X0202 3 2007-04-26 0 0001301081 Pharmasset Inc VRUS 0001284621 OTTO MICHAEL 303A COLLEGE ROAD EAST PRINCETON NJ 08540 0 1 0 0 Exec.VP, Pharm. Research Common Stock 9500 D Stock Option (right to buy) 2.55 2009-08-05 Common Stock 37167 D Stock Option (right to buy) 6.00 2010-09-14 Common Stock 5000 D Stock Option (right to buy) 3.00 2014-08-09 Common Stock 93333 D Stock Option (right to buy) 3.87 2016-05-23 Common Stock 40000 D Stock Option (right to buy) 4.02 2016-11-06 Common Stock 20000 D The option vested in four equal annual installments beginning on August 6, 2000. The option vested in four equal annual installments beginning on September 15, 2001. The option vested 25% on August 10, 2005, and vest 6.25% quarterly thereafter. The option vested 25% on August 10, 2006, and vests 6.25% quarterly thereafter. The option vests 25% on November 7, 2007, and vests 6.25% quarterly thereafter. /s/ Bryce Roberts 2007-04-26