Shanghai Junshi Biosciences : OVERSEAS REGULATORY ANNOUNCEMENT - SHANGHAI JUNSHI BIOSCIENCES CO., LTD.* ANNOUNCEMENT ON RE-ELECTION OF THE NEW SESSION OF THE BOARD OF SUPERVISORS

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.

SHANGHAI JUNSHI BIOSCIENCES CO., LTD.*

上海君實生物醫藥科技股份有限公司

(a joint stock company incorporated in the People's Republic of China with limited liability)

(Stock code: 1877)

OVERSEAS REGULATORY ANNOUNCEMENT

This announcement is made pursuant to Rule 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited.

Reference is made to the "Shanghai Junshi Biosciences Co., Ltd.* Announcement on Re-election of the New Session of the Board of Supervisors" published by Shanghai Junshi Biosciences Co., Ltd. on the website of the Shanghai Stock Exchange, for reference purpose only. The following is a translation of the official announcement solely for the purpose of providing information. Should there be any discrepancies, the Chinese version will prevail.

By order of the Board

Shanghai Junshi Biosciences Co., Ltd.*

Mr. Xiong Jun

Chairman

Shanghai, the PRC, 30 March 2021

As at the date of this announcement, the board of directors of the Company comprises Mr. Xiong Jun, Dr. Li Ning, Dr. Feng Hui, Mr. Zhang Zhuobing and Dr. Yao Sheng as executive Directors; Dr. Wu Hai, Mr. Tang Yi, Mr. Li Cong, Mr. Yi Qingqing and Mr. Lin Lijun as non-executive Directors; and Dr. Chen Lieping, Mr. Qian Zhi, Mr. Zhang Chun, Dr. Jiang Hualiang and Dr. Roy Steven Herbst as independent non-executive Directors.

• For identification purpose only

Stock Code: 688180

Stock Abbreviation: Junshi Bio Announcement No.: Lin 2021-027

Shanghai Junshi Biosciences Co., Ltd.*

Announcement on Re-election of the New Session of

the Board of Supervisors

The Board of Supervisors and all Supervisors of the Company warrant that the contents of this announcement do not contain any false and misleading statement or material omission, and shall undertake legal liabilities in accordance with the law for the truthfulness, accuracy and completeness of the contents herein.

In view of the term of the second session of the Board of Supervisors of Shanghai Junshi Biosciences Co., Ltd.* (上海君實生物醫藥科技股份有限公司) (the "Company") will be expiring, in accordance with the Company Law of the People's Republic of China (《中華人民共和國公司法》) (hereinafter referred to as the

"Company Law"), the Securities Law of the People's Republic of China (《中華人民 共和國證券法》), the Rules Governing the Listing of Stocks on the STAR Market of Shanghai Stock Exchange (《上海證券交易所科創板股票上市規則》) and the Articles of Association of Shanghai Junshi Biosciences Co., Ltd.* (hereinafter referred to as the "Articles of Association"), the Company held the twenty-sixth meeting of the second session of the Board of Supervisors on 30 March 2021 at which the "Resolution on the Re-election and Election of Non-employee Representative Supervisors of the Third Session of the Board of Supervisors" (《關於換届暨選舉第 三届監事會非職工代表監事的議案》) was considered and approved. The particulars

are hereby announced as follows:

1. The Third Session of the Board of Supervisors and its Candidates

In accordance with the Article of Association, the third session of the Board of Supervisors shall consist of three supervisors, including two non-employee representative supervisors and one employee representative supervisor. The Board of Supervisors of the Company agreed to nominate Mr. Wu Yu and Ms. Wang Pingping as the candidates for non-employee representative supervisors of the third session of the Board of Supervisors. The term of office shall be three years from the date on which the resolution is approved at the general meeting.

The nomination and voting procedures for the above candidates for supervisors of the Company are in compliance with the Company Law and other laws and regulations and the relevant provisions of the Articles of Association, and the voting results are legal and valid. For the biographical details of the aforesaid candidates for supervisors, see the appendix.

1. Process for Electing the Third Session of the Board of Supervisors According to the relevant provisions of the Company Law and the Articles of

Association, the resolution on the election of non-employee representative supervisors of the third session of the Board of Supervisors of the Company will need to be submitted to the general meeting of the Company for consideration and be voted by cumulative voting system. After the aforesaid two candidates for non-employee representative supervisors are elected at the general meeting, they will form the third session of the Board of Supervisors of the Company together with the one employee representative supervisor elected at the employee representatives meeting of the Company for a term of three years from the date of approval at the general meeting of the Company.

1. Other Explanations

In order to ensure the normal operation of the Board of Supervisors, the second session of the Board of Supervisors will continue to perform its duties in accordance with laws, regulations, the Articles of Association and other and relevant provisions before the supervisors of the new session of Board of Supervisors take office.

The Company would like to express its sincere gratitude to the Supervisors of the second session of the Board of Supervisors for their contribution to the development of the Company during their tenure.

Announcement is hereby given.

Shanghai Junshi Biosciences Co., Ltd.*

Board of Supervisors

31 March 2021

Appendix：Biographical Details of the Candidates of Supervisors of the Third

Session of the Board of Supervisors

WU YU, born in September 1985, is of Chinese nationality (without foreign permanent residency), and has been serving as a supervisor of the Company since June 2018. Mr. Wu Yu obtained a bachelor's degree in engineering from Shanghai Jiao Tong University in July 2008 and a master's degree in science from Shanghai Jiao Tong University in January 2011. Mr. Wu Yu served as chief analyst in the environmental protection and public utilities department of Sinolink Securities Research Centre from March 2011 to March 2014, NEEQ chief analyst of the research institute of Huatai Securities Co., Ltd. from January 2016 to April 2017, and investment director of Shanghai Guoyin Asset Management Centre (LP)* since October 2017.

As of the date of this announcement, Mr. WU YU has not held any shares of the Company and does not have any related relationship with the directors, other supervisors and senior management of the Company and the shareholders holding more than 5% of the shares of the Company and its de facto controller. There are no circumstances that would prohibit him from serving as a supervisor of the Company pursuant to the provisions of the Company Law. There are no circumstances where he was prohibited by the China Securities Regulatory Commission (CSRC) from access to securities market and the said prohibition has not yet expired, and there are also no circumstances where he was publicly identified by a stock exchange to be unsuitable to act as a supervisor of a listed company. Mr. WU YU was not punished or disciplined by the CSRC, any stock exchange and other relevant authorities, and is not a dishonest person subject to enforcement action as announced by the Supreme People's Court. He complies with the conditions for serving as a supervisor under the relevant laws, regulations and provisions including the Company Law.

WANG PINGPING, born in January 1982, is of Chinese nationality (without foreign permanent residency) and has been serving as a supervisor of the Company since June 2018. Ms. Wang Pingping obtained a bachelor's degree in statistics from Shanghai University of Finance and Economics in June 2003 and a master's degree in economics from Shanghai University of Finance and Economics in January 2006. Ms. Wang Pingping has been a full-time teacher at the College of Economics and Management of the Shanghai University of Electric Power since March 2006.

As of the date of this announcement, Ms. Wang Pingping has not held any shares of the Company and does not have any related relationship with the directors, other supervisors and senior management of the Company and the shareholders holding more than 5% of the shares of the Company and its de facto controller. There are no circumstances that would prohibit her from serving as a supervisor of the Company pursuant to the provisions of the Company Law. There are no circumstances where she was prohibited by the China Securities Regulatory Commission (CSRC) from access to securities market and the said prohibition has not yet expired, and there are also no circumstances where she was publicly identified by a stock exchange to be unsuitable to act as a supervisor of a listed company. Ms. Wang Pingping was not punished or disciplined by the CSRC, any stock exchange and other relevant authorities, and is not a dishonest person subject to enforcement action as announced by the Supreme People's Court. She complies with the conditions for serving as a supervisor under the relevant laws, regulations and provisions including the Company Law.