Nomura Holdings Inc.'s chief executive officer will take a pay cut to assume responsibility for improper handling of stock market information by employees, the latest setback for the struggling securities firm.

CEO Koji Nagai will forgo 30 percent of his salary for three months, the firm said after finding that a researcher at an affiliate shared information on potential changes to the Tokyo Stock Exchange sections inappropriately.

The Financial Services Agency plans to order the brokerage to improve internal controls, a person with knowledge of the matter said earlier, in what will be the first such action against Nomura since 2012.