Nutanix

This San Jose, California-based data-storage provider has more than 5,300 customers, including Toyota, Best Buy, Hyundai, and the U.S. Defense Department. And it's retained them by consolidating servers and storage systems into a single platform, earning it a standout reputation for "ease of use, simplified management, and no-disruptive capacity," according to a 2016 Forrester report. Founded in 2009, Nutanix recorded $445 million in annual revenue by its September 2016 IPO--and it got there with a focus on both customers and employees. As its co-founder and CEO, Dheeraj Pandey, explains: "Ambition and attention to detail have to go hand in hand."