X0508 4 2025-07-02 0001704292 Zai Lab Ltd ZLAB 0001731790 Du Ying C/O ZAI LAB LIMITED 314 MAIN STREET, 4TH FLOOR, SUITE 100 CAMBRIDGE MA 02142 true true Chairperson & CEO false Restricted Share Units 2025-07-02 4 A 0 44194 0 A American Depositary Shares 44194 44194 D Each Restricted Share Unit ("RSU") represents a contingent right to receive one American Depositary Share ("ADS"). The RSUs vest in equal annual installments over four years beginning on 07/02/2026, the first anniversary of the date of grant, subject to continuous service. Vested shares will be delivered in the form of ADSs to the reporting person following vesting. Each ADS represents ten Ordinary Shares of the issuer. Our ADSs and Ordinary Shares are fully fungible. For purposes of this Form 4, we are reporting this in terms of ADSs. /s/ Bruce Blefeld, Attorney-in-Fact 2025-07-07