Shanghai Junshi Biosciences Co., Ltd. — Proxy Solicitation & Information Statement 2024

May 30, 2024

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this notice, 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 notice.

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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 CLASS MEETING OF H SHAREHOLDERS

NOTICE IS HEREBY GIVEN that the 2024 first class meeting of H shareholders (the “ Class Meeting of H Shareholders ”) of Shanghai Junshi Biosciences Co., Ltd.* (the “ Company ”) will be held immediately after the conclusion of the 2024 first class meeting of A shareholders of the Company (or any adjournment thereof) at 15th Floor, Building 7, No. 6, Lane 100, Pingjiaqiao Road, Pudong New Area, Shanghai, the People’s Republic of China on Friday, 21 June 2024, to consider and, if thought fit, approve the following resolutions:

SPECIAL RESOLUTIONS[(9)]

1. The proposal in relation to the grant of the general mandate to repurchase H Shares; and

2. The proposal in relation to the amendments to the Articles of Association and the Relevant Rules of Procedures.

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

Chairman

Shanghai, PRC, 30 May 2024

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Notes:

1. The register of members of H shares of the Company will be closed from Monday, 17 June 2024 to Friday, 21 June 2024, 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 AGM. In order to be eligible to attend and vote at the Class Meeting of H Shareholders, all transfers of H shares accompanied by the relevant share certificates and transfer forms must be lodged with the Company’s H share registrar, Tricor Investor Services Limited at 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong (for holders of H shares) before 4:30 p.m. on Friday, 14 June 2024, being the last share registration date.

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 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 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong, in person or by post as soon as possible not less than 24 hours before the time fixed for holding the meeting or any adjournment thereof. Completion and return of the proxy form will not preclude you from attending the meeting and any adjournment thereof and voting in person. In such event, the form of proxy shall be deemed to be revoked.

5. The Class Meeting of H Shareholders is expected to last for less than half a day. Shareholders (in person or by proxy) who attend the Class Meeting of H Shareholders should bear their own transportation and accommodation expenses. H Shareholders or their proxies attending the Class Meeting of H Shareholders 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/she 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. Unless otherwise stated, capitalized terms used herein shall have the same meanings as that defined in the circular of the Company dated 30 May 2024 (“ Circular ”). References to times and dates in this notice are to Hong Kong local times and dates.

8. Further details of the resolutions have been included in the Circular.

9. This notice of Class Meeting of H Shareholders is for the holders of H shares only. The notice of Class Meeting of H Shareholders to the holders of A Shares is separately published on the website of the Shanghai Stock Exchange (http://www.sse.com.cn/).

As at the date of this notice, the Board of Directors of the Company comprises Mr. Xiong Jun, Dr. Li Ning, Mr. Zhang Zhuobing, Dr. Yao Sheng, Mr. Li Cong, Dr. Zou Jianjun, Dr. Wang Gang and Dr. Li Xin as executive Directors; Dr. Feng Hui and Mr. Tang Yi as non-executive Directors; and Dr. Roy Steven Herbst, Mr. Qian Zhi, Mr. Zhang Chun, Dr. Feng Xiaoyuan and Dr. Meng Anming as independent non-executive Directors.

• For identification purpose only.

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