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 | 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 | |
|---|---|---|---|---|---|---|---|
| $2K | 0% | 150 -665 | -82% | -$8.87K | |||
| $2K | 0% | 129 -514 | -80% | -$7.97K | |||
| $2K | 0% | 40 -32 | -44% | -$1.6K | |||
| $1K | 0% | 1,855 -12,620 | -87% | -$6.8K | |||
| $1K | 0% | 8,016 -128,832 | -94% | -$16.1K | |||
| $1K | 0% | 48 | New | +$1K | |||
| $1K | 0% | 53 -1,457 | -96% | -$27.5K | |||
| $1K | 0% | 1,905 +542 | +40% | +$285 | |||
| $1K | 0% | 19 | New | +$1K | |||
| $1K | 0% | 857 -11,598 | -93% | -$13.5K | |||
| $1K | 0% | 904 -482 | -35% | -$533 | |||
| $1K | 0% | 153 +142 | +1,291% | +$928 | |||
| $1K | 0% | 91 | New | +$1K | |||
| $1K | 0% | 1,348 | New | +$1K | |||
| $1K | 0% | 39 | New | +$1K | |||
| $1K | 0% | 2,044 | New | +$1K | |||
| $1K | 0% | 456 +52 | +13% | +$114 | |||
| $1K | 0% | 848 -1,483 | -64% | -$1.75K | |||
| $1K | 0% | 97 -2,967 | -97% | -$30.6K | |||
| $1K | 0% | 966 -754 | -44% | -$781 | |||
| $1K | 0% | 374 | New | +$1K | |||
| $1K | 0% | 263 -4,905 | -95% | -$18.7K | |||
| $1K | 0% | 43 | New | +$1K | |||
| $1K | 0% | 57 | New | +$1K | |||
| $1K | 0% | 1,063 -2,303 | -68% | -$2.17K |
