 BEIJING, April 09, 2021 GLOBE NEWSWIRE -- Niu Technologies NIU, or the Company NASDAQ: NIU, the worlds leading provider of smart urban mobility solutions, announced today that it filed its annual report on Form 20-F for the fiscal year ended December 31, 2020 with the Securities and Exchange Commission SEC. The annual report can be accessed on the Companys investor relations website at ir.niu.com as well as the SECs website at 