Andeavor Investor Sues to Block Pipeline Units $9 Billion Merger

A U.S. shareholder sued to block a $9 billion merger of pipeline partnerships controlled by Marathon Petroleum Corp., claiming the directors at one of the units failed to provide enough information for investors to evaluate the fairness of the deal.

MPLX LP agreed to acquire Andeavor Logistics LP in May in an all-stock deal that the companies said would help streamline their corporate structure. Marathon had bought out Andeavor’s majority shareholder in October for $22 billion to create the country’s largest independent oil refiner.

Max Pyziur, an investor in Andeavor, sued in New York in federal court June 19, asking ...