John Joseph Ricketts is an American billionaire businessman. He is the founder, former CEO and former chairman of TD Ameritrade. He has an estimated net worth of US$4.1 billion As of 2024 according to Forbes. He has pursued a variety of other business ventures including DNAinfo.com, High Plains Bison, The Lodge at Jackson Fork, and The American Film Company. Ricketts also engages in philanthropy through The Ricketts Art Foundation, Opportunity Education Foundation, The Cloisters on the Platte Foundation, and The Ricketts Conservation Foundation. He and his family have been the owners of the Chicago Cubs Major League Baseball team since October 2009.

TD Ameritrade is a stockbroker that offers an electronic trading platform for the trade of financial assets including common stocks, preferred stocks, futures contracts, exchange-traded funds, forex, options, mutual funds, fixed income investments, margin lending, and cash management services. The company receives revenue from interest income on margin balances, commissions for order execution, and payment for order flow.