The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY -2.92%), AbbVie (ABBV -2.82%), Roche (RHHBY -0.35%), Johnson & Johnson (JNJ -1.83%), and AstraZeneca (AZN -3.49%) 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.