The Sigma Group, founded in 1978, primarily focuses on secondary aluminum smelting and metal scrap trading.Sigma has sizeable plants in Taiwan (Kaohsiung) and China (Shanghai, Zhangzhou, Chongqing, Rizhao, Chengdu, and Changchun), with over 1600 employees and annual turnover of 8.2 billion RMB. The Sigma Group plays a vital role in the global aluminum recycling ecosystem, processing scrap metal from sources such as shredded autos to produce specification aluminum alloys. The finished products are sold to manufacturers of auto and motorcycle parts, home appliances, and other industrial and commercial products. We have been the largest recycled aluminum producer in China since domestic operations began in 1993.

Sigma Brothers, Inc., was founded in 1981 in Kaohsiung, and is presently the headquarters of our metals operation. Throughout the years, smelting of secondary aluminum alloy ingots and non-ferrous scrap metal trading has become the main focus for the Sigma Group.The Sigma Group now operates eight smelting plants. The Kaohsiung aluminum alloy smelting plant was established in 1987, with monthly capacity of 6,000 mt. The Shanghai smelting plant was established in 1993, moved to a larger site in 2005, and currently operates with a monthly capacity of 25,000 mt of aluminum alloy ingots, and 3,600 mt of zinc alloy ingots. The Zhangzhou plant was established through a buyout of Tsann Kuen's smelting plant, and has a monthly capacity of 15,000 mt. The Chongqing plant has a monthly capacity of 10,000 mt, the Rizhao plant 10,000 mt, the Chengdu plant 5,000 mt, the Changchun plant 6,500mt, and the Baotou plant 10,000mt. With these 8 smelting plants, the Sigma Group has an annual production capacity of roughly 1,000,000 mt.