Nike is suffering as Adidas and Under Armour gain momentum By: MarketWatch December 06, 2016 at 12:45 PM EST Nike shares were downgraded at Cowen & Company on concerns that Adidas and Under Armour are taking share from the athletic leader. Read More >> Related Stocks: Dick's Sporting Goods Inc Jabil Circuit Kohl's Corp Nike Inc Standard & Poors 500 Under Armour