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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
+26.83%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+960.07%
AUM
$33.3B
AUM Growth
+$2.99B
Cap. Flow
-$2.39B
Cap. Flow %
-7.2%
Top 10 Hldgs %
28.95%
Holding
459
New
46
Increased
119
Reduced
231
Closed
56

Top Buys

Rank Stock Value
1
GE icon
GE Aerospace
GE
+$248M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$247M
3
AMAT icon
Applied Materials
AMAT
+$214M
4
TEVA icon
Teva Pharmaceuticals
TEVA
+$172M
5
CNQ icon
Canadian Natural Resources
CNQ
+$165M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$444M
2
MSFT icon
Microsoft
MSFT
+$343M
3
AMZN icon
Amazon
AMZN
+$295M
4
TSM icon
TSMC
TSM
+$236M
5
TWST icon
Twist Bioscience
TWST
+$201M

Sector Composition

Rank Sector Weight
1 Technology 37.42%
2 Healthcare 13.71%
3 Industrials 12.98%
4 Financials 10.06%
5 Consumer Discretionary 8.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PENG
176
Penguin Solutions Inc
PENG
$2.54B
$34.2M 0.1%
450,030
-516,134
-53% -$23.5M
FN icon
177
Fabrinet
FN
$14.8B
$33.5M 0.1%
59,519
-105,311
-64% -$67.9M
HWC icon
178
Hancock Whitney
HWC
$6.02B
$33.4M 0.1%
446,909
-120,039
-21% -$8.21M
THG icon
179
Hanover Insurance
THG
$7.93B
$33M 0.1%
154,277
-41,483
-21% -$7.85M
RNST icon
180
Renasant Corp
RNST
$3.76B
$32.9M 0.1%
772,965
-207,855
-21% -$8.4M
BCO icon
181
Brink's
BCO
$4.57B
$32.7M 0.1%
346,434
+13,147
+4% +$1.37M
BKV
182
BKV Corp
BKV
$2.65B
$32.7M 0.1%
1,194,790
+41,023
+4% +$1.13M
ZETA icon
183
Zeta Global
ZETA
$7.67B
$32.5M 0.1%
1,652,800
+58,374
+4% +$1.08M
VVV icon
184
Valvoline
VVV
$4.1B
$32.5M 0.1%
821,239
-137,029
-14% -$4.76M
IDA icon
185
Idacorp
IDA
$7.85B
$32.3M 0.1%
213,462
-9,025
-4% -$1.3M
DPC
186
DPC Holdings PLC
DPC
$6.59B
$31.4M 0.09%
+640,005
New +$31.2M
USPH icon
187
US Physical Therapy
USPH
$1.17B
$30M 0.09%
436,996
+59,133
+16% +$4.02M
KRG icon
188
Kite Realty
KRG
$5.21B
$29.7M 0.09%
1,047,774
-277,486
-21% -$7.46M
AIN icon
189
Albany International
AIN
$1.66B
$29.5M 0.09%
396,468
-105,547
-21% -$6.61M
WH icon
190
Wyndham Hotels & Resorts
WH
$5.64B
$29M 0.09%
344,134
-91,431
-21% -$7.58M
AVT icon
191
Avnet
AVT
$7.27B
$28.9M 0.09%
324,846
-231,924
-42% -$19M
SIGI icon
192
Selective Insurance
SIGI
$5.51B
$28.4M 0.09%
292,525
-77,894
-21% -$6.73M
CIB icon
193
Grupo Cibest SA
CIB
$23B
$28.3M 0.09%
+356,370
New +$25.7M
CSTM icon
194
Constellium
CSTM
$3.66B
$28.1M 0.08%
882,306
-35,784
-4% -$1.16M
AIT icon
195
Applied Industrial Technologies
AIT
$11.8B
$28M 0.08%
82,717
-3,546
-4% -$1.09M
HWKN icon
196
Hawkins
HWKN
$2.51B
$27.2M 0.08%
191,502
+26,233
+16% +$4.15M
FRME icon
197
First Merchants
FRME
$2.63B
$27.2M 0.08%
622,443
-167,439
-21% -$6.8M
WBI
198
WaterBridge Infrastructure LLC
WBI
$1.74B
$26.9M 0.08%
+783,780
New +$22.8M
HAYW icon
199
Hayward Holdings
HAYW
$3B
$26.8M 0.08%
1,549,861
+555,632
+56% +$8.11M
GPOR icon
200
Gulfport Energy Corp
GPOR
$3.12B
$26.6M 0.08%
156,661
-42,184
-21% -$7.62M
6 7
8
9 10

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William Blair Investment Management's Q2 2026 Portfolio in Review

As of Q2 2026, William Blair Investment Management held 459 positions worth $33.3B, up 9.9% from $30.3B the previous quarter. Its ten largest holdings account for 29% of the portfolio.

William Blair Investment Management withdrew a net $2.39B in Q2 2026, closing 56 positions and reducing 231 holdings. Its most notable exit was Coherent, an estimated $159M position sold in full.

By sector, the portfolio is most concentrated in Technology at 37% of assets, up from 36% a quarter earlier, followed by Healthcare and Industrials.

Against the trend, William Blair Investment Management opened a new position in GE Aerospace worth $296M.

  • William Blair Investment Management's largest Q2 2026 buy was GE Aerospace: 790,801 shares worth $296M.
  • William Blair Investment Management added most to Alphabet (Google) Class A in Q2 2026, an estimated $247M increase.
  • William Blair Investment Management's biggest Q2 2026 reduction was Apple, cutting an estimated $444M.
  • William Blair Investment Management fully exited Coherent in Q2 2026, selling an estimated $159M.
  • William Blair Investment Management's ten largest holdings make up 29% of its $33.3B portfolio in Q2 2026.
  • William Blair Investment Management opened 46 new positions and closed 56 in Q2 2026.
  • William Blair Investment Management's portfolio value rose 9.9% quarter-over-quarter to $33.3B.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.