CHANGE OF CHIEF FINANCIAL OFFICER,COMPANY SECRETARY ANDAUTHORISED REPRESENTATIVE

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement 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 announcement.* (Incorporated in Bermuda with limited liability) (Stock Code: 632) CHANGE OF CHIEF FINANCIAL OFFICER COMPANY SECRETARY AND AUTHORISED REPRESENTATIVE CHANGE OF CHIEF FINANCIAL OFFICER AND COMPANY SECRETARY The board (the “Board”) of directors (“Directors”) of CHK Oil Limited (the “Company” together with its subsidiaries collectively the “Group”) announces that with effect from 2 July 2024 (i) Mr. Li Siu Bun (“Mr. Li”) has resigned as the Chief Financial Officer (the “CFO”) of the Company the company secretary of the Company (the “Company Secretary”); (ii) Ms. Liu Xiaoting (“Ms. Liu”) will be appointed as the CFO of the Company and the Company Secretary of the Company.Ms. Liu graduated with a Bachelor of Commerce (Accounting) from The University of Sydney in October 2007 and a Master of Financial Analysis from University of New South Wales Australia in August 2010. Ms. Liu is a member of both Hong Kong Institute of Certified Public Accountants and the CPA Australia. Prior to joining the Company she was working in the position as a company secretary and/or senior positions in finance management at companies listed on the Stock Exchange of Hong Kong Limited (the “Stock Exchange”). From October 2010 to February 2015 Ms. Liu was working at PricewaterhouseCoopers. * For identification purpose only – 1 –CHANGE OF AUTHORISED REPRESENTATIVE Mr. Li will cease to be the authorised representative of the Company for the purpose of Rule 3.05 of The Rules Governing the Listing of Securities on the Stock Exchange (the “Listing Rules”) and the authorised representative of the Company for accepting on the Company’s behalf service of process or notice to be served on the Company in Hong Kong under the Companies Ordinance (Chapter 622 of the Laws of Hong Kong) (the “Companies Ordinance”) (collectively the “Authorised Representative”) and Ms. Liu will be appointed as the Authorised Representative for the purposes of the Listing Rules and the Companies Ordinance with effect from 2 July 2024.The Board would like to take this opportunity to express its warmest welcome to Ms. Liu for joining the Company and to express its deep appreciation to Mr. Li for his valuable contributions to the Group during his tenure of office.By Order of the Board CHK Oil Limited Yu Jiyuan Chairman and Executive Director Hong Kong 2 July 2024 As at the date of this announcement the Board comprises five executive Directors namely Mr. Yu Jiyuan Mr. Yu Zhibo Mr. Jin Ailong Ms. Yang Yuyan and Ms. Sun Xiaoze and three non- executive Directors Mr. Lin Qing Yu Ms. Chen Junyan and Mr. Zheng Ye and four independent non-executive Directors namely Ms. Zhong Bifeng Ms. Huang Qingwei Mr. Shen Shigang and Ms. Lam Shuk Yi Mariana.–2–