AbbVie's premium bid for Allergan isn't enough for one investor, who's suing to block it

Allergan encountered years of setbacks before AbbVie swooped in this summer to purchase the company for a whopping $63 billion. But one small-time Allergan investor isn’t happy with the deal—and wants to rally other investors in a class-action suit to block it.

In a New Jersey lawsuit, shareholder YuanLan Swei says the proxy statement detailing AbbVie’s proposed Allergan buyout omits key info for shareholders and sets its top managers up for big payouts that could taint their decision-making about the deal.