shares of costco wholesale corp cost sank 041 to 49322 monday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 016 to 397753 and the dow jones industrial average djia rising 060 to 3243208 the stocks fall snapped a twoday winning streak costco wholesale corp closed 11905 below its 52week high 61227 which the company reached on april 7th the stock underperformed when compared to some of its competitors monday as amazoncom inc amzn fell 009 to 9804 and walmart inc wmt rose 167 to 14417 trading volume 15 m remained 475412 below its 50day average volume of 19 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use