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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
HLIO icon
126
Helios Technologies
HLIO
$2.41B
$74.5M 0.22%
834,221
-96,787
-10% -$7.43M
LRN icon
127
Stride
LRN
$3.61B
$71M 0.21%
+823,698
New +$75.7M
PWP icon
128
Perella Weinberg Partners
PWP
$1.26B
$70.1M 0.21%
4,390,541
+314,228
+8% +$5.75M
APG icon
129
APi Group
APG
$17.2B
$69.9M 0.21%
1,649,980
-90,469
-5% -$3.95M
KMT icon
130
Kennametal
KMT
$2.25B
$69.6M 0.21%
1,986,136
-496,399
-20% -$18.1M
JBTM
131
JBT Marel
JBTM
$6.14B
$67.5M 0.2%
465,376
+297,261
+177% +$38.5M
INSM icon
132
Insmed
INSM
$25.9B
$67.2M 0.2%
629,831
-272,835
-30% -$33M
LAUR icon
133
Laureate Education
LAUR
$5.34B
$67M 0.2%
1,843,938
-307,313
-14% -$10.4M
TEX icon
134
Terex
TEX
$7.28B
$66.9M 0.2%
924,613
+70,995
+8% +$4.44M
KWR icon
135
Quaker Houghton
KWR
$2.85B
$66.8M 0.2%
420,535
+32,129
+8% +$4.51M
CGNX icon
136
Cognex
CGNX
$10.2B
$66M 0.2%
910,938
-105,525
-10% -$6.4M
CIEN icon
137
Ciena
CIEN
$53.6B
$65.6M 0.2%
133,801
-264,778
-66% -$135M
MRX
138
Marex Group Limited Ordinary Shares
MRX
$5.24B
$61.5M 0.19%
1,009,199
-556,982
-36% -$30.7M
ESTA icon
139
Establishment Labs
ESTA
$2.11B
$61.3M 0.18%
714,051
+25,124
+4% +$1.8M
SPCX
140
SpaceX
SPCX
$1.87T
$59.7M 0.18%
+349,477
New +$59.4M
SCCO icon
141
Southern Copper
SCCO
$177B
$59.4M 0.18%
344,780
-31,358
-8% -$5.63M
BFAM icon
142
Bright Horizons
BFAM
$3.64B
$58.1M 0.17%
819,598
-183,854
-18% -$13.3M
MOD icon
143
Modine Manufacturing
MOD
$9.43B
$57.1M 0.17%
213,929
-29,414
-12% -$7.75M
TPG icon
144
TPG
TPG
$9B
$56.3M 0.17%
1,388,558
+276,371
+25% +$11.6M
RACE icon
145
Ferrari
RACE
$73.9B
$55.1M 0.17%
148,087
-32,842
-18% -$11.4M
CRCL
146
Circle Internet Group
CRCL
$22.1B
$53.9M 0.16%
+861,252
New +$83.8M
AUB icon
147
Atlantic Union Bankshares
AUB
$5.81B
$53.5M 0.16%
1,265,239
-114,999
-8% -$4.39M
RVLV icon
148
Revolve Group
RVLV
$1.63B
$53.4M 0.16%
2,333,717
+567,294
+32% +$12.6M
PSMT icon
149
Pricesmart
PSMT
$5.23B
$53.2M 0.16%
272,127
+219,136
+414% +$36.5M
BCPC
150
Balchem Corp
BCPC
$5.69B
$53.1M 0.16%
314,063
-1,197
-0.4% -$199K
4 5
6
7 8

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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.