Nancy Pelosi may be retiring, but the app that helped make her an iconic stock trader — and now has more than $1 billion under management and 3 million downloads — is just getting started. "It's kind of the end of an era," says Christopher Josephs, who founded the Pelosi Tracker on social media and the accompanying app Autopilot that lets users follow top traders and follow their investments. "It's turning the chapter on the political stock trading movement.”