DEERFIELD, Ill.--( BUSINESS WIRE )--Walgreens Boots Alliance, Inc. (Nasdaq: WBA) today announced that it has commenced an offering of 10 million shares of AmerisourceBergen Corporation (NYSE: ABC) common stock in a registered public offering and, subject to the completion of the offering, a concurrent share repurchase by AmerisourceBergen in the amount of approximately $500 million. After the sale, Walgreens Boots Alliance's ownership of AmerisourceBergen's common stock has decreased from approximately 26 percent to approximately 20 percent. Walgreens Boots Alliance intends to use the proceeds primarily for debt paydown and the continued support of the company's strategic priorities, including acquisitions.