China National Building Material Company Limited (CNBM) has issued a proxy form for its Domestic Shareholders’ Class Meeting scheduled for 3:00 p.m. on Wednesday, 29 April 2026, at Tower 2, Guohai Plaza, No. 17 Fuxing Road, Haidian District, Beijing. The meeting will commence immediately after the conclusion of the H-shareholders’ class meeting.

The sole agenda item is a special resolution authorising the Board with a general mandate to repurchase H Shares. Details of the mandate are set out in the circular dated 31 March 2026.

Domestic shareholders may appoint one or more proxies to attend and vote. Completed proxy forms—and any corresponding power of attorney—must reach the Secretariat of the Board no later than 3:00 p.m. on Tuesday, 28 April 2026. Completion and return of the proxy form will not preclude shareholders from attending and voting in person.

Contact details for submission and enquiries: • Address: Tower 2, Guohai Plaza, No. 17 Fuxing Road, Haidian District, Beijing • Telephone: (+86) 10 6813 8220 • Facsimile: (+86) 10 6813 8388

Time references in the notice adhere to Hong Kong time.