The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -0.17%), AbbVie (ABBV 1.44%), Roche (RHHBY 1.12%), Johnson & Johnson (JNJ 0.43%), and AstraZeneca (AZN 1.27%) 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.