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 | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $0 | 0% | 0 -540 | Closed | – | |||
| $0 | 0% | 0 -3,421 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 -629,246 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 -14,164 | Closed | – | |||
| $0 | 0% | 0 -575 | Closed | – | |||
| $0 | 0% | 0 -73 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 11 | New | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 -6,320 | Closed | – | |||
| $0 | 0% | 0 -1,896 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 0 -158,536 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 2 -1,683 | -100% | – | |||
| $0 | 0% | 0 -3,381 | Closed | – | |||
| $0 | 0% | 0 -2,729 | Closed | – | |||
| $0 | 0% | 0 -24,756 | Closed | – | |||
| $0 | 0% | 0 | – | – | |||
| $0 | 0% | 18 -907 | -98% | – | |||
| $0 | 0% | 0 | – | – |
