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 | |
|---|---|---|---|---|---|---|---|
| – | – | -100 | Closed | -$3K | |||
| – | – | -54,922 | Closed | -$398K | |||
| – | – | 0 | – | – | |||
| – | – | -12,290 | Closed | -$519K | |||
| – | – | -100 | Closed | -$6K | |||
| – | – | -5,497 | Closed | -$26K | |||
| – | – | -200 | Closed | -$2K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -4,186 | Closed | -$96K | |||
| – | – | 0 | – | – | |||
| – | – | -1,291 | Closed | -$2K | |||
| – | – | -5,235 | Closed | -$42K | |||
| – | – | 0 | – | – | |||
| – | – | -3,806 | Closed | -$86K | |||
| – | – | -15,532 | Closed | -$871K | |||
| $0 | ﹤0.01% | 3 -1,474 | -100% | – | |||
| – | – | -16,956 | Closed | -$972K | |||
| – | – | -45,680 | Closed | -$54K | |||
| – | – | 0 | – | – | |||
| – | – | 0 | – | – | |||
| – | – | -314,070 | Closed | -$10.7M | |||
| – | – | -45,393 | Closed | -$1.94M | |||
| $0 | ﹤0.01% | 13 -5,026 | -100% | – | |||
| – | – | -36,453 | Closed | -$6.08M |
