Costco Wholesale Corp (NASDAQ:COST) shares are trading lower following the company's Q4 results. The company reported a 9.4% YoY increase in net sales to $77.43 billion and total revenues of $78.939 billion, beating the consensus estimate of $77.9 billion. Costco also reported Q4 earnings of $4.86 per share, beating analyst estimates of $4.79 per share. Despite these positive results, the company's shares were down 1.62% at the time of publication.