Zai Lab (ZLAB) Form 144: 50,000 ADS Proposed Sale Worth $1.71M

Zai Lab Limited (ZLAB) filed a Form 144 reporting a proposed sale of 50,000 American Depositary Shares (ADSs) through Fidelity Brokerage on 08/12/2025 for an aggregate market value of $1,712,555.53.

Rhea-AI Filing Summary

Zai Lab Limited (ZLAB) filed a Form 144 reporting a proposed sale of 50,000 American Depositary Shares (ADSs) through Fidelity Brokerage on 08/12/2025 for an aggregate market value of $1,712,555.53. The form shows the ADSs were acquired on 08/12/2025 from the issuer upon exercise of an option originally granted on 10/22/2015, with payment in cash. The filing lists 421,725,450 shares outstanding, so the proposed block equals about 0.0119% of outstanding ADSs.

The notice also discloses prior dispositions by the same seller (listed as Ying Du) over the past three months totaling 284,048 ADSs for gross proceeds of $9,022,707.36 (sales dated 05/12/2025–08/11/2025). Sales are reported on NASDAQ and routed through Fidelity Brokerage Services LLC.

Positive

• Transparent Rule 144 disclosure of the proposed sale and prior transactions, demonstrating compliance with SEC reporting requirements.
• Planned sale arose from option exercise (option granted 10/22/2015; acquired 08/12/2025), with cash payment, indicating a standard liquidity event rather than a noncompliant transfer.
• Brokerage identified (Fidelity Brokerage Services LLC) and exchange listed (NASDAQ), providing clear execution channels for the transactions.

Negative

• Cumulative insider dispositions of 284,048 ADSs in the past three months totaling $9,022,707.36, plus a proposed sale of 50,000 ADSs (~$1.71M), which may be viewed negatively by some investors.
• Repeated sales by the same individual (Ying Du) across May–August 2025 could raise questions about insider selling patterns, even though amounts are small relative to outstanding shares.

Insights

Financial Analyst

TL;DR: Small, transparent insider sales; absolute proceeds notable but represent a tiny fraction of outstanding ADSs.

The filing documents a proposed sale of 50,000 ADSs (~0.0119% of outstanding) following an option exercise, with the seller having sold 284,048 ADSs for ~$9.02M in the prior three months. From a capital-markets perspective, these transactions provide liquidity to the holder but are unlikely to materially affect Zai Lab's market capitalization given the very small percentage of shares involved. Investors should view this as routine insider selling disclosed under Rule 144 rather than a company operational disclosure.

Corporate Governance Expert

TL;DR: Repeated insider dispositions are disclosed properly, but cumulative sales may raise governance or signaling questions for some investors.

The Form 144 shows consistent, documented sales by the same individual across multiple dates and a new proposed disposition tied to an option exercise. While the absolute amounts (~$9.02M over three months plus the planned ~$1.71M sale) are factual and the filer complied with reporting requirements, recurrent insider sales can attract investor scrutiny on insider confidence or personal liquidity needs. The filing itself contains no nonpublic operational information and adheres to Rule 144 disclosure norms.

FAQ

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

What does ZLAB's Form 144 report?

The Form 144 reports a proposed sale of 50,000 ADSs of Zai Lab (ZLAB) through Fidelity on 08/12/2025 with aggregate market value $1,712,555.53.

Who is listed as the seller in the Form 144 filings for ZLAB?

Recent sales in the filing list Ying Du as the seller for multiple transactions dated 05/12/2025–08/11/2025.

How many ADSs has the seller disposed of recently and for how much?

The seller disposed of 284,048 ADSs in the past three months for gross proceeds of $9,022,707.36 (sales dated 05/12/2025 to 08/11/2025).

What is the source and nature of the ADSs being sold on 08/12/2025?

The ADSs were acquired on 08/12/2025 from the issuer upon exercise of an option granted 10/22/2015; payment is shown as cash.

What proportion of outstanding ADSs does the proposed 50,000 ADS sale represent?

With 421,725,450 shares outstanding, the 50,000 ADS proposed sale equals approximately 0.0119% of outstanding ADSs.

Through which broker and exchange will the sale occur?

The proposed sale is routed through Fidelity Brokerage Services LLC and listed for sale on NASDAQ.

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

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Accepted by SEC EDGAR 08/12/2025 - 04:45 PM Learn about SEC filing dates

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 201203
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	50000	1712555.53	421725450	08/12/2025	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	08/12/2025	Option Granted - 10/22/2015	Issuer			50000	08/12/2025	Cash

* 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 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/12/2025	50000	1472165.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/13/2025	50000	1428650.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/14/2025	46389	1302858.26
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	06/26/2025	23669	855196.47
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	06/30/2025	6918	245723.90
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	07/02/2025	7072	249143.73
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	08/08/2025	50000	1737155.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	08/11/2025	50000	1731815.00

144: Remarks and Signature

Remarks
Date of Notice	08/12/2025
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/20/2024
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/ Joshua Schmitt, 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)