UBS 'Rolls Back' Rating On Wal-Mart Due To Valuation By: Benzinga via Benzinga December 04, 2014 at 08:51 AM EST UBS analyst Michael Lasser downgraded shares of Wal-Mart Stores, Inc. (NYSE: WMT) to Neutral from Buy on Thursday with an unchanged ... Read More >> Related Stocks: UBS Group Ag ADR Wal-Mart Stores, Inc.