On 25 June 2026, China Oil And Gas Group Limited (“CHINA OIL & GAS”) announced that the English and Chinese versions of the Special General Meeting (SGM) circular and related proxy form have been published on both the company website (www.hk603.com) and HKEXnews (www.hkexnews.hk).

Key points from the notice:

1. Availability of documents • Shareholders who previously elected to receive printed materials will find the circular and proxy form enclosed with the mailed package. • Those who experience difficulties accessing the online documents may request free printed copies through the company’s Hong Kong share registrar, Computershare Hong Kong Investor Services Limited, by post or by email (ecomm@hk603.com).

2. Electronic dissemination policy • In line with Rule 2.07A of the Listing Rules, effective 31 December 2023, CHINA OIL & GAS has fully adopted paperless distribution for all future corporate communications. • Both English and Chinese versions of every future document—annual and interim reports, meeting notices, circulars, and proxy forms—will be provided exclusively on the company and HKEXnews websites unless shareholders specifically request otherwise.

3. Shareholder action required • To receive timely electronic notifications, shareholders are encouraged to supply a valid email address by scanning the personalised QR code on the reply form or by returning the completed form to the share registrar. • Without a functional email on record, shareholders must monitor the company and HKEXnews websites for new publications; only actionable corporate communications will be dispatched in hard copy. • Any request for printed materials will remain valid for one year from the instruction date.

4. Contact information • Enquiries may be directed to the company’s hotline at (852) 2200 2222 during business hours, Monday to Friday (excluding Hong Kong public holidays).

The notice was authorised by Company Secretary Chan Yuen Ying, Stella, on behalf of the board of CHINA OIL & GAS.