Yajing Chen - 01 Oct 2026 Form 4 Insider Report for Zai Lab Ltd (ZLAB)

Reporting relationship: Chief Financial Officer
Issuer ticker: ZLAB
Reported as of: 01 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Oct 2026, 16:44:49 UTC
Prior SEC filing: 21 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Bruce Blefeld, Attorney-in-Fact

Filing notes and source

Key filing fact

Yajing Chen filed Form 4 for Zai Lab Ltd (ZLAB) on 05 Oct 2026.

Key facts

This page summarizes Yajing Chen's Form 4 filing for Zai Lab Ltd (ZLAB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Oct 2026, 16:44.

Change

Previous filing in this sequence was filed on 21 Aug 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001985694 Primary reporting owner

Chen Yajing

Relationship: Chief Financial Officer
Address: C/O ZAI LAB LIMITED, 314 MAIN STREET, 4TH FLOOR, SUITE 100, CAMBRIDGE
Signature: /s/ Bruce Blefeld, Attorney-in-Fact
Signature date: 05 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ZLAB transaction

American Depositary Shares

Options Exercise

Transaction value
Shares: +920
Change %: +2.6%
Price
Shares after: 36,555
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1, F2, F3

ZLAB transaction

American Depositary Shares

Tax liability

Transaction value
Shares: -315
Change %: -0.86%
Price: $25.50^*
Shares after: 36,240
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ZLAB transaction Derivative

Restricted Share Units

Options Exercise

Transaction value
Shares: -920
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 01 Oct 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 920
Exercise price
Footnotes: F1, F3, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote 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.

Footnote F2

ADSs acquired upon vesting of Restricted Share Units ("RSUs").

Footnote F3

Each RSU represents a contingent right to receive one ADS.

Footnote F4

These ADSs were withheld to cover taxes upon vesting of RSUs.

Footnote F5

The RSUs vested in equal annual installments over five years beginning on 10/01/2022, the first anniversary of the date of grant. Vested shares were delivered to the reporting person following vesting.