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 | |
|---|---|---|---|---|---|---|---|
| $6K | ﹤0.01% | +199 | New | +$6K | |||
| $6K | ﹤0.01% | +86 | New | +$6K | |||
| $6K | ﹤0.01% | 9,215 -32,423 | -78% | -$21.1K | |||
| $6K | ﹤0.01% | 3,667 -18,803 | -84% | -$30.8K | |||
| $6K | ﹤0.01% | 397 -1,994 | -83% | -$30.1K | |||
| $6K | ﹤0.01% | 5,074 -10,911 | -68% | -$12.9K | |||
| $6K | ﹤0.01% | 2,419 -8,660 | -78% | -$21.5K | |||
| $6K | ﹤0.01% | +1,396 | New | +$6K | |||
| $6K | ﹤0.01% | 234 -5,896 | -96% | -$151K | |||
| $5K | ﹤0.01% | 270 +140 | +108% | +$2.59K | |||
| $5K | ﹤0.01% | 8,647 -6,902 | -44% | -$3.99K | |||
| $5K | ﹤0.01% | +2,512 | New | +$5K | |||
| $5K | ﹤0.01% | 13,298 +3,835 | +41% | +$1.44K | |||
| $5K | ﹤0.01% | +2,186 | New | +$5K | |||
| $5K | ﹤0.01% | +1,492 | New | +$5K | |||
| $5K | ﹤0.01% | +2,450 | New | +$5K | |||
| $5K | ﹤0.01% | +150 | New | +$5K | |||
| $5K | ﹤0.01% | 610 -4,562 | -88% | -$37.4K | |||
| $5K | ﹤0.01% | 413 +211 | +104% | +$2.55K | |||
| $5K | ﹤0.01% | +883 | New | +$5K | |||
| $5K | ﹤0.01% | 1,077 -8,706 | -89% | -$40.4K | |||
| $5K | ﹤0.01% | 124 -76 | -38% | -$3.07K | |||
| $5K | ﹤0.01% | +162 | New | +$5K | |||
| $5K | ﹤0.01% | 1,534 -1,530 | -50% | -$4.99K | |||
| $5K | ﹤0.01% | +84 | New | +$5K |
