This big pharma stock still faces significant challenges in the new year.A rising tide doesn't lift all boats. For example, a boat with gaping holes in its hull will sink regardless of how high the tide rises. Pfizer (PFE 0.59%) seemed to be the investing equivalent of such a boat in 2025.Shares of the pharmaceutical giant declined 6% last year, experiencing several significant fluctuations along the way. Can Pfizer's stock bounce back in 2026? NYSE : PFEPfizerToday's Change( -0.59 %) $-0.15Current Price$ ...