Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
|
GEVX
4201
Tradr 2X Long GEV Daily ETF
GEVX
$38.2M
| $219K | ﹤0.01% |
12,693
-9,363
| -42% | -$135K |
2025 Q3
2 quarters
|
|
4202
PUT
Mattel
MAT
$4.3B
| $219K | ﹤0.01% |
15,100
-89,500
| -86% | -$1.63M |
2014 Q4
45 quarters
|
|
|
EFC
4203
CALL
Ellington Financial
EFC
$1.51B
| $219K | ﹤0.01% |
18,500
+11,400
| +161% | +$145K |
2020 Q1
24 quarters
|
|
4204
CALL
Quantum-Si Incorporated
QSI
$313M
| $219K | ﹤0.01% |
283,200
-38,100
| -12% | -$39.5K |
2021 Q1
20 quarters
|
|
4205
CALL
Sidus Space
SIDU
$180M
| $219K | ﹤0.01% |
+94,400
| New | +$257K |
2026 Q1
0 quarters
|
|
4206
Keysight
KEYS
$63.7B
| $219K | ﹤0.01% |
+775
| New | +$194K |
2026 Q1
0 quarters
|
|
4207
PUT
Robert Half
RHI
$3.87B
| $218K | ﹤0.01% |
8,600
-87,300
| -91% | -$2.31M |
2019 Q1
28 quarters
|
|
4208
FuboTV Inc
FUBO
$268M
| $218K | ﹤0.01% |
23,062
-19,245
| -45% | -$381K |
2024 Q4
5 quarters
|
|
4209
CALL
Lightspeed Commerce
LSPD
$1.25B
| $218K | ﹤0.01% |
24,300
-600
| -2% | -$5.99K |
2020 Q4
21 quarters
|
|
4210
PUT
Brink's
BCO
$4.12B
| $218K | ﹤0.01% |
2,100
-400
| -16% | -$48K |
2025 Q2
3 quarters
|
|
|
MTA
4211
CALL
Metalla Royalty & Streaming
MTA
$867M
| $217K | ﹤0.01% |
+32,800
| New | +$259K |
2026 Q1
0 quarters
|
|
4212
PUT
Woodside Energy
WDS
$41.4B
| $217K | ﹤0.01% |
9,100
+6,200
| +214% | +$121K |
2022 Q3
14 quarters
|
|
4213
PUT
Zevra Therapeutics
ZVRA
$605M
| $217K | ﹤0.01% |
23,300
-6,700
| -22% | -$60.4K |
2021 Q1
20 quarters
|
|
|
LKFT
4214
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.89B
| $217K | ﹤0.01% |
7,227
+7,153
| +9,666% | +$237K |
2025 Q3
2 quarters
|
|
4215
CALL
Agios Pharmaceuticals
AGIO
$1.94B
| $217K | ﹤0.01% |
6,400
-12,400
| -66% | -$352K |
2017 Q4
33 quarters
|
|
4216
Levi Strauss
LEVI
$7.67B
| $216K | ﹤0.01% |
+11,684
| New | +$239K |
2026 Q1
0 quarters
|
|
4217
CALL
Global Ship Lease
GSL
$1.64B
| $216K | ﹤0.01% |
5,800
-2,100
| -27% | -$79.1K |
2021 Q4
17 quarters
|
|
4218
CALL
Sagimet Biosciences
SGMT
$582M
| $216K | ﹤0.01% |
41,300
+11,300
| +38% | +$63K |
2024 Q4
5 quarters
|
|
4219
PUT
Zymeworks
ZYME
$1.86B
| $215K | ﹤0.01% |
8,600
-6,000
| -41% | -$142K |
2018 Q4
29 quarters
|
|
4220
CALL
Porch Group
PRCH
$1.9B
| $215K | ﹤0.01% |
30,000
-3,800
| -11% | -$30.4K |
2021 Q1
20 quarters
|
|
|
AIRL
4221
PUT
DELISTED
Themes Airlines ETF
AIRL
| $215K | ﹤0.01% |
39,800
+18,300
| +85% | +$98.8K |
2025 Q2
3 quarters
|
|
4222
PUT
Aldeyra Therapeutics
ALDX
$77.8M
| $215K | ﹤0.01% |
127,100
+102,900
| +425% | +$451K |
2020 Q3
22 quarters
|
|
4223
PUT
Primoris Services
PRIM
$4.1B
| $215K | ﹤0.01% |
+1,500
| New | +$220K |
2026 Q1
0 quarters
|
|
4224
PUT
Arbutus Biopharma
ABUS
$903M
| $214K | ﹤0.01% |
47,600
-12,800
| -21% | -$56K |
2021 Q2
19 quarters
|
|
4225
Booz Allen Hamilton
BAH
$8.48B
| $214K | ﹤0.01% |
+2,742
| New | +$231K |
2026 Q1
0 quarters
|
|
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Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.