38.7M 0.1%
638,355
+3,194
+0.5% +$194K
GPOR icon
164
Gulfport Energy Corp
GPOR
$2.99B
$38.4M 0.1%
212,145
-12,827
-6% -$2.23M
HLIO icon
165
Helios Technologies
HLIO
$2.65B
$38.4M 0.1%
735,721
+105,334
+17% +$4.92M
EBC icon
166
Eastern Bankshares
EBC
$5.34B
$37.9M 0.1%
2,088,278
-126,538
-6% -$2.09M
EWBC icon
167
East-West Bancorp
EWBC
$18.5B
$37.7M 0.1%
353,960
+290
+0.1% +$30.5K
SANM icon
168
Sanmina
SANM
$11.3B
$37.3M 0.1%
324,018
-19,715
-6% -$2.22M
SBCF icon
169
Seacoast Banking Corp of Florida
SBCF
$3.45B
$37.2M 0.1%
1,222,755
-74,181
-6% -$2.2M
ALHC icon
170
Alignment Healthcare
ALHC
$2.79B
$37M 0.1%
2,119,952
+641,381
+43% +$9.51M
HWC icon
171
Hancock Whitney
HWC
$6.35B
$36.8M 0.1%
587,171
-35,593
-6% -$2.18M
PI icon
172
Impinj
PI
$5.46B
$36.3M 0.09%
+200,605
New +$31.6M
AUB icon
173
Atlantic Union Bankshares
AUB
$6.08B
$36M 0.09%
1,021,450
+48,270
+5% +$1.64M
KN icon
174
Knowles
KN
$3.34B
$36M 0.09%
1,546,295
-93,772
-6% -$1.92M
ONT
175
Onterris Inc
ONT
$567M
$36M 0.09%
1,310,251
-1,007,409
-43% -$26.3M
5 6
7
8 9

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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.