FireEye stock plunges as results, outlook disappoint

FireEye Inc shares lost about a quarter of their value Thursday as the former Wall Street darling missed quarterly forecasts and cut its outlook, saying reduced Chinese hacking had hurt U.S. demand and sales fell short in Europe. Wall Street analysts and industry watchers said that they were skeptical of FireEye's assertion that a U.S.-China agreement to clamp down on hacking had hurt sales at a time when corporations are placing unprecedented attention on efforts to beef up security. "This is a