The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY 0.06%), AbbVie (ABBV -0.18%), Roche (RHHBY -1.06%), Johnson & Johnson (JNJ -0.61%), and AstraZeneca (AZN -1.22%) 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.