JPMorgan Chase & Co. said it faces a U.S. criminal probeinto foreign-exchange dealings and boosted its maximum estimate for“reasonably possible” losses on legal cases to the highest in morethan a year. The shares fell in New York.

The firm is cooperating with the criminal investigation by theDepartment of Justice as well as inquiries by regulators in theU.K. and elsewhere, it said yesterday in a quarterly report. Thelargest U.S. bank said it might need as much as $5.9 billion tocover losses beyond reserves for legal matters, up $1.3 billionfrom the end of June, and the most since mid-2013.

“In recent months, U.S. government officials have emphasizedtheir willingness to bring criminal actions against financialinstitutions,” the bank wrote of the general legal environment.“Such actions can have significant collateral consequences for asubject financial institution, including loss of customers andbusiness.”