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 | |
|---|---|---|---|---|---|---|---|
| $17K | ﹤0.01% | 1,675 -9,564 | -85% | -$97.1K | |||
| $17K | ﹤0.01% | 1,970 +670 | +52% | +$5.78K | |||
| $17K | ﹤0.01% | 578 -396 | -41% | -$11.6K | |||
| $17K | ﹤0.01% | 590 +381 | +182% | +$11K | |||
| $17K | ﹤0.01% | +1,114 | New | +$17K | |||
| $17K | ﹤0.01% | +324 | New | +$17K | |||
| $16K | ﹤0.01% | +6,673 | New | +$16K | |||
| $16K | ﹤0.01% | 8,747 +5,686 | +186% | +$10.4K | |||
| $16K | ﹤0.01% | +218 | New | +$16K | |||
| $16K | ﹤0.01% | 1,199 +778 | +185% | +$10.4K | |||
| $16K | ﹤0.01% | +586 | New | +$16K | |||
| $16K | ﹤0.01% | 5,181 +2,987 | +136% | +$9.22K | |||
| $16K | ﹤0.01% | 1,113 -200 | -15% | -$2.88K | |||
| $16K | ﹤0.01% | 618 -2,622 | -81% | -$67.9K | |||
| $16K | ﹤0.01% | +415 | New | +$16K | |||
| $16K | ﹤0.01% | 138 -862 | -86% | -$99.9K | |||
| $16K | ﹤0.01% | 1,062 +676 | +175% | +$10.2K | |||
| $16K | ﹤0.01% | 98 -2,240 | -96% | -$366K | |||
| $16K | ﹤0.01% | +248 | New | +$16K | |||
| $16K | ﹤0.01% | +196 | New | +$16K | |||
| $16K | ﹤0.01% | 221 -5,013 | -96% | -$363K | |||
| $16K | ﹤0.01% | 1,917 +1,786 | +1,363% | +$14.9K | |||
| $16K | ﹤0.01% | 2,564 -617 | -19% | -$3.85K | |||
| $16K | ﹤0.01% | 436 +374 | +603% | +$13.7K | |||
| $16K | ﹤0.01% | 111 -4,487 | -98% | -$647K |
