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 | |
|---|---|---|---|---|---|---|---|
| $2.55M | 0% | 101,151 +49,864 | +97% | +$1.26M | |||
| $2.54M | 0% | 481,048 +217,676 | +83% | +$1.15M | |||
| $2.54M | 0% | 33,882 | New | +$2.54M | |||
| $2.54M | 0% | 138,514 | New | +$2.54M | |||
| $2.54M | 0% | 25,331 +22,915 | +948% | +$2.29M | |||
| $2.51M | 0% | 120,199 -61,660 | -34% | -$1.29M | |||
| $2.5M | 0% | 122,809 +21,086 | +21% | +$429K | |||
| $2.43M | 0% | 62,268 | New | +$2.43M | |||
| $2.4M | 0% | 19,430 +18,194 | +1,472% | +$2.25M | |||
| $2.38M | 0% | 37,840 | New | +$2.38M | |||
| $2.32M | 0% | 6,291 +5,953 | +1,761% | +$2.19M | |||
| $2.31M | 0% | 10,094 | New | +$2.31M | |||
| $2.31M | 0% | 33,813 -22,874 | -40% | -$1.56M | |||
| $2.31M | 0% | 45,192 +45,100 | +49,022% | +$2.3M | |||
| $2.26M | 0% | 107,543 +17,632 | +20% | +$371K | |||
| $2.26M | 0% | 30,560 -31,322 | -51% | -$2.31M | |||
| $2.25M | 0% | 29,006 | New | +$2.25M | |||
| $2.25M | 0% | 6,080 | New | +$2.25M | |||
| $2.24M | 0% | 88,479 -73,491 | -45% | -$1.86M | |||
| $2.24M | 0% | 23,884 | New | +$2.24M | |||
| $2.23M | 0% | 86,347 -227,352 | -72% | -$5.88M | |||
| $2.23M | 0% | 113,180 -112,721 | -50% | -$2.22M | |||
| $2.21M | 0% | 45,130 +37,233 | +471% | +$1.82M | |||
| $2.2M | 0% | 11,261 -1,576 | -12% | -$308K | |||
| $2.17M | 0% | 65,235 | New | +$2.17M |
