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 | |
|---|---|---|---|---|---|---|---|
| $5K | ﹤0.01% | +544 | New | +$5K | |||
| $5K | ﹤0.01% | 644 +526 | +446% | +$4.08K | |||
| $5K | ﹤0.01% | 35 +23 | +192% | +$3.29K | |||
| $5K | ﹤0.01% | +196 | New | +$5K | |||
| $5K | ﹤0.01% | +41 | New | +$5K | |||
| $5K | ﹤0.01% | 8,467 +7,103 | +521% | +$4.2K | |||
| $5K | ﹤0.01% | +31 | New | +$5K | |||
| $5K | ﹤0.01% | 205 -9 | -4% | -$220 | |||
| $5K | ﹤0.01% | +100 | New | +$5K | |||
| $5K | ﹤0.01% | +403 | New | +$5K | |||
| $5K | ﹤0.01% | 447 -32 | -7% | -$358 | |||
| $5K | ﹤0.01% | 8,558 +3,337 | +64% | +$1.95K | |||
| $5K | ﹤0.01% | +57 | New | +$5K | |||
| $5K | ﹤0.01% | +73 | New | +$5K | |||
| $5K | ﹤0.01% | 123 -4,772 | -97% | -$194K | |||
| $5K | ﹤0.01% | 12,892 -7,995 | -38% | -$3.1K | |||
| $5K | ﹤0.01% | 466 +20 | +4% | +$215 | |||
| $5K | ﹤0.01% | +138 | New | +$5K | |||
| $5K | ﹤0.01% | 171 -3,140 | -95% | -$91.8K | |||
| $5K | ﹤0.01% | +261 | New | +$5K | |||
| $4K | ﹤0.01% | 70 | – | – | |||
| $4K | ﹤0.01% | +82 | New | +$4K | |||
| $4K | ﹤0.01% | +41 | New | +$4K | |||
| $4K | ﹤0.01% | +189 | New | +$4K | |||
| $4K | ﹤0.01% | +219 | New | +$4K |
