The board of directors of CStone Pharmaceuticals announced that Mr. Yanling Cao tendered his resignation as a non-executive director and a member of the nomination committee of the Company with effect from January 18, 2023, as he intends to focus and devote more time to his other work commitments. The Board hereby announces that (i) Mr. He Ning has tendered his resignation as the joint company secretary of the Company with effect from January 18, 2023; and (ii) Ms. Ni Weicong has been appointed as the Joint Company Secretary with effect from January 18, 2023. Ms. Ho Yin Kwan will remain as the other Joint Company Secretary.

Ms. Ni joined the Company in August 2018 and is the secretary of the Board and head of capital markets and business planning of the Company. Currently, she handles Board matters as well as matters in relation to investor relations and financing. Prior to joining the Company, from July 2013 to May 2016, Ms. Ni worked at Deutsche Bank Hong Kong branch as an investment banker advising public and private companies on equity and debt financing, investments, and merger and acquisition.

Ms. Ni received a bachelor's degree in finance and economics from Hong Kong University of Science and Technology in 2013 and also an MBA degree from Harvard Business School in 2018. Ms. Ho is a vice president of SWCS Corporate Services Group (Hong Kong) Limited. She has over 20 years of professional experience in corporate secretarial field and has been providing corporate secretarial services to both listed and private companies incorporated in Hong Kong and overseas.

Ms. Ho holds a bachelor's degree in business and finance from the University of Portsmouth and a master's degree in corporate governance from the Open University of Hong Kong (currently known as Hong Kong Metropolitan University). Ms. Ho is a member of The Hong Kong Chartered Governance Institute and The Chartered Governance Institute in the United Kingdom. Ms. Ho possesses the professional qualification as required under note 1 of the Rule 3.28 of the Listing Rules.