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 | |
|---|---|---|---|---|---|---|---|
| $189K | 0% | 36,309 -4,433 | -11% | -$23.1K | |||
| $188K | 0% | 12,981 -12,484 | -49% | -$181K | |||
| $187K | 0% | 5,805 +390 | +7% | +$12.6K | |||
| $187K | 0% | 3,211 +1,690 | +111% | +$98.4K | |||
| $187K | 0% | 10,484 | New | +$187K | |||
| $186K | 0% | 83,726 +45,973 | +122% | +$102K | |||
| $186K | 0% | 38,557 | New | +$186K | |||
| $185K | 0% | 942 | New | +$185K | |||
| $185K | 0% | 9,989 -4,223 | -30% | -$78.2K | |||
| $185K | 0% | 3,186 +2,199 | +223% | +$128K | |||
| $185K | 0% | 14,783 | New | +$185K | |||
| $185K | 0% | 37,822 +29,793 | +371% | +$146K | |||
| $184K | 0% | 16,117 -6,339 | -28% | -$72.4K | |||
| $183K | 0% | 1,499 | New | +$183K | |||
| $182K | 0% | 146,897 | New | +$182K | |||
| $182K | 0% | 27,716 -38,227 | -58% | -$251K | |||
| $180K | 0% | 5,880 +5,865 | +39,100% | +$180K | |||
| $180K | 0% | 23,141 -170 | -0.7% | -$1.32K | |||
| $179K | 0% | 3,840 | New | +$179K | |||
| $178K | 0% | 411 -191 | -32% | -$82.7K | |||
| $178K | 0% | 27,889 +20,616 | +283% | +$132K | |||
| $177K | 0% | 17,171 +12,107 | +239% | +$125K | |||
| $177K | 0% | 134,412 +122,318 | +1,011% | +$161K | |||
| $177K | 0% | 28,762 +13,310 | +86% | +$81.9K | |||
| $176K | 0% | 559 | New | +$176K |
