The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -0.98%), AbbVie (ABBV 0.23%), Roche (RHHBY -1.53%), Johnson & Johnson (JNJ -0.34%), and AstraZeneca (AZN 0.45%) 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.