William T. Yates

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.

TD Ameritrade Holding Corp. engages in the provision of securities brokerage services and related technology-based financial services. It offers the following products and services to retail clients: touch-tone trading, trading over the internet, unlimited streaming, free real-time quotes, extended trading hours, direct access to market destinations and commitment ton the speed of order execution. The company was founded by John Joe Ricketts in 1971 and is headquartered in Omaha, NE.