Zai Lab Limited — Board/Management Information 2025

Jun 27, 2025

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited (the “Stock Exchange”) 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.

Zai Lab Limited

再鼎醫藥有限公司*

(Incorporated in the Cayman Islands with limited liability)

(Stock Code: 9688)

RESIGNATION OF JOINT COMPANY SECRETARY AND CHANGE OF AUTHORISED REPRESENTATIVE

The board of directors (the "Board") of Zai Lab Limited (the "Company") announces that Ms. Nelly Au-Yeung ("Ms. Au-Yeung") has resigned, with effect from 27 June 2025, as (i) a joint company secretary of the Company (the "Joint Company Secretary"); and (ii) an authorised representative of the Company (the "Authorised Representative") under Rule 3.05 of the Rules Governing the Listing of Securities on the Stock Exchange (the "Listing Rules").

Ms. Au-Yeung confirmed that she has no disagreement with the Board and there is no matter relating to her resignation that needs to be brought to the attention of the Stock Exchange and the shareholders of the Company.

Upon Ms. Au-Yeung’s resignation as a Joint Company Secretary, the other Joint Company Secretary, Mr. Frazor Titus Edmondson III (“Mr. Edmondson”), who possesses the requisite qualification and experience as required under Rule 3.28 of the Listing Rules, will act as the sole company secretary of the Company with effect from 27 June 2025.

The Board further announces that Mr. Edmondson has also been appointed as an Authorised Representative with effect from 27 June 2025.

The Board would like to take this opportunity to express its gratitude to Ms. Au-Yeung for her contributions to the Company during her tenure of service.

By order of the Board

Zai Lab Limited

Samantha Du

Director, Chairperson and Chief Executive Officer

Hong Kong, June 27, 2025

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As at the date of this announcement, the board of directors of the Company comprises Dr. Samantha Du as a director, and Dr. John Diekman, Dr. Richard Gaynor, Ms. Nisa Leung, Mr. William Lis, Mr. Scott W. Morrison, Mr. Leon O. Moulder, Jr., Mr. Michel Vounatsos and Mr. Peter Wirth as independent directors.

• For identification only

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