Zai Lab Limited — AGM Information 2021

Apr 13, 2021

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.

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**Zai Lab Limited 再鼎醫藥有限公司 ***

(Incorporated in the Cayman Islands with limited liability) (Stock Code: 9688)

RECORD DATE

Our Board announces that the record date for the purpose of determining the eligibility of the holders of our ordinary shares, par value US$0.00006 per share (the “ Ordinary Shares ”) to attend and vote at our forthcoming annual general meeting (the “ Annual General Meeting ”) will be on Tuesday, April 27, 2021, Hong Kong time (the “ Ordinary Shares Record Date ”). In order to be eligible to attend and vote at the Annual General Meeting, all valid documents for the transfers of shares accompanied by the relevant share certificates must be lodged with the Company’s Hong Kong branch share registrar and transfer office, Computershare Hong Kong Investor Services Limited, Shops 1712–1716, 17th Floor, Hopewell Centre, 183 Queen’s Road East, Hong Kong, not later than 4:30 p.m. on Tuesday, April 27, 2021, Hong Kong time. All persons who are registered holders of the Ordinary Shares on the Ordinary Shares Record Date will be entitled to attend and vote at the Annual General Meeting.

Holders of American Depositary Shares (the “ ADSs ”) issued by Citibank, N.A., as depositary of the ADSs, and representing our Ordinary Shares will not be entitled to attend the Annual General Meeting and cannot vote their ADSs directly. Holders of record of ADSs as of 4:30 p.m. (Eastern Daylight time) on Tuesday, April 27, 2021 (the “ ADSs Record Date ”, together with the Ordinary Shares Record Date, the “ Record Date ”) may exercise the voting rights with respect to the underlying Ordinary Shares in accordance with the provisions of the deposit agreement among the Company, Citibank N.A. and the holders and beneficial owners of ADSs, or the deposit agreement. Holders of record of ADSs as of the Record Date who wish to exercise their voting rights for the underlying Ordinary Shares must act through Citibank N.A. The deposit agreement permits registered holders of ADSs as of the ADS Record Date to instruct Citibank N.A. to exercise the voting rights for the Ordinary Shares represented by ADSs. Citibank N.A. has agreed that it will endeavor, insofar as practicable and permitted under applicable law and the provisions of the deposit agreement, to vote the securities (in person or by proxy) represented by the holder’s ADSs in accordance with such voting instruction as of the ADS Record Date. If a holder of ADSs cancels his, her or its ADSs in exchange for Ordinary Shares on or prior to the ADS Record Date, such holder of ADSs will not be able to instruct Citibank, N.A., as depositary of the ADSs as to how to vote the Ordinary Shares represented by the canceled ADSs as described above. Holders of ADSs who wish to cancel their ADSs in exchange for Ordinary Shares for the purpose of voting Ordinary Shares directly will need to make arrangements to deliver their ADSs to the Citibank, N.A., as depositary of the ADSs, for cancellation with sufficient time to allow for the completion of the delivery and, if applicable, the re-registration of the Ordinary Shares on our Register of Members

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in Hong Kong prior to the Ordinary Shares Record Date, together with (a) delivery instructions for the corresponding Ordinary Shares (including, if applicable, the name and address of person who will be the registered holder of such Ordinary Shares) and (b) payment of the ADS depositary fees associated with such ADS cancellation (US$0.05 per ADS to be cancelled) and any applicable taxes. If ADSs are held in a brokerage firm, bank or other financial institution, please contact the broker, bank or other financial institution to find out what actions need to be taken to instruct the broker, bank or other financial institution to present the ADSs for cancellation. Please be aware that there are no guarantees of timely delivery or re-registration of Ordinary Shares prior to the Ordinary Shares Record Date due to the time differences between Eastern Daylight time and Hong Kong time, and the time required to process the ADS cancellations, the delivery of Ordinary Shares in Hong Kong and, if applicable, the re-registration of Ordinary Shares on our Register of Members in Hong Kong.

Details including the date and location of our Annual General Meeting will be set out in our notice of Annual General Meeting to be issued and provided to holders of our Ordinary Shares and ADSs as of the respective Record Date together with the proxy materials in due course.

By order of the Board Zai Lab Limited Samantha Du Director, Chairperson and Chief Executive Officer

Hong Kong April 13, 2021

As at the date of this announcement, the board of directors of the Company comprises Dr. Samantha Du and Mr. Tao Fu as the directors, and Dr. Kai-Xian Chen, Dr. John Diekman, Ms. Nisa Leung, Mr. William Lis, Mr. Leon O. Moulder, Jr. and Mr. Peter Wirth as the independent directors.

• For identification only

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