ข่าวแจ้งตลาดหลักทรัพย์

-TRANSLATION - No. 1000/086/2006 April 5, 2006 Subject : Result of the Fifth Voluntary Conversion of Depository Receipt for Common Shares of The Bangchak Petroleum Public Company Limited (BCP-DR1) on April 5, 2006 Attention : President of The Stock Exchange of Thailand Reference : Terms and Conditions of the Depository Receipt for Common Shares of The Bangchak Petroleum Public Company Limited According to the Terms and conditions of Depository Receipt for Common Shares of The Bangchak Petroleum Public Company Limited (BCP-DR1) with respect to the rights of Voluntary Conversion, the BCP-DR1 Holders have the right to wholly or partly convert BCP-DR1 to Common Shares. The Voluntary conversion may be made on quarterly basis on the 5th day of January,April,July,and October each year, of which, the Fifth Voluntary Conversion date is April 5, 2006. In addition, the BCP-DR1 holders have to notify the intention for the Fifth Voluntary Conversion during March 29 - April 4, 2006 via Bualuang Securities Public Company Limited, the Agent of the Company for Accepting Exercise of the Conversion of BCP-DR1. The Company would like to inform that on April 5, 2006, there was no BCP-DR1 holder converted their Depository Receipt to Common Shares of BCP. Therefore, the Company had still remained the depository Receipts of 520,056,055 units. Please be informed accordingly. Yours sincerely, -signed- (Patiparn Sukorndhaman) Senior Executive Vice President Accounting and Finance Office of Secretary to Board of Directors Tel: 0-2335-4584 CC: 1. Managing Director, Siam DR Co., Ltd. 2. Managing Director, Thailand Securities Depository Co, Ltd. 3. Managing Director, Bualuang Securities Public Company Limited