SinoMab BioScience Limited — Board/Management Information 2025

Jun 12, 2025

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.

SINOMAB

SinoMab BioScience Limited

中國抗體製藥有限公司

(Incorporated in Hong Kong with limited liability)

(Stock code: 3681)

RESIGNATION OF EXECUTIVE DIRECTOR

The board of directors (the "Board") of SinoMab BioScience Limited (the "Company", together with its subsidiaries, the "Group") hereby announces that on 12 June 2025, the Company received a resignation letter dated 9 June 2025 from Mr. Shanchun WANG ("Mr. Wang") to tender his resignation as an executive director of the Company and from his directorships in certain subsidiaries of the Group with effect from 9 June 2025, in order to devote more time to his other personal commitments. Following his resignation, Mr. Wang will not hold any position within the Group.

Mr. Wang has confirmed that he has no disagreement with the Board and there are no other matters in relation to his resignation that need to be brought to the attention of The Stock Exchange of Hong Kong Limited and the shareholders of the Company.

By Order of the Board

SinoMab BioScience Limited

Dr. Shui On LEUNG

Executive Director, Chairman and Chief Executive Officer

Hong Kong, 12 June 2025

As at the date of this announcement, the executive director of the Company is Dr. Shui On LEUNG, the non-executive directors of the Company are Dr. Haigang CHEN, Mr. Xun DONG, Ms. Xiaosu WANG and Dr. Jianmin ZHANG and the independent non-executive directors of the Company are Mr. George William Hunter CAUTHERLEY, Mr. Ping Cho Terence HON and Dr. Chi Ming LEE.