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 | |
|---|---|---|---|---|---|---|---|
| $54K | 0% | 6,351 -11,482 | -64% | -$97.6K | |||
| $54K | 0% | 1,840 | New | +$54K | |||
| $54K | 0% | 1,259 -4,942 | -80% | -$212K | |||
| $53K | 0% | 6,894 +3,790 | +122% | +$29.1K | |||
| $53K | 0% | 8,278 +3,294 | +66% | +$21.1K | |||
| $53K | 0% | 4,159 | New | +$53K | |||
| $53K | 0% | 2,493 | New | +$53K | |||
| $52K | 0% | 237 | New | +$52K | |||
| $52K | 0% | 2,316 | New | +$52K | |||
| $52K | 0% | 19,113 -21,452 | -53% | -$58.4K | |||
| $52K | 0% | 765 | New | +$52K | |||
| $52K | 0% | 3,614 +3,117 | +627% | +$44.8K | |||
| $52K | 0% | 15,371 | New | +$52K | |||
| $52K | 0% | 5,552 | New | +$52K | |||
| $52K | 0% | 23,766 +11,520 | +94% | +$25.2K | |||
| $52K | 0% | 367 -32 | -8% | -$4.53K | |||
| $52K | 0% | 5,672 +5,662 | +56,620% | +$51.9K | |||
| $52K | 0% | 107,600 +57,210 | +114% | +$27.6K | |||
| $52K | 0% | 2,430 -1,700 | -41% | -$36.4K | |||
| $51K | 0% | 1,736 | New | +$51K | |||
| $51K | 0% | 1,965 | New | +$51K | |||
| $51K | 0% | 951 | New | +$51K | |||
| $51K | 0% | 2,528 +1,454 | +135% | +$29.3K | |||
| $51K | 0% | 42,909 -263,860 | -86% | -$314K | |||
| $51K | 0% | 12,765 -9,589 | -43% | -$38.3K |
