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 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $7K | 0% | 54 -87 | -62% | -$11.3K | |||
| $7K | 0% | 3,721 -5,721 | -61% | -$10.8K | |||
| $7K | 0% | 92 | New | +$7K | |||
| $7K | 0% | 10,142 +949 | +10% | +$655 | |||
| $7K | 0% | 135 | New | +$7K | |||
| $7K | 0% | 5,303 +725 | +16% | +$957 | |||
| $7K | 0% | 136 | New | +$7K | |||
| $7K | 0% | 121 +36 | +42% | +$2.08K | |||
| $7K | 0% | 9,210 +2,028 | +28% | +$1.54K | |||
| $7K | 0% | 1,724 | New | +$7K | |||
| $7K | 0% | 261 | New | +$7K | |||
| $7K | 0% | 100 | New | +$7K | |||
| $7K | 0% | 160 -731 | -82% | -$32K | |||
| $7K | 0% | 209 +171 | +450% | +$5.73K | |||
| $7K | 0% | 1,497 -14,805 | -91% | -$69.2K | |||
| $7K | 0% | 55,582 -591,339 | -91% | -$74.5K | |||
| $6K | 0% | 135 -825 | -86% | -$36.7K | |||
| $6K | 0% | 15,549 -3,991 | -20% | -$1.54K | |||
| $6K | 0% | 819 -1,988 | -71% | -$14.6K | |||
| $6K | 0% | 198 | New | +$6K | |||
| $6K | 0% | 229 +86 | +60% | +$2.25K | |||
| $6K | 0% | 100 | New | +$6K | |||
| $6K | 0% | 11,634 -3,801 | -25% | -$1.96K | |||
| $6K | 0% | 4,806 +3,263 | +211% | +$4.07K | |||
| $6K | 0% | 576 +82 | +17% | +$854 |
