Notification of Board Meeting No. 4/2026 Resolutions on Material&Related Party Transaction for Conditional Assignment of Trade Accounts Receivable Agreement Schedule of EGM No.1/2026(Revise)

Schedule of Shareholders' meeting Subject : Schedule of Extra-General Meeting of Shareholders Date of Board resolution : 10-Nov-2026 Shareholder's meeting date : 23-Dec-2026 Beginning time of meeting (hh:mm) : 13 : 30 Record date for the right to attend the : 26-Nov-2026 meeting Ex-meeting date : 25-Nov-2026 Significant agenda item (Update) : - Acquisition and disposition of assets - Connected transaction Type of meeting : Physical meeting Venue of the meeting : Grand Hall room,28th Floor Bangkok Club, Sathorn City Tower Building Agenda Item : 1 Agenda Detail (Update) : To consider and certify the minutes of the Annual General Meeting of Shareholders 2025 Type (Update) : To Consider and approve Board's Resolution : It was deemed appropriate to propose to the Extraordinary General Meeting of Shareholders to adopt the Minutes of the Annual General Meeting of Shareholders No. 39/2026 held on April 29th, 2026 Agenda Item : 2 Agenda Detail (Update) : To consider and approve the entry into the Conditional Assignment of Trade Accounts Receivable Agreement with Golden Dragon Precise Copper Tube Group Inc., which is a material transaction and a connected transaction in the category of provision of financial assistance to a connected person which is a juristic person in which the Company is not a shareholder. Type : To Consider and approve Board's Resolution (New) : Resolved to propose to the Extraordinary General Meeting of Shareholders No. 1/2026, to consider and approve the entry into a material transaction and a connected transaction. Agenda Item (New) : 3 Agenda Detail (New) : To consider and approve the entry into the Conditional Assignment of Trade Accounts Receivable Agreement with Golden Dragon Precise Copper Tube Group Inc., which is a material transaction. Type (New) : To Consider and approve Board's Resolution (New) : Resolved to propose to the Extraordinary General Meeting of Shareholders No. 1/2026, to consider and approve the entry into a material transaction. Agenda Item (New) : 4 Agenda Detail (New) : To consider other agenda Type (New) : To Consider and approve ______________________________________________________________________ Connected transaction To consider and approve the entry into the Conditional Assignment of Trade Accounts Receivable Agreement with Golden Dragon Precise Copper Tube Group Inc., which is a material transaction and a connected transaction in the category of provision of financial assistance to a connected person which is a juristic person in which the Company is not a shareholder. ______________________________________________________________________ Acquisition or disposition of assets To consider and approve the entry into the Conditional Assignment of Trade Accounts Receivable Agreement with Golden Dragon Precise Copper Tube Group Inc., which is a connected 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.