Bangkok--23 May--SET Mr.Supakit Jirapraditkul, the Stock Exchange of Thailand (SET) Senior Vice President, revealed that the SET has revised the regulations regarding irregular securities trading to lower investors’ risks and the entire trading system. The SET has disclosed the revised rules, which will come into effect on July 1, 2008, while all member companies are requested to study and clarify the new set of regulations with investors thoroughly. Under the new rules, the SET requires that securities (comprising securities listed on the SET, the mai and warrants) with high turnover ratio in trading announced on the Securities and Exchange Commission (SEC)’s turnover list, together those with additional conditions defined by the SET, must be traded through cash balance accounts at least 3 weeks instead of the prohibition from net settlement trading and margin loans trading. Such additional conditions are as follows: 1. Common shares traded on either SET or mai that have turnover ratio of 50% or higher with P/E Ratio of 50 times or over or net loss. They must also have an average daily trading value of THB100 million (about USD3.1 million) or more. 2. Warrants that record turnover ratio of 100% or higher and a price premium over 20% above the underlying security and average daily trading value of THB100 million (about USD3.1 million) or more. The SET will announce the list of securities that must be traded through cash balance accounts on the last trading day of each week, or on Friday after the SEC has announced the turnover list on website www.sec.or.th. The SET’s announcement will be disseminated after trading session via the SET Smart system. This announcement will come into effect on the following working day. The cash balance account refers to the conditions under which, before buying any security, investors must make a full deposit of the value of the securities trading that they intend to buy with member brokers, or have an agreement that allow brokers to debit the amount equivalent to the securities trading value they intend to buy from their savings accounts or have an agreement with brokers to transfer the same amount of money to brokers before buying securities. For more information, please call SET Call Center at 0 2229222.