Costco Wholesale Corp. on Wednesday reported a 9.9% year-over-year sales gain through the final stretch of the holiday-shopping season, marked by a big jump in online sales.

Key Takeaways Costco's net sales during the five-week December period improved 10% year-over-year.Holiday period sales beat analysts' expectations amid improving consumer spending environment, JPMorgan said.

Costco Wholesale shares are trading higher after the company released its December sales results. Here's what to know.

Food Deals to Stock Up On Each month, Costco comes out with a coupon book full of exciting deals, and this month’s Costco ad is no different. You really save more when you shop their sales ad, which is basically their monthly coupon book.