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 | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $7.01M | 0% | 55,440 | New | +$7.01M | |||
| $6.94M | 0% | 483,943 +114,123 | +31% | +$1.64M | |||
| $6.75M | 0% | 8,483 | New | +$6.75M | |||
| $6.69M | 0% | 165,479 +138,670 | +517% | +$5.6M | |||
| $6.66M | 0% | 775,806 +359,571 | +86% | +$3.09M | |||
| $6.54M | 0% | 93,219 +32,650 | +54% | +$2.29M | |||
| $6.53M | 0% | 245,737 | New | +$6.53M | |||
| $6.52M | 0% | 164,639 +157,240 | +2,125% | +$6.23M | |||
| $6.52M | 0% | 62,532 | New | +$6.52M | |||
| $6.45M | 0% | 65,891 -55,657 | -46% | -$5.45M | |||
| $6.41M | 0% | 416,763 | New | +$6.41M | |||
| $6.2M | 0% | 31,247 | New | +$6.2M | |||
| $6.19M | 0% | 71,945 -28,930 | -29% | -$2.49M | |||
| $6.02M | 0% | 109,665 +105,820 | +2,752% | +$5.81M | |||
| $5.88M | 0% | 145,433 +67,965 | +88% | +$2.75M | |||
| $5.8M | 0% | 65,878 | New | +$5.8M | |||
| $5.67M | 0% | 32,279 +24,060 | +293% | +$4.23M | |||
| $5.59M | 0% | 105,468 +38,478 | +57% | +$2.04M | |||
| $5.42M | 0% | 191,230 +87,027 | +84% | +$2.47M | |||
| $5.38M | 0% | 432,137 -236,133 | -35% | -$2.94M | |||
| $5.16M | 0% | 58,815 +32,629 | +125% | +$2.86M | |||
| $5.06M | 0% | 346,780 +270,812 | +356% | +$3.95M | |||
| $5.05M | 0% | 478,235 +226,224 | +90% | +$2.39M | |||
| $5.02M | 0% | 524,407 +421,009 | +407% | +$4.03M | |||
| $5M | 0% | 60,840 +208 | +0.3% | +$17.1K |
