OREANDA-NEWS. May 26, 2014. References are made to the paragraph headed “Material Legal Proceedings” in the “Report of the Directors” of the 2011 and 2012 annual reports, the announcement dated 22 October 2012, note 20(iii)(e) to the interim condensed consolidated financial statements of the 2013 interim report and the paragraph headed “Material Legal Proceeding” in the “Report of the Directors” of the 2013 annual report of CNOOC Limited (the "Company") in relation to a purported class action complaint filed by Sam Sinay, individually and on behalf of all others similarly situated (collectively, the “Appellant”) at the United States District Court for the Southern District of New York and the subsequent appeal brought by the Appellant to the United States Court of Appeals for the Second Circuit (the “Court of Appeals”).

The Court of Appeals issued a Summary Order on 3 February 2014 (New York time) which found the Appellant’s argument withoutmerit and affirmed the Trial Court’s judgment. The Appellant was able to appeal against the Court of Appeals’ decision by filing a petition for a writ of certiorari inthe Supreme Court of the United States within 90 days from the issue of the Summary Order (namely, on or before 5 May 2014, New York time) (the “Appeal Period”).

The Company announces that as of the date of this announcement, the Appellant has not filed a petition for a writ of certiorari in the Supreme Court. As the Appellant has not filed any appeal within the Appeal Period and the Appeal Period is now over, in accordance with the laws of the United States, all the claims brought by the Appellant at the Trial Court and the Court of Appeals are dismissed in their entirety.