TD Ameritrade Holding Corporation, through its subsidiaries, provides securities brokerage services and technology-based financial services to retail investors, traders, and independent registered investment advisors (RIAs) in the United States. The company’s offerings include TD Ameritrade for self-directed retail investors; TD Ameritrade Institutional, which provides brokerage and custody services to independent RIAs and their clients; thinkorswim that offers a suite of trading platforms serving self-directed and institutional traders, and money managers; and Investools, which provides investor education products and services for stock, option, foreign exchange, futures, mutual fund, and fixed-income investors. Its offerings also include Amerivest, an online advisory service that develops portfolios of exchange-traded funds to enable long-term investors pursue their financial goals; and TD Ameritrade Corporate Services, which provides self-directed brokerage services to employees and executives of corporations. In addition, the company offers various products and services, such as common and preferred stocks; exchange-traded funds; a range of option trades, including complex, multi-leg option strategies; futures trades in various commodities, stock indices, and currencies; and foreign exchange products. Further, it provides mutual funds; treasury, corporate, government agency, and municipal bonds; mortgage-backed securities and certificates of deposit; new issue securities; margin lending; and cash management services. Additionally, the company offers trustee, custodial, and other trust-related services to retirement plans; and cash sweep and deposit account products through third-party relationships. It provides its products and services through the Internet, network of retail branches, mobile trading applications, and interactive voice response and registered representatives via telephone. The company was founded in 1971 and is headquartered in Omaha, Nebraska.