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 | |
|---|---|---|---|---|---|---|---|
|
OGG
5501
Osisko Gold Group
OGG
$859M
| $69.3K | ﹤0.01% |
21,337
+6,258
| +42% | +$23.3K |
2025 Q4
1 quarter
|
|
5502
CALL
Xponential Fitness
XPOF
$198M
| $69.2K | ﹤0.01% |
11,500
-313,200
| -96% | -$2.26M |
2021 Q4
17 quarters
|
|
5503
PUT
KULR Technology Group
KULR
$123M
| $69.2K | ﹤0.01% |
29,200
-231,000
| -89% | -$717K |
2024 Q2
7 quarters
|
|
5504
PUT
PagSeguro Digital
PAGS
$2.49B
| $69.1K | ﹤0.01% |
6,900
-6,100
| -47% | -$63.6K |
2018 Q2
31 quarters
|
|
|
LB
5505
PUT
LandBridge Co
LB
$2.48B
| $69K | ﹤0.01% |
1,000
-1,600
| -62% | -$102K |
2024 Q4
5 quarters
|
|
5506
PUT
Bridgewater Bancshares
BWB
$577M
| $69K | ﹤0.01% |
+3,900
| New | +$71.5K |
2026 Q1
0 quarters
|
|
|
XMAG
5507
Defiance Large Cap ex-Mag 7 ETF
XMAG
$196M
| $68.8K | ﹤0.01% |
+3,098
| New | +$70.8K |
2026 Q1
0 quarters
|
|
5508
CALL
Castle Biosciences
CSTL
$1.09B
| $68.7K | ﹤0.01% |
2,800
+2,200
| +367% | +$72.1K |
2025 Q4
1 quarter
|
|
5509
CALL
Aldeyra Therapeutics
ALDX
$70.6M
| $68.6K | ﹤0.01% |
40,600
-40,800
| -50% | -$179K |
2020 Q2
23 quarters
|
|
5510
PUT
AMC Global Media
AMCX
$460M
| $68.6K | ﹤0.01% |
10,100
+100
| +1% | +$778 |
2021 Q2
19 quarters
|
|
|
JHG
5511
DELISTED
Janus Henderson
JHG
| $68.5K | ﹤0.01% |
1,333
-17,525
| -93% | -$868K |
2025 Q3
2 quarters
|
|
5512
PUT
Intrepid Potash
IPI
$441M
| $68.4K | ﹤0.01% |
+1,600
| New | +$57.5K |
2026 Q1
0 quarters
|
|
5513
PUT
GeoPark
GPRK
$704M
| $68.4K | ﹤0.01% |
7,200
-1,000
| -12% | -$8.42K |
2023 Q3
10 quarters
|
|
5514
PUT
Baytex Energy
BTE
$3.24B
| $68.4K | ﹤0.01% |
15,300
+9,600
| +168% | +$35.4K |
2023 Q2
11 quarters
|
|
5515
G-III Apparel Group
GIII
$1.17B
| $68.4K | ﹤0.01% |
+2,468
| New | +$72.2K |
2026 Q1
0 quarters
|
|
5516
ROBO Global Robotics & Automation Index ETF
ROBO
$2.08B
| $68.4K | ﹤0.01% |
+999
| New | +$73.4K |
2026 Q1
0 quarters
|
|
5517
CALL
American Public Education
APEI
$800M
| $68.3K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$50.4K |
2025 Q3
2 quarters
|
|
5518
Vivani Medical
VANI
$111M
| $68.2K | ﹤0.01% |
+68,199
| New | +$85.3K |
2026 Q1
0 quarters
|
|
5519
Metallus
MTUS
$824M
| $68.1K | ﹤0.01% |
4,169
-5,225
| -56% | -$95.9K |
2025 Q2
3 quarters
|
|
5520
PUT
American States Water
AWR
$3.28B
| $68.1K | ﹤0.01% |
900
+500
| +125% | +$36.9K |
2025 Q3
2 quarters
|
|
|
ALM
5521
CALL
Almonty Industries
ALM
$3.87B
| $68.1K | ﹤0.01% |
+4,700
| New | +$67.2K |
2026 Q1
0 quarters
|
|
5522
CALL
Natural Gas Services Group
NGS
$428M
| $67.9K | ﹤0.01% |
1,800
-5,500
| -75% | -$201K |
2023 Q4
9 quarters
|
|
5523
CALL
MediaAlpha
MAX
$510M
| $67.9K | ﹤0.01% |
+7,300
| New | +$71.9K |
2026 Q1
0 quarters
|
|
5524
PUT
Credicorp
BAP
$29.6B
| $67.8K | ﹤0.01% |
200
| – | – |
2025 Q4
1 quarter
|
|
5525
PUT
Allogene Therapeutics
ALLO
$518M
| $67.8K | ﹤0.01% |
27,800
+25,000
| +893% | +$50.1K |
2023 Q4
9 quarters
|
|
Similar funds
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.