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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
BWIN
51
Baldwin Insurance Group
BWIN
$2.97B
$179M 0.54%
6,732,965
-61,527
-0.9% -$1.33M
BSY icon
52
Bentley Systems
BSY
$11.3B
$178M 0.53%
5,942,507
+2,619,784
+79% +$85.2M
LSCC icon
53
Lattice Semiconductor
LSCC
$16.2B
$177M 0.53%
1,160,417
-883,303
-43% -$114M
MDGL icon
54
Madrigal Pharmaceuticals
MDGL
$12.3B
$174M 0.52%
324,123
-16,396
-5% -$8.4M
EG icon
55
Everest Group
EG
$14.5B
$171M 0.52%
479,877
-26,289
-5% -$9M
A icon
56
Agilent Technologies
A
$43.4B
$171M 0.51%
1,287,265
-508,499
-28% -$62M
ORLY icon
57
O'Reilly Automotive
ORLY
$71.6B
$171M 0.51%
1,855,002
-355,032
-16% -$32.4M
DT icon
58
Dynatrace
DT
$15.5B
$169M 0.51%
3,857,741
+628,690
+19% +$24.5M
MIRM icon
59
Mirum Pharmaceuticals
MIRM
$5.94B
$164M 0.49%
1,404,741
+1,069,072
+318% +$107M
HQY icon
60
HealthEquity
HQY
$7.97B
$160M 0.48%
1,773,227
+113,611
+7% +$9.63M
IDXX icon
61
Idexx Laboratories
IDXX
$43.7B
$157M 0.47%
298,154
-53,467
-15% -$30M
NOW icon
62
ServiceNow
NOW
$150B
$154M 0.46%
1,551,192
-820,422
-35% -$81.2M
SYNA icon
63
Synaptics
SYNA
$3.72B
$154M 0.46%
1,239,622
-346,622
-22% -$39.1M
TXN icon
64
Texas Instruments
TXN
$236B
$151M 0.45%
506,229
+82,034
+19% +$22.8M
SN icon
65
SharkNinja
SN
$26.9B
$150M 0.45%
986,806
-86,578
-8% -$10.4M
WST icon
66
West Pharmaceutical
WST
$23.7B
$150M 0.45%
417,309
+377,584
+950% +$115M
LOPE icon
67
Grand Canyon Education
LOPE
$3.94B
$149M 0.45%
1,038,828
+59,094
+6% +$9.38M
LFUS icon
68
Littelfuse
LFUS
$10.3B
$146M 0.44%
321,681
+17,106
+6% +$7.41M
CNQ icon
69
Canadian Natural Resources
CNQ
$101B
$144M 0.43%
+3,635,082
New +$165M
RS icon
70
Reliance Steel & Aluminium
RS
$19.8B
$143M 0.43%
382,494
-20,993
-5% -$7.68M
TTE icon
71
TotalEnergies
TTE
$191B
$141M 0.43%
1,819,275
+965,524
+113% +$85.4M
FPS
72
Forgent Power Solutions
FPS
$7.9B
$141M 0.42%
+2,516,270
New +$115M
PTCT icon
73
PTC Therapeutics
PTCT
$5.85B
$141M 0.42%
+1,722,688
New +$124M
TKR icon
74
Timken Company
TKR
$8.37B
$139M 0.42%
954,839
+949,663
+18,347% +$114M
CYTK icon
75
Cytokinetics
CYTK
$10B
$137M 0.41%
1,603,442
+515,851
+47% +$37M
1 2
3
4 5

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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.