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 | |
|---|---|---|---|---|---|---|---|
| $5K | 0% | 214 -256 | -54% | -$5.98K | |||
| $5K | 0% | 663 | New | +$5K | |||
| $5K | 0% | 780 -6,454 | -89% | -$41.4K | |||
| $5K | 0% | 245 -2,715 | -92% | -$55.4K | |||
| $5K | 0% | 1,188 | New | +$5K | |||
| $5K | 0% | 508 -9,976 | -95% | -$98.2K | |||
| $5K | 0% | 355 +295 | +492% | +$4.16K | |||
| $5K | 0% | 125 | New | +$5K | |||
| $5K | 0% | 174 -86 | -33% | -$2.47K | |||
| $5K | 0% | 184 -11 | -6% | -$299 | |||
| $5K | 0% | 100 | New | +$5K | |||
| $5K | 0% | 2,194 | New | +$5K | |||
| $5K | 0% | 259 | New | +$5K | |||
| $5K | 0% | 130 | New | +$5K | |||
| $5K | 0% | 31 | New | +$5K | |||
| $5K | 0% | 19,684 | New | +$5K | |||
| $5K | 0% | 45 +2 | +5% | +$222 | |||
| $5K | 0% | 652 | New | +$5K | |||
| $5K | 0% | 91 | New | +$5K | |||
| $5K | 0% | 297 +2 | +0.7% | +$34 | |||
| $5K | 0% | 108 | New | +$5K | |||
| $5K | 0% | 3,932 -45,034 | -92% | -$57.3K | |||
| $5K | 0% | 256 -6,388 | -96% | -$125K | |||
| $5K | 0% | 102 | New | +$5K | |||
| $5K | 0% | 330 | New | +$5K |
