SinoMab BioScience Limited — Share Issue/Capital Change 2023

Nov 16, 2023

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.

==> picture [29 x 44] intentionally omitted <==

==> picture [29 x 44] intentionally omitted <==

SinoMab BioScience Limited 中國抗體製藥有限公司

(Incorporated in Hong Kong with limited liability)

(Stock code: 3681)

GRANT OF SHARE OPTIONS

This announcement is made pursuant to Rule 17.06A of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the ‘‘Listing Rules’’).

The board (the ‘‘Board’’) of directors (the ‘‘Director(s)’’) of SinoMab BioScience Limited (the ‘‘Company’’, together with its subsidiaries, the ‘‘Group’’) hereby announces that on 16 November 2023, 14,660,000 share options (the ‘‘Share Options’’) were granted by the Company (the ‘‘Grant’’) under its share option scheme adopted at the extraordinary general meeting held on 26 October 2022 (the ‘‘2022 Share Option Scheme’’) to 49 eligible persons (the ‘‘Grantees’’), all of whom are employees of the Group, to subscribe for an aggregate of 14,660,000 new shares of the Company (the ‘‘Shares’’), subject to acceptance of the Grantees. Details of the Grant are set out below:

Date of Grant 16 November 2023 Categories of Grantees Employee Exercise price of Share Options HK$1.120 per Share granted Number of Share Options 14,660,000 granted Closing price of the Shares on HK$1.120 per Share the date of Grant Average closing price of the HK$1.094 per Share Shares for the five consecutive trading days prior to the date of Grant Exercisable period of Share The Share Options are exercisable for a period of 8 Options years commencing from 17 November 2025 to 16 November 2033.

– 1 –

Vesting Schedule of Share The Share Options granted shall be vested over three Options years from 17 November 2025 to 17 November 2028. Grantee None of the Grantees is a Director, chief executive or substantial shareholder of the Company, or an associate (as defined under the Rule 14A.06 of the Listing Rules) of any of them. Performance Target The number of Options granted to the Grantees is based on the positions, job tenure and performance evaluation results of the Grantees. The Group has in place a performance evaluation mechanism for its employees to comprehensively evaluate their performance and contribution to the Group. Based on their performance evaluation results, the Grantees receive different levels of rating which may affect the vesting period and the number of Options to be vested of each individual Grantee. In any event, the earliest vesting date shall not be before 17 November 2025. Clawback Mechanism No clawback mechanism is stipulated in the Grant. The remuneration committee of the Company is of the view that clawback mechanism is not necessary as the scheme rules of the 2022 Share Option Scheme already provided the lapse and cancellation of options in different scenarios and provided enough protection to the Company’s interests. Number of Shares available for 433,620 future grant under scheme mandate Number of Shares available for 433,620 future grant under service provider sublimit[(Note)]

Note: service provider sublimit is within the scheme mandate.

By Order of the Board

SinoMab BioScience Limited Dr. Shui On LEUNG

Executive Director, Chairman and Chief Executive Officer

Hong Kong, 16 November 2023

As at the date of this announcement, the executive Director is Dr. Shui On LEUNG, the nonexecutive Directors are Dr. Haigang CHEN, Mr. Xun DONG, Dr. Wenyi LIU, Mr. Lei SHI and Dr. Jianmin ZHANG, and the independent non-executive Directors are Mr. George William Hunter CAUTHERLEY, Mr. Ping Cho Terence HON, Dr. Chi Ming LEE and Mr. Dylan Carlo TINKER.

– 2 –