FireEye

CEO: Kevin Mandia

Dec. 30, 2016: $11.90

June 30, 2017: $15.21

Change: +27.82%

FireEye's stock had been on a long decline – dropping nearly 43 percent in 2016 – before rebounding a bit in the first quarter. FireEye also has been the subject of acquisition rumors: In February reports surfaced that Symantec had held talks with the company in recent months about a possible buyout.

For its first quarter ended March 3,1 FireEye reported revenue of $173.7 million, up 3 percent from $168.0 million in the same quarter last year. The company reported a loss of $83.0 million for the quarter, an improvement over the $155.9 million loss in the same quarter one year earlier.