The Tokyo Stock Exchange employee who is suspected of being involved in an insider trading case belonged to a division handling timely disclosure announcements by listed companies, informed sources said Thursday.

The employee in his 20s, who has been with the TSE for a few years, was removed from that assignment after the Securities and Exchange Surveillance Commission launched a compulsory investigation into the case in September, according to the sources.

The investigation, which covered related locations, including the employee's home, was launched on suspicion of financial instruments and exchange law violations.