Cowen Upgrades Walgreens: Here's Why By: Benzinga via Benzinga September 09, 2015 at 14:33 PM EDT Shares of Walgreens Boots Alliance Inc (NASDAQ: WBA) traded higher after Wednesday's market open, but gave up its gains despite an ... Read More >> Related Stocks: AmerisourceBergen Corp Express Scripts Holding Rite Aid Corp Walgreens Boots Alliance