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 | |
|---|---|---|---|---|---|---|---|
| $2K | 0% | 116 | New | +$2K | |||
| $2K | 0% | 5,221 -43,047 | -89% | -$16.5K | |||
| $2K | 0% | 408 +396 | +3,300% | +$1.94K | |||
| $2K | 0% | 81 | New | +$2K | |||
| $2K | 0% | 2,513 -147,041 | -98% | -$117K | |||
| $2K | 0% | 62 -1,291 | -95% | -$41.6K | |||
| $2K | 0% | 1,545 | New | +$2K | |||
| $2K | 0% | 1,853 | New | +$2K | |||
| $2K | 0% | 154 | New | +$2K | |||
| $2K | 0% | 76 -1,331 | -95% | -$35K | |||
| $2K | 0% | 165 | New | +$2K | |||
| $2K | 0% | 100 -105 | -51% | -$2.1K | |||
| $2K | 0% | 200 -32,825 | -99% | -$328K | |||
| $2K | 0% | 12 -102 | -89% | -$17K | |||
| $2K | 0% | 111 +70 | +171% | +$1.26K | |||
| $2K | 0% | 69 | New | +$2K | |||
| $2K | 0% | 824 | New | +$2K | |||
| $2K | 0% | 49 -572 | -92% | -$23.3K | |||
| $2K | 0% | 2,395 -4,513 | -65% | -$3.77K | |||
| $2K | 0% | 2,242 -50,997 | -96% | -$45.5K | |||
| $2K | 0% | 52 | New | +$2K | |||
| $2K | 0% | 70 -55 | -44% | -$1.57K | |||
| $2K | 0% | 111 | New | +$2K | |||
| $2K | 0% | 133 -26,720 | -100% | -$402K | |||
| $2K | 0% | 222 | New | +$2K |
