Shanghai Junshi Biosciences : OVERSEAS REGULATORY ANNOUNCEMENT - SHANGHAI JUNSHI BIOSCIENCES CO., LTD.* ANNOUNCEMENT ON THE CONVENING OF THE 2020 ANNUAL RESULTS BRIEFING

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 the Convening of the 2020 Annual Results Briefing" 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, 31 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 short name: Junshi Bio Announcement No.: Lin 2021-032

Shanghai Junshi Biosciences Co., Ltd.*

Announcement on the Convening of the 2020 Annual

Results Briefing

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

Important notice:

• Time of the Briefing: 14:00-15:00, 6 April 2021
• Mode of the Briefing: Webcast with text interaction
• Venue of the Briefing: SSE Roadshow Center (http://roadshow.sseinfo.com)

I. Type of the Briefing

Shanghai Junshi Biosciences Co., Ltd.* (the "Company") has published the 2020 annual report of the Company on the website of the Shanghai Stock Exchange (www.sse.com.cn) on 31 March 2021. In order to facilitate its communication with investors, with the support from the Shanghai Stock Exchange, the Company plans to convene the 2020 annual results briefing at 14:00-15:00 on 6 April 2021. Investors are welcome to attend.

1. Time, Mode and Venue of the Briefing Time of the Briefing: 14:00-15:00,6 April 2021 Mode of the Briefing: Webcast with text interaction
   Venue of the Briefing: SSE Roadshow Center (http://roadshow.sseinfo.com)

III. Attendees

Attendees of the briefing include: Mr. NING LI (executive director and general manager), Mr. XU BAOHONG (financial director), and Ms. CHEN YINGGE (secretary of the Board), subject to changes in case of any special circumstances.

IV. How Investors Participate

Investors may visit the website of the SSE Roadshow Center (http://roadshow.sseinfo.com) at 14:00-15:00, 6 April 2021 to watch the briefing online. To improve communication efficiency, the Company is now collecting enquiries from investors in advance. Investors are invited to send enquiries to the Company via the investor relations email address ([e-mail]) by 17:00, 5 April 2021. The Company will respond to enquiries that investors are generally concerned about at the briefing.

V. Contact Details for the Briefing

Contact Department: Securities Department

Contact Tel.: [phone]

Contact Email: [e-mail]

Notice is hereby given.

Shanghai Junshi Biosciences Co., Ltd.*

Board of Directors

1 April 2021

* For identification purpose only