The S&P 500 soared more than 32% in 2013, and several big pharma companies also soared. Some, however -- namely Sanofi (NYSE:SNY)Novo Nordisk (NYSE:NVO), and Eli Lilly (NYSE:LLY) -- significantly trailed their peers. To find out why these stocks stumbled last year, and what they need to do to soar this year, click on the following slideshow.

Max Macaluso, Ph.D., and The Motley Fool have no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.