The head of the parent of the Tokyo bourse operator has urged Toshiba Corp. to swiftly disclose the outcome of its investigation into governance issues, following an independent probe showing the industrial conglomerate colluded with the government to block foreign activist investors.

"We ask Toshiba to conduct a prompt reinvestigation and disclose its findings in a timely manner," Akira Kiyota, CEO of Japan Exchange Group Inc., said at a news conference Wednesday, calling on the Japanese conglomerate listed on the Tokyo Stock Exchange to restore the trust of investors and other stakeholders.

A probe by lawyers revealed last week that Toshiba sought the industry ministry's help in blocking proposals by foreign activist investors and concluded that a shareholders meeting held last year was not conducted fairly.