Heading to the New York City subway in September, Mahesh Saha placed a supercharged bet on a volatile stock. Saha, a 25-year-old law student, tapped a phone app and bought $128 worth of bullish options, the right to purchase shares of uranium producer
That day investors grew more optimistic about Cameco. So, less than 90 minutes later, Saha cashed out his options, for an 84% profit, he says. On ...