On 21 October 2021, the board of directors of China National Building Material Company Limited received a resignation letter from Mr. Cao Jianglin. Due to work adjustment, Mr. Cao applied to resign from the positions of Board chairman and executive director of the Company. Mr. Cao's resignation takes effective October 21, 2021. As such, Mr. Cao will no longer serve as the chairman of the Company's strategic steering committee, a member of the nomination committee, a member of the remuneration and performance appraisal committee, and an authorised representative of the Company under Rule 3.05 of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited, with effect from 21 October 2021. To ensure the normal functioning of the Board, at the Board meeting held on 21 October 2021, the Board considered and approved the resolutions authorising Mr. Chang Zhangli, an executive director of the Company, to exercise the Board chairman's powers; and appointing of Mr. Chang Zhangli as an Authorised Representative of the company. The term of office of Mr. Chang Zhangli in respect of the above authorized powers and appointed position commences from October 21, 2021.