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 | $49M | |
| 4 | $48.1M | |
| 5 | $41.8M |
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 | |
|---|---|---|---|---|---|---|---|
| $2.93M | ﹤0.01% | 261,541 -166,440 | -39% | -$1.87M | |||
| $2.93M | ﹤0.01% | 74,282 +56,464 | +317% | +$2.23M | |||
| $2.93M | ﹤0.01% | 80,305 -34,544 | -30% | -$1.26M | |||
| $2.89M | ﹤0.01% | +24,414 | New | +$2.89M | |||
| $2.87M | ﹤0.01% | 39,322 -573,536 | -94% | -$41.8M | |||
| $2.85M | ﹤0.01% | 73,740 -136,696 | -65% | -$5.28M | |||
| $2.85M | ﹤0.01% | 204,709 -17,344 | -8% | -$241K | |||
| $2.79M | ﹤0.01% | 190,786 +172,119 | +922% | +$2.52M | |||
| $2.79M | ﹤0.01% | 111,524 +43,980 | +65% | +$1.1M | |||
| $2.78M | ﹤0.01% | 341,988 +267,257 | +358% | +$2.17M | |||
| $2.77M | ﹤0.01% | 443,647 +262,106 | +144% | +$1.64M | |||
| $2.77M | ﹤0.01% | 43,503 +11,668 | +37% | +$742K | |||
| $2.71M | ﹤0.01% | +18,626 | New | +$2.71M | |||
| $2.7M | ﹤0.01% | +75,398 | New | +$2.7M | |||
| $2.7M | ﹤0.01% | +596,018 | New | +$2.7M | |||
| $2.68M | ﹤0.01% | 240,150 -770,749 | -76% | -$8.61M | |||
| $2.67M | ﹤0.01% | 74,477 +47,401 | +175% | +$1.7M | |||
| $2.67M | ﹤0.01% | +85,013 | New | +$2.67M | |||
| $2.65M | ﹤0.01% | 122,431 +110,693 | +943% | +$2.39M | |||
| $2.61M | ﹤0.01% | 627,249 -276,694 | -31% | -$1.15M | |||
| $2.6M | ﹤0.01% | +183,055 | New | +$2.6M | |||
| $2.59M | ﹤0.01% | 272,379 -192,755 | -41% | -$1.83M | |||
| $2.59M | ﹤0.01% | 160,319 -3,289 | -2% | -$53.1K | |||
| $2.57M | ﹤0.01% | 110,128 -31,308 | -22% | -$731K | |||
| $2.56M | ﹤0.01% | 180,714 +105,199 | +139% | +$1.49M |
