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 | 34.74% |
| 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 | |
|---|---|---|---|---|---|---|---|
| $28K | ﹤0.01% | 21,555 +15,971 | +286% | +$20.7K | |||
| $28K | ﹤0.01% | +357 | New | +$28K | |||
| $28K | ﹤0.01% | 825 +312 | +61% | +$10.6K | |||
| $28K | ﹤0.01% | 3,947 +3,060 | +345% | +$21.7K | |||
| $28K | ﹤0.01% | 4,599 -1,809 | -28% | -$11K | |||
| $28K | ﹤0.01% | 100 -24 | -19% | -$6.72K | |||
| $28K | ﹤0.01% | 1,210 -11,836 | -91% | -$274K | |||
| $27K | ﹤0.01% | 5,866 -9,405 | -62% | -$43.3K | |||
| $27K | ﹤0.01% | +379 | New | +$27K | |||
| $27K | ﹤0.01% | 1,597 +787 | +97% | +$13.3K | |||
| $27K | ﹤0.01% | +99 | New | +$27K | |||
| $27K | ﹤0.01% | +283 | New | +$27K | |||
| $27K | ﹤0.01% | 2,635 +1,535 | +140% | +$15.7K | |||
| $27K | ﹤0.01% | +1,489 | New | +$27K | |||
| $27K | ﹤0.01% | +498 | New | +$27K | |||
| $27K | ﹤0.01% | 9,724 +5,894 | +154% | +$16.4K | |||
| $26K | ﹤0.01% | +1,298 | New | +$26K | |||
| $26K | ﹤0.01% | +2,022 | New | +$26K | |||
| $26K | ﹤0.01% | +13,634 | New | +$26K | |||
| $26K | ﹤0.01% | +2,749 | New | +$26K | |||
| $26K | ﹤0.01% | +2,556 | New | +$26K | |||
| $26K | ﹤0.01% | 34,654 +28,049 | +425% | +$21K | |||
| $26K | ﹤0.01% | 1,391 -16,516 | -92% | -$309K | |||
| $26K | ﹤0.01% | 1,669 +1,540 | +1,194% | +$24K | |||
| $26K | ﹤0.01% | +11,833 | New | +$26K |
