The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY 0.15%), AbbVie (ABBV 0.46%), Roche (RHHBY 0.60%), Johnson & Johnson (JNJ -0.35%), and AstraZeneca (AZN 0.51%) 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.