Stocks Fell Today. Costco's Shares Rose. Here's Why.

Chris Allan / Getty Images Shares of Costco rose Thursday after the company reported September sales data. Key Takeaways Retail giant Costco reported September sales showing a rise a bit less upbeat than it reported a year ago. The stock rose Thursday anyway. One likely reason why: Investors noted that last year's September sales were higher for reasons associated with port strikes and a hurricane. Costco stock got a lift on a day when U.S. indexes fell. Strong September sales numbers helped. Share ...