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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
SMIN icon
351
iShares MSCI India Small-Cap ETF
SMIN
$772M
$1.1M ﹤0.01%
15,592
+9,700
+165% +$647K
EPI icon
352
WisdomTree India Earnings Fund ETF
EPI
$2.03B
$1.09M ﹤0.01%
25,450
+4,450
+21% +$190K
IX icon
353
ORIX
IX
$42.4B
$1.05M ﹤0.01%
+27,725
New +$986K
FLEX icon
354
Flex
FLEX
$40.8B
$1.04M ﹤0.01%
6,397
-2,079
-25% -$252K
APO icon
355
Apollo Global Management
APO
$79.7B
$990K ﹤0.01%
8,367
+2,092
+33% +$263K
BBVA icon
356
Banco Bilbao Vizcaya Argentaria
BBVA
$160B
$987K ﹤0.01%
39,404
-4,561
-10% -$104K
GOOG icon
357
Alphabet (Google) Class C
GOOG
$4.19T
$984K ﹤0.01%
2,785
+1,760
+172% +$629K
BCS icon
358
Barclays
BCS
$90.2B
$915K ﹤0.01%
34,068
-6,310
-16% -$152K
COR icon
359
Cencora
COR
$61.5B
$785K ﹤0.01%
2,775
-25,700
-90% -$7.41M
MELI icon
360
Mercado Libre
MELI
$99.7B
$749K ﹤0.01%
441
-74,408
-99% -$127M
ACGL icon
361
Arch Capital
ACGL
$33.7B
$717K ﹤0.01%
7,384
+21
+0.3% +$1.98K
ICE icon
362
Intercontinental Exchange
ICE
$91.1B
$714K ﹤0.01%
5,798
– –
ESI icon
363
Element Solutions
ESI
$8.51B
$704K ﹤0.01%
14,740
-736
-5% -$30.5K
IREN icon
364
Iris Energy
IREN
$12.7B
$682K ﹤0.01%
14,913
– –
JBHT icon
365
JB Hunt Transport Services
JBHT
$24.5B
$546K ﹤0.01%
1,888
-243
-11% -$62.4K
ALSN icon
366
Allison Transmission
ALSN
$10.4B
$535K ﹤0.01%
4,746
+20
+0.4% +$2.43K
JBL icon
367
Jabil
JBL
$31.6B
$516K ﹤0.01%
1,339
+7
+0.5% +$2.42K
NI icon
368
NiSource
NI
$19.5B
$508K ﹤0.01%
10,686
+48
+0.5% +$2.27K
REG icon
369
Regency Centers
REG
$13.8B
$492K ﹤0.01%
6,168
+31
+0.5% +$2.44K
HST icon
370
Host Hotels & Resorts
HST
$15.3B
$487K ﹤0.01%
20,522
+101
+0.5% +$2.25K
KO icon
371
Coca-Cola
KO
$386B
$484K ﹤0.01%
5,952
-12,168
-67% -$961K
DOV icon
372
Dover
DOV
$26.8B
$483K ﹤0.01%
2,153
+11
+0.5% +$2.4K
STM icon
373
STMicroelectronics
STM
$44B
$459K ﹤0.01%
6,125
-811
-12% -$48.8K
PPL
374
PPL Corp
PPL
$25.7B
$455K ﹤0.01%
12,529
+64
+0.5% +$2.36K
ALLE icon
375
Allegion
ALLE
$13.4B
$455K ﹤0.01%
3,241
+14
+0.4% +$1.9K
13 14
15
16 17

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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.