CNOOC Limited — Regulatory Filings 2026

May 7, 2026

Noc

CNOOC Limited

(中國海洋石油有限公司)

(Incorporated in Hong Kong with limited liability under the Companies Ordinance)

Stock Codes: 00883 (HKD counter) and 80883 (RMB counter)

Form of proxy for the 2025 Annual General Meeting to be held on 3 June 2026

I/We, being the registered holder(s) of CNOOC Limited (the "Company"), hereby appoint the proxy $^{(Note 1)}$ as specified below or failing him/her, THE CHAIRMAN OF THE MEETING $^{(Note 1)}$ to attend and vote for me/us and on my/our behalf at the 2025 annual general meeting of the Company to be held at Island Shangri-La Hotel Hong Kong, Pacific Place, Supreme Court Road, Central, Hong Kong on 3 June 2026 at 10:00 a.m. and at any adjournment thereof in respect of the resolutions as indicated below, or if no such indication is given, as my/our proxy thinks fit.

Registered Holder(s) (Complete in ENGLISH BLOCK CAPITALS. The names of all joint holders should be stated.)
Registered Name
Registered Address
Certificate No. $^{(Note 2)}$		Signature $^{(Note 4)}$
Registered Holding $^{(Note 3)}$
Date
Proxy $^{(Note 1)}$ (Complete in ENGLISH BLOCK CAPITALS.)
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Full Name $^{(Note 1)}$		No. of Shares $^{(Note 5)}$
Full Address $^{(Note 1)}$
	ORDINARY RESOLUTIONS*	FOR $^{(Note 6)}$	AGAINST $^{(Note 6)}$
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1.	To receive and consider the audited financial statements, the independent auditors' report, and the report of the Directors for the year ended 31 December 2025.
2.	To re-elect Mr. Zhang Chuanjiang as a Non-executive Director.
3.	To re-elect Mr. Huang Yongzhang as an Executive Director.
4.	To re-elect Mr. Lin Boqiang as an Independent Non-executive Director.
5.	To re-elect Ms. Li Shuk Yin Edwina as an Independent Non-executive Director.
6.	To authorise the Board to fix the remuneration schemes and the remuneration of each Director.
7.	To re-appoint Ernst & Young Hua Ming LLP and Ernst & Young as the domestic and overseas independent auditors of the Company and its subsidiaries for the year of 2026 respectively, and to authorise the Board to fix their remuneration.
8.	To declare a final dividend for the year ended 31 December 2025.
9.	To authorise the Board to determine the declaration plan of the 2026 interim dividend within the scope of the Interim Dividend Authorisation, and to authorise the Board and the persons authorised by the Board to deal with all matters relating to the declaration of the 2026 interim dividend by the Company.

• The full text of the resolutions is set out in the Notice of Annual General Meeting which is included in the circular of the Company dated 7 May 2026 (the "Circular") despatched to the shareholders of the Company and available on the Company's website (www.cnoocltd.com) and the website of The Stock Exchange of Hong Kong Limited (www.hkexnews.hk).

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Notes:

1. If any proxy other than the chairman of the meeting is preferred, please insert the full name and address of the proxy desired in the space provided. A holder entitled to attend and vote at the meeting of the Company is entitled to appoint one or more proxies to attend and vote on his/her behalf. ANY ALTERATION MADE TO THIS PROXY FORM MUST BE INITIALLED BY THE PERSON WHO SIGNS IT. The proxy needs not be a member of the Company, but must attend the meeting (or any adjournment thereof) to represent you.

2. Please provide one certificate number, if possible, to facilitate processing.

3. Please insert the number of shares registered in the name of the holder(s).

4. This proxy form must be signed and dated by the shareholder or his/her attorney duly authorised in writing. If the shareholder is a company, it should execute this proxy form under its common seal or by the signature(s) of (a) person(s) authorised to sign on its behalf. In the case of joint shareholders, any one of the joint shareholders may sign this proxy form. The vote of the senior joint shareholder who tenders a vote, whether in person or by proxy, will be accepted to the exclusion of the votes of the other joint shareholder(s) and for this purpose, seniority will be determined by the order in which the names stand in the register of members in respect of the joint shareholding.

5. Please insert the number of shares for this proxy. If no number is inserted, this proxy form will be deemed to relate to all the shares registered in the name of the holder(s).

6. IMPORTANT: IF YOU WISH TO VOTE FOR A RESOLUTION, TICK (✓) IN THE BOX MARKED “FOR”. IF YOU WISH TO VOTE AGAINST A RESOLUTION, TICK (✓) IN THE BOX MARKED “AGAINST”. IF YOU WISH TO ABSTAIN FROM VOTING, TICK (✓) IN THE RELEVANT BOX BELOW THE BOX MARKED “ABSTAIN”. THE SHARES ABSTAINED WILL BE COUNTED IN THE CALCULATION OF THE REQUIRED MAJORITY. Failure to tick (✓) in any box in respect of a resolution will entitle your proxy to cast your vote in respect of that resolution at his/her discretion or to abstain. YOUR PROXY WILL ALSO BE ENTITLED TO VOTE AT HIS/HER DISCRETION OR TO ABSTAIN ON ANY RESOLUTION PROPERLY PUT TO THE MEETING OTHER THAN THOSE REFERRED TO IN THE NOTICE CONVENING THE MEETING.

7. In order to be valid, a proxy form and the power of attorney or other authority (if any) under which it is signed, or a notarially certified copy of such power of attorney, must be deposited at the Company’s Hong Kong registrar, Computershare Hong Kong Investor Services Limited, at 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wan Chai, Hong Kong, not less than 36 hours before the time fixed for holding the meeting or any adjournment thereof.

8. Completion and delivery of this proxy form will not preclude you from attending and voting at the meeting if you so wish.

9. For the avoidance of doubt, we do not accept any special instructions written on this proxy form.