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 April 2023 Commission File Number: 001-38696 NIU TECHNOLOGIES No.1 Building, No. 195 Huilongguan East Road, Changping District, Beijing 102208 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 ...