We are live on !
Find out more
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 | |
|---|---|---|---|---|---|---|---|
4251
PUT
TSS Inc
TSSI
$174M
| $278K | ﹤0.01% |
28,600
-100
| -0.3% | -$972 |
2024 Q4
7 quarters
|
|
4252
CALL
Opko Health
OPK
$1.25B
| $278K | ﹤0.01% |
172,700
+3,600
| +2% | +$5.22K |
2021 Q2
21 quarters
|
|
4253
CALL
Eton Pharmaceutcials
ETON
$1.85B
| $278K | ﹤0.01% |
5,400
-5,800
| -52% | -$294K |
2021 Q2
21 quarters
|
|
4254
PUT
Corporacion America
CAAP
$4.08B
| $277K | ﹤0.01% |
10,900
-10,200
| -48% | -$252K |
2026 Q1
2 quarters
|
|
4255
CALL
Federal Signal
FSS
$7.03B
| $277K | ﹤0.01% |
2,500
-1,500
| -38% | -$180K |
2026 Q1
2 quarters
|
|
4256
PUT
NiSource
NI
$22.1B
| $277K | ﹤0.01% |
7,100
-40,500
| -85% | -$1.74M |
2022 Q4
15 quarters
|
|
4257
PUT
Cytokinetics
CYTK
$7.83B
| $277K | ﹤0.01% |
4,200
-59,400
| -93% | -$4.53M |
2021 Q2
21 quarters
|
|
4258
CALL
WisdomTree US Total Dividend Fund
DTD
$1.67B
| $277K | ﹤0.01% |
2,600
-5,000
| -66% | -$479K |
2014 Q4
47 quarters
|
|
4259
Ardelyx
ARDX
$774M
| $276K | ﹤0.01% |
80,706
-70,721
| -47% | -$303K |
2023 Q2
13 quarters
|
|
4260
Fundrise Innovation Fund
VCX
$797M
| $276K | ﹤0.01% |
+9,307
| New | +$401K |
2026 Q3
0 quarters
|
|
4261
CMS Energy
CMS
$22.1B
| $275K | ﹤0.01% |
4,367
+3,082
| +240% | +$216K |
2025 Q3
4 quarters
|
|
4262
CALL
CVR Energy
CVI
$4.47B
| $275K | ﹤0.01% |
5,400
+3,300
| +157% | +$130K |
2019 Q1
30 quarters
|
|
4263
ProShares Short Dow30
DOG
$120M
| $275K | ﹤0.01% |
+12,348
| New | +$267K |
2026 Q3
0 quarters
|
|
4264
CALL
Jones Lang LaSalle
JLL
$16.8B
| $275K | ﹤0.01% |
900
+600
| +200% | +$208K |
2018 Q1
34 quarters
|
|
4265
Geron
GERN
$622M
| $274K | ﹤0.01% |
222,647
+109,658
| +97% | +$157K |
2024 Q4
7 quarters
|
|
4266
PUT
Global Ship Lease
GSL
$1.55B
| $274K | ﹤0.01% |
6,200
+4,200
| +210% | +$181K |
2021 Q4
19 quarters
|
|
4267
Richtech Robotics
RR
$170M
| $274K | ﹤0.01% |
173,152
-51,749
| -23% | -$87.2K |
2025 Q3
4 quarters
|
|
4268
PUT
Weibo
WB
$1.51B
| $273K | ﹤0.01% |
42,300
-600
| -1% | -$4.38K |
2021 Q2
21 quarters
|
|
4269
CALL
Aeluma Inc
ALMU
$126M
| $273K | ﹤0.01% |
22,100
-16,100
| -42% | -$245K |
2025 Q3
4 quarters
|
|
4270
PUT
Defiance Nasdaq 100 Income Target ETF
QQQT
$51M
| $273K | ﹤0.01% |
+16,200
| New | +$291K |
2026 Q3
0 quarters
|
|
4271
CALL
Elbit Systems
ESLT
$32.9B
| $273K | ﹤0.01% |
400
| – | – |
2023 Q2
13 quarters
|
|
4272
Toll Brothers
TOL
$13.6B
| $272K | ﹤0.01% |
+2,021
| New | +$294K |
2026 Q3
0 quarters
|
|
4273
PUT
CVR Partners
UAN
$1.18B
| $272K | ﹤0.01% |
2,200
+1,500
| +214% | +$187K |
2020 Q4
23 quarters
|
|
4274
ProShares Short QQQ
PSQ
$666M
| $272K | ﹤0.01% |
10,968
+3,509
| +47% | +$90.7K |
2026 Q2
1 quarter
|
|
4275
PUT
Xanadu Quantum Technologies Class B
XNDU
$716M
| $272K | ﹤0.01% |
59,400
-29,200
| -33% | -$283K |
2026 Q2
1 quarter
|
|
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.