China National Building Material Company Limited (CNBM) has issued a proxy form to its H-shareholders for a class meeting scheduled on 29 April 2026 at 2:30 p.m. (or immediately after the 2025 AGM) at Tower 2, Guohai Plaza, No. 17 Fuxing Road, Haidian District, Beijing.

Key agenda • Special Resolution: Authorisation for the Board to secure a general mandate to repurchase the company’s H Shares. The detailed terms of the mandate are set out in the circular dated 31 March 2026.

Voting arrangements • Each registered H-shareholder, holding H Shares of RMB1.00 par value, may appoint one or more proxies. • If no voting instruction is marked on the proxy form, the proxy may vote at his or her discretion. • Any alteration on the proxy form must be initialled by the signer.

Deadlines and procedural details • Signed proxy forms, together with relevant authorisation documents, must reach the company’s Hong Kong H-share registrar—Tricor Investor Services Limited, 17/F, Far East Finance Centre, 16 Harcourt Road—no later than 2:30 p.m. on 28 April 2026. • Shareholders or proxies attending the meeting must present proof of identity; corporate representatives must also provide board resolutions or equivalent authorisations.

Registration information • Only the first-named joint holder is entitled to vote. • The company’s H-share registrar can be contacted on (+852) 2980 1333 or via email at cnbm3323-ecom@vistra.com for administrative enquiries.

The meeting will decide whether the Board receives the authority to execute H-share buy-backs, granting CNBM flexibility in capital-management initiatives subject to statutory limits and subsequent shareholder oversight.