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 | |
|---|---|---|---|---|---|---|---|
| $9K | ﹤0.01% | +87 | New | +$9K | |||
| $9K | ﹤0.01% | +585 | New | +$9K | |||
| $9K | ﹤0.01% | +85 | New | +$9K | |||
| $9K | ﹤0.01% | 342 -373 | -52% | -$9.82K | |||
| $9K | ﹤0.01% | 8,139 -1,787 | -18% | -$1.98K | |||
| $9K | ﹤0.01% | 864 -7,854 | -90% | -$81.8K | |||
| $9K | ﹤0.01% | +289 | New | +$9K | |||
| $9K | ﹤0.01% | 1,458 -495 | -25% | -$3.06K | |||
| $9K | ﹤0.01% | 298 -591 | -66% | -$17.8K | |||
| $9K | ﹤0.01% | +129 | New | +$9K | |||
| $9K | ﹤0.01% | +440 | New | +$9K | |||
| $9K | ﹤0.01% | +419 | New | +$9K | |||
| $9K | ﹤0.01% | +2,649 | New | +$9K | |||
| $9K | ﹤0.01% | 856 -21,135 | -96% | -$222K | |||
| $9K | ﹤0.01% | 1,910 +973 | +104% | +$4.59K | |||
| $9K | ﹤0.01% | +95 | New | +$9K | |||
| $9K | ﹤0.01% | 262 -15,347 | -98% | -$527K | |||
| $9K | ﹤0.01% | +7,859 | New | +$9K | |||
| $9K | ﹤0.01% | 668 +507 | +315% | +$6.83K | |||
| $9K | ﹤0.01% | 4,731 -10,596 | -69% | -$20.2K | |||
| $9K | ﹤0.01% | +152 | New | +$9K | |||
| $8K | ﹤0.01% | 261 -745 | -74% | -$22.8K | |||
| $8K | ﹤0.01% | 4,105 -16,079 | -80% | -$31.3K | |||
| $8K | ﹤0.01% | 1,241 +670 | +117% | +$4.32K | |||
| $8K | ﹤0.01% | 35 +23 | +192% | +$5.26K |
