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% | +185 | New | +$3K | |||
| $3K | ﹤0.01% | 667 +416 | +166% | +$1.87K | |||
| $3K | ﹤0.01% | +461 | New | +$3K | |||
| $3K | ﹤0.01% | 34 -63 | -65% | -$5.56K | |||
| $3K | ﹤0.01% | 27,510 +7,003 | +34% | +$764 | |||
| $3K | ﹤0.01% | +1,641 | New | +$3K | |||
| $3K | ﹤0.01% | +261 | New | +$3K | |||
| $3K | ﹤0.01% | +3,001 | New | +$3K | |||
| $3K | ﹤0.01% | 40 -311 | -89% | -$23.3K | |||
| $3K | ﹤0.01% | 63 -12 | -16% | -$571 | |||
| $3K | ﹤0.01% | 83 -7 | -8% | -$253 | |||
| $3K | ﹤0.01% | +683 | New | +$3K | |||
| $3K | ﹤0.01% | 182 -247 | -58% | -$4.07K | |||
| $3K | ﹤0.01% | +102 | New | +$3K | |||
| $3K | ﹤0.01% | +100 | New | +$3K | |||
| $2K | ﹤0.01% | 464 -4,854 | -91% | -$20.9K | |||
| $2K | ﹤0.01% | 594 +555 | +1,423% | +$1.87K | |||
| $2K | ﹤0.01% | 15,915 -8,437 | -35% | -$1.06K | |||
| $2K | ﹤0.01% | +105 | New | +$2K | |||
| $2K | ﹤0.01% | 1,828 +971 | +113% | +$1.06K | |||
| $2K | ﹤0.01% | +90 | New | +$2K | |||
| $2K | ﹤0.01% | 170 +123 | +262% | +$1.45K | |||
| $2K | ﹤0.01% | 312 -264 | -46% | -$1.69K | |||
| $2K | ﹤0.01% | +100 | New | +$2K | |||
| $2K | ﹤0.01% | 2,144 -5,677 | -73% | -$5.3K |
