<Tr> <Th> Number of employees </Th> <Td> 8,800 </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.amtd.com www.tdameritrade.com </Td> </Tr> <P> TD Ameritrade is a brokerage firm based in Omaha, Nebraska with a major trading center in St Louis, Missouri . 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 . </P> <P> As of September 30, 2017, Ameritrade had 11,004,000 funded customer accounts and client assets of $1.118 trillion . In fiscal year 2017, the company executed an average of 510,710 client transactions per day . </P>

What does the td in td ameritrade stand for