Shares of Costco Wholesale Corporation ( COST ) rose marginally by 0.1% following comparable-store sales results for June, the five weeks ended Jul 6, 2014, that bettered analysts' expectations. Excluding the effect of gasoline prices and foreign currency fluctuations, Costco's comparable-store sales for the period jumped 6%. Excluding the effect of inflation in gasoline prices and impact of foreign currency fluctuations, Costco's comparable-store sales for June rose 6%, reflecting comparable sales growth of 6% at its U.S. locations and 8% at international outlets.