CLEVELAND--(BUSINESS WIRE)--The Peiffer Rosca Wolf law firm has commenced an investigation into Walgreen Co. (NYSE: WAG) (“Walgreens”), the U.S.’s largest drugstore retailer. Since its 2014 merger with Alliance Boots GmbH (“Alliance Boots”), a similar business with operations outside the United States, Walgreens has been known as Walgreens Boots Alliance, Inc. A securities class action has been filed against Walgreens on behalf of investors who purchased Walgreens’ common stock from March 25, 2


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