Notification of Resolutions of the Board of Directors Meeting Re the Formation of the Joint Venture of Olefins and Polyolefins in Thailand and the Convening of the Extraordinary General Meeting of Shareholders No. 1/2026

Schedule of Shareholders' meeting Subject : Schedule of Extra-General Meeting of Shareholders Date of Board resolution : 28-Oct-2026 Shareholder's meeting date : 03-Dec-2026 Beginning time of meeting (hh:mm) : 09 : 00 Record date for the right to attend the : 11-Nov-2026 meeting Ex-meeting date : 10-Nov-2026 Significant agenda item : - Acquisition and disposition of assets Type of meeting : Electronic meeting Venue of the meeting : Electronic meeting Agenda Item : 1 Agenda Detail : To Consider and Approve the Formation of the Joint Venture of Olefins and Polyolefins Type : To Consider and approve Board's Resolution : The Board of Directors resolved to endorse the Company to propose the transaction for approval at the company's extraordinary general meeting of shareholders. Agenda Item : 2 Agenda Detail : Any other business Type : To Consider and approve ______________________________________________________________________ Acquisition or disposition of assets The Transaction is classified as a material transaction by the Company under the Notification of the Capital Market Supervisory Board No. TorChor. 45/2568 Re: Rules on Material Transactions dated 19 December 2025 (the "Notification on Material Transactions"). The highest transaction value of the Transaction is equivalent to 23.2 percent as calculated on the basis of the Net Asset Value based on the (i) the Company's consolidated financial statements as of 30 June 2026, reviewed by its auditor, (ii) the relevant consolidated pro-forma financial information of TPE and TPE In-Scope Businesses as of 30 June 2026, and (iii) the value of consideration determined in connection with the Transaction which exceeds 10 percent . Therefore, the Company must comply with the requirement under the Notification on Material Transactions before entering into the Transaction. ______________________________________________________________________ This announcement was prepared and disseminated by listed company or issuer through the electronic system which is provided for the purpose of dissemination of the information and related documents of listed company or issuer to the Stock Exchange of Thailand only. The Stock Exchange of Thailand has no responsibility for the correctness and completeness of any statements, figures, reports or opinions contained in this announcement, and has no liability for any losses and damages in any cases. In case you have any inquiries or clarification regarding this announcement, please directly contact listed company or issuer who made this announcement. If you would like to see the full details of this information, please click view "full details" in attached file.