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 | |
|---|---|---|---|---|---|---|---|
| $51K | 0% | 1,791 +1,700 | +1,868% | +$48.4K | |||
| $50K | 0% | 9,783 | New | +$50K | |||
| $50K | 0% | 11,039 -3,468 | -24% | -$15.7K | |||
| $50K | 0% | 2,258 | New | +$50K | |||
| $50K | 0% | 669 +384 | +135% | +$28.7K | |||
| $49K | 0% | 2,396 -10,132 | -81% | -$207K | |||
| $49K | 0% | 1,659 +894 | +117% | +$26.4K | |||
| $49K | 0% | 3,899 +3,459 | +786% | +$43.5K | |||
| $49K | 0% | 420 | New | +$49K | |||
| $49K | 0% | 936 | New | +$49K | |||
| $49K | 0% | 778 | New | +$49K | |||
| $49K | 0% | 4,168 +3,081 | +283% | +$36.2K | |||
| $48K | 0% | 2,073 +1,638 | +377% | +$37.9K | |||
| $48K | 0% | 19,950 -147,916 | -88% | -$356K | |||
| $48K | 0% | 45,687 -21,383 | -32% | -$22.5K | |||
| $48K | 0% | 11,505 -3,286 | -22% | -$13.7K | |||
| $48K | 0% | 16,591 -45,836 | -73% | -$133K | |||
| $48K | 0% | 2,585 +2,125 | +462% | +$39.5K | |||
| $48K | 0% | 304 | New | +$48K | |||
| $47K | 0% | 11,678 +4,303 | +58% | +$17.3K | |||
| $47K | 0% | 2,232 | New | +$47K | |||
| $47K | 0% | 6,410 +893 | +16% | +$6.55K | |||
| $47K | 0% | 907 +300 | +49% | +$15.5K | |||
| $47K | 0% | 6,294 | New | +$47K | |||
| $47K | 0% | 622 | New | +$47K |
