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 | |
|---|---|---|---|---|---|---|---|
| $7K | ﹤0.01% | 1,074 +139 | +15% | +$906 | |||
| $7K | ﹤0.01% | +404 | New | +$7K | |||
| $7K | ﹤0.01% | 1,648 +720 | +78% | +$3.06K | |||
| $7K | ﹤0.01% | +388 | New | +$7K | |||
| $7K | ﹤0.01% | +250 | New | +$7K | |||
| $6K | ﹤0.01% | 1,053 -6,027 | -85% | -$34.3K | |||
| $6K | ﹤0.01% | +100 | New | +$6K | |||
| $6K | ﹤0.01% | 186 -284 | -60% | -$9.16K | |||
| $6K | ﹤0.01% | +61 | New | +$6K | |||
| $6K | ﹤0.01% | 144 +19 | +15% | +$792 | |||
| $6K | ﹤0.01% | +426 | New | +$6K | |||
| $6K | ﹤0.01% | +1,563 | New | +$6K | |||
| $6K | ﹤0.01% | 22 -1,010 | -98% | -$275K | |||
| $6K | ﹤0.01% | +204 | New | +$6K | |||
| $6K | ﹤0.01% | 472 -8,214 | -95% | -$104K | |||
| $6K | ﹤0.01% | +120 | New | +$6K | |||
| $6K | ﹤0.01% | 8,813 -105,440 | -92% | -$71.8K | |||
| $6K | ﹤0.01% | 893 -626 | -41% | -$4.21K | |||
| $6K | ﹤0.01% | 6,081 +5,326 | +705% | +$5.26K | |||
| $6K | ﹤0.01% | 394 +205 | +108% | +$3.12K | |||
| $6K | ﹤0.01% | 163 -130 | -44% | -$4.79K | |||
| $6K | ﹤0.01% | 1,355 +1,258 | +1,297% | +$5.57K | |||
| $6K | ﹤0.01% | +5,010 | New | +$6K | |||
| $6K | ﹤0.01% | +412 | New | +$6K | |||
| $6K | ﹤0.01% | +620 | New | +$6K |
