Cosmo Oil dates back to an April 1986 merger of Daikyo Oil, Maruzen Oil and the former Cosmo Oil, which specialized in oil refining. The company subsequently absorbed Asia Oil. These events made Cosmo one of Japan's preeminent oil wholesalers and distributors. Since Showa Shell accounts for all of its sales, the company enjoys very stable earnings. Produces and sells oil products.
Mainstays are heavy oil, lubricants and asphalt.
The only specialized domestic oil wax maker. Main line is paraffin wax. Expanding supplies from Malaysia. Main line is manufacture and sales of asphalt emulsion for roads. Also, manufacture and sales of asphalt-related engineering materials and waterproofing materials.