The mandatory conversion of BCP-DR1

1600/020/2004 February 9, 2004 Subject : The mandatory conversion of BCP-DR1 Attention : President of The Stock Exchange of Thailand As the investors have asked for the details of the mandatory conversion, The Bangchak Petroleum Plc. would like to report the mandatory conversion condition of BCP-DR1 on behalf of Siam DR Co., Ltd., for the better understanding of the investors as follow : After 2 years starting from the listed date of BCP-DR1 (4th February 2006), if the price of BCP-DR1 is higher than 160% of offering price for 15 consecutive trading days (160% of 13 Baht is 20.80 Baht), all BCP-DR1 will be automatically converted into BCP's common shares Therefore, if the price of BCP-DR1 before 4th February 2006 is higher than 20.80 Baht per DR, the Company will not exercise the mandatory conversion, so the investors still receive the capital protected from the Ministry of Finance as usual. Please be informed accordingly. Sincerely yours, (Watcharapong Saisuk) Assistant Vice President Corporate Planning Office Corporate Planning Office Tel : 0-2335-4583