CHEN YAJING (Chief Financial Officer) sold 13.8% of their position (5.20K shares) of ZAI LAB LTD on the open market

Open‑market sale worth $106.0K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

CHEN YAJING

Filed: 4/3/2026ACC: 0000905148-26-001543

InsiderCHEN YAJINGCIK 1985694

→

IssuerZAI LAB LTDCIK 1704292

Officer· Chief Financial Officer

Since Mar 2026

+6.72K

Net shares

Net buyer

$106.0K

Total sold

Open market trades

0B · 1S

Total transactions

29.68K acquired · 22.96K disposed

Non-Derivative Transactions4

American Depositary Shares

Direct

M · Option Exercise

+1.50K

Price / share

—

Trade value

—

% of position

7.5%

4/1/2026

20K→21.50K

American Depositary Shares

Direct

M · Option Exercise

+13.76K

Price / share

—

Trade value

—

% of position

64.0%

4/1/2026

21.50K→35.26K

American Depositary Shares

Direct

M · Option Exercise

+2.50K

Price / share

—

Trade value

—

% of position

7.1%

4/2/2026

35.26K→37.76K

American Depositary Shares

Direct

S · Sale

−5.20K

Price / share

$20.39

Trade value

$106.01K

% of position

13.8%

4/2/2026

37.76K→32.56K

Total

Net shares

+12.56K

Net value

-$106.01K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
American Depositary Shares Direct	4/1/2026	M · Option Exercise	+1.50K	—	—	7.5%	20K	21.50K
American Depositary Shares Direct	4/1/2026	M · Option Exercise	+13.76K	—	—	64.0%	21.50K	35.26K
American Depositary Shares Direct	4/2/2026	M · Option Exercise	+2.50K	—	—	7.1%	35.26K	37.76K
American Depositary Shares Direct	4/2/2026	S · Sale	−5.20K	$20.39	$106.01K	13.8%	37.76K	32.56K
Total			+12.56K		-$106.01K

Derivative Transactions4

Performance-Based Share Units

Direct

A · Award

Converts to

American Depositary Shares

11.92K shares

+11.92K

Strike price

Held after

11.92K

Exercisable

—

3/4/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

American Depositary Shares

1.50K shares

−1.50K

Strike price

Held after

1.50K

Exercisable

—

4/1/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

American Depositary Shares

13.76K shares

−13.76K

Strike price

Held after

27.52K

Exercisable

—

4/1/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

American Depositary Shares

2.50K shares

−2.50K

Strike price

Held after

2.50K

Exercisable

—

4/2/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Performance-Based Share Units Direct	American Depositary Shares11.92K shares	3/4/2026	A · Award	+11.92K	—	11.92K
Restricted Share Units Direct	American Depositary Shares1.50K shares	4/1/2026	M · Option Exercise	−1.50K	—	1.50K
Restricted Share Units Direct	American Depositary Shares13.76K shares	4/1/2026	M · Option Exercise	−13.76K	—	27.52K
Restricted Share Units Direct	American Depositary Shares2.50K shares	4/2/2026	M · Option Exercise	−2.50K	—	2.50K