Du Ying - 19 May 2026 Form 4 Insider Report for Zai Lab Ltd (ZLAB)

Reporting relationship: Chairperson & CEO, Director
Issuer ticker: ZLAB
Reported as of: 19 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 May 2026, 16:19:18 UTC
Prior SEC filing: 19 May 2026
Next SEC filing: 28 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Bruce Blefeld, Attorney-in-Fact

Key filing fact

Du Ying filed Form 4 for Zai Lab Ltd (ZLAB) on 21 May 2026.

Key facts

This page summarizes Du Ying's Form 4 filing for Zai Lab Ltd (ZLAB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 21 May 2026, 16:19.

Change

Previous filing in this sequence was filed on 19 May 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 0001731790 Primary reporting owner

Du Ying

Relationship: Chairperson & CEO, Director
Address: C/O ZAI LAB LIMITED, 314 MAIN STREET, 4TH FLOOR, SUITE 100, CAMBRIDGE
Signature: /s/ Bruce Blefeld, Attorney-in-Fact
Signature date: 21 May 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: +261,092
Change %: +23%
Price: $1.74^*
Shares after: 1,383,718
Date: 19 May 2026
Ownership: Direct
Footnotes: F1, F2

ZLAB transaction

American Depositary Shares

Tax liability

Transaction value
Shares: -117,435
Change %: -8.5%
Price: $18.75^*
Shares after: 1,266,283
Date: 19 May 2026
Ownership: Direct
Footnotes: F1, F2

Reported derivative securities

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

ZLAB transaction Derivative

Stock Options (Right to Buy)

Options Exercise

Transaction value
Shares: -261,092
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 19 May 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 261,092
Exercise price: $1.74
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 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

The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 11, 2025.

Footnote F3

The option vested in equal annual installments over five years beginning on August 25, 2017, the first anniversary of the date of grant.