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 | $216M | |
| 2 | $159M | |
| 3 | $128M | |
| 4 | $62.2M | |
| 5 | $61.9M |
Top Sells
| 1 | $141M | |
| 2 | $53.1M | |
| 3 | $45.7M | |
| 4 | $45.3M | |
| 5 | $38.3M |
Sector Composition
| 1 | Technology | 34.86% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $4K | ﹤0.01% | 136 -1,513 | -92% | -$44.5K | |||
| $4K | ﹤0.01% | +208 | New | +$4K | |||
| $4K | ﹤0.01% | +275 | New | +$4K | |||
| $4K | ﹤0.01% | 151 +4 | +3% | +$106 | |||
| $4K | ﹤0.01% | 164 -1,627 | -91% | -$39.7K | |||
| $4K | ﹤0.01% | +1,361 | New | +$4K | |||
| $4K | ﹤0.01% | +252 | New | +$4K | |||
| $4K | ﹤0.01% | 82 -77 | -48% | -$3.76K | |||
| $4K | ﹤0.01% | 540 -392 | -42% | -$2.9K | |||
| $4K | ﹤0.01% | 406 -439 | -52% | -$4.33K | |||
| $4K | ﹤0.01% | +1,169 | New | +$4K | |||
| $4K | ﹤0.01% | +179 | New | +$4K | |||
| $4K | ﹤0.01% | +411 | New | +$4K | |||
| $4K | ﹤0.01% | 170 -98 | -37% | -$2.31K | |||
| $4K | ﹤0.01% | +725 | New | +$4K | |||
| $3K | ﹤0.01% | 201 -545 | -73% | -$8.13K | |||
| $3K | ﹤0.01% | 6,889 +5,489 | +392% | +$2.39K | |||
| $3K | ﹤0.01% | +755 | New | +$3K | |||
| $3K | ﹤0.01% | +48 | New | +$3K | |||
| $3K | ﹤0.01% | +248 | New | +$3K | |||
| $3K | ﹤0.01% | 98 -1,950 | -95% | -$59.7K | |||
| $3K | ﹤0.01% | 132 -2,748 | -95% | -$62.5K | |||
| $3K | ﹤0.01% | +915 | New | +$3K | |||
| $3K | ﹤0.01% | 634 +621 | +4,777% | +$2.94K | |||
| $3K | ﹤0.01% | 183 +133 | +266% | +$2.18K |
