Costco Wholesale Corporation reported sales results for the month and 17 weeks of fiscal 2018 ended December 31, 2017. For the month, net sales came in at $14.94 billion, an increase of 14.3% from $13.07 billion last year. 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 the $41.18 billion reported during the similar period last year.