TD Ameritrade Holding Corporation provides securities brokerage services and related technology-based financial services to retail investors, traders, and independent registered investment advisors (RIAs) in the United States. Its products and services include tdameritrade.com Web Platform for self-directed retail investors; Trade Architect, a Web-based platform that enables active investors and traders identify opportunities and stay informed; thinkorswim, a desktop platform for traders; and TD Ameritrade Mobile, which allows on-the-go investors and traders to trade and monitor accounts from Web-enabled mobile devices. The company also offers TD Ameritrade Institutional that provides brokerage and custody services to approximately 5,000 independent RIAs and their clients; TD Ameritrade Apex, which offers various services to retail clients; Investools, a suite of investor education products and services for stock, option, foreign exchange, futures, mutual fund, and fixed-income investors; Amerivest, an advisory service that develops portfolios of exchange-traded funds (ETFs) and mutual funds; AdvisorDirect, a national referral service for investors, who wish to engage the services of an independent RIA; and TD Ameritrade Corporate Services that provide self-directed brokerage services to employees of corporations. In addition, it offers various retail brokerage products and services, such as common and preferred stocks; ETFs; options; futures; foreign exchange; mutual funds; fixed income products; primary and secondary offerings of fixed income securities, closed-end funds, and preferred stocks; margin lending; cash management services; and annuities. The company provides its services primarily through the Internet, a network of retail branches, mobile trading applications, interactive voice response, and registered representatives through telephone. TD Ameritrade Holding Corporation was founded in 1971 and is headquartered in Omaha, Nebraska.