DU YING (Chairwoman & CEO) sold 8.2% of their position (100K shares) of ZAI LAB LTD on the open market

Open‑market sale worth $2.00M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

DU YING

Filed: 5/15/2026ACC: 0000905148-26-002403

InsiderDU YINGCIK 1731790

→

IssuerZAI LAB LTDCIK 1704292

DirectorOfficer· Chairwoman & CEO

Since Jan 2021

-100K

Net shares

Net seller

$2.00M

Total sold

Open market trades

0B · 3S

Total transactions

100K acquired · 200K disposed

Non-Derivative Transactions5

American Depositary Shares

Direct

M · Option Exercise

+50K

Price / share

$1.74

Trade value

$87K

% of position

4.5%

5/13/2026

1.12M→1.17M

American Depositary Shares

Direct

S · Sale

−16.23K

Price / share

$19.44

Trade value

$315.58K

% of position

1.4%

5/13/2026

1.17M→1.16M

American Depositary Shares

Direct

S · Sale

−33.77K

Price / share

$20.22

Trade value

$682.89K

% of position

2.9%

5/13/2026

1.16M→1.12M

American Depositary Shares

Direct

M · Option Exercise

+50K

Price / share

$1.74

Trade value

$87K

% of position

4.5%

5/14/2026

1.12M→1.17M

American Depositary Shares

Direct

S · Sale

−50K

Price / share

$20.09

Trade value

$1M

% of position

4.3%

5/14/2026

1.17M→1.12M

Total

Net shares

+0.00

Net value

-$1.83M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
American Depositary Shares Direct	5/13/2026	M · Option Exercise	+50K	$1.74	$87K	4.5%	1.12M	1.17M
American Depositary Shares Direct	5/13/2026	S · Sale	−16.23K	$19.44	$315.58K	1.4%	1.17M	1.16M
American Depositary Shares Direct	5/13/2026	S · Sale	−33.77K	$20.22	$682.89K	2.9%	1.16M	1.12M
American Depositary Shares Direct	5/14/2026	M · Option Exercise	+50K	$1.74	$87K	4.5%	1.12M	1.17M
American Depositary Shares Direct	5/14/2026	S · Sale	−50K	$20.09	$1M	4.3%	1.17M	1.12M
Total			+0.00		-$1.83M

Derivative Transactions2

Stock Options (Right to Buy)

Direct

M · Option Exercise

Converts to

American Depositary Shares

50K shares

−50K

Strike price

1.74

Held after

411.09K

Exercisable

—

5/13/2026

Stock Options (Right to Buy)

Direct

M · Option Exercise

Converts to

American Depositary Shares

50K shares

−50K

Strike price

1.74

Held after

361.09K

Exercisable

—

5/14/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Options (Right to Buy) Direct	American Depositary Shares50K shares	5/13/2026	M · Option Exercise	−50K	1.74	—	411.09K
Stock Options (Right to Buy) Direct	American Depositary Shares50K shares	5/14/2026	M · Option Exercise	−50K	1.74	—	361.09K