Core Viewpoint - Changyuan Donggu's main business focuses on the research, production, and sales of core engine components, including diesel, gasoline, and natural gas engine cylinder blocks, cylinder heads, and connecting rods [1] Group 1: Business Overview - The company primarily serves large engine and vehicle manufacturers, including Foton Cummins, Dongfeng Cummins, Xi'an Cummins, Chongqing Cummins, Dongfeng Commercial Vehicle, Guangxi Yuchai, Shanghai Diesel, SANY Heavy Industry, BYD, and Seres [1] - There is no reliance on a single customer, mitigating customer dependency risks [1] Group 2: Clientele - The company has a diverse customer base, which includes several major players in the engine and vehicle manufacturing industry [1] - Detailed data on the top five customers can be found in the company's periodic reports [1]

Group 1 - The company held a performance briefing for Q3 2025 on November 25, 2025, from 16:00 to 17:00, via the Shanghai Stock Exchange's online platform [1] - Key executives, including the General Manager and independent directors, participated in the briefing to interact with investors and address their concerns [1] - The company announced the briefing in advance on November 20, 2025, through the Shanghai Stock Exchange website and designated media [1] Group 2 - The main customers for the company's diesel and natural gas engine cylinder blocks and cylinder heads include major manufacturers such as Foton Cummins, Dongfeng Cummins, and Yuchai [2] - The company has been focusing on expanding its market presence and customer base, enhancing production capacity to support long-term growth [2] - The joint venture with Guangxi Jinchuan Automotive Parts Manufacturing Co., Ltd. for large-diameter diesel generator sets has a revenue and gross profit that do not directly consolidate into the company's financial statements [2] - The company is unable to disclose the name of a specific customer due to confidentiality agreements related to a project announced on October 27, 2025 [2]