Mr Kenichi Watanabe, chief executive officer of Japan’s biggest brokerage, Nomura Holdings Inc, has announced his resignation here on Thursday, taking responsibility for a series of insider information leaks.

The company’s chief operating officer, Takumi Shibata, is also expected to resign following the scandal, Kyodo News Agency reported.

Mr Watanabe, 59, is expected to be succeeded by Koji Nagai, a 53-year-old president of Nomura Securities, which is part of the Nomura banking empire.

Earlier, several officials at the Nomura Securities were found to have leaked insider information to customers, including Chuo Mitsui Asset Trust and Banking Co., about public share offerings planned by Inpex Corp., Mizuho Financial Group Inc. and Tokyo Electric Power Co, the report said.

Nomura also confirmed the involvement of its officials in leaking inside information to its customers following an ongoing investigation by country’s financial regulators.

Watanabe, who served the company as CEO for four years, during which he and Shibata, oversaw the purchase of Lehman Brothers Holdings Inc.’s Asian and European businesses.

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