The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -1.43%), AbbVie (ABBV 1.45%), Roche (RHHBY -0.71%), Johnson & Johnson (JNJ 1.14%), and AstraZeneca (AZN 2.99%) 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.