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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 | |
|---|---|---|---|---|---|---|---|
4451
ProShares Ultra Yen
YCL
$26.5M
| $234K | ﹤0.01% |
12,822
+7,214
| +129% | +$130K |
2025 Q1
6 quarters
|
|
4452
CALL
Arcturus Therapeutics
ARCT
$241M
| $234K | ﹤0.01% |
17,100
+6,400
| +60% | +$66.9K |
2019 Q1
30 quarters
|
|
4453
ProShares UltraPro Short Dow 30
SDOW
$158M
| $234K | ﹤0.01% |
8,968
-37,326
| -81% | -$886K |
2025 Q4
3 quarters
|
|
4454
PUT
American Century Diversified Corporate Bond ETF
KORP
$942M
| $233K | ﹤0.01% |
2,100
+1,900
| +950% | +$87K |
2022 Q3
16 quarters
|
|
4455
Exelixis
EXEL
$16.8B
| $233K | ﹤0.01% |
3,991
-3,207
| -45% | -$179K |
2026 Q2
1 quarter
|
|
4456
CALL
iQIYI
IQ
$799M
| $233K | ﹤0.01% |
233,000
-5,500
| -2% | -$6.13K |
2018 Q2
33 quarters
|
|
4457
CALL
Jackson Financial
JXN
$9.18B
| $233K | ﹤0.01% |
1,800
-4,500
| -71% | -$576K |
2021 Q4
19 quarters
|
|
4458
PUT
CNH Industrial
CNH
$19.1B
| $233K | ﹤0.01% |
18,100
-23,500
| -56% | -$275K |
2019 Q3
28 quarters
|
|
4459
CALL
Forward Industries Inc
FWDI
$402M
| $232K | ﹤0.01% |
29,800
+20,300
| +214% | +$110K |
2025 Q4
3 quarters
|
|
4460
State Street SPDR NYSE Technology ETF
XNTK
$1.75B
| $232K | ﹤0.01% |
607
+545
| +879% | +$196K |
2026 Q2
1 quarter
|
|
4461
SK Telecom
SKM
$13.3B
| $232K | ﹤0.01% |
+6,644
| New | +$234K |
2026 Q3
0 quarters
|
|
4462
Parsons
PSN
$5.25B
| $232K | ﹤0.01% |
+5,653
| New | +$279K |
2026 Q3
0 quarters
|
|
4463
PUT
Versant Media Group
VSNT
$4.91B
| $231K | ﹤0.01% |
7,300
+2,400
| +49% | +$88.8K |
2026 Q1
2 quarters
|
|
4464
BJ's Restaurants
BJRI
$1.22B
| $231K | ﹤0.01% |
4,033
+3,999
| +11,762% | +$256K |
2026 Q1
2 quarters
|
|
4465
PUT
Encompass Health
EHC
$13.8B
| $231K | ﹤0.01% |
1,900
-400
| -17% | -$47.1K |
2025 Q1
6 quarters
|
|
4466
Volatility Shares Trust XRP 2X ETF
XRPT
$43.1M
| $231K | ﹤0.01% |
6,149
+3,814
| +163% | +$109K |
2025 Q2
5 quarters
|
|
4467
PUT
Remitly
RELY
$4.83B
| $230K | ﹤0.01% |
10,800
-200
| -2% | -$4.78K |
2024 Q1
10 quarters
|
|
4468
CAVA Group
CAVA
$6.8B
| $230K | ﹤0.01% |
+4,258
| New | +$271K |
2026 Q3
0 quarters
|
|
4469
iShares Bitcoin Trust
IBIT
$55.2B
| $230K | ﹤0.01% |
4,859
-198,319
| -98% | -$8M |
2025 Q1
6 quarters
|
|
4470
CALL
Warrior Met Coal
HCC
$4.4B
| $229K | ﹤0.01% |
2,600
-26,100
| -91% | -$2.38M |
2019 Q1
30 quarters
|
|
4471
CALL
Corporacion America
CAAP
$4.08B
| $229K | ﹤0.01% |
9,000
-30,500
| -77% | -$753K |
2022 Q4
15 quarters
|
|
4472
GRAIL Inc
GRAL
$5.21B
| $229K | ﹤0.01% |
1,634
-2,728
| -63% | -$216K |
2025 Q4
3 quarters
|
|
4473
iShares Core S&P Small-Cap ETF
IJR
$106B
| $229K | ﹤0.01% |
1,683
-2,166
| -56% | -$313K |
2026 Q1
2 quarters
|
|
4474
Community Healthcare Trust
CHCT
$423M
| $228K | ﹤0.01% |
+16,112
| New | +$260K |
2026 Q3
0 quarters
|
|
4475
Columbus McKinnon
CMCO
$599M
| $228K | ﹤0.01% |
14,335
+5,829
| +69% | +$98.3K |
2025 Q1
6 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.