Symantec

CEO: Greg Clark

Dec. 30, 2016: $23.89

June 30, 2017: $28.25

Change: +18.25%

Symantec has been through some turbulent times, including selling off its Veritas storage technology business in 2015 and buying security software developer Blue Coat Systems for $4.65 billion last August – the latter resulting in changes in Symantec's top executive ranks.

The changes appear to have given Symantec new momentum. Adding to that was the February acquisition of LifeLock, the provider of identity-theft protection and remediation services, for $2.3 billion.

For all of fiscal 2017 ended March 31 Symantec reported revenue of $4.02 billion, up 12 percent from $3.60 billion in fiscal 2016. But the company reported a $106 million loss for the year, compared with net income of $2.49 billion (the latter including income from discontinued operations) in fiscal 2016.