CHK Oil Limited — Proxy Solicitation & Information Statement 2026

Jun 3, 2026

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this notice, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this notice.

中国石油有限公司*

CHK OIL LIMITED

(Incorporated in Bermuda with limited liability)

(Stock Code: 632)

SUPPLEMENTAL NOTICE OF ANNUAL GENERAL MEETING

Reference is made to the notice of annual general meeting for the year ended 31 December 2025 (the "AGM") of CHK Oil Limited (the "Company") dated 23 April 2026 (the "Original Notice") which sets out the time and the venue of the AGM and contains resolutions to be proposed at the AGM for shareholders' approval.

SUPPLEMENTAL NOTICE IS HEREBY GIVEN THAT the AGM will be held as originally scheduled at Units 2617-18, 26/F, Mira Place Tower A, No. 132 Nathan Road, Kowloon, Hong Kong, on Friday, 26 June 2026, at 11:00 a.m. for the purpose of considering, and if thought fit, passing the following resolution in addition to the resolutions set out in the Original Notice:

ORDINARY RESOLUTION

1. To consider and approve the appointment of HLB Hodgson Impey Cheng Limited as the auditor of the Company (to replace Forvis Mazars CPA Limited) to hold office until conclusion of the next annual general meeting, and to authorize the board of Directors (the "Board") to fix its remuneration.

By Order of the Board

CHK Oil Limited

Yu Zhibo

Chairman and Executive Director

Hong Kong, 3 June 2026

• For identification purpose only

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Notes:

1. Details of the above resolution are set out in the supplemental circular of the Company dated 3 June 2026 (the “Supplemental Circular”). Save for the inclusion of the newly proposed resolution and withdrawal of the ordinary resolution numbered 3, there are no other changes to the resolutions set out in the Original Notice of AGM dated 23 April 2026. Please refer to the Original Notice and the circular of the Company for the AGM dated 23 April 2026 (the “First AGM Circular”) for details of the other resolutions to be passed at the AGM and other relevant matters.

2. A supplemental form of proxy (the “Supplemental Proxy Form”) in respect of the above resolution has been enclosed with the Supplemental Circular. If a shareholder has properly completed and submitted only the proxy form sent by the Company on 23 April 2026 together with the First AGM Circular (the “First Proxy Form”) in accordance with the instructions set out therein, the appointed proxy will vote on the resolutions set out in the First Proxy Form per the shareholder’s direction and he is entitled to vote or abstain at his discretion on the resolution set out in the Supplemental Proxy Form. Similarly, if a shareholder has properly completed and submitted only the Supplemental Proxy Form in accordance with the instructions set out therein, the appointed proxy will vote on the resolution set out in the Supplemental Proxy Form per the shareholder’s direction and he is entitled to vote or abstain at his discretion on the resolutions set out in the First Proxy Form. If a shareholder wishes to provide specific direction to his proxy regarding the voting of all resolutions set out in the First Proxy Form and the Supplemental Proxy Form, he should duly complete and submit both proxy forms in accordance with the instructions set out therein.

3. The Supplemental Proxy Form for use at the meeting is enclosed. To be valid, the form of proxy, together with the notarially certified power of attorney or other authority (if any) under which it is signed must be lodged at the Company’s branch share registrar in Hong Kong, Tricor Investor Services Limited, at 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong as soon as possible and in any event, not less than 48 hours before the time appointed for holding of the meeting or any adjournment thereof.

4. For determining the entitlement to attend and vote at the meeting, the register of members of the Company will be closed from Tuesday, 23 June 2026 to Friday, 26 June 2026, both days inclusive, during which period no transfer of ordinary shares of the Company will be registered. In order to be eligible to attend and vote at the meeting, all completed transfer documents, accompanied by relevant share certificates, must be lodged with the Company’s Hong Kong branch share registrar in Hong Kong, Tricor Investor Services Limited, at 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong, for registration not later than 4:30 p.m. on Monday, 22 June 2026.

As at the date of this notice, the Board comprises three executive Directors, namely Mr. Yu Zhibo, Mr. Jin Ailong and Ms. Wong Wai Sze, two non-executive Directors, namely Mr. Zheng Ye and Ms. Wong Wai Yin Viola, and three independent non-executive Directors, namely Ms. Zhong Bifeng, Ms. Huang Qingwei and Mr. Chen Yawei.