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 | |
|---|---|---|---|---|---|---|---|
| $2K | 0% | 917 +847 | +1,210% | +$1.85K | |||
| $2K | 0% | 56 -200 | -78% | -$7.14K | |||
| $2K | 0% | 57 | New | +$2K | |||
| $2K | 0% | 40 | New | +$2K | |||
| $2K | 0% | 34 -122 | -78% | -$7.18K | |||
| $2K | 0% | 4,095 -2,584 | -39% | -$1.26K | |||
| $2K | 0% | 66 | New | +$2K | |||
| $2K | 0% | 103 | New | +$2K | |||
| $2K | 0% | 3,229 +2,415 | +297% | +$1.5K | |||
| $2K | 0% | 46 +33 | +254% | +$1.44K | |||
| $2K | 0% | 130 | New | +$2K | |||
| $2K | 0% | 2,957 | New | +$2K | |||
| $2K | 0% | 11 | New | +$2K | |||
| $2K | 0% | 318 | New | +$2K | |||
| $2K | 0% | 101 | New | +$2K | |||
| $2K | 0% | 3,626 -957 | -21% | -$528 | |||
| $2K | 0% | 243 | New | +$2K | |||
| $2K | 0% | 166 | New | +$2K | |||
| $2K | 0% | 994 -7,314 | -88% | -$14.7K | |||
| $2K | 0% | 183 | New | +$2K | |||
| $2K | 0% | 109 -4,534 | -98% | -$83.2K | |||
| $2K | 0% | 61 | New | +$2K | |||
| $2K | 0% | 6,341 +4,755 | +300% | +$1.5K | |||
| $2K | 0% | 126 | – | – | |||
| $2K | 0% | 2,017 +1,518 | +304% | +$1.51K |
