WHDH-TV | Pfizer's Shares May Plunge After Cholesterol Trial Is Halted Bloomberg - By Shannon Pettypiece and Michelle Fay Cortez. Dec. 3 (Bloomberg) -- Pfizer Inc.'s shares will likely plunge after the world's biggest drugmaker unexpectedly ended development of its most important new drug ... Pfizer Halts testing Of New Drug Pfizer Ends Cholesterol Drug Development |