China Oilfield Services Limited filed its monthly return to Hong Kong Exchanges and Clearing on 9 April 2026, confirming that no changes occurred in either authorised or issued share capital for the period ended 31 March 2026.

The company’s authorised share capital remained at 4.77 billion ordinary shares with a par value of RMB 1 each, split between 1.81 billion H-shares listed in Hong Kong and 2.96 billion A-shares listed in Shanghai.

Issued capital also stayed unchanged: • H-shares in issue stood at 1.81 billion, with no treasury shares recorded. • A-shares in issue totalled 2.96 billion, likewise with no treasury shares.

China Oilfield Services confirmed that its H-share public float continued to satisfy the 5 percent minimum threshold applicable to PRC issuers under Hong Kong Main Board Rule 13.32B.

No share options, warrants, convertible securities, or other share-issuance arrangements were outstanding or exercised during the month.

The submission, signed by Company Secretary Sun Weizhou, states that all statutory filings and listing rule requirements have been duly observed.