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 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $3K | 0% | 52 | New | +$3K | |||
| $3K | 0% | 75 | New | +$3K | |||
| $3K | 0% | 104 | New | +$3K | |||
| $3K | 0% | 114 | New | +$3K | |||
| $3K | 0% | 214 -108 | -34% | -$1.51K | |||
| $2K | 0% | 130 | New | +$2K | |||
| $2K | 0% | 2,343 +1,152 | +97% | +$983 | |||
| $2K | 0% | 2,901 -4,130 | -59% | -$2.85K | |||
| $2K | 0% | 125 +19 | +18% | +$304 | |||
| $2K | 0% | 38 -1,307 | -97% | -$68.8K | |||
| $2K | 0% | 1,235 -6,731 | -85% | -$10.9K | |||
| $2K | 0% | 109 | New | +$2K | |||
| $2K | 0% | 1,306 -9,614 | -88% | -$14.7K | |||
| $2K | 0% | 861 | New | +$2K | |||
| $2K | 0% | 4,140 +3,531 | +580% | +$1.71K | |||
| $2K | 0% | 244 -6,338 | -96% | -$52K | |||
| $2K | 0% | 156 | New | +$2K | |||
| $2K | 0% | 46 | New | +$2K | |||
| $2K | 0% | 100 | New | +$2K | |||
| $2K | 0% | 34 | New | +$2K | |||
| $2K | 0% | 116 +67 | +137% | +$1.16K | |||
| $2K | 0% | 48 -229 | -83% | -$9.54K | |||
| $2K | 0% | 77 | New | +$2K | |||
| $2K | 0% | 147 | New | +$2K | |||
| $2K | 0% | 130 | New | +$2K |
