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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
CORP icon
1676
PIMCO Investment Grade Corporate Bond Index Exchange-Traded Fund
CORP
$1.33B
$105K ﹤0.01%
1,086
+687
+172% +$66.5K
AVAH icon
1677
Aveanna Healthcare
AVAH
$3.14B
$105K ﹤0.01%
+12,205
New +$86K
KBWB icon
1678
Invesco KBW Bank ETF
KBWB
$6.77B
$105K ﹤0.01%
1,125
+868
+338% +$75.9K
RSPG icon
1679
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$634M
$103K ﹤0.01%
1,056
+1
+0.1% +$104
FBT icon
1680
First Trust NYSE Arca Biotechnology Index Fund
FBT
$2.88B
$102K ﹤0.01%
413
+138
+50% +$29.7K
SVV icon
1681
Savers
SVV
$1.51B
$102K ﹤0.01%
10,118
+83
+0.8% +$720
PID icon
1682
Invesco International Dividend Achievers ETF
PID
$897M
$101K ﹤0.01%
4,560
– –
IXG icon
1683
iShares Global Financials ETF
IXG
$696M
$101K ﹤0.01%
812
+324
+66% +$39.4K
BFLY icon
1684
Butterfly Network
BFLY
$1.97B
$99.7K ﹤0.01%
11,843
-67,657
-85% -$350K
SANA icon
1685
Sana Biotechnology
SANA
$958M
$98.6K ﹤0.01%
28,263
+835
+3% +$2.69K
PFFD icon
1686
Global X US Preferred ETF
PFFD
$2.1B
$98.1K ﹤0.01%
5,250
– –
IAT icon
1687
iShares US Regional Banks ETF
IAT
$653M
$97.5K ﹤0.01%
1,567
– –
JMIA
1688
Jumia Technologies
JMIA
$981M
$95.2K ﹤0.01%
13,500
– –
PIO icon
1689
Invesco Global Water ETF
PIO
$263M
$95K ﹤0.01%
2,113
– –
GMF icon
1690
State Street SPDR S&P Emerging Asia Pacific ETF
GMF
$426M
$93.7K ﹤0.01%
597
– –
ALT icon
1691
Altimmune
ALT
$642M
$93.2K ﹤0.01%
30,660
+2,437
+9% +$7.28K
RSPF icon
1692
Invesco S&P 500 Equal Weight Financials ETF
RSPF
$307M
$93.1K ﹤0.01%
1,200
-1,000
-45% -$75.6K
RWR icon
1693
State Street SPDR Dow Jones REIT ETF
RWR
$1.82B
$93K ﹤0.01%
823
-50
-6% -$5.48K
PZA icon
1694
Invesco National AMT-Free Municipal Bond ETF
PZA
$4.15B
$92.2K ﹤0.01%
3,920
+922
+31% +$21.5K
FLRN icon
1695
State Street SPDR Bloomberg Investment Grade Floating Rate ETF
FLRN
$2.95B
$91.9K ﹤0.01%
2,978
-50
-2% -$1.54K
DEM icon
1696
WisdomTree Emerging Markets High Dividend Fund
DEM
$4.22B
$91.8K ﹤0.01%
1,706
-193
-10% -$10.3K
IZRL icon
1697
ARK Israel Innovative Technology ETF
IZRL
$135M
$90.8K ﹤0.01%
2,990
– –
EWX icon
1698
State Street SPDR S&P Emerging Markets Small Cap ETF
EWX
$667M
$90.3K ﹤0.01%
1,215
– –
GEF.B icon
1699
Greif Class B
GEF.B
$3.99B
$90.3K ﹤0.01%
965
+49
+5% +$4.14K
INN
1700
Summit Hotel Properties
INN
$603M
$89.9K ﹤0.01%
+12,828
New +$70.8K
66 67
68
69 70

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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.