Frederick Gerald Cloppert

Citadel Securities LLC is a registered market maker headquartered in Chicago, Illinois. The firm was founded by Kenneth Griffin in 2001 and is a subsidiary of GFH HFEVA LLC. Citadel Securities provides execution services to meet the liquidity needs of asset managers, banks, broker-dealers, hedge funds, government agencies, and public pension programs. They offer services across a broad array of fixed income and equity products.

Founded in 1999 by Rob Merrilees, Spot Trading LLC is a technology-focused proprietary trading firm located in Chicago. The firm specializes in investments in equity options. They employ proprietary technology and processes to make volatility-based pricing decisions and to exploit inefficiencies in the equity options markets. To maximize risk-adjusted returns, Spot Trading's proprietary trading model uses automation, qualitative analysis, quantitative analysis and sound risk management principles.