[6-K] Hesai Group American Depositary Share, each ADS represents one Class B ordinary share Current Report (Foreign Issuer)

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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 UNDER
THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2025

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Commission File Number: 001-41611

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Hesai Group

10th Floor, Building A
No. 658 Zhaohua Road, Changning District
Shanghai 200050
People’s Republic of China

(Address of principal executive offices)​

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

​ Form 20-F      ☒       ​ ​ Form 40-F      ☐       ​

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Exhibit Index

​	99.1	​	​	Hesai Group Supplemental and Updated Disclosures	​
​	99.2	​	​	Consolidated Financial Statements of Hesai Group as of and for the Three Months Ended March 31, 2025	​
​	99.3	​	​	Unaudited Condensed Consolidated Financial Statements of Hesai Group as of and for the Six Months Ended June 30, 2025	​

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SIGNATURES

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

​	​	​	​	Hesai Group							​
​	​	​	​	By:	​	​	/s/ Yifan Li ​				​
​	​	​	​	​	​	​	Name:	​	​	Yifan Li	​
​	​	​	​	​	​	​	Title:	​	​	Chief Executive Officer	​

Date: September 2, 2025

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