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 | |
|---|---|---|---|---|---|---|---|
| $118K | 0% | 6,686 | New | +$118K | |||
| $118K | 0% | 3,452 -6,078 | -64% | -$208K | |||
| $118K | 0% | 7,530 -4,433 | -37% | -$69.5K | |||
| $118K | 0% | 1,412 | New | +$118K | |||
| $117K | 0% | 4,844 | New | +$117K | |||
| $117K | 0% | 30,019 +357 | +1% | +$1.39K | |||
| $117K | 0% | 7,307 +2,789 | +62% | +$44.7K | |||
| $116K | 0% | 626 | New | +$116K | |||
| $116K | 0% | 18,732 | New | +$116K | |||
| $116K | 0% | 75,179 +37,286 | +98% | +$57.5K | |||
| $115K | 0% | 104,884 +89,744 | +593% | +$98.4K | |||
| $114K | 0% | 53,762 -193,121 | -78% | -$410K | |||
| $114K | 0% | 43,405 | New | +$114K | |||
| $114K | 0% | 3,481 | New | +$114K | |||
| $114K | 0% | 716 | New | +$114K | |||
| $114K | 0% | 36,042 +6,607 | +22% | +$20.9K | |||
| $113K | 0% | 16,985 -33,822 | -67% | -$225K | |||
| $113K | 0% | 35,202 | New | +$113K | |||
| $113K | 0% | 8,412 | New | +$113K | |||
| $111K | 0% | 2,055 +602 | +41% | +$32.5K | |||
| $111K | 0% | 18,057 | New | +$111K | |||
| $110K | 0% | 1,387 | New | +$110K | |||
| $109K | 0% | 1,184 | New | +$109K | |||
| $109K | 0% | 504 | New | +$109K | |||
| $109K | 0% | 1,409 -9,035 | -87% | -$699K |
