Shares in Japan Exchange Group Inc., a merger of Japan\'s two biggest stock exchange markets, went public Friday on the Tokyo Stock Exchange\'s first section. The stock of the new exchange operator, which became Japan\'s largest in terms of market value of the firms listed after the merger, fetched an opening price of 3,740 yen and ended the morning session at 3,885 yen. Shares in the exchange group, which was established on Tuesday with the merger of Tokyo Stock Exchange Group Inc. (TSE) and Osaka Securities Exchange Co.(OSE), are traded on both TSE\'s first section and OSE\'s Jasdaq market. \"We aim to become the No. 1 market in Asia, attracting investors from around the world by developing attracting products, \" said Atsushi Saito, head of the new group.