Marriott International Inc (MAR.O) said on Friday that hackers accessed up to 500 million customer records in its Starwood Hotels reservation system in an attack that began four years ago, exposing data including passport numbers and payment cards.
Shares were down 5.7 percent in late afternoon trade on news of the hack, one of the largest in history, which prompted regulators in Britain and at least five U.S. states to launch investigations.
The Federal Bureau of Investigation said it was looking into the attack on Starwood, whose brands include Sheraton, St. Regis, W and Westin hotels. It advised affected customers to check for identity fraud and report it to the bureau’s Internet Crime Complaint Center.
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