SUSPENDED TRADING AND LISTING STATUS TERMINATION OF STEC-W

SUSPENDED TRADING AND LISTING STATUS TERMINATION OF STEC-W Sino-Thai Engineering and Constrcution Public Co.,Ltd.(STEC) announced the maturity of the Warrants of Sino-Thai Engineering and Constrcution Public Co.,Ltd (STEC-W) with exercise notice period starting from May 15, 2007 until May 29, 2007 and the exercise date to subscribe to its common shares on May 30, 2007. The closure of the warrant registration is scheduled from May 10, 2007, beginning at noon, until May 30, 2007. Therefore, to comply with the clearing and settlement system, STEC has requested the SET to suspend trading of its warrants (STEC-W) effective from May 4, 2007 until May 30, 2007. (Detail as in STEC 's news dated on April 26, 2007) By virtue of Clause 5(6) of the SET's Rules, Conditions and Procedures for the Temporary Prohibition of Trading of Listed Securities, issued on February 9,1995, the SET will suspend trading on STEC-W from May 4, 2007 until May 30, 2007 as requested. In addition, such warrants will no longer be listed securities on the SET since May 31, 2007 onwards.