Ying Du files Form 144 to sell ADS blocks

Ying Du proposes sale of American Depositary Shares.

Accepted by SEC EDGAR 05/18/2026 - 11:34 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Ying Du proposes sale of American Depositary Shares. The filing lists multiple proposed dispositions of ADSs on various dates in 2026, with repeated entries of 50,000 shares at stated gross proceeds (examples include $958,155 and $1,034,110). The transactions are reported through a broker and noted as cash settlements.

Insights

Securities Compliance Attorney

Routine Form 144 sale notice by an affiliate; procedural disclosure matters most.

The filing lists multiple proposed dispositions of American Depositary Shares by Ying Du on specific 2026 dates with per‑trade amounts and gross proceeds. Form 144 is a notice required when affiliates propose certain sales and does not itself execute trades.

Watch subsequent broker reports and Form 4 or trade confirmations for completed transactions and exact net proceeds; the filing provides per‑trade figures but no aggregate total.

Key Figures

Example sale - 03/04/2026: 50,000 shares Example sale - 05/15/2026: 50,000 shares Smaller dispositions: 1,067 and 5,576 shares +1 more

4 metrics

Example sale - 03/04/2026 50,000 shares 03/04/2026; gross proceeds <money>$958,155</money>

Example sale - 05/15/2026 50,000 shares 05/15/2026; gross proceeds <money>$1,037,110</money>

Smaller dispositions 1,067 and 5,576 shares 03/11/2026 and 04/02/2026; gross proceeds <money>$20,362.09</money> and <money>$113,695.19</money>

Brokerage venue Fidelity Brokerage Services LLC Listed broker address: 900 Salem Street, Smithfield, RI

Key Terms

American Depositary Shares, Form 144, gross proceeds

3 terms

American Depositary Shares financial

"American Depositary Shares | Fidelity Brokerage Services LLC"

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

gross proceeds financial

"50000 | 958155.00 Ying Du"

The total amount of cash a company receives from a financing event or sale before any fees, expenses, taxes or deductions are taken out. Investors watch gross proceeds because it shows the raw scale of new capital being raised—think of it as the paycheck amount before withholdings—which helps assess how much funding is available for operations, growth, debt payoff or how much shareholder dilution might occur once costs are removed.

FAQ

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

What does ZLAB's Form 144 filed by Ying Du mean?

It signals a proposed sale of American Depositary Shares by Ying Du. The filing lists multiple proposed dispositions on specific 2026 dates with per‑trade share counts and gross proceeds.

How many ADS sales are listed in the ZLAB Form 144?

The filing shows multiple individual proposed dispositions, commonly in blocks of 50,000 shares on dates in 2026. The document lists per‑trade gross proceeds for each entry rather than an aggregate total.

Are the sales in ZLAB's Form 144 already completed?

No; Form 144 is a notice of proposed sales by an affiliate and does not confirm execution. Completion and settlement would be evidenced by later broker reports, trade confirmations, or a Form 4 if required.

Where can I find the dollar amounts for the ADS transactions in ZLAB's filing?

Each listed disposition includes a gross proceeds figure next to the trade date, such as $958,155 for a 50,000 share entry on 03/04/2026. The filing shows per‑trade dollar amounts for each row.

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

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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	899 HALEI ROAD BUILDING B, 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	976000.00	340336080	05/18/2026	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	05/18/2026	Option Granted - 08/25/2016	Issuer			50000	05/18/2026	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	03/04/2026	50000	958155.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	03/05/2026	50000	961055.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	03/06/2026	50000	970935.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	03/09/2026	50000	951465.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	03/11/2026	1067	20362.09
Ying Du 899 Halei Road, Building B Pudong Shanghai F4 201203	American Depositary Shares	04/02/2026	5576	113695.19
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	04/06/2026	2653	54249.87
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/13/2026	50000	998470.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/14/2026	50000	1004580.00
Ying Du 899 Halei Road Building B, Pudong Shanghai F4 201203	American Depositary Shares	05/15/2026	50000	1037110.00

144: Remarks and Signature

Remarks
Date of Notice	05/18/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/11/2025
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)