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 | |
|---|---|---|---|---|---|---|---|
| $12K | ﹤0.01% | +121 | New | +$12K | |||
| $12K | ﹤0.01% | 1,072 -1,185 | -53% | -$13.3K | |||
| $12K | ﹤0.01% | +483 | New | +$12K | |||
| $12K | ﹤0.01% | 2,546 +1,757 | +223% | +$8.28K | |||
| $12K | ﹤0.01% | 642 +622 | +3,110% | +$11.6K | |||
| $12K | ﹤0.01% | 509 +299 | +142% | +$7.05K | |||
| $12K | ﹤0.01% | 269 -1,512 | -85% | -$67.5K | |||
| $12K | ﹤0.01% | 3,709 +3,116 | +525% | +$10.1K | |||
| $12K | ﹤0.01% | 876 +215 | +33% | +$2.95K | |||
| $11K | ﹤0.01% | 5,152 +1,416 | +38% | +$3.02K | |||
| $11K | ﹤0.01% | +2,674 | New | +$11K | |||
| $11K | ﹤0.01% | 301 -1,181 | -80% | -$43.2K | |||
| $11K | ﹤0.01% | 6,591 -59,283 | -90% | -$98.9K | |||
| $11K | ﹤0.01% | 410 -21,845 | -98% | -$586K | |||
| $11K | ﹤0.01% | 371 -590 | -61% | -$17.5K | |||
| $11K | ﹤0.01% | +151 | New | +$11K | |||
| $11K | ﹤0.01% | 2,029 -2,236 | -52% | -$12.1K | |||
| $11K | ﹤0.01% | +653 | New | +$11K | |||
| $11K | ﹤0.01% | +125 | New | +$11K | |||
| $11K | ﹤0.01% | +225 | New | +$11K | |||
| $11K | ﹤0.01% | +175 | New | +$11K | |||
| $11K | ﹤0.01% | +220 | New | +$11K | |||
| $11K | ﹤0.01% | +140 | New | +$11K | |||
| $11K | ﹤0.01% | 458 +217 | +90% | +$5.21K | |||
| $11K | ﹤0.01% | +2,038 | New | +$11K |
