The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -0.64%), AbbVie (ABBV -2.67%), Roche (RHHBY -0.66%), Johnson & Johnson (JNJ 0.29%), and AstraZeneca (AZN -0.24%) 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.