REPORT ON THE EXERCISE OF WARRANTS NO.1/2003

Date : 03/06/2003 08:38 STECON : REPORT ON THE EXERCISE OF WARRANTS NO.1/2003 Ref: ST/010/2003/0008 June 2, 2003 Re: Report on the Exercise of Warrants No.1/2003 To: The President The Stock Exchange of Thailand Sino-Thai Engineering & Construction Public Company Limited would like to report the exercise of warrants (STECON-W) no.1 on May 30, 2003 As per following details: - Exercising ratio: 1 unit of warrant per 10 ordinary share - Exercising price: Baht 1 - Ordinary shares reserved to support the exercise: 170,000,000 shares - No. of warrant holders exercise: 19 - No. of warrants being exercised: 5,619,664 units - Ordinary shares resulted from the exercise: 56,196,640 shares - Money received from the exercise: Baht 56,196,640 - Total remaining warrants listed in the Stock Exchange of Thailand: 11,380,336 units. Please be informed accordingly. Yours sincerely, Mr. Woraphant Chontong (SVP.) Finance & Accounting Division