The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -1.42%), AbbVie (ABBV -0.96%), Roche (RHHBY 1.73%), Johnson & Johnson (JNJ -0.92%), and AstraZeneca (AZN 1.06%) 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.