Investing.com -- Costco reported Thursday mixed fiscal second-quarter results after earnings missed estimates even as cash-strapped consumers turned to bulk-buying, boosting sales.

Costco Wholesale Corp (NASDAQ: COST) fell 1% in afterhours trading following the news.

For the three months ended Feb. 16, the big box retailer reported earnings per diluted share of $4.02, missing estimates for EPS of $4.11, while revenue of $63.72 billion, topped forecasts of $63.08 billion.

Comparable sales, including gas and currency changes, increased by 6.8% in the 12 weeks ended on Feb.16.