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 | |
|---|---|---|---|---|---|---|---|
| $65K | 0% | 908 | New | +$65K | |||
| $64K | 0% | 1,365 | New | +$64K | |||
| $64K | 0% | 45,129 -9,256 | -17% | -$13.1K | |||
| $64K | 0% | 21,657 +4,441 | +26% | +$13.1K | |||
| $63K | 0% | 2,513 | New | +$63K | |||
| $63K | 0% | 13,292 -3,806 | -22% | -$18K | |||
| $63K | 0% | 2,958 +1,000 | +51% | +$21.3K | |||
| $63K | 0% | 1,670 | New | +$63K | |||
| $63K | 0% | 1,331 +1,284 | +2,732% | +$60.8K | |||
| $62K | 0% | 807 -139 | -15% | -$10.7K | |||
| $62K | 0% | 9,933 +6,889 | +226% | +$43K | |||
| $62K | 0% | 14,933 +11,284 | +309% | +$46.9K | |||
| $62K | 0% | 12,646 +8,679 | +219% | +$42.6K | |||
| $62K | 0% | 1,809 | New | +$62K | |||
| $62K | 0% | 400 +398 | +19,900% | +$61.7K | |||
| $61K | 0% | 4,793 | New | +$61K | |||
| $61K | 0% | 14,325 -6,290 | -31% | -$26.8K | |||
| $61K | 0% | 871 | New | +$61K | |||
| $61K | 0% | 8,419 | New | +$61K | |||
| $60K | 0% | 18,158 | New | +$60K | |||
| $60K | 0% | 9,497 -11,486 | -55% | -$72.6K | |||
| $60K | 0% | 2,267 | New | +$60K | |||
| $60K | 0% | 38,580 +10,741 | +39% | +$16.7K | |||
| $59K | 0% | 394 -1,625 | -80% | -$243K | |||
| $59K | 0% | 23,827 -43,255 | -64% | -$107K |
