Costco (COST), one of the biggest names in retail, slips after earnings. Despite a beat on the top line and membership fees, revenue and comp. sales didn't sell enough for investors. HP Inc. (HPQ) also fell after getting a downgrade, while Bristol-Myers Squibb (BMY) climbed off of FDA approval for its schizophrenia drug. Diane King Hall takes a closer look into the morning's top headlines.