SCHEDULE 13G/A 0001415889-25-004215 0001780948 XXXXXXXX LIVE 1 Class B ordinary shares, par value US$0.0001 per share, represented by American Depository Shares 03/31/2025 0001861737 Hesai Group 428050108 9th Floor, Building L2-B 1588 Zhuguang Road, Qingpu District Shanghai F4 201702 Rule 13d-1(d) Lightspeed Opportunity Fund, L.P. b E9 0.00 0.00 0.00 0.00 0.00 0.0 PN Lightspeed General Partner Opportunity Fund, L.P. b E9 0.00 0.00 0.00 0.00 0.00 0.0 PN Lightspeed Ultimate General Partner Opportunity Fund, Ltd. b E9 0.00 0.00 0.00 0.00 0.00 0.0 OO Arif Janmohamed b X1 0.00 0.00 0.00 0.00 0.00 0.0 IN Ravi Mhatre b X1 0.00 0.00 0.00 0.00 0.00 0.0 IN Hesai Group 9th Floor, Building L2-B, 1588 Zhuguang Road, Qingpu District, Shanghai, F4, 201702. The names of the persons filing this report (collectively, the "Reporting Persons") are: Lightspeed Opportunity Fund, L.P. ("Opportunity") Lightspeed General Partner Opportunity Fund, L.P. ("LGP") Lightspeed Ultimate General Partner Opportunity Fund, Ltd. ("LUGP") Arif Janmohamed ("Janmohamed") Ravi Mhatre ("Mhatre") The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G. c/o Lightspeed Venture Partners 2200 Sand Hill Road Menlo Park, CA 94025 Opportunity Cayman Islands LGP Cayman Islands LUGP Cayman Islands Janmohamed United States Mhatre United States Y There is no CUSIP number assigned to the Class B ordinary shares. CUSIP number 428050108 has been assigned to the American Depositary Shares ("ADSs") of the Issuer. Each ADS represents one Class B ordinary share. Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of shares of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentage of the Issuer's Class B ordinary shares beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. N Y Y Y Y Y Y Exhibit 99.1 Joint Filing Agreement Lightspeed Opportunity Fund, L.P. /s/ Ravi Mhatre 05/15/2025 Lightspeed General Partner Opportunity Fund, L.P. /s/ Ravi Mhatre 05/15/2025 Lightspeed Ultimate General Partner Opportunity Fund, Ltd. /s/ Ravi Mhatre 05/15/2025 Arif Janmohamed /s/ Arif Janmohamed 05/15/2025 Ravi Mhatre /s/ Ravi Mhatre 05/15/2025 Note 1: By Lightspeed General Partner Opportunity Fund, L.P., its General Partner, By Lightspeed Ultimate General Partner Opportunity Fund, Ltd., its General Partner, By Ravi Mhatre, Duly Authorized Signatory