The multinational warehouse club chain announced December net sales of $15.42 billion, an increase of 7.8% from $14.3 billion in the same period last year.
Shares were up 0.4% to $210.64 after the close of trading on Thursday.
For the 18 weeks ended Jan. 6, the company reported net sales of $52.99 billion, an increase of 9.5% from $48.39 billion last year. U.S. stores saw comparable sales for the 18-week period rise 10%, while total comparable sales grew 7.9%.
E-commerce comparable sales rose 13.6% in December, while online comp sales for the 18-week period grew 27.9%.
Total comparable sales excluding the impact of gasoline prices, foreign exchange and a previously disclosed accounting change for revenue was 7% in December, with online sales rising 23.9%.
Costco missed on earnings in the the last quarter after two straight quarters of positive earnings surprises. Revenue has beaten estimates for seven straight quarters.
Costco currently operates 768 warehouses globally, with 533 in the United States and Puerto Rico, 100 in Canada, 39 in Mexico, 28 in the United Kingdom, 26 in Japan, 15 in Korea, 13 in Taiwan, 10 in Australia, two in Spain, one in Iceland and one in France. The company planned to open about 23 net new warehouses in the last quarter, mostly in the United States.