Japanese regulators are scrutinizing Deutsche Bank over concerns that its employees broke Japan's anti-bribery rules by providing corporate entertainment to pension fund executives.
Japan's securities watchdog, the Securities and Exchange Surveillance Commission, is investigating whether members of Deutsche's pension solutions group in Tokyo spent too much money entertaining clients.
Pension fund managers are involved in managing Japan's national pension scheme and are legally seen as public officials.
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Deutsche said that it was "fully co-operating" with Japanese regulators. The bank raised concerns with the regulator itself earlier this year following an internal review of its procedures.
The corporate entertainment under review, details of which were not released, took place several years ago.
"Deutsche Bank is committed to meeting strict standards of compliance with bank policy and regulation," the company said in a statement. "Where improper conduct is found, we address it responsibly and take appropriate action."
The SESC could not be immediately reached for comment.