Robinhood, the trading app that took young people and financiers by storm, now boasts 13 million user accounts. Its zero-commission trading model prompted an overhaul of the online brokerage ecosystem, although the company has run into SEC investigations, hackers, and performance outages along the way. In an extended interview with Andrew Ross Sorkin, CEO Vlad Tenev discusses the role Robinhood plays in the financial system and the risks and rewards of retail investors engaging in high volume trading. Tenev addresses wide ranging criticisms of his platform, and considers what’s next for the $11B-valued app.