REQUEST FOR COMPANY'S SECURITIES CATEGORY TRANSFERRED

Our Ref ST 2001 0204 May 16 2001 Subject Request for Companys securities category transferred Attention The President The Stock Exchange of Thailand References 1 ST 2000 0410 dated September 5 2000 Subject Approval of Business Rehabilitation Plan of Sino-Thai Engineering & Construction Plc 2 ST 2000 0507 dated November 22 2000 Subject Request for SP Sign lifting on STECON securities 3 ST 2000 0525 dated December 18 2000 Subject Report on Company Business Rehabilitation terminated 4 AC ST117 2544 dated May 15 2001 Subject Company Financial Statements as of March 31 2001 As the Central Bankruptcy Court granted the order for approval of STECON Business Rehabilitation Plan since September 4 2000 the Company has completed major reorganization steps of the plan until filing the request for SP sign lifting on company securities to SET on November 22 2000 and the Court granted the order for Company Rehabilitation terminated on December 15 2000 Operating Performance for quarter 1 2001 indicated STECON capability to restore company normal operation as the company made profits from its core business, had gross margin and net profits at the significance amount and had shareholders equity increase Refer to the performance mentioned above, we would like to ask the SET to consider transferring STECON securities from REHABCO category to company normal category (property development) and allow company securities to be traded under this category onward For your further consideration. Yours sincerely ( Mr. Woraphant Chontong ) Senior Vice President Finance and Account