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 | |
|---|---|---|---|---|---|---|---|
| $0 | ﹤0.01% | 3 -12 | -80% | – | |||
| – | – | -386 | Closed | -$43K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| $0 | ﹤0.01% | 1 -567 | -100% | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -102,022 | Closed | -$467K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -27 | Closed | – | |||
| – | – | 0 | – | – | |||
| $0 | ﹤0.01% | 1 -179 | -99% | – | |||
| – | – | 0 | – | – | |||
| – | – | -24,796 | Closed | -$6K | |||
| – | – | -2,456 | Closed | -$41K | |||
| – | – | -34,533 | Closed | -$378K | |||
| – | – | 0 | – | – | |||
| – | – | -590 | Closed | -$8K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -712 | Closed | -$1K |
