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 | |
|---|---|---|---|---|---|---|---|
| $3K | ﹤0.01% | +50 | New | +$3K | |||
| $3K | ﹤0.01% | +61 | New | +$3K | |||
| $3K | ﹤0.01% | 153 -18,731 | -99% | -$367K | |||
| $3K | ﹤0.01% | +1,572 | New | +$3K | |||
| $3K | ﹤0.01% | 3,454 -7,278 | -68% | -$6.32K | |||
| $3K | ﹤0.01% | 31 -715 | -96% | -$69.2K | |||
| $3K | ﹤0.01% | +116 | New | +$3K | |||
| $3K | ﹤0.01% | +22 | New | +$3K | |||
| $3K | ﹤0.01% | 336 -37,944 | -99% | -$339K | |||
| $3K | ﹤0.01% | +28 | New | +$3K | |||
| $3K | ﹤0.01% | 212 +200 | +1,667% | +$2.83K | |||
| $3K | ﹤0.01% | +25 | New | +$3K | |||
| $3K | ﹤0.01% | 572 -767 | -57% | -$4.02K | |||
| $3K | ﹤0.01% | +99 | New | +$3K | |||
| $3K | ﹤0.01% | +527 | New | +$3K | |||
| $3K | ﹤0.01% | +84 | New | +$3K | |||
| $3K | ﹤0.01% | 902 -252 | -22% | -$838 | |||
| $3K | ﹤0.01% | 2,073 -14,264 | -87% | -$20.6K | |||
| $3K | ﹤0.01% | 2,828 +2,008 | +245% | +$2.13K | |||
| $3K | ﹤0.01% | +539 | New | +$3K | |||
| $3K | ﹤0.01% | +92 | New | +$3K | |||
| $3K | ﹤0.01% | 3,376 -2,048 | -38% | -$1.82K | |||
| $3K | ﹤0.01% | 282 -54 | -16% | -$574 | |||
| $3K | ﹤0.01% | 304 +137 | +82% | +$1.35K | |||
| $3K | ﹤0.01% | 217 -853 | -80% | -$11.8K |
