Report on the application of increased capital

ST.010/2006/0052 July 31st, 2006 Subject: Report on the application of increased capital Attention: The President Stock Exchange of Thailand Sino-Thai Engineering and Construction Public Company Limited, ("The Company"), would like to inform that from December 2005 to June 2006, the company received capital from the exercise of STEC-W and STEC-W2 totaling Baht 758,200. The company has objective to use this capital increase to support the company business operation. Details of warrant exercise are as follows: Exercise Date Dec 30 2005 Type of Warrants STEC-W STEC-W2 Number of Warrants(Units) 6,600 0 Number of Shares (Shares) 6,600 0 Exercising Price (Unit:Baht) 1 : 1 1 : 8.50 Total (Baht) 6,600 0 Exercise Date Mar 30 2006 Type of Warrants STEC-W STEC-W2 Number of Warrants(Units) 71,600 80,000 Number of Shares (Shares) 71,600 80,000 Exercising Price (Unit:Baht) 1 : 1 1 : 8.50 Total (Baht) 71,600 680,000 Exercise Date Jun 30 2006 Type of Warrants STEC-W STEC-W2 Number of Warrants(Units) 0 0 Number of Shares (Shares) 0 0 Exercising Price (Unit:Baht) 1 : 1 1 : 8.50 Total (Baht) 0 0 Total 758,200 Baht The company has used the capital increase to support the company business operation which comply with the objective approved by its shareholders. It is therefore informed for your acknowledgement and dissemination to the public and other investors. Yours sincerely, Mr. Woraphant Chontong SEVP. Financial and Administration Division