FireEye

CEO: Kevin Mandia

Dec. 30, 2016: $11.90

March 31, 2017: $12.61

Change: +5.97%

FireEye's stock had been on a long decline – dropping nearly 43 percent in 2016 – before rebounding a bit in the first quarter.

That rebound came despite the company's fourth quarter (ended Dec. 31) earnings report in February, which included revenue that missed Wall Street analyst forecasts. Revenue during the quarter was $184.7 million, essentially flat with the same quarter one year earlier. The vendor did cut its quarterly loss by more than half to $61.5 million from $136.1 million one year ago.

FireEye has also 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.