Yajing Chen - 04 Mar 2026 Form 4 Insider Report for Zai Lab Ltd (ZLAB)

Role: Chief Financial Officer
Signature: /s/ Bruce Blefeld, Attorney-in-Fact
Issuer symbol: ZLAB
Transactions as of: 04 Mar 2026
Net transactions value: -$31,723
Form type: 4
Filing time: 16 Mar 2026, 16:08:21 UTC
Previous filing: 04 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Chen Yajing	Chief Financial Officer	C/O ZAI LAB LIMITED, 314 MAIN STREET, 4TH FLOOR, SUITE 100, CAMBRIDGE	/s/ Bruce Blefeld, Attorney-in-Fact	16 Mar 2026	0001985694

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ZLAB	American Depositary Shares	Options Exercise		+4,258	+24%		21,702	12 Mar 2026	Direct	F1, F2, F3
transaction	ZLAB	American Depositary Shares	Sale	$31,723	-1,703	-7.8%	$18.63	19,999	13 Mar 2026	Direct	F1, F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ZLAB	Stock Options (Right to Buy)	Award		+83,160		$0.000000^*	83,160	04 Mar 2026	American Depositary Shares	83,160	$19.27	Direct	F1, F5
transaction	ZLAB	Restricted Share Units	Award		+27,027		$0.000000^*	27,027	04 Mar 2026	American Depositary Shares	27,027		Direct	F1, F3, F6
transaction	ZLAB	Restricted Share Units	Options Exercise		-4,258	-25%	$0.000000^*	12,777	12 Mar 2026	American Depositary Shares	4,258		Direct	F1, F3, F7

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each American Depositary Share ("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.
F2	ADSs acquired upon vesting of Restricted Share Units ("RSUs").
F3	Each RSU represents a contingent right to receive one ADS.
F4	These ADSs were sold automatically to cover taxes upon vesting of RSUs.
F5	The option vests in equal annual installments over four years beginning on 03/04/2027, the first anniversary of the date of grant, subject to continuous service.
F6	The RSUs vest in equal annual installments over four years beginning on 03/04/2027, 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.
F7	The RSUs vest in equal annual installments over four years beginning on 03/12/2026, 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.