The 5 Best-Performing Big Pharma Stocks of 2013: BMY, ABBV, RHHBY, JNJ, AZN

The S&P 500 soared more than 32% in 2013, and several big pharma companies, namely Bristol-Myers Squibb (BMY +0.60%), AbbVie (ABBV 1.43%), Roche (RHHBY +0.50%), Johnson & Johnson (JNJ 0.27%), and AstraZeneca (AZN +0.22%) 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.