Zai Lab CFO sells 619 ADS under trading plan

Zai Lab Ltd Chief Financial Officer Chen Yajing sold 619 American Depositary Shares (ADS) on August 11, 2026 at $25.00 per ADS, leaving 35,072 ADS held directly.

Rhea-AI Filing Summary

Zai Lab Ltd Chief Financial Officer Chen Yajing sold 619 American Depositary Shares (ADS) on August 11, 2026 at $25.00 per ADS, leaving 35,072 ADS held directly. Each ADS represents ten Ordinary Shares. The sale was executed under a Rule 10b5-1 trading plan adopted on December 9, 2025.

Insider Trade Summary 10b5-1

Net Seller: 619 shares

Net Sell 1 txn

Insider Chen Yajing

Role Chief Financial Officer

Sold 619 shs ($15K)

Type	Security	Shares	Price	Value
Sale	American Depositary Shares F1, F2	619	$25.00	$15K

Holdings After Transaction: American Depositary Shares — 35,072 shares (Direct)

Footnotes (2)

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. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025.

Key Figures

Shares sold: 619 ADS Sale price: $25.00 per ADS Holdings after sale: 35,072 ADS +2 more

5 metrics

Shares sold 619 ADS American Depositary Shares sold on August 11, 2026

Sale price $25.00 per ADS Price for the 619 ADS sale on August 11, 2026

Holdings after sale 35,072 ADS Directly owned by reporting person following the transaction

ADS to Ordinary ratio 1 ADS = 10 Ordinary Shares Each American Depositary Share represents ten Ordinary Shares

10b5-1 plan adoption date December 9, 2025 Date the Rule 10b5-1 trading plan was adopted

Key Terms

American Depositary Share, Rule 10b5-1 trading plan, fully fungible

3 terms

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.

Rule 10b5-1 trading plan regulatory

"The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

fully fungible financial

"Our ADSs and Ordinary Shares are fully fungible"

FAQ

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

What insider transaction did Zai Lab (ZLAB) report for its CFO?

Zai Lab reported that CFO Chen Yajing sold 619 ADS on August 11, 2026 at $25.00 per ADS. After this open-market sale, the reporting person directly held 35,072 ADS of Zai Lab Ltd.

At what price were the Zai Lab (ZLAB) shares sold in this Form 4?

The reported sale was executed at $25.00 per ADS. The transaction involved 619 ADS, representing American Depositary Shares of Zai Lab, and was classified as a sale in an open market or private transaction.

How many Zai Lab (ZLAB) shares does the CFO hold after the reported sale?

Following the transaction, the reporting person directly holds 35,072 ADS of Zai Lab. Each ADS represents ten Ordinary Shares, and the filing reports these holdings in terms of ADS rather than underlying Ordinary Shares.

Was the Zai Lab (ZLAB) CFO’s sale under a Rule 10b5-1 trading plan?

Yes. The filing states the sale was effected under a Rule 10b5-1 trading plan. The plan was adopted by the reporting person on December 9, 2025, indicating the trade was pre-arranged rather than discretionary at the time of sale.

What does each Zai Lab (ZLAB) American Depositary Share represent?

Each Zai Lab American Depositary Share (ADS) represents ten Ordinary Shares of the issuer. The company notes that its ADSs and Ordinary Shares are fully fungible and that this Form 4 reports positions in terms of ADSs.

Who is the insider involved in this Zai Lab (ZLAB) Form 4 filing?

The reporting person is Chen Yajing, who serves as Chief Financial Officer of Zai Lab Ltd. The Form 4 reflects a single sale transaction of 619 ADS and the resulting direct ownership of 35,072 ADS.

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

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Available on EDGAR 08/13/2026 - 04:15 PM Accepted by SEC EDGAR 08/13/2026 - 04:15 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).

X

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)
08/11/2026

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)	08/11/2026		S(2)		619	D	$25	35,072	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

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. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025.

	/s/ Bruce Blefeld, Attorney-in-Fact	08/13/2026
	** 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)