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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
51
PUT
Netflix
NFLX
$263B
| $428M | 0.23% |
6,148,600
-494,000
| -7% | -$37.1M |
2014 Q4
47 quarters
|
|
52
PUT
State Street SPDR NYSE Technology ETF
XNTK
$1.74B
| $413M | 0.22% |
4,447,700
+1,215,300
| +38% | +$436M |
2014 Q4
47 quarters
|
|
53
PUT
iShares Morningstar Value ETF
ILCV
$1.4B
| $397M | 0.22% |
5,048,400
+2,713,800
| +116% | +$288M |
2014 Q4
47 quarters
|
|
|
54
CALL
Netflix
NFLX
$263B
| $376M | 0.2% |
5,410,600
-2,014,900
| -27% | -$151M |
2014 Q4
47 quarters
|
|
55
CALL
UnitedHealth
UNH
$356B
| $375M | 0.2% |
1,021,900
-201,200
| -16% | -$81M |
2021 Q2
21 quarters
|
|
56
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$4.16B
| $369M | 0.2% |
2,592,600
+970,800
| +60% | +$195M |
2014 Q4
47 quarters
|
|
57
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $356M | 0.19% |
700,300
+229,900
| +49% | +$121M |
2015 Q1
46 quarters
|
|
|
UWC
58
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $353M | 0.19% |
4,377,900
+2,279,100
| +109% | +$184M |
2014 Q4
47 quarters
|
|
59
PUT
Marvell Technology
MRVL
$139B
| $335M | 0.18% |
1,269,400
-56,900
| -4% | -$12.8M |
2021 Q2
21 quarters
|
|
60
CALL
CrowdStrike
CRWD
$234B
| $322M | 0.18% |
1,216,800
-119,200
| -9% | -$25.3M |
2019 Q2
29 quarters
|
|
|
61
PUT
United States Oil Fund
USO
$1.82B
| $314M | 0.17% |
2,154,900
-44,300
| -2% | -$5.85M |
2021 Q2
21 quarters
|
|
|
62
CALL
Marvell Technology
MRVL
$139B
| $308M | 0.17% |
1,166,400
+375,400
| +47% | +$84.2M |
2021 Q2
21 quarters
|
|
|
UWC
63
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $294M | 0.16% |
3,651,100
+1,414,600
| +63% | +$114M |
2014 Q4
47 quarters
|
|
64
PUT
iShares MSCI Australia ETF
EWA
$1.26B
| $276M | 0.15% |
3,511,200
+880,600
| +33% | +$25.7M |
2014 Q4
47 quarters
|
|
|
65
PUT
UnitedHealth
UNH
$356B
| $260M | 0.14% |
709,200
-267,000
| -27% | -$107M |
2021 Q2
21 quarters
|
|
66
CALL
Alibaba
BABA
$262B
| $260M | 0.14% |
2,416,500
+203,800
| +9% | +$23.6M |
2021 Q2
21 quarters
|
|
|
67
NVIDIA
NVDA
$4.31T
| $243M | 0.13% |
1,064,484
-456,208
| -30% | -$97.8M |
2023 Q2
13 quarters
|
|
68
CALL
Goldman Sachs
GS
$261B
| $243M | 0.13% |
269,700
+28,800
| +12% | +$29.5M |
2014 Q4
47 quarters
|
|
|
69
PUT
Goldman Sachs
GS
$261B
| $241M | 0.13% |
268,100
+46,800
| +21% | +$47.9M |
2014 Q4
47 quarters
|
|
70
PUT
Bloom Energy
BE
$57.3B
| $236M | 0.13% |
850,300
+168,700
| +25% | +$39.9M |
2018 Q3
32 quarters
|
|
|
71
PUT
Alibaba
BABA
$262B
| $235M | 0.13% |
2,186,600
+74,200
| +4% | +$8.58M |
2021 Q2
21 quarters
|
|
72
PUT
Nebius Group N.V.
NBIS
$38.5B
| $233M | 0.13% |
987,000
-242,800
| -20% | -$52.2M |
2024 Q4
7 quarters
|
|
|
73
iShares 20+ Year Treasury Bond ETF
TLT
$49.1B
| $232M | 0.13% |
2,984,270
+1,123,273
| +60% | +$92.6M |
2026 Q1
2 quarters
|
|
74
PUT
Dell
DELL
$220B
| $226M | 0.12% |
420,200
-23,500
| -5% | -$11M |
2016 Q3
40 quarters
|
|
|
75
CALL
United States Oil Fund
USO
$1.82B
| $223M | 0.12% |
1,527,800
-346,400
| -18% | -$45.7M |
2021 Q2
21 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.