30 December 2025 NIU HOLDINGS LIMITED (Incorporated in the Cayman Islands with limited liability) （於開曼群島註冊成立之有限公司） (Stock Code: 8619) （股份代號：8619） NOTIFICATION LETTER 通知信函 Dear Registered Shareholder(s), The following document(s) of NIU Holdings Limited (the "Company") has/have been prepared in English and Chinese and is/are available on the websites of the Company at www.niuholdings.com.hk and The Stock Exchange of Hong Kong Limited at www.hkexnews.hk (collectively "Websites"):- • Interim Report 2025 of the ...