The Tokyo Stock Exchange told Wednesday, that it would invest ¥62 billion for improving its trading systems. It happens after wrestling with a series problems in trading. The exchange, which numbers more than 2,300 companies and accounts for about 90% of stock trading in Japan, is under severe pressure to bolster its processing capacity after the problems. The exchange has detruncated its daily trading period by 30 minutes since Jan. 19. It happens after heavy trade orders nearly swamped its computer systems. It also faced a problem last year, when a trader, belongs to the Mizuho Securities, a unit of Mizuho Financial Group, was unable to stop a wrong order, leading to a loss of ¥41 billion, or $353 million, for the brokerage. The bourse said its president, Taizo Nishimuro, would continue to work as chairman and president, contingent on the approval of its shareholders at a meeting in June. Nishimuro replaced Takuo Tsurushima. It happens in December along with two other directors to take responsibility for the troubles.

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