Robinhood is a commission-free, mobile-first stock brokerage. Robinhood's online trading platform charges zero commission on stock and cyptocurrency transactions. When Robinhood launched in 2013, more than 10,000 users signed up on the first day, 50,000 users joined in the first week, and almost 1 million users signed up in the first year. The company has continued to grow quickly since. The company primarily generates revenue by interest on cash in customer accounts, as well as premium features like margin-lending and after-hours trading.