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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13A-16 OR 15D-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2020

Commission Filing Number: 001-38205

ZAI LAB LIMITED

(Translation of registrant’s name into English)

4560 Jinke Road, Bldg. 1, 4F, Pudong, Shanghai, China 201210

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F: Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

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EXHIBIT INDEX

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Exhibit No. |  | Description
​ | ​ | ​
23.1 | ​ | Consent of Deloitte Touche Tohmatsu Certified Public Accountants LLP
99.1 | ​ | Consolidated Financial Statements as of June 30, 2020 and for the six months ended June 30, 2019 (unaudited) and 2020
101.INS | ​ | Inline XBRL Instance Document - this instance document does not appear in the Interactive Data File because its XBRL tags are not embedded within the Inline XBRL document
101.SCH | ​ | Inline XBRL Taxonomy Extension Schema
101.CAL | ​ | Inline XBRL Taxonomy Extension Calculation Linkbase
101.DEF | ​ | Inline XBRL Taxonomy Extension Definition Linkbase
101.LAB | ​ | Inline XBRL Taxonomy Extension Label Linkbase
101.PRE | ​ | Inline XBRL Taxonomy Extension Presentation Linkbase

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

​ | ​ | ​
​ | ZAI LAB LIMITED
​ | ​ | ​
​ | By: | /s/ Billy Cho
​ | Name: | Billy Cho
​ | Title: | Chief Financial Officer
Date: September 11, 2020 | ​ | ​

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