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 | |
|---|---|---|---|---|---|---|---|
| $11K | ﹤0.01% | +212 | New | +$11K | |||
| $11K | ﹤0.01% | +354 | New | +$11K | |||
| $11K | ﹤0.01% | 8,093 -4,688 | -37% | -$6.37K | |||
| $11K | ﹤0.01% | 214 +213 | +21,300% | +$10.9K | |||
| $11K | ﹤0.01% | 587 -3,206 | -85% | -$60.1K | |||
| $11K | ﹤0.01% | 650 +604 | +1,313% | +$10.2K | |||
| $11K | ﹤0.01% | 2,676 -8,829 | -77% | -$36.3K | |||
| $11K | ﹤0.01% | 1,935 -6,355 | -77% | -$36.1K | |||
| $11K | ﹤0.01% | 9,699 +8,154 | +528% | +$9.25K | |||
| $11K | ﹤0.01% | +271 | New | +$11K | |||
| $11K | ﹤0.01% | 335 -95 | -22% | -$3.12K | |||
| $10K | ﹤0.01% | +1,555 | New | +$10K | |||
| $10K | ﹤0.01% | 6,519 -1,926 | -23% | -$2.95K | |||
| $10K | ﹤0.01% | +300 | New | +$10K | |||
| $10K | ﹤0.01% | +406 | New | +$10K | |||
| $10K | ﹤0.01% | +71 | New | +$10K | |||
| $10K | ﹤0.01% | 6,117 +5,112 | +509% | +$8.36K | |||
| $10K | ﹤0.01% | 5,657 +2,213 | +64% | +$3.91K | |||
| $10K | ﹤0.01% | +204 | New | +$10K | |||
| $10K | ﹤0.01% | 199 -1,641 | -89% | -$82.5K | |||
| $10K | ﹤0.01% | 4,112 +391 | +11% | +$951 | |||
| $10K | ﹤0.01% | 2,576 -5,200 | -67% | -$20.2K | |||
| $10K | ﹤0.01% | 8,091 +7,847 | +3,216% | +$9.7K | |||
| $10K | ﹤0.01% | 7,766 +2,991 | +63% | +$3.85K | |||
| $10K | ﹤0.01% | +601 | New | +$10K |
