Hiromi Yamaji named as new TSE chief in wake of worst outage Sorry, but your browser needs Javascript to use this site. If you're not sure how to activate it, please refer to this site: https://www.enable-javascript.com/ Kyodo Feb 23, 2021 Japan Exchange Group Inc. said Monday it has named Hiromi Yamaji, who heads its Osaka bourse unit, as the new president of the Tokyo Stock Exchange operator, which has been struggling to restore investor trust following an unprecedented full-day trading suspension. Yamaji, 65, will assume the post on April 1, replacing Akira Kiyota, the chief executive of Japan Exchange Group who currently doubles as head of Tokyo Stock Exchange Inc., after the worst outage in the bourse's history on Oct. 1 led to the resignation of then-President Koichiro Miyahara the following month.