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 | |
|---|---|---|---|---|---|---|---|
| $2K | ﹤0.01% | +56 | New | +$2K | |||
| $2K | ﹤0.01% | +39 | New | +$2K | |||
| $2K | ﹤0.01% | +954 | New | +$2K | |||
| $2K | ﹤0.01% | +42 | New | +$2K | |||
| $2K | ﹤0.01% | 171 -911 | -84% | -$10.7K | |||
| $2K | ﹤0.01% | 136 -11,467 | -99% | -$169K | |||
| $2K | ﹤0.01% | +350 | New | +$2K | |||
| $2K | ﹤0.01% | +24 | New | +$2K | |||
| $2K | ﹤0.01% | +46 | New | +$2K | |||
| $2K | ﹤0.01% | 5,026 -17,651 | -78% | -$7.02K | |||
| $2K | ﹤0.01% | +100 | New | +$2K | |||
| $2K | ﹤0.01% | 526 -391 | -43% | -$1.49K | |||
| $2K | ﹤0.01% | +1,776 | New | +$2K | |||
| $2K | ﹤0.01% | 117 +14 | +14% | +$239 | |||
| $2K | ﹤0.01% | +159 | New | +$2K | |||
| $2K | ﹤0.01% | +406 | New | +$2K | |||
| $2K | ﹤0.01% | +81 | New | +$2K | |||
| $2K | ﹤0.01% | 132 +129 | +4,300% | +$1.96K | |||
| $2K | ﹤0.01% | +1,021 | New | +$2K | |||
| $2K | ﹤0.01% | 6,275 -8,982 | -59% | -$2.86K | |||
| $2K | ﹤0.01% | 1,114 -13,055 | -92% | -$23.4K | |||
| $2K | ﹤0.01% | 298 -692 | -70% | -$4.64K | |||
| $2K | ﹤0.01% | +80 | New | +$2K | |||
| $2K | ﹤0.01% | 3,636 -2,594 | -42% | -$1.43K | |||
| $2K | ﹤0.01% | 690 +57 | +9% | +$165 |
