High Quality Content by WIKIPEDIA articles! TD Ameritrade is an online broker with over 6 million U.S. customers, and many more internationally, that has grown rapidly through acquisition, to become the 746th-largest US firm in 2008. TD AMERITRADE Holding Corporation (NASDAQ: AMTD) is the owner of TD AMERITRADE Inc.. Services offered include common and preferred stocks, ETFs, option trades, mutual funds, fixed income, margin lending, and cash management services.The preferred customers of Ameritrade, Apex clients make either fifteen trades per quarter or have an account balance of one hundred thousand dollars to qualify. Ameritrade Apex clients also receive level-two quote-scope software. With level two they can see all stock orders placed by market makers in real time.