Shares of Costco Wholesale (NASDAQ: COST) took a dive last month after the warehouse retail giant posted disappointing comparable sales for November and followed that up with a middling fiscal first-quarter earnings report.

According to data from S&P Global Market Intelligence, Costco finished December down 15%, an unusually sharp slide for the solid consumer staples stock. As you can see from the chart below, Costco shares dove to start the month and continued to slide from there. 

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Source Fool.com