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 | $216M | |
| 2 | $159M | |
| 3 | $128M | |
| 4 | $62.2M | |
| 5 | $61.9M |
Top Sells
| 1 | $141M | |
| 2 | $53.1M | |
| 3 | $45.7M | |
| 4 | $45.3M | |
| 5 | $38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $44K | ﹤0.01% | 3,235 +2,498 | +339% | +$34K | |||
| $44K | ﹤0.01% | 789 -286,926 | -100% | -$16M | |||
| $43K | ﹤0.01% | 3,320 -429 | -11% | -$5.56K | |||
| $43K | ﹤0.01% | 3,699 -15,786 | -81% | -$184K | |||
| $43K | ﹤0.01% | 6,265 +4,031 | +180% | +$27.7K | |||
| $43K | ﹤0.01% | +1,034 | New | +$43K | |||
| $43K | ﹤0.01% | +1,815 | New | +$43K | |||
| $43K | ﹤0.01% | 280 +111 | +66% | +$17K | |||
| $43K | ﹤0.01% | 896 -13,312 | -94% | -$639K | |||
| $43K | ﹤0.01% | 2,314 +1,796 | +347% | +$33.4K | |||
| $43K | ﹤0.01% | 9,104 -3,864 | -30% | -$18.3K | |||
| $43K | ﹤0.01% | +2,006 | New | +$43K | |||
| $42K | ﹤0.01% | +7,451 | New | +$42K | |||
| $42K | ﹤0.01% | 1,731 -8,661 | -83% | -$210K | |||
| $42K | ﹤0.01% | 38,019 +23,639 | +164% | +$26.1K | |||
| $42K | ﹤0.01% | +3,992 | New | +$42K | |||
| $42K | ﹤0.01% | +386 | New | +$42K | |||
| $42K | ﹤0.01% | +1,345 | New | +$42K | |||
| $42K | ﹤0.01% | 5,200 -60,440 | -92% | -$488K | |||
| $41K | ﹤0.01% | 6,625 +4,235 | +177% | +$26.2K | |||
| $41K | ﹤0.01% | 32,647 +32,389 | +12,554% | +$40.7K | |||
| $41K | ﹤0.01% | 927 -191 | -17% | -$8.45K | |||
| $41K | ﹤0.01% | +2,986 | New | +$41K | |||
| $41K | ﹤0.01% | 54,092 +41,333 | +324% | +$31.3K | |||
| $41K | ﹤0.01% | 1,909 +1,430 | +299% | +$30.7K |
