Zai Lab Executive's $7.6M Combined Stock Sales Raise Investor Attention

Rhea-AI Filing Summary

Zai Lab Director and Officer Ying Du filed Form 144 indicating a proposed sale of 23,669 American Depositary Shares with an aggregate market value of $855,196.47 through Fidelity Brokerage Services. The shares were acquired through restricted stock vesting on June 25, 2025, as part of compensation.

Notable recent trading activity by Du includes:

• Multiple large sales in May 2025 totaling 196,389 shares with combined proceeds of $5.68 million
• Two smaller sales in April 2025 totaling 8,753 shares for $305,978

The filing indicates the sale is partially intended to cover tax obligations from vested equity awards. Du has certified no knowledge of undisclosed material adverse information regarding Zai Lab's operations. The company has 486.85 million shares outstanding, and the proposed sale represents approximately 0.005% of total shares.

Positive

• None.

Negative

• Director and Officer Ying Du has sold 228,811 shares worth approximately $6.85M over the past 3 months, including a recent planned sale of 23,669 shares ($855K), indicating significant insider selling pressure
• The pattern of large sequential sales (three 50,000 share blocks in May 2025) suggests systematic reduction of insider holdings

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001731790
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Zai Lab Ltd
SEC File Number	001-38205
Address of Issuer	4560 JINKE ROAD BLDG. 1, 4F, PUDONG SHANGHAI CHINA 201210
Phone	862161632588
Name of Person for Whose Account the Securities are To Be Sold	Du Ying
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
American Depositary Shares	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	23669	855196.47	486853250	06/26/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
American Depositary Shares	06/25/2025	Restricted Stock Vesting	Issuer			23669	06/25/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Ying Du 4560 Jinke Road Bldg. 1, 4th Floor Pudong Shanghai F4 201210	American Depositary Shares	04/02/2025	5808	208473.51
Ying Du 4560 Jinke Road Bldg. 1, Fourth Floor Pudong Shanghai F4 201210	American Depositary Shares	04/04/2025	2945	97504.53
Ying Du 4560 Jinke Road Bldg. 1, Fourth Floor Pudong Shanghai F4 201210	American Depositary Shares	05/09/2025	50000	1481140.00
Ying Du 4560 Jinke Road Bldg. 1, Fourth Floor Pudong Shanghai F4 201210	American Depositary Shares	05/12/2025	50000	1472165.00
Ying Du 4560 Jinke Road Bldg. 1, Fourth Floor Pudong Shanghai F4 201210	American Depositary Shares	05/13/2025	50000	1428650.00
Ying Du 4560 Jinke Road, Bldg. 1 Fourth Floor Pudong Shanghai F4 201210	American Depositary Shares	05/14/2025	46389	1302858.26

144: Remarks and Signature

Remarks	Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
Date of Notice	06/26/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Ying Du
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many ZLAB shares is insider Ying Du planning to sell according to the Form 144 filed on June 28, 2025?

According to the Form 144 filing, Ying Du plans to sell 23,669 American Depositary Shares of Zai Lab Limited (ZLAB) with an aggregate market value of $855,196.47. The approximate date of sale is indicated as June 26, 2025, and the shares will be sold through Fidelity Brokerage Services LLC on NASDAQ.

How many ZLAB shares has Ying Du sold in the past 3 months before this Form 144 filing?

In the 3 months prior to this filing, Ying Du sold a total of 205,142 American Depositary Shares of ZLAB in multiple transactions: April 2, 2025: 5,808 shares ($208,473.51), April 4, 2025: 2,945 shares ($97,504.53), May 9-14, 2025: 196,389 shares across four transactions totaling approximately $5.68 million.

What is the reason for Ying Du's ZLAB share sale in June 2025?

According to the Form 144's remarks section, the sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution. The shares being sold were acquired through Restricted Stock Vesting on June 25, 2025, as part of compensation.

What positions does Ying Du hold at ZLAB?

According to the Form 144 filing, Ying Du holds dual positions at Zai Lab Limited (ZLAB), serving as both an Officer and Director of the company.

What is the total number of ZLAB shares outstanding as of June 2025?

According to the Form 144 filing, Zai Lab Limited (ZLAB) has 486,853,250 shares or units outstanding at the time of the filing in June 2025.