This eleven-year-old file-sharing and content-management company was Inc.'s 2013 Company of the Year--and now it's made the 2017 Founders 10 list… by keeping its focus narrow. With more than 71,000 enterprise customers, the Redwood City, California-based company innovates by carefully picking its targets and listening to a select group of customers. "We have a very fast feedback loop with that small set of customers," says co-founder and CEO Aaron Levie. "And as they adopt the next innovation, it will ripple through the customer base."read more