The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -0.34%), AbbVie (ABBV -0.46%), Roche (RHHBY -0.27%), Johnson & Johnson (JNJ 3.09%), and AstraZeneca (AZN 0.32%) 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.