SHAREHOLDERS COMMUNICATION POLICY

To ensure the effective communications between the Company and our shareholders, we have formulated these communication policies with shareholders pursuant to the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “Hong Kong Listing Rules”), the Articles of Association of the Company (the “Articles”), and the Company Ordinance (Chapter 622 of the Laws of Hong Kong) (the “Companies Ordinance”).

For holders of the shares of the Company listed on the Shanghai Stock Exchange (the "Shanghai Stock Exchange"), the Company will supply information disclosure documents through the website of the Company at www.cnoocltd.com, the official website of the Shanghai Stock Exchange at www.sse.com.cn and the media that meet the conditions prescribed by China Securities Regulatory Commission (the “CSRC”) pursuant to the regulations of the CSRC and the Shanghai Stock Exchange.

CORPORATE COMMUNICATIONS

“Corporate Communication(s)” refers to any document issued or to be issued by the Company for the information or action of holders of any of the Company’s securities as defined in Rule 1.01 the Hong Kong Listing Rules, including but not limited to: (a) the directors’ report, its annual accounts together with a copy of the auditors' report, and, where applicable, its summary financial report; (b) an interim report, and where applicable, its summary interim report; (c) a notice of meeting; (d) a listing document; (e) a circular; and (f) a proxy form.

The English and Chinese versions of all Corporate Communications of the Company are available electronically on the website of the Stock Exchange of Hong Kong Limited (the “Stock Exchange”) at www.hkexnews.hk and the website of the Company at www.cnoocltd.com.

Registered holders of Hong Kong Shares

The Company will supply Corporate Communications to holders of the shares of the Company listed on the Stock Exchange (the “Hong Kong Shares”) by electronic means through the Stock Exchange's website and the Company's website (save for the Actionable Corporate Communication, the “Electronic Version”), provided that the relevant holders of Hong Kong Shares have consented to receiving the Electronic Version in accordance with the Hong Kong Listing Rules, the Companies Ordinance, and the Articles.

The Company will, on an annual basis, seek consent from registered holders of Hong Kong Shares to receiving the Electronic Version of all future Corporate Communications. If the Company does not receive any response from a registered holder of Hong Kong Shares indicating his/her objection to receive the Electronic Version within a period of 28 days, the registered holder of Hong Kong Shares will be deemed to have elected the Electronic Version instead of printed copies of such Corporate Communications. The Company will separately seek consent from each new registered holder to receiving the Electronic Version of all future Corporate Communications.

If a registered holder of Hong Kong Shares has elected (or is deemed to have elected) the Electronic Version, a notification of publication of Corporate Communications on the Stock Exchange's website and the Company's website will be sent to such registered holder of Hong Kong Shares by email, or if no functional email address is provided, will be sent to such registered holder of Hong Kong Shares by post to his/her address as it appears in the Company's register of members. If such registered holder of Hong Kong Shares but for any reason has difficulty in accessing the relevant Corporate Communications electronically or wishes to receive printed copies of such Corporate Communications, the Company will promptly upon his/her request provide printed copies to him/her free of charge.

Where a Corporate Communication is issued to seek instructions from the registered holders of Hong Kong Shares on how they wish to exercise their rights or make an election as shareholders (“Actionable Corporate Communication”), the Actionable Corporate Communication will be sent to registered holders of Hong Kong Shares individually by email, or if no functional email address has been provided by the relevant registered holders of Hong Kong Shares, by post to their addresses as they appear in the Company's register of members.  For the avoidance of doubt, Actionable Corporate Communications do not include notices of general meetings and proxy forms.

The Company will despatch printed copies of the Corporate Communications in the choice of language of the registered holders of Hong Kong Shares to their addresses pursuant to their request, or if consent has not been obtained from them for receiving the Electronic Version, or if such Corporate Communications are Actionable Corporate Communications and such registered holders of Hong Kong Shares have not provided a functional email address.

Non-registered holders of Hong Kong Shares

A notification of publication of Corporate Communications on the Stock Exchange's website and the Company's website will be sent by email, or if no functional email address is provided and the Company has obtained their postal addresses, by post to non-registered holders of Hong Kong Shares whose Hong Kong Shares (whether or not held through a broker or custodian) are kept in the Central Clearing and Settlement System (CCASS). Non-registered holders may also request to receive printed copies of the Corporate Communications.

REQUEST FOR PRINTED COPIES OR ELECTION OF LANGUAGE AND MEANS OF RECEIPT OF CORPORATE COMMUNICATIONS

Registered holders and non-registered holders of Hong Kong Shares may at any time change their choice of language or means of receipt of Corporate Communications by completing and returning a request form to our Hong Kong share registrar.

A registered or non-registered holder of Hong Kong Shares, who wishes to receive a Corporate Communication in printed form or in a language other than his/her existing choice, or wishes to change his/her choice of language or means of receiving Corporate Communications, may complete the below request form and submit it to our Hong Kong share registrar by post to 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wan Chai, Hong Kong, or by email to Cnooc.ecom@computershare.com.hk. The relevant request shall be valid from the date on which such request form is received until the next time when the Company seeks consent from its registered holders of Hong Kong Shares to receiving the Electronic Version of all future Corporate Communications.

Corporate Communication Request Form for Registered holders

Corporate Communication Request Form for Non-registered holders

ENQUIRIES

Holders of Hong Kong Shares who have any queries in relation to request for printed copies or election of language and means of receipt of Corporate Communications may call the enquiry hotline of our Hong Kong share registrar, Hong Kong Registrars Limited, on (852) 2862 8688 during business hours from 9:00 am to 6:00 pm from Monday to Friday, excluding Hong Kong public holidays.

Hong Kong Registrars Limited

Address: 17M Floor, Hopewell Centre, 183 Queen’s Road East, Wan Chai, Hong Kong

Tel: (852) 2862 8688

Email: Cnooc.ecom@computershare.com.hk