Aluminum Corporation of China Limited, is a state-owned multinational aluminium company headquartered in Beijing, People's Republic of China. It is a publicly-traded company, listed in Hong Kong and in Shanghai. In 2021, it was the world's largest aluminum producer, ahead of China Hongqiao Group, Rusal and Shandong Xinfa. Chinalco is principally engaged in the extraction of aluminium oxide, electrolysis of virgin aluminium and the processing and production of aluminium as well as traded trading and engineering and technical services. Its primary listing is on the Shanghai Stock Exchange and it is a constituent of the SSE 180 index. It has a secondary listing on the Hong Kong Stock Exchange. The major shareholder of the company was Aluminum Corporation of China known as Chinalco, a state owned enterprise. Wikipedia