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 | |
|---|---|---|---|---|---|---|---|
| $2K | ﹤0.01% | 42 -137 | -77% | -$6.52K | |||
| $2K | ﹤0.01% | +63 | New | +$2K | |||
| $2K | ﹤0.01% | +2,193 | New | +$2K | |||
| $2K | ﹤0.01% | 89 +31 | +53% | +$697 | |||
| $2K | ﹤0.01% | 216 -1,385 | -87% | -$12.8K | |||
| $2K | ﹤0.01% | +29 | New | +$2K | |||
| $2K | ﹤0.01% | +2,491 | New | +$2K | |||
| $2K | ﹤0.01% | +90 | New | +$2K | |||
| $2K | ﹤0.01% | +87 | New | +$2K | |||
| $2K | ﹤0.01% | 37 +34 | +1,133% | +$1.84K | |||
| $2K | ﹤0.01% | 169 -647 | -79% | -$7.66K | |||
| $2K | ﹤0.01% | 125 +25 | +25% | +$400 | |||
| $2K | ﹤0.01% | +145 | New | +$2K | |||
| $2K | ﹤0.01% | 112 +41 | +58% | +$732 | |||
| $2K | ﹤0.01% | 92 -8 | -8% | -$174 | |||
| $2K | ﹤0.01% | 267 +257 | +2,570% | +$1.93K | |||
| $2K | ﹤0.01% | 226 +200 | +769% | +$1.77K | |||
| $2K | ﹤0.01% | +50 | New | +$2K | |||
| $2K | ﹤0.01% | +14 | New | +$2K | |||
| $2K | ﹤0.01% | 80 -24 | -23% | -$600 | |||
| $2K | ﹤0.01% | 106 -113 | -52% | -$2.13K | |||
| $2K | ﹤0.01% | 37 -63 | -63% | -$3.41K | |||
| $2K | ﹤0.01% | +18 | New | +$2K | |||
| $2K | ﹤0.01% | 11,934 +6,305 | +112% | +$1.06K | |||
| $2K | ﹤0.01% | +864 | New | +$2K |
