July 30, 2011-  Gartner released a report of the 2010 worldwide market share of the top five security software vendors.  Symantec had 18.9% of the market, McAfee 10.4%,  Trend Micro 6.3%, IBM 4.9% and EMC 3.8%.  Collectively, the top five vendors now control less of the market than they did five years ago, losing share to smaller vendors.