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 | |
|---|---|---|---|---|---|---|---|
| $2.17M | 0% | 36,922 +36,174 | +4,836% | +$2.12M | |||
| $2.14M | 0% | 4,567 -401 | -8% | -$188K | |||
| $2.14M | 0% | 37,320 | New | +$2.14M | |||
| $2.12M | 0% | 19,392 | New | +$2.12M | |||
| $2.11M | 0% | 245,149 -13,984 | -5% | -$121K | |||
| $2.11M | 0% | 17,120 +5,721 | +50% | +$706K | |||
| $2.06M | 0% | 26,750 +19,500 | +269% | +$1.5M | |||
| $2.05M | 0% | 46,435 +38,020 | +452% | +$1.68M | |||
| $2.05M | 0% | 204,622 +81,124 | +66% | +$811K | |||
| $2M | 0% | 24,037 +831 | +4% | +$69.3K | |||
| $2M | 0% | 96,265 +93,940 | +4,040% | +$1.95M | |||
| $2M | 0% | 25,214 | New | +$2M | |||
| $1.99M | 0% | 158,286 -130,809 | -45% | -$1.64M | |||
| $1.99M | 0% | 12,508 | New | +$1.99M | |||
| $1.97M | 0% | 196,978 -1,081,062 | -85% | -$10.8M | |||
| $1.96M | 0% | 17,582 | New | +$1.96M | |||
| $1.95M | 0% | 64,581 | New | +$1.95M | |||
| $1.94M | 0% | 260,354 +235,960 | +967% | +$1.76M | |||
| $1.93M | 0% | 6,324 +2,914 | +85% | +$889K | |||
| $1.93M | 0% | 19,523 +5,793 | +42% | +$571K | |||
| $1.92M | 0% | 7,868 -5,612 | -42% | -$1.37M | |||
| $1.92M | 0% | 9,259 | New | +$1.92M | |||
| $1.91M | 0% | 27,201 +25,940 | +2,057% | +$1.83M | |||
| $1.91M | 0% | 9,275 | New | +$1.91M | |||
| $1.91M | 0% | 44,058 | New | +$1.91M |
