Rishi Shah and Shradha Agarwal

This more than 10-year-old health-tech firm, helmed by CEO Shah -- a college dropout (pictured right) -- and president Agarwal, raised the kind of money that unicorns dream about earlier this year, bringing in over $500 million at a valuation of more than $5 billion. Outcome says it has already outfitted more than 40,000 doctor's offices with touch screens and tablets that can deliver meditation apps, relevant medical information, and (of course) advertising to patients.