FireEye shares jumped more than 20 percent after Thursday's announcement of the $1.05 billion cash-and-stock deal. It unites two companies with relatively new technologies for dealing with cyber-attacks. The new firm has two of the most-respected executives in the security industry: FireEye CEO Dave DeWalt and Mandiant founder Kevin Mandia.
FireEye's cloud-based systems for detecting malicious software and Mandiant's software that analyzes cyber attacks have been doing well while traditional security companies have done less well.
About a year ago, the two companies entered into a technology development agreement that made it easier to deploy their products together. With the merger, FireEye will gain Mandiant's team of forensics investigators. FireEye, which has yet to post a profit, said the acquisition will be immediately accretive to earnings and expects the combined company's revenue to grow about 50 percent this year.