The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY 0.10%), AbbVie (ABBV 0.83%), Roche (RHHBY -1.76%), Johnson & Johnson (JNJ 0.45%), and AstraZeneca (AZN -0.81%) 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.