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 | |
|---|---|---|---|---|---|---|---|
| $109K | 0% | 26,586 +4,712 | +22% | +$19.3K | |||
| $108K | 0% | 13,749 | New | +$108K | |||
| $108K | 0% | 8,369 | New | +$108K | |||
| $107K | 0% | 3,083 -3,218 | -51% | -$112K | |||
| $107K | 0% | 26,246 +23,824 | +984% | +$97.1K | |||
| $106K | 0% | 4,390 -107 | -2% | -$2.58K | |||
| $105K | 0% | 953 | New | +$105K | |||
| $105K | 0% | 4,289 -1,505 | -26% | -$36.8K | |||
| $105K | 0% | 1,391 -980 | -41% | -$74K | |||
| $105K | 0% | 2,634 | New | +$105K | |||
| $104K | 0% | 20,821 -160,351 | -89% | -$801K | |||
| $104K | 0% | 3,240 -4,152 | -56% | -$133K | |||
| $103K | 0% | 26,143 +14,203 | +119% | +$56K | |||
| $103K | 0% | 3,458 -5,075 | -59% | -$151K | |||
| $102K | 0% | 923 -6,476 | -88% | -$716K | |||
| $102K | 0% | 26,830 -1,215,117 | -98% | -$4.62M | |||
| $102K | 0% | 2,692 | New | +$102K | |||
| $101K | 0% | 11,660 +10,845 | +1,331% | +$93.9K | |||
| $101K | 0% | 12,890 +11,299 | +710% | +$88.5K | |||
| $101K | 0% | 18,886 +18,717 | +11,075% | +$100K | |||
| $101K | 0% | 12,114 | New | +$101K | |||
| $101K | 0% | 4,598 | New | +$101K | |||
| $100K | 0% | 7,491 | New | +$100K | |||
| $100K | 0% | 34,003 | New | +$100K | |||
| $100K | 0% | 12,695 -10,326 | -45% | -$81.3K |
