TD Ameritrade Holding Corporation. The Group's principal activity is to provide securities brokerage services and technology-based financial services to retail investors and business partners. It provides its services predominantly through the internet, a national branch network and relationships with independent registered investment advisors. The ... More

TD Ameritrade Holding Corporation. The Group's principal activity is to provide securities brokerage services and technology-based financial services to retail investors and business partners. It provides its services predominantly through the internet, a national branch network and relationships with independent registered investment advisors. The Group provides trustee, custodial and other trust-related services to retirement plans and other custodial accounts through its subsidiary. Its education subsidiary provides a comprehensive suite of investor education products and services. The Group also provides cash sweep products through third-party banking relationships. On 11-June-2009, it acquired thinkorswim Group Inc.