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 | 34.86% |
| 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 | |
|---|---|---|---|---|---|---|---|
| $8K | ﹤0.01% | 328 -735 | -69% | -$17.9K | |||
| $8K | ﹤0.01% | +400 | New | +$8K | |||
| $7K | ﹤0.01% | +409 | New | +$7K | |||
| $7K | ﹤0.01% | +848 | New | +$7K | |||
| $7K | ﹤0.01% | 256 -482 | -65% | -$13.2K | |||
| $7K | ﹤0.01% | 5,730 -5,499 | -49% | -$6.72K | |||
| $7K | ﹤0.01% | +356 | New | +$7K | |||
| $7K | ﹤0.01% | 342 -566 | -62% | -$11.6K | |||
| $7K | ﹤0.01% | 5,455 -23,512 | -81% | -$30.2K | |||
| $7K | ﹤0.01% | 66 +65 | +6,500% | +$6.89K | |||
| $7K | ﹤0.01% | 4,870 -78,294 | -94% | -$113K | |||
| $7K | ﹤0.01% | +1,191 | New | +$7K | |||
| $7K | ﹤0.01% | 756 -1,757 | -70% | -$16.3K | |||
| $7K | ﹤0.01% | 6,999 +5,109 | +270% | +$5.11K | |||
| $7K | ﹤0.01% | +164 | New | +$7K | |||
| $7K | ﹤0.01% | 54 | – | – | |||
| $7K | ﹤0.01% | +130 | New | +$7K | |||
| $7K | ﹤0.01% | 483 -175 | -27% | -$2.54K | |||
| $7K | ﹤0.01% | +140 | New | +$7K | |||
| $7K | ﹤0.01% | +612 | New | +$7K | |||
| $7K | ﹤0.01% | +100 | New | +$7K | |||
| $7K | ﹤0.01% | 697 +591 | +558% | +$5.94K | |||
| $7K | ﹤0.01% | +380 | New | +$7K | |||
| $7K | ﹤0.01% | +140 | New | +$7K | |||
| $7K | ﹤0.01% | +3,263 | New | +$7K |
