HQ: Milpitas, Calif.
CEO: David DeWalt
New Funding: $50 million
Backers: Sequoia Capital, Norwest Venture Partners, Goldman Sachs, Juniper Networks, Silicon Valley Bank, others
Does IT security have a hotter startup right now than FireEye? The company, whose technology is intended to stop zero-day, APT and other "next-gen" security threats that get around traditional security platforms, reported $100 million and a more-than-100 percent increase in bookings in 2012. Among other key moves, it reeled in ex-McAfee CEO Dave DeWalt as chief executive, and in early January confirmed six additional new executive team members, including AVAST, Cisco, EMC, McAfee and Ensighta veterans.