Shares of the nation's warehouse clubs were mixed Thursday after B.J.'s Wholesale Club and Costco Wholesale Corp. said their sales climbed in July.
Costco sales at stores open at least a year were better than analysts expected, while B.J.'s fell short of forecasts.
Earlier Thursday, Costco said revenue at its stores that had been open at least a year rose 6 percent in July, helped by fuel sales and international revenue. The figure was 4 percent for stores open at least a year in the U.S. and 14 percent for stores abroad.
The comparison of sales at stores open at least a year is a key indicator of a retailer's performance because it excludes stores that open or close during the year.
Excluding gasoline sales, Costco's figure rose 4 percent.
Analysts surveyed by Thomson Reuters, on average, expected a 5.5 percent increase overall and a 4.7 percent increase excluding gasoline sales.
Costco's total sales for the four weeks that ended Aug. 1 rose 8 percent to $5.86 billion from $5.42 billion last year.
Meanwhile, B.J.'s revenue from stores open at least a year climbed 2.8 percent in July. Excluding gasoline sales, it rose 1.9 percent.
Analysts expected a 4.5 percent increase for B.J.'s, or 3.8 percent excluding gasoline sales.
B.J.'s net revenue for the month rose 6.6 percent to $770.3 million from $722.5 million in July 2009 as customers spent more money on cigarettes, drinks, housewares, produce, tires and water.
Costco shares were down 99 cents, or 1.7 percent, trading at $56.41 at midday.
BJ's stock rose 42 cents, less than 1 percent, to $45.03.