shares of costco wholesale corp cost slid 224 to 48598 thursday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 036 to 410502 and the dow jones industrial average djia rising 001 to 3348529 this was the stocks second consecutive day of losses costco wholesale corp closed 12629 short of its 52week high 61227 which the company reached on april 7th the stock underperformed when compared to some of its competitors thursday as amazoncom