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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
LECO icon
76
Lincoln Electric
LECO
$15.5B
$135M 0.4%
506,862
-27,989
-5% -$7.32M
EXP icon
77
Eagle Materials
EXP
$6.06B
$130M 0.39%
576,712
-53,680
-9% -$11.2M
CLH icon
78
Clean Harbors
CLH
$16.4B
$125M 0.38%
419,210
-23,888
-5% -$7.06M
NOVT icon
79
Novanta
NOVT
$5.38B
$124M 0.37%
765,867
-17,217
-2% -$2.49M
BIRK icon
80
Birkenstock
BIRK
$5.89B
$123M 0.37%
2,865,895
+290,493
+11% +$11.7M
FHN icon
81
First Horizon
FHN
$11.7B
$123M 0.37%
4,808,223
-249,869
-5% -$6.09M
ETSY icon
82
Etsy
ETSY
$7.67B
$120M 0.36%
+1,598,520
New +$103M
TIGO icon
83
Millicom
TIGO
$15.7B
$119M 0.36%
1,309,545
-96,063
-7% -$8.09M
DBD icon
84
Diebold Nixdorf
DBD
$2.29B
$117M 0.35%
1,379,553
-46,911
-3% -$3.77M
GTX icon
85
Garrett Motion
GTX
$4.97B
$117M 0.35%
3,232,883
-2,529,814
-44% -$70.4M
EHC icon
86
Encompass Health
EHC
$11.9B
$116M 0.35%
1,151,085
+347,934
+43% +$36M
APPF icon
87
AppFolio
APPF
$8.3B
$116M 0.35%
721,826
+78,595
+12% +$12.5M
MAR icon
88
Marriott International
MAR
$91.5B
$112M 0.34%
300,872
+216,241
+256% +$79.7M
NBHC icon
89
National Bank Holdings
NBHC
$1.84B
$111M 0.33%
2,497,817
+22,956
+0.9% +$970K
CMG icon
90
Chipotle Mexican Grill
CMG
$48.1B
$110M 0.33%
3,235,762
-674,911
-17% -$22M
SAIA icon
91
Saia
SAIA
$9.37B
$109M 0.33%
259,020
+88,875
+52% +$39.1M
RGEN icon
92
Repligen
RGEN
$9.95B
$108M 0.32%
+788,571
New +$96.9M
FRPT icon
93
Freshpet
FRPT
$3.4B
$107M 0.32%
1,810,994
-2,191
-0.1% -$125K
JAZZ icon
94
Jazz Pharmaceuticals
JAZZ
$15.9B
$105M 0.32%
436,893
+366,010
+516% +$80.2M
MLM icon
95
Martin Marietta Materials
MLM
$37.7B
$105M 0.32%
181,902
-90,490
-33% -$53.7M
KNX icon
96
Knight Transportation
KNX
$10.9B
$104M 0.31%
1,330,047
+386,761
+41% +$26.8M
WFRD icon
97
Weatherford International
WFRD
$6.72B
$103M 0.31%
1,260,878
+680,947
+117% +$69.1M
GMED icon
98
Globus Medical
GMED
$11.1B
$102M 0.31%
1,284,896
-724,867
-36% -$61.6M
NU icon
99
Nu Holdings
NU
$69.1B
$101M 0.31%
7,596,051
-4,671,549
-38% -$63M
HBM icon
100
Hudbay
HBM
$13B
$99.5M 0.3%
+4,215,842
New +$107M
2 3
4
5 6

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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.