The home of a former deputy head of the Osaka Securities Exchange was searched Friday over allegations that he manipulated the market for four years through 2000.

Osaka district prosecutors suspect 66-year-old Takuo Noguchi, who lives in Tokyo, repeatedly falsified stock option dealings through Osaka-based Japan Electronic Securities Co., which was affiliated with the OSE at the time, as well as through other firms, investigative sources said.

In an unusual move for investigators, the prosecutors and the Securities and Exchange Surveillance Commission also searched offices at the exchange after it closed in the afternoon.