SinoMab BioScience Limited — AGM Information 2023

Apr 26, 2023

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SinoMab BioScience Limited 中國抗體製藥有限公司

(Incorporated in Hong Kong with limited liability) (Stock code: 3681)

Number of shares to which this form of proxy relates[(Note][1)]

FORM OF PROXY FOR THE ANNUAL GENERAL MEETING TO BE HELD AT ROOM 6, 14/F, FAIRMONT HOUSE, 8 COTTON TREE DRIVE, CENTRAL, HONG KONG ON MONDAY, 12 JUNE 2023 AT 10:00 A.M.

I/We[(Note][2)]

of

being the registered holder(s) of shares in the issued share capital of SinoMab BioScience Limited (the ‘‘Company’’) HEREBY APPOINT the Chairman of the meeting[(Note][3)] or

of

as my/our proxy to attend, act and vote for me/us and on my/our behalf as directed below at the annual general meeting (the ‘‘AGM’’) of the Company for the year 2023 to be held at Room 6, 14/F, Fairmont House, 8 Cotton Tree Drive, Central, Hong Kong on Monday, 12 June 2023 at 10:00 a.m. (and at any adjournment thereof). Please tick (‘‘P’’) the appropriate boxes to indicate how you wish your vote(s) to be cast[(Note][4)] .

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----- Start of picture text ----- ORDINARY RESOLUTIONS FOR AGAINST1. To receive the audited consolidated financial statements of the Company and its subsidiaries and the reports of the directorsand auditor for the year ended 31 December 2022.2(a). To re-elect Mr. George William Hunter CAUTHERLEY as an independent non-executive director of the Company.2(b). To re-elect Dr. Haigang CHEN as a non-executive director of the Company.2(c). To re-elect Mr. Xun DONG as a non-executive director of the Company.2(d). To re-elect Mr. Dylan Carlo TINKER as an independent non-executive director of the Company.2(e). To authorise the board of directors to fix the respective directors’ remuneration.3. To re-appoint Ernst & Young as auditor of the Company and to authorise the board of directors to fix its remuneration.4. To give a general mandate to the directors of the Company to buy back shares of the Company not exceeding 10% of thetotal number of issued shares of the Company as at the date of the passing of this resolution.5. To give a general mandate to the directors of the Company to issue, allot and deal with additional shares of the Company notexceeding 20% of the total number of issued shares of the Company as at the date of the passing of this resolution.6. To extend the general mandate granted to the directors of the Company to issue, allot and deal with additional shares in thecapital of the Company by the aggregate number of the shares bought back by the Company under the general mandate inResolution (4).SPECIAL RESOLUTION7. To approve the proposed amendments to the Articles of Association of the Company and the adoption of the SecondAmended and Restated Articles of Association of the Company.*----- End of picture text -----

• Please refer to the notice of 2023 AGM for the full text of the resolution.

• Date: day of 2023 Signature(s)[(Note][5)] Notes: 1. Please insert the number of shares to which this form of proxy relates. If no number is inserted, this form of proxy will be deemed to relate to all the shares of the Company registered in your name(s). If more than one proxy is appointed, the number of shares in respect of which each such proxy so appointed must be specified.

• 2.3. FullIf anyname(s)proxy andotheraddress(es)than the Chairmanto be insertedof theinmeetingBLOCKis CAPITALSpreferred, please. The namesstrike outof allthejointwordsregistered‘‘the Chairmanholders ofshouldthe meetingbe stated.’’ and insert the name and address of the proxy desired in the space provided. Any shareholder of the Company entitled to attend and vote at the AGM is entitled to appoint more than one proxy to attend and vote instead of him. A proxy need

• 1. notIMPORTANT:be a shareholderIF YOUof the Company.WISH TOEveryVOTEshareholderFOR A presentRESOLUTION,in person orPLEASEby proxy TICKshall be(‘‘entitledP’’) THEto oneBOXvote MARKEDfor each share‘‘FORheld’’by. IFhim.YOU WISH TO VOTE AGAINST A RESOLUTION, PLEASE TICK (‘‘P’’) THE BOX MARKED ‘‘AGAINST’’. If no direction is given, your proxy will vote or abstain at his discretion. Your proxy will also be entitled to vote at his discretion on any resolution properly put to the AGM other than those referred to in the notice convening the AGM.
• 1. This form of proxy must be signed by you or your attorney duly authorised in writing. In case of a corporation, the same must be either under its seal or under the hand of a duly authorised officer. ANY ALTERATION MADE TO THIS FORM OF PROXY MUST BE INITIALLED BY THE PERSON WHO SIGNS IT.
• 1. In case of joint holders, the vote of the senior who tenders a vote, whether in person or by proxy, will be accepted to the exclusion of votes of the other joint holder(s) and for this 7. HongpurposeIn orderKong,seniorityto beComputersharevalid,willthisbe formdeterminedHongof proxyKongby andtheInvestoranyorderauthorityinServiceswhich(ifLimited,theany)namesunderatstand17MwhichinFloor,theit isregisterHopewellsigned,oformembersCentre,a copy of183ofsuchtheQueenCompany.power’s Roador authority,East, Wanchai,must beHongdepositedKongatnotthelessCompanythan 48’s sharehours registrar(excludingin any part of a day that is a public holiday) before the time appointed for the meeting or the adjourned meeting (as the case may be) (i.e. not later than 10:00 a.m. on Friday, 9 June 2023 (Hong Kong time)).
• 1. Completion and delivery of the form of proxy will not preclude you from attending and voting in person at the AGM or poll concerned if you so wish. In such event, this form of proxy shall be deemed to be revoked.
• 1. References to time and dates in this form of proxy are to Hong Kong time and dates.

PERSONAL INFORMATION COLLECTION STATEMENT

Youryour votingsupply instructionsof your andforyourtheproxyAGM’s of(ortheproxiesCompany’) name(s)(the ‘andPurposesaddress(es)’). We ismayon transfera voluntaryyourbasisand foryourtheproxypurpose’s (orofproxiesprocessing’) name(s)your requestand address(es)for the appointmentto our agent,of contractor,a proxy (ororproxies)third partyand serviceor are otherwiseprovider whorelevantprovidesfor theadministrative,Purposes and computerneed to receiveand otherthe servicesinformation.to usYourfor useandinyourconnectionproxy’s with(or proxiesthe Purposes’) name(s)and andto suchaddress(es)parties whowill arebe retainedauthorisedforbysuchlawperiodto requestas maythebeinformationnecessary to fulfil the Purposes. Request for access to and/or correction of the relevant personal data can be made in accordance with the provisions of the Personal Data (Privacy) Ordinance and any such request should be in writing by the following means:

By mail to: Personal Data Privacy Officer

Computershare Hong Kong Investor Services Limited

17M Floor, Hopewell Centre, 183 Queen’s Road East, Wanchai, Hong Kong Or By email to: hkinfo@computershare.com.hk

This document is made in English and Chinese. In case of any inconsistency, the English version shall prevail.