Andy David Kolinsky

NYSE Chicago, Inc. offers technology based national securities exchange services. It provides business to transact in all equity securities traded on NYSE, AMEX, NASDAQ, or other national securities exchanges. CHX acts as a venue for hedge funds, options market markers, quantitative, professional and active individual traders that require immediate and automated execution. The firm provides services through its technology products including CHXBD, CHX SHARE and SNAP. The company was founded in 1882 and is headquartered in Chicago, IL.

Citadel Execution Services, Inc. is the broker/dealer affiliate of Citadel Investment Group. The firm is located in Chicago, Illinois. Citadel Execution Services provides an array of trading and execution services for their clients. They do not provide any internal research.

Knight Capital Group, Inc. is a global financial services firm, which provides access to the capital markets across multiple asset classes to a broad network of clients, including buy and sell side firms, dealers, brokers, institutions, and corporations. It operates business through four segments: Market Making, Institutional Sales and Trading, Electronic Execution Services and Corporate and Other. The Market Making segment consists of market making in global equities and listed domestic options. It includes client, and to a lesser extent, non-client electronic market making activities in which they operate as a market maker in equity securities. The Institutional Sales and Trading segment includes global equity, exchange traded funds and fixed income sales and trading; reverse mortgage origination and securitization; capital markets; and asset management activities. Its business consists of execution and facilitation equities and fixed income transactions as agent on behalf of institutional clients, and they commit capital on behalf of its clients when needed. The Electronic Execution Services segment offers access via its electronic agency-based platforms to markets and self-directed trading in equities, equity options, fixed income, foreign exchange and futures contracts. The Corporate and Other segment invests in strategic financial services-oriented opportunities, allocates, deploys and monitors all capital, and maintains corporate overhead expenses and all other income and expenses that are not attributable to the other segments. The company was founded in 1995 and is headquartered in Jersey City, NJ.

The Options Clearing Corp. provides equity derivatives clearing services. It provides central counterparty clearing and settlement services to stock exchanges and trading platforms for options, financial futures, security futures and securities lending transactions. The company was founded in 1973 and is headquartered in Chicago, IL.