6-K - HSAI - Equibles

UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATEISSUER

PURSUANT TO RULE 13a-16OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2026

Commission File Number: 001-41611

HesaiGroup

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 x     Form 40-F ¨

Exhibit Index

99.1	Announcement – Date of Board Meeting

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: April 27, 2026

Exhibit 99.1

Hong Kong Exchangesand Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make norepresentation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising fromor in reliance upon the whole or any part of the contents of this announcement.

HesaiGroup

禾賽科技 *

(Acompany controlled through weighted voting rights and incorporated in the Cayman Islands with limited liability)

(HKEXStock Code: 2525)

(NASDAQStock Ticker: HSAI)

DATEOF BOARD MEETING

The board of directors (the “Board”) of Hesai Group (the “Company”) hereby announces that a meeting of the Board will be held on May 19, 2026 (Tuesday, Beijing/Hong Kong Time), for the purpose of considering and approving, among other matters, the unaudited quarterly results of the Company and its subsidiaries for the three months ended March 31, 2026 and its publication.

The Company’s management will host an earnings conference call at 8:00 A.M. (U.S. Eastern Time)/8:00 P.M. (Beijing/Hong Kong Time) on May 19, 2026, Tuesday). For participants who wish to join the call by phone, please access the link provided below to complete the pre-registration and dial in 5 minutes prior to the scheduled call start time. Upon registration, each participant will receive dial-in details to join the conference call.

Event Title:	Hesai<br> Group First Quarter 2026 Earnings Conference Call
Pre-registration Link:	https://s1.c-conf.com/diamondpass/10054272-8nlxqj.html

Additionally, a live and archived webcast of the conference call will be available on the Company’s investor relations website at https://investor.hesaitech.com.

By order of the<br> Board
Hesai Group
Dr. Yifan Li
Chairman of the Board,<br> Executive Director and Chief Executive Officer

Hong Kong, April 27, 2026

As at the dateof this announcement, the Board comprises: (i) Dr. Yifan Li, Dr. Kai Sun, Mr. Shaoqing Xiang and Ms. CailianYang as the executive Directors; and (ii) Ms. Yi Zhang, Mr. Jia Ren and Dr. Hui Wang as the independent non-executiveDirectors.

* For identificationpurpose only