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 | |
|---|---|---|---|---|---|---|---|
| $147K | 0% | 33,903 | New | +$147K | |||
| $146K | 0% | 1,687 +1,210 | +254% | +$105K | |||
| $146K | 0% | 54,482 +25,675 | +89% | +$68.8K | |||
| $146K | 0% | 11,239 | New | +$146K | |||
| $146K | 0% | 6,130 -10,381 | -63% | -$247K | |||
| $145K | 0% | 10,265 | New | +$145K | |||
| $145K | 0% | 2,149 +1,186 | +123% | +$80K | |||
| $145K | 0% | 3,832 | New | +$145K | |||
| $145K | 0% | 43,104 -9,948 | -19% | -$33.5K | |||
| $145K | 0% | 86,188 +5,268 | +7% | +$8.86K | |||
| $145K | 0% | 4,550 | New | +$145K | |||
| $144K | 0% | 2,686 +2,579 | +2,410% | +$138K | |||
| $144K | 0% | 10,513 +5,965 | +131% | +$81.7K | |||
| $142K | 0% | 4,556 | New | +$142K | |||
| $142K | 0% | 7,626 | New | +$142K | |||
| $141K | 0% | 81,858 | New | +$141K | |||
| $141K | 0% | 42,564 -27,889 | -40% | -$92.4K | |||
| $141K | 0% | 13,989 -19,013 | -58% | -$192K | |||
| $141K | 0% | 2,199 +1,065 | +94% | +$68.3K | |||
| $140K | 0% | 10,596 +1,326 | +14% | +$17.5K | |||
| $140K | 0% | 22,474 +17,079 | +317% | +$106K | |||
| $139K | 0% | 22,364 | New | +$139K | |||
| $139K | 0% | 1,112 | New | +$139K | |||
| $139K | 0% | 48,651 | New | +$139K | |||
| $139K | 0% | 11,598 +9,920 | +591% | +$119K |
