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 | |
|---|---|---|---|---|---|---|---|
| $15K | ﹤0.01% | 47 -187 | -80% | -$59.7K | |||
| $15K | ﹤0.01% | +898 | New | +$15K | |||
| $15K | ﹤0.01% | 8,498 +3,692 | +77% | +$6.52K | |||
| $15K | ﹤0.01% | 1,296 -387 | -23% | -$4.48K | |||
| $15K | ﹤0.01% | +557 | New | +$15K | |||
| $15K | ﹤0.01% | +45 | New | +$15K | |||
| $15K | ﹤0.01% | 1,085 -14,323 | -93% | -$198K | |||
| $15K | ﹤0.01% | 235 +144 | +158% | +$9.19K | |||
| $15K | ﹤0.01% | 1,355 +831 | +159% | +$9.2K | |||
| $15K | ﹤0.01% | 1,661 -2,643 | -61% | -$23.9K | |||
| $15K | ﹤0.01% | 1,598 -1,879 | -54% | -$17.6K | |||
| $15K | ﹤0.01% | 1,296 +914 | +239% | +$10.6K | |||
| $15K | ﹤0.01% | 21,726 -17,387 | -44% | -$12K | |||
| $15K | ﹤0.01% | +2,114 | New | +$15K | |||
| $15K | ﹤0.01% | +1,608 | New | +$15K | |||
| $15K | ﹤0.01% | 13,286 +7,983 | +151% | +$9.01K | |||
| $15K | ﹤0.01% | 2,316 -131 | -5% | -$848 | |||
| $15K | ﹤0.01% | +217 | New | +$15K | |||
| $15K | ﹤0.01% | +16,390 | New | +$15K | |||
| $15K | ﹤0.01% | 352 +256 | +267% | +$10.9K | |||
| $15K | ﹤0.01% | +992 | New | +$15K | |||
| $14K | ﹤0.01% | 6,038 -24,586 | -80% | -$57K | |||
| $14K | ﹤0.01% | +206 | New | +$14K | |||
| $14K | ﹤0.01% | 6,720 +5,872 | +692% | +$12.2K | |||
| $14K | ﹤0.01% | 318 +240 | +308% | +$10.6K |
