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 | |
|---|---|---|---|---|---|---|---|
| $26K | ﹤0.01% | +529 | New | +$26K | |||
| $26K | ﹤0.01% | 6,505 +871 | +15% | +$3.48K | |||
| $26K | ﹤0.01% | 202 +42 | +26% | +$5.41K | |||
| $25K | ﹤0.01% | 1,061 -1,255 | -54% | -$29.6K | |||
| $25K | ﹤0.01% | +993 | New | +$25K | |||
| $25K | ﹤0.01% | 1,685 +1,432 | +566% | +$21.2K | |||
| $25K | ﹤0.01% | 11,689 -1,534 | -12% | -$3.28K | |||
| $25K | ﹤0.01% | +3,655 | New | +$25K | |||
| $25K | ﹤0.01% | 1,034 +737 | +248% | +$17.8K | |||
| $25K | ﹤0.01% | 2,679 -2,603 | -49% | -$24.3K | |||
| $25K | ﹤0.01% | 2,874 -16,553 | -85% | -$144K | |||
| $25K | ﹤0.01% | 20,836 -4,427 | -18% | -$5.31K | |||
| $25K | ﹤0.01% | 1,711 +866 | +102% | +$12.7K | |||
| $25K | ﹤0.01% | 47,867 +27,590 | +136% | +$14.4K | |||
| $25K | ﹤0.01% | 8,610 -8,012 | -48% | -$23.3K | |||
| $25K | ﹤0.01% | 3,481 +2,961 | +569% | +$21.3K | |||
| $25K | ﹤0.01% | 2,529 -78,374 | -97% | -$775K | |||
| $25K | ﹤0.01% | +256 | New | +$25K | |||
| $25K | ﹤0.01% | 297 +190 | +178% | +$16K | |||
| $25K | ﹤0.01% | 4,969 +4,836 | +3,636% | +$24.3K | |||
| $25K | ﹤0.01% | 5,282 -1,804 | -25% | -$8.54K | |||
| $24K | ﹤0.01% | +2,709 | New | +$24K | |||
| $24K | ﹤0.01% | 11,929 -12,573 | -51% | -$25.3K | |||
| $24K | ﹤0.01% | +455 | New | +$24K | |||
| $24K | ﹤0.01% | 291 -14 | -5% | -$1.16K |
