Based on that criteria, Uber & AirBnB should be on top of this list, followed by Palantir and Stripe. Zenefits has not really shown the type of defensible traction that Uber / AirBnB have (right now they are simply a rapidly growing insurance agent with a difficult-to-scale direct sales model). I would not add Spotify to this list - bad margins, and hard to defend against Google / Apple.