Zai Lab CFO receives 920 depositary shares

The RSUs vested in equal annual installments over five years beginning October 1, 2022.

Rhea-AI Filing Summary

Zai Lab Ltd (ZLAB) Chief Financial Officer Yajing Chen reported that 920 restricted share units vested on October 1, 2026, and 920 American Depositary Shares were delivered. 315 ADSs were withheld to cover taxes upon vesting; the reported price for those withheld ADSs was $25.50 per share. Each ADS represents ten Ordinary Shares.

Insider Trade Summary

920 shares exercised/converted

Exercise 3 txns

Insider Chen Yajing

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F3, F5, F1	920	$0.00	$0.00
Exercise	American Depositary Shares F1, F2, F3	920	--	--
Tax Withholding	American Depositary Shares F1, F4	315	$25.50	$8K

Holdings After Transaction: Restricted Share Units — 0 contracts (Direct); American Depositary Shares — 36,240 shares (Direct)

Footnotes (5)

1. 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.
2. F2. ADSs acquired upon vesting of Restricted Share Units ("RSUs").
3. F3. Each RSU represents a contingent right to receive one ADS.
4. F4. These ADSs were withheld to cover taxes upon vesting of RSUs.
5. 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.

Key Figures

RSUs vested: 920 restricted share units ADSs delivered: 920 American Depositary Shares ADSs withheld for taxes: 315 American Depositary Shares +3 more

6 metrics

RSUs vested 920 restricted share units October 1, 2026

ADSs delivered 920 American Depositary Shares Upon vesting of the RSUs on October 1, 2026

ADSs withheld for taxes 315 American Depositary Shares Upon RSU vesting on October 1, 2026

Reported price for withheld ADSs $25.50 per share Tax withholding transaction on October 1, 2026

ADS ratio 10 Ordinary Shares per ADS As stated for the issuer's ADSs

RSU vesting period 5 years Equal annual installments beginning October 1, 2022

Key Terms

Restricted Share Units, American Depositary Share, contingent right, fully fungible

4 terms

Restricted Share Units financial

"ADSs acquired upon vesting of Restricted Share Units"

Restricted share units (RSUs) are a promise from a company to give an employee or service provider actual shares or cash equal to the shares after certain conditions are met, typically staying with the company for a set time or hitting performance targets. Think of them like a time-locked gift card that becomes usable only after you’ve earned it. For investors, RSUs matter because they align employee incentives with company performance and can increase the number of shares outstanding over time, diluting existing ownership and affecting earnings per share.

American Depositary Share financial

"Each American Depositary Share ("ADS") represents ten Ordinary Shares"

An American Depositary Share (ADS) is a U.S.-listed certificate that represents a specified number of shares in a foreign company, held by a custodian bank; it works like a receipt that allows U.S. investors to buy and trade foreign equity on American exchanges without dealing with another country’s markets. Investors care because ADSs make foreign stocks easier to access, improve liquidity and settlement in dollars, and can affect dividend payments, voting rights and regulatory oversight compared with buying the underlying foreign shares directly.

contingent right financial

"Each RSU represents a contingent right to receive one ADS"

fully fungible technical

"ADSs and Ordinary Shares are fully fungible"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ZLAB ADS did CFO Yajing Chen receive?

Yajing Chen received 920 American Depositary Shares when 920 restricted share units vested on October 1, 2026. Each ADS represents ten Ordinary Shares, and the ADSs and Ordinary Shares are fully fungible.

How many ZLAB ADS were withheld for taxes?

315 American Depositary Shares were withheld to cover taxes upon vesting of the restricted share units on October 1, 2026. The reported price for those withheld ADSs was $25.50 per share.

What was the vesting schedule for Yajing Chen's ZLAB RSUs?

The RSUs vested in equal annual installments over five years, beginning on October 1, 2022, the first anniversary of the grant date. Vested shares were delivered following vesting.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/05/2026 - 04:45 PM Accepted by SEC EDGAR 10/05/2026 - 04:44 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Chen Yajing

(Last) (First) (Middle)

C/O ZAI LAB LIMITED

314 MAIN STREET, 4TH FLOOR, SUITE 100

(Street)

CAMBRIDGE MASSACHUSETTS 02142

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Zai Lab Ltd [ ZLAB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
American Depositary Shares(1)	10/01/2026		M		920(2)	A	(3)	36,555	D
American Depositary Shares(1)	10/01/2026		F		315(4)	D	$25.5	36,240	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Units	(3)	10/01/2026		M			920	(5)	(5)	American Depositary Shares(1)	920	$0	0	D

Explanation of Responses:

1. 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.

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

3. Each RSU represents a contingent right to receive one ADS.

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

5. 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.

	/s/ Bruce Blefeld, Attorney-in-Fact	10/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)