American Express Travel Related Services Company, Inc. and/or its Affiliates

American Express notified California residents that a merchant where they used their card detected unauthorized access to its website files on July 11, 2011. The breach exposed card account numbers, names, and expiration dates. Social Security numbers were not impacted. American Express placed additional fraud monitoring on affected accounts and advised customers to review statements and credit reports.

American Express Travel Related Services Company, Inc. reported a data security breach involving unauthorized access to a merchant's website files. The incident compromised cardholder data, including American Express account numbers, names, and expiration dates. Social Security numbers were not impacted, and no unauthorized activity was detected on card accounts. The company placed additional fraud monitoring on affected cards and notified cardholders via letter.