Japan Exchange CEO Atsushi Saito

Japan Exchange CEO Atsushi Saito

Kiyoshi Ota/Bloomberg

Atsushi Saito, chief executive officer of Japan Exchange Group Inc., is seen on Jan. 4, 2013. “In Japan, our market share is already more than 90 percent so we would need to look overseas” said Saito, who was in London speaking at the ICMA Japan Securities Summit.