The company sold its first batch of shares in September 2013 for $20 apiece, taking in $303.5 million, but the stock price nearly doubled in its market debut and has steadily risen since, moving as high as $97.35 this week. The $1 billion acquisition of Mandia's security startup, Mandiant, has been one of the big drivers for Wall Street's FireEye enthusiasm, as it paired Mandiant's ability to respond to data breaches with FireEye's groundbreaking threat-detection technology. "The Mandiant acquisition was a game changer because it really morphed FireEye into a pure end-to-end, next-generation security method," FBR Capital Markets analyst Daniel Ives said Friday, calling it "a one plus one equals three equation."