Tom Sosnoff

Active Investor

Co-Founder & CEO at Lossdog

Chicago, Illinois

Tom Sosnoff, Co-Founder & CEO at Lossdog is an active investor based in Chicago, Illinois. This profile covers what Tom Sosnoff backs, at which stage, and how founders can reach out in 2026.

Mr. Tom Sosnoff is a Co-Founder of tastytrade. Mr. Sosnoff served as Board Member at Zero Hash. He is an Angel Investor. Tom Sosnoff, a former trader, became one of Chicago's well-known serial entrepreneurs in financial technology by building a breakthrough options-trading platform, which was later sold for $750 million. He then launched tastytrade, the fastest growing online financial network which produces eight hours of educational and other video programming for traders of all experience levels. Tom is a recognized online brokerage innovator and sought-after financial educator. Tom founded thinkorswim in 1999, and tastytrade in 2011. He is Co-CEO of tastytrade alongside Kristi Ross. He served as Board Member at Dough. Leveraging over 20 years of experience as a market maker for the Chicago Board Options Exchange (CBOE) and one of the original OEX traders in the S&P 100 Index pit, Tom pursued a vision to educate retail investors in options trading and to build a superior software platform and a brokerage firm that specialized in options. Keeping this vision in mind, tastytrade's affiliate, tastyworks, was launched in 2017. With Scott Sheridan as CEO of tastyworks, Tom continues to drive innovation and know-how to the do-it-yourself investor as co-host of tastytrade Live. He holds a BA (Bachelor of Arts) in Political Science from State University of New York (SUNY).

Investor type: Angel
Stages: Early Stage VentureSeedLate Stage Venture
Location: Chicago, Illinois
Typical check: $500K
Past investments: 2

Notable investments

ZeroHashThe Small Exchange

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