Class Action Lawsuit Aims to Halt GSK Acquisition of Tesaro

In December 2018, London’s GlaxoSmithKline announced plans to acquire Waltham, Mass.-based Tesaro for $5.1 billion. Yesterday, shareholders filed for a class action lawsuit against Tesaro in Delaware federal court, alleging that the merger is based on misleading financial analyses filed with the U.S. Securities and Exchange Commission (SEC).