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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+19.08%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
AUM
$38.4B
AUM Growth
+$3.49B
Cap. Flow
-$792M
Cap. Flow %
-2.06%
Top 10 Hldgs %
26.32%
Holding
2,083
New
163
Increased
891
Reduced
708
Closed
85

Top Buys

Rank Stock Value
1
HONA
Honeywell Aerospace
HONA
+$100M
2
ANET icon
Arista Networks
ANET
+$71.2M
3
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$61.8M
4
VTI icon
Vanguard Morningstar Total Stock Market ETF
VTI
+$55.8M
5
MIAX
Miami International Holdings
MIAX
+$49.4M

Top Sells

Rank Stock Value
1
XOM icon
ExxonMobil
XOM
+$161M
2
CPRT icon
Copart
CPRT
+$62M
3
DHR icon
Danaher
DHR
+$59.1M
4
AAPL icon
Apple
AAPL
+$57M
5
VEEV icon
Veeva Systems
VEEV
+$52.2M

Sector Composition

Rank Sector Weight
1 Technology 24.38%
2 Miscellaneous 18.67%
3 Industrials 15.24%
4 Financials 11.07%
5 Healthcare 9.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MOS icon
1001
The Mosaic Company
MOS
$8.09B
$938K ﹤0.01%
44,259
+12,700
+40% +$294K
BOND icon
1002
PIMCO Active Bond Exchange-Traded Fund
BOND
$8.53B
$937K ﹤0.01%
10,167
+9,066
+823% +$835K
BDSX icon
1003
Biodesix
BDSX
$292M
$937K ﹤0.01%
41,548
+13,965
+51% +$207K
QYLD icon
1004
Global X NASDAQ-100 Covered Call ETF
QYLD
$8.31B
$933K ﹤0.01%
50,629
-8
-0% -$143
IYM icon
1005
iShares US Basic Materials ETF
IYM
$1.18B
$932K ﹤0.01%
5,192
+766
+17% +$140K
BNDX icon
1006
Vanguard Total International Bond ETF
BNDX
$82.3B
$929K ﹤0.01%
19,191
+7,932
+70% +$382K
ERIE icon
1007
Erie Indemnity
ERIE
$13.1B
$924K ﹤0.01%
3,853
-380
-9% -$87.1K
MUFG icon
1008
Mitsubishi UFJ Financial
MUFG
$267B
$922K ﹤0.01%
46,380
+2,868
+7% +$54K
GWX icon
1009
State Street SPDR S&P International Small Cap ETF
GWX
$924M
$920K ﹤0.01%
21,028
– –
IHG icon
1010
InterContinental Hotels
IHG
$22.5B
$917K ﹤0.01%
5,295
+798
+18% +$122K
CLX icon
1011
Clorox
CLX
$10.5B
$914K ﹤0.01%
9,573
-5,733
-37% -$550K
VSS icon
1012
Vanguard FTSE All-World ex-US Small-Cap Index Fund
VSS
$11.7B
$912K ﹤0.01%
5,910
-126
-2% -$19.8K
CLBT icon
1013
Cellebrite
CLBT
$2.83B
$906K ﹤0.01%
62,034
-55,611
-47% -$735K
VONG icon
1014
Vanguard Russell 1000 Growth ETF
VONG
$45.1B
$905K ﹤0.01%
7,078
-5,627
-44% -$698K
TEVA icon
1015
Teva Pharmaceuticals
TEVA
$45.7B
$902K ﹤0.01%
26,635
+12,531
+89% +$417K
VMRK
1016
Vivmark Residential
VMRK
$50.8B
$901K ﹤0.01%
13,269
-5,621
-30% -$364K
WAL icon
1017
Western Alliance Bancorporation
WAL
$8.62B
$901K ﹤0.01%
10,956
-17,863
-62% -$1.41M
AER icon
1018
AerCap
AER
$21.7B
$898K ﹤0.01%
6,159
-186
-3% -$26.4K
IONQ icon
1019
IonQ
IONQ
$15B
$897K ﹤0.01%
16,839
+4,322
+35% +$219K
L icon
1020
Loews
L
$22.3B
$896K ﹤0.01%
7,915
+284
+4% +$30.8K
SGOV icon
1021
iShares 0-3 Month Treasury Bond ETF
SGOV
$109B
$894K ﹤0.01%
8,882
-94,968
-91% -$9.55M
RMBS icon
1022
Rambus
RMBS
$9.01B
$894K ﹤0.01%
6,734
+1,774
+36% +$231K
KRYS icon
1023
Krystal Biotech
KRYS
$9.97B
$891K ﹤0.01%
2,397
-51
-2% -$15.2K
EXE
1024
Expand Energy Corp
EXE
$21.8B
$886K ﹤0.01%
9,714
-709
-7% -$67.3K
PSA icon
1025
Public Storage
PSA
$55.4B
$884K ﹤0.01%
2,778
+232
+9% +$71K
39 40
41
42 43

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William Blair & Company's Q2 2026 Portfolio in Review

As of Q2 2026, William Blair & Company held 2,083 positions worth $38.4B, up 10% from $34.9B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q2 2026 filing shows 163 new, 891 increased, 708 reduced and 85 closed positions. Its largest new stake was Honeywell Aerospace: 454,071 shares worth $100M. The largest sale was ExxonMobil, an estimated $161M.

By sector, the portfolio is most concentrated in Technology at 24% of assets, up from 22% a quarter earlier, followed by Miscellaneous and Industrials.

  • William Blair & Company's largest Q2 2026 buy was Honeywell Aerospace: 454,071 shares worth $100M.
  • William Blair & Company added most to Arista Networks in Q2 2026, an estimated $71.2M increase.
  • William Blair & Company's biggest Q2 2026 reduction was Copart, cutting an estimated $62M.
  • William Blair & Company fully exited ExxonMobil in Q2 2026, selling an estimated $161M.
  • William Blair & Company's ten largest holdings make up 26% of its $38.4B portfolio in Q2 2026.
  • William Blair & Company opened 163 new positions and closed 85 in Q2 2026.
  • William Blair & Company's portfolio value rose 10% quarter-over-quarter to $38.4B.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.