After a solid two-year run, Gilead Sciences (GILD 0.07%) has fallen from investors graces, down for the year. The biotech has become increasingly reliant on its hepatitis C drug Sovaldi, with competition from AbbVie (ABBV -1.03%)and Merck (MRK 0.10%) around the corner.

In the slideshow below, you'll find three reasons investors are down on Gilead Sciences and thoughts on the biotech's future.