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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 | |
|---|---|---|---|---|---|---|---|
4051
CALL
Leonardo DRS
DRS
$9.36B
| $330K | ﹤0.01% |
9,000
+5,600
| +165% | +$234K |
2022 Q4
15 quarters
|
|
4052
CALL
Aptera Motors
SEV
$63.2M
| $329K | ﹤0.01% |
158,400
+22,500
| +17% | +$46.8K |
2025 Q4
3 quarters
|
|
4053
CALL
BeOne Medicines Ltd
ONC
$47.3B
| $329K | ﹤0.01% |
+900
| New | +$308K |
2026 Q3
0 quarters
|
|
4054
CALL
Verra Mobility
VRRM
$278M
| $329K | ﹤0.01% |
106,200
+73,400
| +224% | +$310K |
2025 Q1
6 quarters
|
|
4055
BBVA Argentina
BBAR
$2.13B
| $329K | ﹤0.01% |
+25,616
| New | +$426K |
2026 Q3
0 quarters
|
|
4056
PUT
DTE Energy
DTE
$29.2B
| $329K | ﹤0.01% |
2,700
-2,100
| -44% | -$292K |
2017 Q3
36 quarters
|
|
4057
CALL
Kura Oncology
KURA
$690M
| $329K | ﹤0.01% |
30,700
-18,800
| -38% | -$210K |
2023 Q3
12 quarters
|
|
4058
Sharplink Inc
SBET
$1.21B
| $328K | ﹤0.01% |
35,386
-220,767
| -86% | -$1.61M |
2025 Q2
5 quarters
|
|
4059
PUT
DELISTED
Bowman Consulting
BWMN
| $328K | ﹤0.01% |
7,700
-18,500
| -71% | -$666K |
2026 Q1
2 quarters
|
|
4060
Steris
STE
$25.6B
| $328K | ﹤0.01% |
+1,562
| New | +$347K |
2026 Q3
0 quarters
|
|
4061
CALL
Paylocity
PCTY
$9.35B
| $328K | ﹤0.01% |
2,300
-1,600
| -41% | -$224K |
2017 Q3
36 quarters
|
|
4062
PUT
DELISTED
Velo3D, Inc.
VLD
| $328K | ﹤0.01% |
30,100
-1,500
| -5% | -$16.3K |
2026 Q1
2 quarters
|
|
4063
PUT
Grayscale Chainlink Trust ETF
GLNK
$103M
| $328K | ﹤0.01% |
26,000
+23,400
| +900% | +$209K |
2026 Q1
2 quarters
|
|
4064
Corbus Pharmaceuticals
CRBP
$70.7M
| $326K | ﹤0.01% |
+47,857
| New | +$442K |
2026 Q3
0 quarters
|
|
4065
PUT
Columbia Financial
CLBK
$3.02B
| $326K | ﹤0.01% |
29,500
+5,300
| +22% | +$58.5K |
2024 Q4
7 quarters
|
|
4066
NNN REIT
NNN
$7.95B
| $326K | ﹤0.01% |
7,938
-7,332
| -48% | -$335K |
2025 Q4
3 quarters
|
|
4067
PUT
Community Healthcare Trust
CHCT
$420M
| $326K | ﹤0.01% |
23,000
+21,300
| +1,253% | +$343K |
2023 Q3
12 quarters
|
|
4068
CALL
Global E Online
GLBE
$7B
| $326K | ﹤0.01% |
8,200
-19,800
| -71% | -$770K |
2021 Q4
19 quarters
|
|
4069
PUT
Navan Inc
NAVN
$6.74B
| $325K | ﹤0.01% |
15,500
+5,200
| +50% | +$134K |
2025 Q4
3 quarters
|
|
4070
InMode
INMD
$756M
| $325K | ﹤0.01% |
+22,925
| New | +$342K |
2026 Q3
0 quarters
|
|
4071
CALL
Sociedad Química y Minera de Chile
SQM
$15.2B
| $324K | ﹤0.01% |
5,000
-4,900
| -49% | -$354K |
2026 Q1
2 quarters
|
|
4072
CALL
Asana
ASAN
$2.23B
| $324K | ﹤0.01% |
38,400
-68,000
| -64% | -$589K |
2020 Q4
23 quarters
|
|
4073
Cullinan Oncology
CGEM
$660M
| $323K | ﹤0.01% |
21,056
+3,612
| +21% | +$69.2K |
2024 Q3
8 quarters
|
|
4074
Post Holdings
POST
$3.56B
| $323K | ﹤0.01% |
4,434
+2,149
| +94% | +$179K |
2026 Q2
1 quarter
|
|
4075
PUT
DELISTED
Supernus Pharmaceuticals
SUPN
| $323K | ﹤0.01% |
7,500
| – | – |
2026 Q1
2 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.