Costco Dumps American Express; Investors Don't Like It By: Benzinga via Benzinga February 12, 2015 at 10:38 AM EST American Express Company (NYSE: AXP)'s exclusive U.S. credit card agreement with Costco Wholesale Corp. (NASDAQ: COST) will end ... Read More >> Related Stocks: American Express Capital One Financial Costco Wholesale Delta Air Lines Lowe's Companies MasterCard Starwood Hotels & Resorts