May 8 Costco Wholesale Corp said April same-store sales rose 5 percent, helped by higher gasoline prices.
Net sales at the largest U.S. warehouse operator rose 7 percent to $8.56 billion for the four-week period ended May 4.
Analysts expected a 3.2 percent rise in Costco's April same store sales, including fuel sales, according to Thomson Reuters data.
Excluding the impact of fuel and foreign exchange, comparable sales rose 5 percent for the period.
Costco, which offers everyday items below supermarket prices, operates 652 warehouses worldwide.
(Reporting by Ankush Sharma in Bangalore; Editing by Sunil Nair)