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 | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $72K | 0% | 43,915 | New | +$72K | |||
| $72K | 0% | 19,077 +17,108 | +869% | +$64.6K | |||
| $72K | 0% | 18,611 | New | +$72K | |||
| $71K | 0% | 234 +56 | +31% | +$17K | |||
| $71K | 0% | 10,882 | New | +$71K | |||
| $70K | 0% | 15,271 +8,341 | +120% | +$38.2K | |||
| $70K | 0% | 411 | New | +$70K | |||
| $70K | 0% | 2,369 | New | +$70K | |||
| $70K | 0% | 8,373 +8,000 | +2,145% | +$66.9K | |||
| $70K | 0% | 1,140 +525 | +85% | +$32.2K | |||
| $70K | 0% | 2,300 +653 | +40% | +$19.9K | |||
| $70K | 0% | 2,841 | New | +$70K | |||
| $69K | 0% | 7,326 | New | +$69K | |||
| $69K | 0% | 2,620 +2,388 | +1,029% | +$62.9K | |||
| $69K | 0% | 8,572 -4,156 | -33% | -$33.5K | |||
| $69K | 0% | 2,162 -10,103 | -82% | -$322K | |||
| $68K | 0% | 361 | New | +$68K | |||
| $68K | 0% | 37,239 -167,755 | -82% | -$306K | |||
| $68K | 0% | 5,617 -1,978 | -26% | -$23.9K | |||
| $67K | 0% | 1,288 | New | +$67K | |||
| $67K | 0% | 102,289 | New | +$67K | |||
| $66K | 0% | 14,979 -8,127 | -35% | -$35.8K | |||
| $66K | 0% | 3,129 +982 | +46% | +$20.7K | |||
| $65K | 0% | 1,555 | New | +$65K | |||
| $65K | 0% | 510 -2,884 | -85% | -$368K |
