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 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $12K | 0% | 524 | New | +$12K | |||
| $12K | 0% | 3,830 | New | +$12K | |||
| $12K | 0% | 110 -106 | -49% | -$11.6K | |||
| $11K | 0% | 326 | New | +$11K | |||
| $11K | 0% | 948 +732 | +339% | +$8.49K | |||
| $11K | 0% | 293 -472 | -62% | -$17.7K | |||
| $11K | 0% | 106 | New | +$11K | |||
| $11K | 0% | 5,584 -57,621 | -91% | -$114K | |||
| $11K | 0% | 215 | New | +$11K | |||
| $11K | 0% | 300 -11,585 | -97% | -$425K | |||
| $11K | 0% | 474 -1,301 | -73% | -$30.2K | |||
| $11K | 0% | 14,380 | New | +$11K | |||
| $11K | 0% | 10,732 -49,059 | -82% | -$50.3K | |||
| $11K | 0% | 2,377 +682 | +40% | +$3.16K | |||
| $11K | 0% | 505 | New | +$11K | |||
| $11K | 0% | 165 +73 | +79% | +$4.87K | |||
| $11K | 0% | 15,257 +12,330 | +421% | +$8.89K | |||
| $11K | 0% | 1,093 | New | +$11K | |||
| $11K | 0% | 5,638 +5,519 | +4,638% | +$10.8K | |||
| $11K | 0% | 9,070 +6,184 | +214% | +$7.5K | |||
| $11K | 0% | 1,275 -206 | -14% | -$1.78K | |||
| $11K | 0% | 742 | New | +$11K | |||
| $11K | 0% | 3,902 | New | +$11K | |||
| $11K | 0% | 167 -137 | -45% | -$9.02K | |||
| $11K | 0% | 157 -9,817 | -98% | -$688K |
