Prosecutors arrested an employee of Nihon Keizai Shimbun Inc. on Tuesday afternoon on suspicion of insider trading, investigative sources said.
The arrest of Kazumasa Sasahara, 31, who works in the advertising section at the business newspaper's Tokyo head office, followed the filing of a criminal complaint against him by the Securities and Exchange Surveillance Commission with the Tokyo District Public Prosecutor's Office earlier in the day.
Sasahara admitted to having engaged in insider trading, the sources said.