The 3 Greatest Risks Pfizer Faces

Pfizer (NYSE: PFE) shareholders have plenty of reasons to be optimistic. Shares of the big drugmaker are up 15% over the last 12 months, well above the return of the S&P 500 index. Pfizer's dividend yield of nearly 3.4% looks also should bring smiles to investors' faces. And the company arguably has its strongest pipeline in years.