Costco Wholesale (COST) reported fiscal Q2 earnings late Thursday of $3.92 per diluted share, up from $3.30 a year earlier.
Analysts polled by Capital IQ expected $3.61.
Net sales for the quarter were $58.44 billion, up from $55.27 billion a year earlier.
Analysts surveyed by Capital IQ expected $59.13 billion.
Costco shares fell past 4% in after-hours trading.