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Thinkorswim, Inc. was founded in 1999 by Tom Sosnoff and Scott Sheridan as an online brokerage specializing in options. [2] It was funded by Technology Crossover Ventures. [3] In February 2007, Investools acquired Thinkorswim. [4] In January 2009, it was acquired by TD Ameritrade in a cash and stock deal valued around $606 million.
Sosnoff, who spent 10 years as an options-market maker at the Chicago Mercantile Exchange, created Thinkorswim in 1999 and sold it this year to TD Ameritrade for more than $600 million.