Deals
AmEx Tumbles as Lender Ends Partnership With Costco in U.S.
Why Amex Is Losing Its Grip on the Wealthy
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American Express Co., the biggest U.S. credit-card issuer by customer purchases, fell the most since 2011 after announcing that its relationship with Costco Wholesale Corp. in the U.S. will end.
AmEx tumbled 5.9 percent to $80.95 at 10:54 a.m. in New York, the worst performance in the Dow Jones Industrial Average. The shares have slid 13 percent this year, the most in the 30-company Dow.