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 | |
|---|---|---|---|---|---|---|---|
| $4K | ﹤0.01% | +100 | New | +$4K | |||
| $4K | ﹤0.01% | 196 -2,848 | -94% | -$58.1K | |||
| $4K | ﹤0.01% | 313 -2,378 | -88% | -$30.4K | |||
| $4K | ﹤0.01% | 86 +9 | +12% | +$419 | |||
| $4K | ﹤0.01% | +265 | New | +$4K | |||
| $4K | ﹤0.01% | 168 -1,005 | -86% | -$23.9K | |||
| $4K | ﹤0.01% | 3,848 +1,891 | +97% | +$1.97K | |||
| $4K | ﹤0.01% | +91 | New | +$4K | |||
| $4K | ﹤0.01% | 80 +40 | +100% | +$2K | |||
| $4K | ﹤0.01% | +241 | New | +$4K | |||
| $4K | ﹤0.01% | 239 +209 | +697% | +$3.5K | |||
| $4K | ﹤0.01% | 71 -707 | -91% | -$39.8K | |||
| $4K | ﹤0.01% | 250 +156 | +166% | +$2.5K | |||
| $4K | ﹤0.01% | +83 | New | +$4K | |||
| $4K | ﹤0.01% | +135 | New | +$4K | |||
| $4K | ﹤0.01% | 139 +38 | +38% | +$1.09K | |||
| $4K | ﹤0.01% | +232 | New | +$4K | |||
| $4K | ﹤0.01% | +2,011 | New | +$4K | |||
| $4K | ﹤0.01% | 3,149 -11,986 | -79% | -$15.2K | |||
| $4K | ﹤0.01% | 259 +257 | +12,850% | +$3.97K | |||
| $4K | ﹤0.01% | +269 | New | +$4K | |||
| $4K | ﹤0.01% | 827 -3,765 | -82% | -$18.2K | |||
| $4K | ﹤0.01% | 198 +89 | +82% | +$1.8K | |||
| $4K | ﹤0.01% | 11,614 +5,273 | +83% | +$1.82K | |||
| $4K | ﹤0.01% | +300 | New | +$4K |
