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 | |
|---|---|---|---|---|---|---|---|
| $265K | 0% | 2,400 | New | +$265K | |||
| $264K | 0% | 2,393 | New | +$264K | |||
| $264K | 0% | 229,879 | New | +$264K | |||
| $264K | 0% | 5,234 -2,038 | -28% | -$103K | |||
| $263K | 0% | 2,912 | New | +$263K | |||
| $263K | 0% | 11,750 | New | +$263K | |||
| $262K | 0% | 9,153 | New | +$262K | |||
| $262K | 0% | 19,487 | New | +$262K | |||
| $259K | 0% | 53,134 | New | +$259K | |||
| $259K | 0% | 2,958 -21,774 | -88% | -$1.91M | |||
| $257K | 0% | 28,094 -8,882 | -24% | -$81.3K | |||
| $255K | 0% | 19,956 +16,549 | +486% | +$211K | |||
| $255K | 0% | 31,012 +2,017 | +7% | +$16.6K | |||
| $254K | 0% | 2,537 +228 | +10% | +$22.8K | |||
| $254K | 0% | 2,451 +2,113 | +625% | +$219K | |||
| $252K | 0% | 8,170 | New | +$252K | |||
| $252K | 0% | 13,577 +7,737 | +132% | +$144K | |||
| $251K | 0% | 21,991 -20,161 | -48% | -$230K | |||
| $249K | 0% | 27,256 | New | +$249K | |||
| $249K | 0% | 5,546 +2,383 | +75% | +$107K | |||
| $248K | 0% | 33,149 | New | +$248K | |||
| $246K | 0% | 32,491 | New | +$246K | |||
| $246K | 0% | 4,895 +2,177 | +80% | +$109K | |||
| $245K | 0% | 13,508 -7,704 | -36% | -$140K | |||
| $243K | 0% | 1,813 | New | +$243K |
