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 | +$77.3M | |
| 2 | +$73.2M | |
| 3 | +$38.5M | |
| 4 |
Netflix
NFLX
|
+$38.4M |
| 5 |
NVIDIA
NVDA
|
+$36.3M |
Top Sells
| 1 | +$55.9M | |
| 2 | +$28.3M | |
| 3 | +$23.1M | |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$23.1M |
| 5 |
Adobe
ADBE
|
+$22M |
Sector Composition
| 1 | Technology | 15.19% |
| 2 | Consumer Discretionary | 14.52% |
| 3 | Communication Services | 10.57% |
| 4 | Healthcare | 8.14% |
| 5 | Financials | 7.16% |