It once took Fortune 500 companies an average of 20 years to reach a billion-dollar valuation. Disruptive start-ups now reach that milestone four years or less, while displacing long time incumbents and reshaping the business landscape. How are these start-ups working with customers to disrupt industry goliaths? Hear from four disruptive start-up CEOs about how they're blazing new trails to connect to customers in a whole new way, leveraging the latest technology to fuel rapid growth, and ultimately shape the future of the world with Fortune moderator Pattie Sellers. Panelists include Payal Kadakia (ClassPass), Philip Krim (Casper), Tracy Young (PlanGrid), and Linden Tibbets (IFTTT).