Thinkorswim, Inc. was founded in 1999 by
Tom Sosnoff and Scott Sheridan as an online brokerage specializing in options.[2][3] It was funded by
Technology Crossover Ventures.[4] In February 2007, Investools acquired Thinkorswim.[5] In January 2009, it was acquired by
TD Ameritrade in a cash and stock deal valued around $606 million.[6][7][8] In October 2022,
Charles Schwab Corporation acquired
TD Ameritrade and the thinkorswim platform became available for Charles Schwab customers.[9]