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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
FTA icon
1701
First Trust Large Cap Value AlphaDEX Fund
FTA
$1.41B
$89.8K ﹤0.01%
928
– –
PXH icon
1702
Invesco FTSE RAFI Emerging Markets ETF
PXH
$2.09B
$89.8K ﹤0.01%
3,222
-242
-7% -$6.91K
USHY icon
1703
iShares Broad USD High Yield Corporate Bond ETF
USHY
$28.3B
$89K ﹤0.01%
2,403
+89
+4% +$3.29K
MTH icon
1704
Meritage Homes
MTH
$4.23B
$88.9K ﹤0.01%
1,060
-2,010
-65% -$137K
GSY icon
1705
Invesco Ultra Short Duration ETF
GSY
$3.93B
$85.8K ﹤0.01%
1,711
+1
+0.1% +$50
EWL icon
1706
iShares MSCI Switzerland ETF
EWL
$2.32B
$84.4K ﹤0.01%
1,343
+1,098
+448% +$67.6K
SMIN icon
1707
iShares MSCI India Small-Cap ETF
SMIN
$762M
$84K ﹤0.01%
1,188
+89
+8% +$5.93K
WU icon
1708
Western Union
WU
$2.19B
$83.6K ﹤0.01%
10,853
-7,773
-42% -$65.2K
PFFA icon
1709
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.48B
$82.3K ﹤0.01%
4,000
– –
IDU icon
1710
iShares US Utilities ETF
IDU
$1.27B
$78.3K ﹤0.01%
683
+140
+26% +$16K
IEO icon
1711
iShares US Oil & Gas Exploration & Production ETF
IEO
$725M
$78.2K ﹤0.01%
712
– –
OVID icon
1712
Ovid Therapeutics
OVID
$535M
$77.6K ﹤0.01%
28,839
– –
ANGL icon
1713
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.17B
$77.3K ﹤0.01%
2,644
+2,323
+724% +$67.6K
EDIV icon
1714
State Street SPDR S&P Emerging Markets Dividend ETF
EDIV
$1.22B
$77.3K ﹤0.01%
1,887
+3
+0.2% +$123
PSEC icon
1715
Prospect Capital
PSEC
$1.13B
$77.2K ﹤0.01%
33,400
-12,500
-27% -$30.8K
GDYN icon
1716
Grid Dynamics Holdings
GDYN
$668M
$77K ﹤0.01%
13,560
-485,795
-97% -$3.01M
QS icon
1717
QuantumScape Corp
QS
$3.2B
$76.7K ﹤0.01%
10,148
-9,908
-49% -$74.3K
OIH icon
1718
VanEck Oil Services ETF
OIH
$1.97B
$76.3K ﹤0.01%
205
+2
+1% +$838
SMLF icon
1719
iShares US Small Cap Equity Factor ETF
SMLF
$4.15B
$75.3K ﹤0.01%
844
+2
+0.2% +$167
RXRX icon
1720
Recursion Pharmaceuticals
RXRX
$1.83B
$74K ﹤0.01%
20,169
-9,892
-33% -$32.9K
IMTB icon
1721
iShares Core 5-10 Year USD Bond ETF
IMTB
$269M
$73.9K ﹤0.01%
1,694
-52
-3% -$2.27K
RMCO icon
1722
Royalty Management
RMCO
$38.8M
$73.3K ﹤0.01%
27,982
+4,200
+18% +$11.1K
XSVM icon
1723
Invesco S&P SmallCap Value with Momentum ETF
XSVM
$637M
$73.3K ﹤0.01%
+1,053
New +$69.5K
AREC icon
1724
American Resources Corp
AREC
$218M
$72.4K ﹤0.01%
33,675
-4,600
-12% -$10.3K
SRLN icon
1725
State Street Blackstone Senior Loan ETF
SRLN
$5.59B
$71.4K ﹤0.01%
1,771
-16
-0.9% -$646
67 68
69
70 71

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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.