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 | |
|---|---|---|---|---|---|---|---|
| $24K | ﹤0.01% | +1,500 | New | +$24K | |||
| $24K | ﹤0.01% | 4,209 -10,654 | -72% | -$60.8K | |||
| $24K | ﹤0.01% | +3,113 | New | +$24K | |||
| $24K | ﹤0.01% | +1,790 | New | +$24K | |||
| $24K | ﹤0.01% | +3,772 | New | +$24K | |||
| $24K | ﹤0.01% | +6,049 | New | +$24K | |||
| $24K | ﹤0.01% | +2,158 | New | +$24K | |||
| $24K | ﹤0.01% | +829 | New | +$24K | |||
| $23K | ﹤0.01% | 2,582 -50,009 | -95% | -$445K | |||
| $23K | ﹤0.01% | 5,486 -6,192 | -53% | -$26K | |||
| $23K | ﹤0.01% | +308 | New | +$23K | |||
| $23K | ﹤0.01% | 1,498 -164 | -10% | -$2.52K | |||
| $23K | ﹤0.01% | +6,457 | New | +$23K | |||
| $23K | ﹤0.01% | +800 | New | +$23K | |||
| $23K | ﹤0.01% | 201 +169 | +528% | +$19.3K | |||
| $23K | ﹤0.01% | 156 +82 | +111% | +$12.1K | |||
| $23K | ﹤0.01% | +693 | New | +$23K | |||
| $23K | ﹤0.01% | 2,246 -834 | -27% | -$8.54K | |||
| $23K | ﹤0.01% | 340 -163 | -32% | -$11K | |||
| $23K | ﹤0.01% | +827 | New | +$23K | |||
| $22K | ﹤0.01% | 1,176 +524 | +80% | +$9.8K | |||
| $22K | ﹤0.01% | +781 | New | +$22K | |||
| $22K | ﹤0.01% | 1,360 -308 | -18% | -$4.98K | |||
| $22K | ﹤0.01% | 1,725 -12,490 | -88% | -$159K | |||
| $22K | ﹤0.01% | 220 -909 | -81% | -$90.9K |
