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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
CW icon
26
Curtiss-Wright
CW
$22B
$240M 0.72%
317,306
+85,237
+37% +$62.5M
ITUB icon
27
Itaú Unibanco
ITUB
$82.7B
$231M 0.69%
28,283,482
-3,401,226
-11% -$28.2M
SNOW icon
28
Snowflake
SNOW
$114B
$229M 0.69%
901,087
-226,438
-20% -$41.7M
TWST icon
29
Twist Bioscience
TWST
$8.87B
$224M 0.67%
2,174,594
-3,095,124
-59% -$201M
TEVA icon
30
Teva Pharmaceuticals
TEVA
$42.5B
$223M 0.67%
6,593,221
+5,167,554
+362% +$172M
UNH icon
31
UnitedHealth
UNH
$353B
$218M 0.65%
523,387
-149,876
-22% -$55.6M
CRWD icon
32
CrowdStrike
CRWD
$224B
$215M 0.65%
+1,125,636
New +$160M
RRX icon
33
Regal Rexnord
RRX
$10.5B
$212M 0.64%
891,139
+53,646
+6% +$11.2M
KRYS icon
34
Krystal Biotech
KRYS
$10.4B
$212M 0.64%
570,153
+162,975
+40% +$48.7M
CRS icon
35
Carpenter Technology
CRS
$23.6B
$205M 0.62%
332,607
-18,289
-5% -$8.61M
POWI icon
36
Power Integrations
POWI
$2.88B
$200M 0.6%
2,382,007
+1,330
+0.1% +$96K
NVT icon
37
nVent Electric
NVT
$24B
$198M 0.6%
1,167,763
-66,111
-5% -$10.3M
GH icon
38
Guardant Health
GH
$21.7B
$197M 0.59%
1,311,320
+360,206
+38% +$39.2M
HALO icon
39
Halozyme
HALO
$12B
$197M 0.59%
2,511,050
-14,925
-0.6% -$1.02M
TLN
40
Talen Energy Corp
TLN
$14.2B
$191M 0.58%
497,660
-27,554
-5% -$10.1M
TRU icon
41
TransUnion
TRU
$16.4B
$191M 0.57%
2,648,744
-242,443
-8% -$17M
CCJ icon
42
Cameco
CCJ
$43.6B
$189M 0.57%
1,858,735
+176,432
+10% +$19.8M
STRL icon
43
Sterling Infrastructure
STRL
$14.4B
$188M 0.56%
223,697
-99,724
-31% -$70M
COST icon
44
Costco
COST
$419B
$186M 0.56%
199,355
-103,113
-34% -$103M
ALHC icon
45
Alignment Healthcare
ALHC
$2.83B
$185M 0.56%
7,761,403
+2,546,789
+49% +$48.9M
CHRW icon
46
C.H. Robinson
CHRW
$17.6B
$184M 0.55%
978,297
-63,361
-6% -$11.3M
STX icon
47
Seagate
STX
$188B
$184M 0.55%
+190,847
New +$146M
DIOD icon
48
Diodes
DIOD
$4.05B
$184M 0.55%
1,682,686
+1,241,124
+281% +$126M
BWXT icon
49
BWX Technologies
BWXT
$14B
$183M 0.55%
941,233
-40,549
-4% -$8.45M
AKAM icon
50
Akamai
AKAM
$15.4B
$182M 0.55%
1,535,467
-83,593
-5% -$10.4M
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.