Nihon Seiko Co., Ltd. engages in the manufacture and sale of antimony products and atomized metal powders. It operates in the following segments: Antimony Products, Atomized Metal Powder, and Others. The Antimony Products segment provides antimony compounds such as antimony trioxide used as a flame retardant aid added to synthetic resin products and as a polymerization catalyst for polyester. The Atomized Metal Powder segment deals with the manufacture and sale of fine powder for electronic parts of non-ferrous metals. It also offers coarse powder for bearings of precision motors. The Others segment includes real estate leasing business. The company was founded on June 11, 1935 and is headquartered in Tokyo, Japan.