“JPMorgan Chase, the nation’s biggest bank, ignored internal controls and manipulated documents as it racked up trading losses last year, while its influential chief executive, Jamie Dimon, briefly withheld some information from regulators, a new Senate report says.

“The findings by the Congressional investigators shed new light on the multibillion-dollar trading blunder, which has claimed the jobs of several top executives and prompted an inquiry by the Federal Bureau of Investigation. The 300-page report, released a day before a Senate subcommittee plans to question bank executives and regulators at a hearing, will escalate the debate over how to police complex risk-taking on Wall Street. It may also foreshadow a criminal case against employees at the heart of the troubled wager.

“A spokeswoman for the bank said on Thursday, “While we have repeatedly acknowledged significant mistakes, our senior management acted in good faith and never had any intent to mislead anyone.”

“Mr. Dimon, whose reputation as an astute manager of risk has been undercut by the trading losses, comes under the harshest criticism yet from the Senate investigators. The chief executive signed off on changes to an internal alarm system that underestimated losses, seemingly contradicting his earlier statements to lawmakers, according to the report.”

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