Sankyo Tateyama (三協立山株式会社) is a company that develops, manufactures, and sells building, housing, and exterior construction materials for commercial and residential sectors. The company operates through three sectors: Building materials, Materials, and Commercial facilities. The Building materials segment is involved in the development, production, and distribution of housing and exterior building materials such as curtain walls, aluminum window systems, air ventilation systems, etc. The Materials segment offers the development, design, prototyping, mass production, and delivery of aluminum and magnesium billet and profile products. It also provides creation, design, production, construction, and maintenance services of commercial spaces through its Commercial facilities segment.