TD Ameritrade is a brokerage firm based in Omaha, Nebraska. The letters TD are derived from Toronto-Dominion Bank, the largest shareholder. The company provides services for individuals and institutions that are investing online. The company offers an electronic trading platform for the purchase and sale of financial securities including common stocks, preferred stocks, futures contracts, exchange-traded funds, options, mutual funds, and fixed income investments. It also provides margin lending, and cash management services.