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 | |
|---|---|---|---|---|---|---|---|
| $18K | 0% | 1,444 | New | +$18K | |||
| $18K | 0% | 164 | New | +$18K | |||
| $18K | 0% | 390 | New | +$18K | |||
| $18K | 0% | 1,782 +383 | +27% | +$3.87K | |||
| $18K | 0% | 1,070 | New | +$18K | |||
| $18K | 0% | 1,087 -4,732 | -81% | -$78.4K | |||
| $18K | 0% | 318 | New | +$18K | |||
| $18K | 0% | 1,679 +1,289 | +331% | +$13.8K | |||
| $17K | 0% | 8,445 -16,734 | -66% | -$33.7K | |||
| $17K | 0% | 690 +668 | +3,036% | +$16.5K | |||
| $17K | 0% | 236 | New | +$17K | |||
| $17K | 0% | 305 +262 | +609% | +$14.6K | |||
| $17K | 0% | 6,353 | New | +$17K | |||
| $17K | 0% | 188 | New | +$17K | |||
| $17K | 0% | 644 | New | +$17K | |||
| $17K | 0% | 889 +487 | +121% | +$9.31K | |||
| $17K | 0% | 486 | New | +$17K | |||
| $17K | 0% | 62 | New | +$17K | |||
| $17K | 0% | 10,984 +3,312 | +43% | +$5.13K | |||
| $17K | 0% | 637 +295 | +86% | +$7.87K | |||
| $17K | 0% | 717 +100 | +16% | +$2.37K | |||
| $17K | 0% | 497 | New | +$17K | |||
| $17K | 0% | 4,277 +1,548 | +57% | +$6.15K | |||
| $16K | 0% | 1,463 -4,115 | -74% | -$45K | |||
| $16K | 0% | 3,468 +2,901 | +512% | +$13.4K |
