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 | $49M | |
| 4 | $48.1M | |
| 5 | $41.8M |
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 | |
|---|---|---|---|---|---|---|---|
| – | – | -5,229 | Closed | -$467K | |||
| – | – | 0 | – | – | |||
| – | – | -1,097 | Closed | -$43K | |||
| – | – | -8,632 | Closed | -$710K | |||
| – | – | -3,595 | Closed | -$4K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| $0 | ﹤0.01% | 686 -3,402 | -83% | – | |||
| – | – | -15,382 | Closed | -$1.64M | |||
| $0 | ﹤0.01% | 23 -1,021 | -98% | – | |||
| – | – | 0 | – | – | |||
| $0 | ﹤0.01% | +264 | New | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -83 | Closed | -$14K | |||
| – | – | -23,468 | Closed | -$111K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -2,386 | Closed | -$80K | |||
| – | – | -29 | Closed | -$1K | |||
| $0 | ﹤0.01% | 178 -1,059 | -86% | – | |||
| – | – | 0 | – | – | |||
| $0 | ﹤0.01% | 97 -9,367 | -99% | – | |||
| – | – | 0 | – | – |
