Shanghai Junshi Biosciences Co., Ltd. — Proxy Solicitation & Information Statement 2020

May 27, 2020

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.

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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)

NOTICE OF THE 2020 SECOND EXTRAORDINARY GENERAL MEETING

NOTICE IS HEREBY GIVEN that the 2020 second extraordinary general meeting (the “ EGM ”) of Shanghai Junshi Biosciences Co., Ltd.* (the “ Company ”) will be held at 13th Floor, Building 2, Nos. 36, 58 Haiqu Road, Zhangjiang Hi-Tech Park, Shanghai, the People’s Republic of China on Friday, 19 June 2020 at 9:00 a.m., for the following purposes:

ORDINARY RESOLUTIONS

1. To consider and approve the appointment of Mr. Zhang Chun (張淳) as an independent non-executive director of the Company.

2. To consider and approve the Strategic Allotment to the Collective Management Plan.

By Order of the Board Shanghai Junshi Biosciences Co., Ltd. Mr. Xiong Jun* Chairman

Shanghai, the PRC, 27 May 2020

Notes:

1. Pursuant to the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “ Stock Exchange ”) (the “ Listing Rules ”), any vote of shareholders at a general meeting will be taken by poll. As such, each of the resolutions set out in the notice of EGM will be voted by poll. Results of the poll will be published on the Company’s website at www.junshipharma.com and the Stock Exchange’s website at www.hkexnews.hk after the EGM in accordance with the Listing Rules.

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1. The register of members of H shares of the Company has been closed from Wednesday, 20 May 2020 to Friday, 19 June 2020, both days inclusive, during which period no transfer of H shares of the Company will be registered, in order to determine the entitlements of the shareholders of the Company to attend and vote at the EGM to be held on Friday, 19 June 2020. In order to be eligible to attend and vote at the EGM, holders of H shares of the Company whose transfer documents have not been registered are required to deposit all properly completed share transfer forms together with the relevant share certificates to the Company’s H Share registrar, Tricor Investor Services Limited at Level 54, Hopewell Centre, 183 Queen’s Road East, Hong Kong (for holders of H shares) for registration before 4:30 p.m. on Tuesday, 19 May 2020.

2. A shareholder entitled to attend and vote at the meeting may appoint one or more persons as his/her proxy(ies) to attend and vote on his/her behalf. A proxy need not be a shareholder of the Company but must attend the meeting in person to represent the member.

3. The instrument appointing a proxy must be in writing and signed by the appointing shareholder or his/her duly authorized attorney in writing. Where the appointing shareholder is a legal entity, such instrument must be either under its common seal or duly signed by its legal representative, director(s) or duly authorized attorney(s).

4. Shareholders who intend to attend the meeting by proxy should complete the proxy form. For holders of H shares, the proxy form should be returned to the Company’s H Share registrar, Tricor Investor Services Limited at Level 54, Hopewell Centre, 183 Queen’s Road East, Hong Kong, in person or by post as soon as possible not less than 24 hours before the time fixed for holding the EGM or any adjournment thereof. Completion and return of the proxy form will not preclude you from attending the EGM and any adjournment thereof and voting in person. In such event, the form of proxy shall be deemed to be revoked.

5. The EGM is expected to last for less than half a day. Shareholders (in person or by proxy) who attend the EGM should bear their own transportation and accommodation expenses. Shareholders or their proxies attending the EGM shall present their identification documents.

6. Where there are joint registered holders of any share, any one of such persons may vote at the meeting, either in person or by proxy, in respect of such share as if he were solely entitled thereto; but if more than one of such joint holders be present at the meeting, the vote of the senior holder who tenders a vote, whether in person or by proxy, shall be accepted to the exclusion of the votes of the other joint holders and, for this purpose, seniority shall be determined by the order in which the names stand in the register of members of the Company in respect of the joint holding.

7. References to times and dates in this notice are to Hong Kong local times and dates.

8. This notice of EGM is despatched to the holders of H Shares only. The notice of EGM to the holders of Domestic Shares is separately published on the Company’s website (www.junshipharma.com).

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, Dr. Wu Hai and Dr. Yao Sheng as executive Directors; Mr. Tang Yi, Mr. Li Cong, Mr. Yi Qingqing and Mr. Lin Lijun as non-executive Directors; and Dr. Chen Lieping, Dr. He Jia, Mr. Chen Xinjun, Mr. Qian Zhi and Dr. Roy Steven Herbst as independent non-executive Directors.

• For identification purposes only

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