TD Ameritrade Holding Corporation (TD AMERITRADE) is a provider of securities brokerage services, and technology-based financial services to retail investors and business partners.The Company provides securities brokerage services, including trade execution, clearing services and margin lending. The Company provides trustee, custodial and other trust-related services to retirement plans and other custodial accounts. The Company provides a suite of investor education products and services. The Company also provides cash sweep products through third-party banking relationships. The Company provides its services through the Internet, a national branch network and relationships with registered investment advisors (RIAs). The Company’s subsidiary TD AMERITRADE Clearing, Inc. (TDA Clearing) provides clearing and execution services. On June 11, 2009, the Company completed the acquisition of thinkorswim Group Inc.