The ongoing corporate battle between Pfizer and activist investment firm Starboard Value escalated on Thursday when Starboard pushed Pfizers board to investigate alleged coercive actions. This follows the

Starboard Value has amassed a roughly $1 billion stake in drugmaker Pfizer, according to people familiar with the matter. The activist fund run by Jeff Smith is looking to tap former Pfizer CEO Ian Read and ex-finance chief Frank D'Amelio,

Activist investor Starboard Value has taken a stake of about $1 billion in Pfizer and wants the U.S. drug giant to make changes to turn its performance around, sources familiar with the matter said on Sunday.