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

Reporting relationship: Chief Financial Officer
Issuer ticker: ZLAB
Reported as of: 04 Mar 2026
Net transaction value: -$31,723
SEC form: 4
Accepted by SEC: 16 Mar 2026, 16:08:21 UTC
Prior SEC filing: 04 Nov 2025
Next SEC filing: 08 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Bruce Blefeld, Attorney-in-Fact

Key filing fact

Yajing Chen filed Form 4 for Zai Lab Ltd (ZLAB) on 16 Mar 2026.

Key facts

This page summarizes Yajing Chen's Form 4 filing for Zai Lab Ltd (ZLAB).
5 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 16 Mar 2026, 16:08.

Change

Previous filing in this sequence was filed on 04 Nov 2025.
Current net transaction value: -$31,723.

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: 16 Mar 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: +4,258
Change %: +24%
Price
Shares after: 21,702
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F2, F3

ZLAB transaction

American Depositary Shares

Sale

Transaction value: $31,723
Shares: -1,703
Change %: -7.8%
Price: $18.63
Shares after: 19,999
Date: 13 Mar 2026
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

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

ZLAB transaction Derivative

Stock Options (Right to Buy)

Award

Transaction value
Shares: +83,160
Change %
Price: $0.000000^*
Shares after: 83,160
Date: 04 Mar 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 83,160
Exercise price: $19.27
Footnotes: F1, F5

ZLAB transaction Derivative

Restricted Share Units

Award

Transaction value
Shares: +27,027
Change %
Price: $0.000000^*
Shares after: 27,027
Date: 04 Mar 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 27,027
Exercise price
Footnotes: F1, F3, F6

ZLAB transaction Derivative

Restricted Share Units

Options Exercise

Transaction value
Shares: -4,258
Change %: -25%
Price: $0.000000^*
Shares after: 12,777
Date: 12 Mar 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 4,258
Exercise price
Footnotes: F1, F3, F7

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 7 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 sold automatically to cover taxes upon vesting of RSUs.

Footnote 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.

Footnote 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.

Footnote 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.