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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
(+10%)
Cap. Flow
-$792M
Cap. Flow
% of AUM
-2.06%
Top 10 Holdings %
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 |
Arista Networks
ANET
|
+$71.2M |
| 3 |
Invesco S&P 500 Equal Weight ETF
RSP
|
+$61.8M |
| 4 |
Vanguard Morningstar Total Stock Market ETF
VTI
|
+$55.8M |
| 5 |
MIAX
Miami International Holdings
MIAX
|
+$49.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
ExxonMobil
XOM
|
+$161M |
| 2 |
Copart
CPRT
|
+$62M |
| 3 |
Danaher
DHR
|
+$59.1M |
| 4 |
Apple
AAPL
|
+$57M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
|
2051
ExxonMobil
XOM
$661B
| – | – |
-946,386
| Closed | -$161M |
|
2052
YPF Sociedad Anonima ADS
YPF
$20.8B
| – | – |
-6,150
| Closed | -$284K |
|
2053
Flutter Entertainment
FLUT
$17.5B
| – | – |
-2,934
| Closed | -$299K |
|
|
SPTB
2054
State Street SPDR Portfolio Treasury ETF
SPTB
$477M
| – | – |
-60
| Closed | -$1.82K |
|
|
INV
2055
Innventure Inc
INV
$93.1M
| – | – |
-55,046
| Closed | -$215K |
|
|
ARES.PRB
2056
Ares Management Corp 6.75% Series B Preferred Stock
ARES.PRB
$1.32B
| – | – |
-500
| Closed | -$18.1K |
|
|
IRD
2057
Opus Genetics
IRD
$361M
| – | – |
-12,466
| Closed | -$56.7K |
|
|
KKR.PRD
2058
KKR & Co 6.25% Series D Preferred Stock
KKR.PRD
$2.42B
| – | – |
-580
| Closed | -$23.3K |
|
|
AII
2059
American Integrity Insurance
AII
$513M
| – | – |
-12,727
| Closed | -$245K |
|
|
STUB
2060
StubHub Holdings
STUB
$2.33B
| – | – |
-19,158
| Closed | -$120K |
|
|
NP
2061
Neptune Insurance Holdings
NP
$4.4B
| – | – |
-10,500
| Closed | -$254K |
|
|
ORCL.PRD
2062
Oracle Corp Preferred Stock Series D
ORCL.PRD
| – | – |
-81
| Closed | -$3.65K |
|
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PIF
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.