William Blair Downgrades Pharmasset (VRUS) to Market Perform Dec 19, 2011 06:04AM
William Blair Downgrades Pharmasset (VRUS) to Market Perform Nov 22, 2011 08:39AM
William Blair Starts Pharmasset (VRUS) at Outperform May 26, 2011 07:58AM
William Blair Initiates Coverage on Pharmasset (VRUS) with an Outperform Sep 24, 2009 08:22AM