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The proxy for the first H Share Class Meeting in 2025 to be held on 31 December 2025

INVESTMENT IN AND DEVELOPMENT OF "HIGH-END PETROLEUM PIPES INTELLIGENT PROCESSING LINE PROJECT"

PROPOSED AMENDMENTS TO ARTICLES OF ASSOCIATION

(1) PROPOSED AMENDMENTS TO ARTICLES OF ASSOCIATION(2) PROPOSED AMENDMENTS TO THE RULES OF PROCEDURE FOR SHAREHOLDERS MEETINGS(3) PROPOSED AMENDMENTS TO THE RULES OF PROCEDURE FOR MEETINGS OF BOARD OF DIRECTORS

Monthly Return of Equity Issuer on Movements in Securities

Monthly Return of Equity Issuer on Movements in Securities

POLL RESULTS OF EXTRAORDINARY GENERAL MEETING HELD ON 3 NOVEMBER 2025 ABOLISHMENT OF THE SUPERVISORY COMMITTEE AMENDMENTS TO THE ARTICLES OF ASSOCIATION AND ITS ANNEXES AND ELECTION OF EMPLOYEE REPRESENTATIVE DIRECTOR

List of Directors and their Roles and Functions

Articles of Association

Rules of Procedure for shareholders' meetin

Rules of Procedure for Board of Directors

UNAUDITED 2025 THIRD QUARTERLY REPORT

PROVISION FOR ASSET IMPAIRMENT AND ITS REVERSAL FOR FIRST THREE QUARTERS IN 2025

UNUSUAL PRICE MOVEMENT OF A SHARES OF THE COMPANY

UNUSUAL PRICE MOVEMENT OF A SHARES OF THE COMPANY

(1) PROPOSED AMENDMENTS TO ARTICLES OF ASSOCIATION AND (2) ABOLISHMENT OF THE SUPERVISORY COMMITTEE

(1) ADJUSTMENT OF CORPORATE GOVERNANCE STRUCTURE AND AMENDMENTS TO ARTICLES OF ASSOCIATION AND ITS ANNEXES AND (2) NOTICE OF THE EGM

NOTICE OF EXTRAORDINARY GENERAL MEETING

Proxy form for the Extraordinary General Meeting to be held on 3 November 2025

DATE OF BOARD MEETING