Zai Lab Limited — Report Publication Announcement 2021

Jul 27, 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)

NOTICE OF BOARD ACTION AND DATE OF PUBLICATION OF 2021 INTERIM RESULTS ANNOUNCEMENT

The audit committee of our board of directors will consider and approve, among other matters, our unaudited interim results for the three and six months ended June 30, 2021 (“ Results ”) on Monday, August 9, 2021 (Hong Kong time). If approved, we will announce our Results at or around 8:00 p.m. on the website of the The Stock Exchange of Hong Kong Limited at http://www.hkexnews.hk and our Company website at http://www.zailaboratory.com.

After the Results have been approved and released, our management plans to host a live earnings teleconference call and webcast on Monday, August 9, 2021 (Hong Kong time) to discuss the Results and answer questions. Interested parties may access the live webcast via the Company’s website at http://ir.zailaboratory.com. Participants must register in advance of the conference call through the link provided below. Upon registering, each participant will be provided with participant dial-in number, a passcode and a unique access PIN.

Registration link: http://apac.directeventreg.com/registration/event/7290113 Conference ID: 7290113

A replay will be available shortly after the call and can be accessed by visiting the Company’s website at http://ir.zailaboratory.com.

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

Hong Kong July 27, 2021

As at the date of this announcement, the board of directors of the Company comprises Dr. Samantha Du as the director, 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