[SUBJECT TO COMPLETION, DATED APRIL 20, 2018 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED APRIL 20, 2018 CNOOC FINANCE (2015) U.S.A. LLC (formed in the State of Delaware) US$ % Guaranteed Notes due 20 unconditionally and irrevocably guaranteed by CNOOC Limited (incorporated with limited liability in Hon]
[] [CNOOC LIMITED Debt Securities Underwriting Agreement Standard Provisions Guarantor Underwriting Agreement Securities Underwriters Representative Issuer Agreement. Trustee From time to time, CNOOC Limited, a company incorporated with limited liability under the laws of Hong Kong (the Registratio]
[] [CNOOC LIMITED Debt Securities Underwriting Agreement Standard Provisions Guarantor Underwriting Agreement Securities Underwriters Representative Issuer Agreement. Trustee From time to time, CNOOC Limited, a company incorporated with limited liability under the laws of Hong Kong (the Registratio]
[(Title of Class) Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report. Shares 44,647,455,984 ý ¨ Yes ¨ ý Yes ý ¨ Yes ¨ ý Yes ý Large accelerated filer ¨ Accelerated filer ¨ Non-accelerated file]
[(Title of Class) Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report. Shares 44,647,455,984 ý ¨ Yes ¨ ý Yes ý ¨ Yes ¨ ý Yes ý Large accelerated filer ¨ Accelerated filer ¨ Non-accelerated file]
[(Title of Class) Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report. Shares 44,647,455,984 ý ¨ Yes ¨ ý Yes ý ¨ Yes ¨ ý Yes ý ¨ ¨ Large accelerated filer] [Subsidiaries As of December 31, 2017]
