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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
TSM icon
1
TSMC
TSM
$2.17T
$2.36B 7.09%
4,936,408
-581,852
-11% -$236M
NVDA icon
2
NVIDIA
NVDA
$5.25T
$1.72B 5.17%
8,599,021
-342,735
-4% -$70.5M
GOOGL icon
3
Alphabet (Google) Class A
GOOGL
$4.24T
$1.14B 3.43%
3,191,012
+686,407
+27% +$247M
AAPL icon
4
Apple
AAPL
$4.67T
$943M 2.84%
3,259,914
-1,552,519
-32% -$444M
AVGO icon
5
Broadcom
AVGO
$1.75T
$777M 2.34%
2,056,135
-145,423
-7% -$58.3M
MSFT icon
6
Microsoft
MSFT
$3.81T
$764M 2.3%
2,048,642
-848,140
-29% -$343M
META icon
7
Meta Platforms (Facebook)
META
$1.47T
$535M 1.61%
950,115
-63,007
-6% -$38.5M
AMZN icon
8
Amazon
AMZN
$2.87T
$474M 1.42%
1,987,085
-1,176,544
-37% -$295M
MA icon
9
Mastercard
MA
$521B
$471M 1.42%
918,005
-142,646
-13% -$71.1M
AMD icon
10
Advanced Micro Devices
AMD
$760B
$444M 1.33%
763,517
-279,077
-27% -$114M
AMAT icon
11
Applied Materials
AMAT
$366B
$360M 1.08%
497,946
+463,006
+1,325% +$214M
GE icon
12
GE Aerospace
GE
$355B
$296M 0.89%
+790,801
New +$248M
AZN icon
13
AstraZeneca
AZN
$252B
$283M 0.85%
1,514,795
-427,360
-22% -$80.4M
PRMB
14
Primo Brands
PRMB
$8.32B
$279M 0.84%
11,426,823
-1,629,369
-12% -$36.2M
P
15
Everpure Inc
P
$31B
$272M 0.82%
3,455,381
+573,900
+20% +$42.1M
APH icon
16
Amphenol
APH
$194B
$271M 0.81%
1,535,059
+457,625
+42% +$66M
LIN icon
17
Linde
LIN
$226B
$262M 0.79%
504,953
-131,385
-21% -$66.5M
ONTO icon
18
Onto Innovation
ONTO
$16.6B
$252M 0.76%
665,377
-298,836
-31% -$84.6M
BWA icon
19
BorgWarner
BWA
$13.1B
$251M 0.76%
3,784,707
+900,645
+31% +$57M
CG icon
20
Carlyle Group
CG
$17.5B
$249M 0.75%
5,914,905
-386,204
-6% -$18.1M
ARGX icon
21
argenx
ARGX
$64B
$245M 0.74%
264,617
-1,450
-0.5% -$1.2M
MLI icon
22
Mueller Industries
MLI
$13.9B
$244M 0.73%
3,972,278
-247,180
-6% -$16.2M
MNST icon
23
Monster Beverage
MNST
$91.8B
$244M 0.73%
5,076,272
-794,222
-14% -$33.4M
FFIV icon
24
F5
FFIV
$22.3B
$244M 0.73%
586,271
-63,677
-10% -$22.6M
BAP icon
25
Credicorp
BAP
$29.3B
$244M 0.73%
625,144
+2,454
+0.4% +$839K
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.