Report on the Summary of the Exercise of STEC- W No.8/2004

Ref: ST/010/2004/0079 January 3rd, 2005 Re: Report on the Exercise of Warrants No.8/2004 To: The President The Stock Exchange of Thailand Sino-Thai Engineering & Construction Public Company Limited would like to report the exercise of warrants (STEC-W) No.8 on December 30th, 2004 as per following details: - Exercising ratio: 1 unit of warrant per 1 ordinary share - Exercising price: Baht 1 per share - Ordinary shares reserved to support the exercise: 4,255,050 shares - No. of warrant holders exercise: 3 - No. of warrants being exercised at No.8/2004: 18,400 units - Ordinary shares resulted from the exercise at No.8/2004: 18,400 shares - Money received from the exercise at No.8/2004: Baht 18,400 - Total remaining warrants listed in the Stock Exchange of Thailand: 4,236,650 units Please be informed accordingly. Yours sincerely, Ms. Anilrat Nitisaroj Vice President - Investor Relations