December sales at Costco increased more than 14% as comparable store sales for the five-week period ended December 31 were also up more than 11%.
For the final month of 2017, total net sales were $14.94 billion, up from $13.07 billion from the same period the previous year. Total company comparable store sales were up 11.5% with same-store sales at U.S. stores up 10.5%.
For the first 17 weeks of fiscal year 2018 ended December 31, 2017, the company reported net sales of $46.06 billion, an increase of 11.9% from $41.18 billion reported during the similar period last year. Company-wide comparable store sales for the quarter were up 9.1% and up 8.5% in the U.S.
This year’s December retail month had one additional shopping day as compared to last year due to the calendar shift of New Year’s Day. The shift positively impacted total and comparable sales by approximately 2.5% for the five-week December retail month. The 17-week fiscal year was not impacted.