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 | |
|---|---|---|---|---|---|---|---|
| $1K | ﹤0.01% | 5,149 +4,463 | +651% | +$867 | |||
| $1K | ﹤0.01% | 66 +43 | +187% | +$652 | |||
| $1K | ﹤0.01% | +418 | New | +$1K | |||
| $1K | ﹤0.01% | +39 | New | +$1K | |||
| $1K | ﹤0.01% | +19 | New | +$1K | |||
| $1K | ﹤0.01% | 1,455 -374 | -20% | -$257 | |||
| $1K | ﹤0.01% | +128 | New | +$1K | |||
| $1K | ﹤0.01% | 43 | – | – | |||
| $1K | ﹤0.01% | +401 | New | +$1K | |||
| $1K | ﹤0.01% | 82 +66 | +413% | +$805 | |||
| $1K | ﹤0.01% | 856 -3,252 | -79% | -$3.8K | |||
| $1K | ﹤0.01% | +576 | New | +$1K | |||
| $1K | ﹤0.01% | 197 -58 | -23% | -$294 | |||
| $1K | ﹤0.01% | 159 -149 | -48% | -$937 | |||
| $1K | ﹤0.01% | 2,427 -2,055 | -46% | -$847 | |||
| $1K | ﹤0.01% | 122 -203 | -62% | -$1.66K | |||
| $1K | ﹤0.01% | +30 | New | +$1K | |||
| $1K | ﹤0.01% | 76 | – | – | |||
| $1K | ﹤0.01% | +1,967 | New | +$1K | |||
| $1K | ﹤0.01% | 135 +1 | +0.8% | +$7 | |||
| $1K | ﹤0.01% | 39 -5,765 | -99% | -$148K | |||
| $1K | ﹤0.01% | 1,338 -36,745 | -96% | -$27.5K | |||
| $1K | ﹤0.01% | 33 -165 | -83% | -$5K | |||
| $1K | ﹤0.01% | 42 -433 | -91% | -$10.3K | |||
| $1K | ﹤0.01% | 57 -1,141 | -95% | -$20K |
