Costco (COST -2.1%) shares are lowered to Underperform at Bernstein, which notes that the...

|About: Costco Wholesale Corporation (COST)|By:, SA News Editor

Costco (COST -2.1%) shares are lowered to Underperform at Bernstein, which notes that the warehouse-style retailer's operating margins have come under pressure in the past two quarters. "We expect this pressure to persist, making current consensus forecasts look far too optimistic," the firm says.