PDF《CNOOC Limited （中国海洋石油有限公司）》

If you are in any doubt as to any aspect of this document or as to the action to be taken, you should consult a stockbroker or other registered dealer in securities, a bank manager, solicitor, professional accountant or other professional adviser.

If you have sold or transferred all your shares in CNOOC Limited you should at once pass this document to the purchaser or to the bank, stockbroker or other agent through whom the sale was effected for transmission to the purchaser. Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this document, 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 document. CNOOC Limited (中国海洋石油有限公司) (Incorporated in Hong Kong with limited liability under the Companies Ordinance) (Stock Code: 00883) SUPPLEMENTAL CIRCULAR TO EXPLANATORY STATEMENT DATED

4 APRIL

2019 TO SHAREHOLDERS IN RELATION TO PROPOSED RE-ELECTION OF DIRECTORS AT ANNUAL GENERAL MEETING AND SUPPLEMENTAL NOTICE OF ANNUAL GENERAL MEETING This supplemental circular and supplemental notice should be read together with the explanatory statement issued by CNOOC Limited (the Company ) dated

4 April

2019 and the notice convening the annual general meeting of the Company (the Circular ) to be held on

23 May

2019 at 3:00 p.m. at Island Shangri-La Hotel Hong Kong, Pacific Place, Supreme Court Road, Central, Hong Kong (the AGM ). A revised form of proxy (the Revised Proxy Form ) is also enclosed with this supplemental circular and supplemental notice for use at the AGM. The Revised Proxy Form is also published on the website of The Stock Exchange of Hong Kong Limited at www.hkexnews.hk. The form of proxy despatched with the Circular is superseded by the Revised Proxy Form enclosed herewith. Whether or not you intend to attend the AGM, please complete the enclosed Revised Proxy Form in accordance with the instructions printed thereon and return it to the Company'

s registered office at 65th Floor, Bank of China Tower,

1 Garden Road, Central, Hong Kong as soon as possible, and in any event not less than

36 hours before the time appointed for holding of the AGM or any adjournment thereof (as the case may be), if you do not intend to be present in person at the meeting. Completion and return of the Revised Proxy Form will not preclude shareholders from attending and voting at the AGM or any adjournment thereof if they so wish and, in such event, the relevant Revised Proxy Form shall be deemed to be revoked. IMPORTANT

7 May

2019 CNOOC Limited (中国海洋石油有限公司) (Incorporated in Hong Kong with limited liability under the Companies Ordinance) (Stock Code: 00883) Executive Directors: Yuan Guangyu Xu Keqiang Non-executive Directors: Yang Hua (Chairman) Wang Dongjin (Vice Chairman) Independent Non-executive Directors: Chiu Sung Hong Lawrence J. Lau Tse Hau Yin, Aloysius Qiu Zhi Zhong Registered office: 65th Floor, Bank of China Tower

1 Garden Road Central Hong Kong

7 May

2019 To the Shareholders Dear Sir or Madam, SUPPLEMENTAL CIRCULAR TO EXPLANATORY STATEMENT DATED

4 APRIL

2019 TO SHAREHOLDERS IN RELATION TO PROPOSED RE-ELECTION OF DIRECTORS AT ANNUAL GENERAL MEETING AND SUPPLEMENTAL NOTICE OF ANNUAL GENERAL MEETING INTRODUCTION This supplemental circular should be read together with the explanatory statement issued by the Company to the Shareholders dated