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 | +$17.7M | |
| 2 | +$10.1M | |
| 3 | +$7.66M | |
| 4 |
Alibaba
BABA
|
+$7.54M |
| 5 |
Micron Technology
MU
|
+$6.73M |
Top Sells
| 1 | +$101M | |
| 2 | +$15.2M | |
| 3 | +$9.5M | |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$8.76M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.41M |
Sector Composition
| 1 | Technology | 18.51% |
| 2 | Consumer Discretionary | 14.92% |
| 3 | Communication Services | 10.29% |
| 4 | Healthcare | 9.69% |
| 5 | Financials | 9.65% |