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
| 1 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $3K | 0% | 140 -1,100 | -89% | -$23.6K | |||
| $3K | 0% | 2,575 -1,192 | -32% | -$1.39K | |||
| $3K | 0% | 6,611 -741 | -10% | -$336 | |||
| $3K | 0% | 1,571 -17,208 | -92% | -$32.9K | |||
| $3K | 0% | 9,463 | New | +$3K | |||
| $3K | 0% | 7,236 +5,032 | +228% | +$2.09K | |||
| $3K | 0% | 1,186 | New | +$3K | |||
| $3K | 0% | 344 | New | +$3K | |||
| $3K | 0% | 198 | New | +$3K | |||
| $3K | 0% | 138 +118 | +590% | +$2.57K | |||
| $3K | 0% | 327 -6,219 | -95% | -$57.1K | |||
| $3K | 0% | 78 | New | +$3K | |||
| $3K | 0% | 100 | – | – | |||
| $3K | 0% | 161 -226 | -58% | -$4.21K | |||
| $3K | 0% | 202 -303 | -60% | -$4.5K | |||
| $3K | 0% | 44 -199 | -82% | -$13.6K | |||
| $3K | 0% | 6,900 +6,800 | +6,800% | +$2.96K | |||
| $3K | 0% | 7,624 -1,665 | -18% | -$655 | |||
| $3K | 0% | 101 -19 | -16% | -$564 | |||
| $3K | 0% | 453 -21,508 | -98% | -$142K | |||
| $3K | 0% | 134 +67 | +100% | +$1.5K | |||
| $3K | 0% | 321 -678 | -68% | -$6.34K | |||
| $3K | 0% | 77 +57 | +285% | +$2.22K | |||
| $3K | 0% | 32 -363 | -92% | -$34K | |||
| $3K | 0% | 34 | New | +$3K |
