Ryusuke Otani will bow out after overseeing two whole months at RBS Securities Japan in which the unit did not have to plead guilty to any crimes.
Ryusuke Otani, chief executive of RBS Securities Japan, will probably step down by the end of the week, added the person, who spoke on the condition of anonymity because he was not authorized to speak publicly.
The resignation of Mr. Otani, a former Citigroup banker, follows moves by Japanese authorities to punish Royal Bank of Scotland over its role in the manipulation of the London interbank offered rate, or Libor.
The Securities and Exchange Surveillance Commission of Japan asked local regulators last week to issue a so-called administrative action against R.B.S., which is based in Edinburgh, after some of its traders attempted to alter a key benchmark rate for financial gain.
The Royal Bank of Scotland, in which the government holds a stake of about 81 percent after providing a bailout during the financial crisis, reached a $612 million settlement in February with American and British authorities in connection with the Libor scandal. As part of the agreement, the firm’s Japanese unit was required to plead guilty to criminal wrongdoing.