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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
ICLR icon
376
Icon
ICLR
$13.1B
$450K ﹤0.01%
2,589
+12
+0.5% +$1.53K
DOC icon
377
Healthpeak Properties
DOC
$14.5B
$444K ﹤0.01%
20,733
+92
+0.4% +$1.72K
JEF icon
378
Jefferies Financial Group
JEF
$12.2B
$443K ﹤0.01%
8,873
+38
+0.4% +$1.96K
CCK icon
379
Crown Holdings
CCK
$12.9B
$431K ﹤0.01%
3,854
+18
+0.5% +$1.82K
TSEM icon
380
Tower Semiconductor
TSEM
$23.5B
$421K ﹤0.01%
1,614
-82,480
-98% -$19.8M
WEX icon
381
WEX
WEX
$6.72B
$415K ﹤0.01%
2,943
+13
+0.4% +$1.93K
BC icon
382
Brunswick
BC
$4.97B
$412K ﹤0.01%
4,888
+23
+0.5% +$1.84K
COLB icon
383
Columbia Banking Systems
COLB
$8.51B
$402K ﹤0.01%
12,529
– –
HPE icon
384
Hewlett Packard
HPE
$69.3B
$374K ﹤0.01%
+8,300
New +$300K
SSB icon
385
SouthState Bank Corp
SSB
$10.3B
$374K ﹤0.01%
3,742
– –
LH icon
386
Labcorp
LH
$27.2B
$369K ﹤0.01%
1,317
+6
+0.5% +$1.58K
RGLD icon
387
Royal Gold
RGLD
$22.3B
$360K ﹤0.01%
1,803
+9
+0.5% +$2.09K
CACI icon
388
CACI
CACI
$13.9B
$348K ﹤0.01%
752
+4
+0.5% +$2.04K
CPT icon
389
Camden Property Trust
CPT
$12.3B
$304K ﹤0.01%
2,659
+12
+0.5% +$1.28K
TAP icon
390
Molson Coors Class B
TAP
$7.73B
$297K ﹤0.01%
7,634
+34
+0.4% +$1.42K
EXE
391
Expand Energy Corp
EXE
$22.7B
$289K ﹤0.01%
3,168
+14
+0.4% +$1.33K
TECH icon
392
Bio-Techne
TECH
$11.3B
$287K ﹤0.01%
4,060
-2,458,427
-100% -$133M
STAG icon
393
STAG Industrial
STAG
$7.17B
$273K ﹤0.01%
7,176
– –
TOL icon
394
Toll Brothers
TOL
$13.5B
$269K ﹤0.01%
1,635
+18
+1% +$2.56K
ETR icon
395
Entergy
ETR
$49.3B
$269K ﹤0.01%
2,342
+26
+1% +$2.93K
PR
396
Permian Resources
PR
$19B
$265K ﹤0.01%
14,401
+55
+0.4% +$1.1K
AFG icon
397
American Financial Group
AFG
$11.9B
$236K ﹤0.01%
1,683
– –
STT icon
398
State Street
STT
$53.1B
$234K ﹤0.01%
1,379
-447
-24% -$68.9K
INGR icon
399
Ingredion
INGR
$6.6B
$232K ﹤0.01%
2,453
+11
+0.5% +$1.16K
PSX icon
400
Phillips 66
PSX
$97.4B
$217K ﹤0.01%
1,285
+15
+1% +$2.58K
14 15
16
17 18

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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.