The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -0.02%), AbbVie (ABBV 1.05%), Roche (RHHBY 1.16%), Johnson & Johnson (JNJ 1.06%), and AstraZeneca (AZN 0.50%) also performed extraordinarily well. The following slideshow reveals why these companies beat out their big pharma peers and what drove their strong performances in 2013.