#2 McAfee:

Led by John McAfee, who recently headlined suspecting his connections with a murder, security company McAfee comes at number 2 spot.

McAfee is an American global computer security software company headquartered in Santa Clara, California, and the world's largest dedicated security technology company. As of February 28, 2011, McAfee is a wholly owned subsidiary of Intel.

McAfee's competitors in the antivirus industry are Avira, BullGuard, F-Secure, Frisk, Kaspersky, Sophos, Symantec, and Trend Micro to name a few.

According to Gartner, second-placed McAfee showed significant growth of 37 percent in 2012 to reach $1.7 billion. This was driven by a combination of organic growth, acquisitions and the indirect impact of a 2011 revenue write-down following Intel's acquisition of McAfee, whereas the market shares jumped up by 8.8 percent.

In the year 2011, McAfee’s revenue was clocked at $1.2 billion.

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