Report on the Summary of Exercise Warrants No.7/2004

Ref: ST/010/2004/0067 October 1st, 2004 Re: Report on the Exercise of Warrants No.7/2004 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.7 on September 30, 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: 4,353,050 shares - No. of warrant holders exercise: 4 - No. of warrants being exercised: 98,000 units - Ordinary shares resulted from the exercise: 98,000 shares - Money received from the exercise: Baht 98,000 - Total remaining warrants listed in the Stock Exchange of Thailand: 4,255,050 units Please be informed accordingly. Yours sincerely, Mr. Woraphant Chontong (SVP.) Finance & Accounting Division