Tokyo Stock Exchange: To All Investors And Concerned Parties- Regarding Urgent Increase In System Capacity

In February this year, Tokyo Stock Exchange, Inc. (TSE) announced its plan for urgent measures to increase system capacity in an effort to ensure the trustworthiness of the market. Upon subsequent study, TSE has decided to implement the following measures in May.

TSE is committed to securing confidence in our market by looking into further system capacity augmentations in the future, and making several other improvements in market operation from the perspective of market users.

We sincerely ask for your kind understanding and cooperation.

Outline of the measures for increasing system capacity

Systems	Outline of improvement measures	Timing of implementation
Stock /CB Trading System	(1) Number of orders per day : 12 million [currently 9 million]	May 22, 2006
	(1)' Number of orders per day: 14 million	During 2006
Clearing System	(2) Number of executions per day (to be executed by TSE): 8.4 million [currently 5 million]	May 8, 2006
Market Information System	(3) Limit of messages per minute:30 thousand per minute (out of which 27 thousand will be related to stock information) [currently 20 thousand per minute (out of which 19 thousand are related to stock information. )	During 2006

With regards to the clearing system, TSE originally planned to increase the number of executions per day (to be executed by TSE) to 7 million. As a result of further study, however, TSE decided to implement the clearing system's capacity expansion earlier than planned commensurate with the stock/CB trading system's capacity expansion. TSE plans to determine the exact date for implementation of expansion of both the stock/CB trading system and the Market Information System as soon as possible.

This English version announcement is not an officially accurate translation of the original Japanese announcement. In the case where any differences may occur in the English version, the original Japanese announcement will prevail. TSE shall not accept any responsibility for damages caused by any errors, inaccuracies, misunderstandings or misspelling with regard to the translation of the announcement. This announcement may be used only for reference purposes. Tokyo Stock Exchange, Inc. maintains the right to claim compensation from violators for any damages it may suffer from the violation of these conditions.