Letter No. : MASTEC-002-02-2026 Subject : (Amend) Determination of the Date and Agenda for the 2026 Annual General Meeting of Shareholders, the Record Date for the Right to Attend the Meeting and Receive Dividends, and the Dividend Payment. To : The President of the Stock Exchange of Thailand ______________________________________________________________________ Schedule of Shareholders' meeting Subject : Schedule of Annual General Meeting of Shareholders Date of Board resolution : 26-Feb-2026 Shareholder's meeting date : 24-Apr-2026 Beginning time of meeting (hh:mm) : 10 : 00 Record date for the right to attend the : 13-Mar-2026 meeting Ex-meeting date : 12-Mar-2026 Significant agenda item : - Cash dividend payment - Changing / renewal of the term of the director(s) Type of meeting : Electronic meeting Venue of the meeting : Electronic meeting Agenda Item : 1 Agenda Detail : To consider and adopt the Minutes of the Extraordinary General Meeting of Shareholders No. 1/2025 Type : To Consider and approve Board's Resolution : The Board of Directors has considered and is of the opinion that the said minutes were accurately and completely recorded. Therefore, it is recommended that the shareholders adopt the aforementioned minutes of the meeting Agenda Item : 2 Agenda Detail : To acknowledge the reports of board of directors and operating results for the year ended 31 December 2025 Type : To acknowledge Board's Resolution : The Board of Directors has considered and is of the opinion that the shareholders should acknowledge the Company's operating results regarding the performance in the past year, as well as the recommendations for future business operations Agenda Item : 3 Agenda Detail : To consider and approve the financial statements for the year ended 31 December 2025 Type : To Consider and approve Board's Resolution : The Board of Directors has considered and is of the opinion that the shareholders should approve the Company's financial statements for the fiscal year ended December 31, 2025, which have been reviewed by the Audit Committee and the Board of Directors, as well as audited and expressed an opinion by the auditor. Furthermore, the shareholders should acknowledge the auditor's report. Agenda Item : 4 Agenda Detail : To consider and approve the allocation of profit as legal reserve and dividend payment for the year 2025 Type : To Consider and approve Board's Resolution (Update) : The Company's operating results for the 2025 fiscal year (from January 1, 2025, to December 31, 2025) reported a net profit of Baht 22,886,236. The Board of Directors has considered and is of the opinion that the shareholders should approve the allocation of the 2025 net profit as a legal reserve in the amount of Baht 1,160,000.00, representing 5.07% of the annual net profit. Consequently, as of December 31, 2025, the Company has retained earnings of Baht 49,240,808 and a legal reserve of Baht 20,260,000, representing 6.75% of the Company's registered capital. The Board of Directors proposes that the meeting consider and approve the dividend payment for the year 2025 in cash at the rate of Baht 0.14 per share, totaling Baht 42,000,000. This dividend is derived from the 2025 annual net profit and the Company's retained earnings, which is in accordance with the Company's dividend policy. The aforementioned dividend will be paid from the net profit subject to corporate income tax at the rate of 20%. Individual shareholders are entitled to a dividend tax credit at the rate of 20/80 of the dividend, pursuant to the criteria set forth under Section 47 bis of the Revenue Code. The Record Date to determine the list of shareholders entitled to receive the dividend is scheduled for March 13, 2026, and the dividend payment is scheduled to be made on May 15, 2026. However, the said dividend payment remains uncertain as it is subject to approval from the Annual General Meeting of Shareholders. Agenda Item : 5 Agenda Detail : To consider and approve the appointment of directors in replacement of those who must retire by rotation Type : To consider and approve the appointment of directors Board's Resolution : The Board of Directors (excluding the nominated directors who abstained from voting) has considered and is of the opinion that the shareholders should approve the re-appointment of the following 2 individuals to their original positions for another term, as they possess extensive knowledge and competence and have consistently performed their duties with excellence: Mr. KAMTORN KUNANOPPARAT: Company Director (Proposed for re-appointment to the same position for another term). Ms. ONCHULEE LAWSMITHIKUL: Company Director / Audit Committee / Independent Director (Proposed for re-appointment to the same positions for another term). Agenda Item : 6 Agenda Detail : To consider and approve the directors' remuneration for the year ended 31 December 2026 Type : To Consider and approve Board's Resolution : The Board of Directors has considered and is of the opinion that the shareholders should approve the directors' remuneration for the year 2026. The proposed remuneration is considered appropriate and consistent with the directors' duties and responsibilities, at a rate comparable to other listed companies of a similar business size. The details are as follows: 1) Meeting Allowance: Chairman of the Board: Baht 25,000.00 per meeting Director (each): Baht 20,000.00 per meeting Chairman of the Audit Committee: Baht 20,000.00 per meeting Audit Committee Member (each): Baht 15,000.00 per meeting Chairman of the Nomination and Remuneration Committee: Baht 15,000.00 per meeting Nomination and Remuneration Committee Member (each): Baht 10,000.00 per meeting Chairman of the Corporate Governance and Sustainability Committee: Baht 15,000.00 per meeting Corporate Governance and Sustainability Committee Member (each): Baht 10,000.00 per meeting Chairman of the Risk Management Committee: Baht 15,000.00 per meeting Risk Management Committee: Bath 10,000.00 per meeting Note: Directors who hold an executive position or are employees of the Company are not entitled to receive the aforementioned meeting allowance. 2) Directors' Bonus: The bonus for the Board of Directors depends on the Company's operating results each year, totaling no more than Baht 1,500,000.00. The Chairman of the Board is authorized to allocate this amount to each director. Notes: For directors who do not serve a full term, the payment shall be made pro rata to their period of directorship in that year. Directors who are employees of the Company are not entitled to receive a bonus in their capacity as a director. 3) Other Remuneration Components: There are no other remuneration components proposed for approval, whether in monetary or non-monetary form. Agenda Item : 7 Agenda Detail : To consider and approve the appointment of auditor and fix his/her remuneration for the year ended 31 December 2026 Type : To Consider and approve Board's Resolution : The Board of Directors has considered and is of the opinion that the shareholders should approve the appointment of the auditors for the year 2026 and the determination of the audit fee as proposed by the Board of Directors. This proposal has been endorsed by the Audit Committee, which considers the auditors to be independent and without any relationship or interest with the Company's directors, executives, major shareholders, or any persons related to such individuals. Furthermore, the auditors have consistently demonstrated excellent performance in auditing financial statements. Agenda Item : 8 Agenda Detail : To consider other agenda Type : To acknowledge Board's Resolution : The Board of Directors is of the opinion that this agenda item should be included in every shareholders' meeting to provide an opportunity for shareholders to make inquiries, engage in discussions, and/or provide recommendations to the Board of Directors and/or the Management of the Company. However, pursuant to the second paragraph of Section 105 of the Public Limited Companies Act B.E. 2535 (1992), it is stipulated that shareholders holding shares amounting to not less than one-third of the total number of shares sold may request the meeting to consider matters other than those specified in the notice of the meeting. The Board of Directors, therefore, deems it appropriate to include this agenda to provide an opportunity for shareholders who wish to propose matters for consideration other than those determined by the Board for this meeting. ______________________________________________________________________ Dividend payment / Omitted dividend payment Subject : Cash dividend payment Date of Board resolution : 26-Feb-2026 Type of dividend payment : Cash dividend payment Record date for the right to receive : 13-Mar-2026 dividends Ex-dividend date : 12-Mar-2026 Payment for : Common shareholders Cash dividend payment (baht per share) : 0.14 Par value (baht) : 1.00 Payment date : 15-May-2026 Paid from : Operating period from 01-Jan-2025 to 31-Dec-2025 and retained Earnings Remark : The right to receive dividend, as the case maybe, is uncertain as it has not yet been approved by shareholders. ______________________________________________________________________ Change of director/Executive Re-election Director Name : Mr. KAMTORN KUNANOPPARAT Position in company (1) : DIRECTOR Effective Date (1) : 17-Nov-2000 ______________________________________________________________________ Change of director/Executive Re-election Director Name : Miss ONCHULEE LAWSMITHIKUL Position in company (1) : INDEPENDENT DIRECTOR Effective Date (1) : 12-May-2015 Position in company (2) : AUDIT COMMITTEE Effective Date (2) : 12-May-2015 ______________________________________________________________________ Auditors Appointment No : 1 Auditor Name : Miss NONGRAM LAOHAAREEDILOK CPA License No. : 4334 Accounting and Audit firm : AST MASTER CO., LTD. Audit End Date : 31-Dec-2026 No : 2 Auditor Name : Ms. SUNANTA KUMSUK CPA License No. : 8207 Accounting and Audit firm : AST MASTER CO., LTD. Audit End Date : 31-Dec-2026 No : 3 Auditor Name : Ms. CHAMAPORN RODLOYTUK CPA License No. : 9211 Accounting and Audit firm : AST MASTER CO., LTD. Audit End Date : 31-Dec-2026 No : 4 Auditor Name : Ms. PAKAMON LAOHAARREEDILOK CPA License No. : 11499 Accounting and Audit firm : AST MASTER CO., LTD. Audit End Date : 31-Dec-2026 ______________________________________________________________________ More detail : The Company provided the opportunity for minority shareholders to propose agenda items for the 2026 Annual General Meeting of Shareholders and to nominate qualified candidates for election as directors in advance. This nomination period was initially open from December 9, 2025, to February 15, 2026. Details regarding the criteria and procedures were disclosed on the Company's website (https://www.massteclink.com/) and through the Stock Exchange of Thailand's information system (SET Link). Upon the expiration of the specified period, no minority shareholders proposed any agenda items or nominated any candidates for directorship. The Company will disclose the details of the 2026 Annual General Meeting of Shareholders, the meeting agenda, procedures for attending the meeting, voting methods, and instructions for using the electronic meeting system (e-Meeting). This information will be available to shareholders via the Stock Exchange of Thailand's information system (SET Link) and on the Company's website (https://www.massteclink.com/) starting from March 25, 2026, onwards. For any inquiries, please contact the Investor Relations Department at Tel: 02-942-1433 or through any of the channels specified in the Notice of the 2026 Annual General Meeting of Shareholders. ______________________________________________________________________ The company hereby certifies that the information above is correct and complete. Signature _________________ ( Mr.DUSSADEE MEECHAI ) DIRECTOR Authorized person to disclose information Signature _________________ ( Mr.KAMTORN KUNANOPPARAT ) DIRECTOR Authorized person to disclose information ______________________________________________________________________ Investor Relations 02-942-1433 ______________________________________________________________________ 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.