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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
EPU icon
1951
iShares MSCI Peru and Global Exposure ETF
EPU
$546M
$2.34K ﹤0.01%
28
– –
USDU icon
1952
WisdomTree Bloomberg US Dollar Bullish Fund
USDU
$276M
$2.27K ﹤0.01%
85
– –
IHF icon
1953
iShares US Healthcare Providers ETF
IHF
$1.33B
$2.21K ﹤0.01%
40
-560
-93% -$27.7K
XSLV icon
1954
Invesco S&P SmallCap Low Volatility ETF
XSLV
$249M
$2.2K ﹤0.01%
42
– –
GTOP
1955
Goldman Sachs Technology Opportunities ETF
GTOP
$715M
$2.19K ﹤0.01%
45
– –
MILN
1956
Global X Millennial Consumer ETF
MILN
$92.7M
$2.17K ﹤0.01%
50
– –
PGF icon
1957
Invesco Financial Preferred ETF
PGF
$639M
$2.06K ﹤0.01%
150
– –
VXX icon
1958
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$132M
$1.5K ﹤0.01%
68
-750
-92% -$20.4K
FDLO icon
1959
Fidelity Low Volatility Factor ETF
FDLO
$1.42B
$1.24K ﹤0.01%
18
– –
SMRI icon
1960
Bushido Capital US Equity ETF
SMRI
$716M
$1.23K ﹤0.01%
30
– –
PGJ icon
1961
Invesco Golden Dragon China ETF
PGJ
$84.9M
$1.13K ﹤0.01%
50
-10
-17% -$257
OPFI icon
1962
OppFi
OPFI
$663M
$1K ﹤0.01%
101
+65
+181% +$562
MCHI icon
1963
iShares MSCI China ETF
MCHI
$6.14B
$910 ﹤0.01%
18
– –
VCLT icon
1964
Vanguard Long-Term Corporate Bond ETF
VCLT
$8.79B
$903 ﹤0.01%
12
– –
OPENW
1965
Opendoor Technologies Inc Series K Warrants
OPENW
$5.19M
$841 ﹤0.01%
1,699
+33
+2% +$20
SEATW icon
1966
Vivid Seats Inc Warrant
SEATW
$381K
$816 ﹤0.01%
20,000
– –
GDE icon
1967
WisdomTree Efficient Gold Plus Equity Strategy Fund
GDE
$468M
$611 ﹤0.01%
10
– –
EBND icon
1968
State Street SPDR Bloomberg Emerging Markets Local Bond ETF
EBND
$2.27B
$607 ﹤0.01%
+29
New +$608
SPXS icon
1969
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$369M
$530 ﹤0.01%
+20
New +$590
CORZZ icon
1970
Core Scientific Inc Tranche 2 Warrants
CORZZ
$1.4B
$523 ﹤0.01%
21
-100
-83% -$2.35K
OPENL
1971
Opendoor Technologies Inc Series A Warrants
OPENL
$3.23M
$480 ﹤0.01%
1,699
+33
+2% +$10
WGO icon
1972
Winnebago Industries
WGO
$802M
$437 ﹤0.01%
14
-63
-82% -$1.92K
OPENZ
1973
Opendoor Technologies Inc Series Z Warrants
OPENZ
$3.17M
$408 ﹤0.01%
1,699
+33
+2% +$9
SILJ icon
1974
Amplify Junior Silver Miners ETF
SILJ
$3.85B
$394 ﹤0.01%
15
-2,635
-99% -$78.1K
OPFI.WS
1975
DELISTED
OppFi Inc Warrants
OPFI.WS
$315 ﹤0.01%
10,500
– –
77 78
79
80 81

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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.