A whistleblower whose information helped U.S. and U.K. regulators investigate manipulation of global interest-rate benchmarks by

Deutsche Bank AG

was awarded nearly $200 million for assisting the probe, according to people familiar with the matter.

The payout is the largest ever by the Commodity Futures Trading Commission, which along with the Justice Department and U.K. Financial Conduct Authority settled enforcement actions against Deutsche Bank in 2015.

The CFTC’s announcement didn’t name the bank or the case, but the reward is related to the bank’s manipulation of the London interbank offered rate, or Libor, and similar widely used benchmarks, the people said.

The whistleblower’s application for an award was initially denied by the CFTC, but the U.S. derivatives regulator ultimately decided that the individual’s information was helpful after the whistleblower submitted a request for reconsideration.

“We’re very happy that the CFTC was able to reverse an earlier decision and turn around…

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