RemeGen Co., Ltd. — Proxy Solicitation & Information Statement 2025

May 26, 2025

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.

RemeGen荣昌生物

RemeGen Co., Ltd.*

荣昌生物製藥(煙台)股份有限公司

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

(Stock Code: 9995)

NOTICE OF 2025 FIRST CLASS MEETING OF H SHAREHOLDERS

NOTICE IS HEREBY GIVEN that the 2025 first class meeting of H shareholders (the "H Share Class Meeting") of RemeGen Co., Ltd.* (榮昌生物製藥(煙台)股份有限公司) (the "Company") will be held at Room 6134, Phase III Building of the Company at 58 Middle Beijing Road, Yantai Development Zone, Yantai Area of Shandong Pilot Free Trade Zone, PRC at 2:40 p.m. or immediately after the conclusion of the Annual General Meeting and the A Share Class Meeting to be held at the same location, whichever is later, on June 26, 2025 or at any adjournment thereof for the purpose of considering and, if thought fit, passing the following resolutions. Unless otherwise specified, capitalized terms used in this notice shall have the same meaning as those defined in the circular of the Company dated May 27, 2025 (the "Circular").

SPECIAL RESOLUTIONS

1. To consider and approve the change of registered capital of the Company, the cancellation of the supervisory committee of the Company and the proposed amendments to the Articles of Association of the Company.
2. To consider and approve the proposed amendments to the Rules of Procedures for the Meeting of Shareholders of the Company.

By order of the Board

RemeGen Co., Ltd.*

荣昌生物製藥(煙台)股份有限公司

Mr. Wang Weidong

Chairman and executive director

Yantai, the PRC

May 27, 2025

• For identification purpose only

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Notes:

1. All resolutions at the H Share Class Meeting will be taken by poll (except where the chairman decides to allow a resolution relating to a procedural or administrative matter to be voted on by a show of hands) pursuant to the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited. The results of the poll will be published on the websites of the Company at www.remegen.com and The Stock Exchange of Hong Kong Limited at www.hkexnews.hk after the H Share Class Meeting.

2. Any shareholder entitled to attend and vote at the H Share Class Meeting convened by the above notice is entitled to appoint one or more proxies to attend and vote instead of him/her. A proxy need not be a shareholder of the Company.

3. In order to be valid, the instrument appointing a proxy together with the power of attorney or other authority, if any, under which it is signed, or a notarially certified copy of such power of attorney or authority, must be completed and returned to the H Share registrar of the Company, Computershare Hong Kong Investor Services Limited, at 17M Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong (for holders of H Shares), at least 24 hours before the H Share Class Meeting (i.e. before 2:40 p.m. on June 25, 2025) or any adjourned meeting thereof. Completion and return of the form of proxy will not preclude a shareholder from attending and voting at the H Share Class Meeting or any adjourned meeting thereof should he/she so wish.

4. For the purpose of determining the list of holders of H shares who are entitled to attend the H Share Class Meeting, the H Share register of members of the Company will be closed from June 23, 2025 to June 26, 2025, both days inclusive, during which period no transfer of H Shares will be registered. The holders of H Shares whose names appear on the H Share register of members of the Company on June 23, 2025 shall be entitled to attend and vote at the H Share Class Meeting. In order to be eligible to attend and vote at the H Share Class Meeting, unregistered holders of the H Shares shall ensure all transfer documents accompanied by the relevant share certificates must be lodged with the Company's H Share registrar, Computershare Hong Kong Investor Services Limited, at Shops 1712-1716, 17th Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong no later than 4:30 p.m. on June 20, 2025 for registration.

5. Where there are joint registered holders of any share, any one of such joint holders may vote, either in person or by proxy, in respect of such share as if he/she was solely entitled thereto, but if more than one of such joint holders are present at the H Share Class Meeting, whether in person or by proxy, the joint registered holder present whose name stands first on the register of members of the Company in respect of the shares shall alone be entitled to vote in respect thereof.

6. The H Share Class Meeting is expected to take less than half a day. Shareholders who attend the H Share Class Meeting shall be responsible for their own travel and accommodation expenses. Shareholders may contact the Company at +86-0535-3573685 or IR@remegen.com for any enquiries in respect of the H Share Class Meeting.

As at the date of this notice, the board of directors of the Company comprises Mr. Wang Weidong, Dr. Fang Jianmin, Mr. Lin Jian and Mr. Wen Qingkai as executive directors, Dr. Wang Liqiang and Dr. Su Xiaodi as non-executive directors, and Mr. Hao Xianjing, Mr. Chen Yunjin and Mr. Huang Guobin as independent non-executive directors.