Key TakeawaysVertex shares slipped in extended trading Wednesday after the company announced it had agreed to acquire Alpine Immune Sciences for 4.9billion.ThedealvalueseachAlpineshareat65, representing a 38% premium to Wednesday’s closing price of 47.04.TheacquisitionprovidesVertexwithaccesstoAlpine’smid−stagedevelopmentantagonistpovetacicepttotreatakidneyautoimmunediseasecalledIgAnephropathy(IgAN).TheVertexsharepricemayfindbuyinginterestaround390 from an uptrend l ...