JK Holdings Co., Ltd. engages in the management of its group of companies, which engage in the building materials business. It operates through the following segments: General Building Material Wholesale, Plywood Manufacturing and Wood Processing, General Building Material Retail, and Others. The General Building Material Wholesale deals with the wholesale of timber, lumber, plywood, housing equipment, fixtures, and building materials. The Plywood Manufacturing and Wood Processing segment manufactures and sells ordinary plywood, structural laminated veneer lumber, glued laminated timber, and wood panels. The General Building Material Retail segment handles the retail of plywood, secondary plywood products, building materials, and housing equipment. The Others segment includes franchise, real estate leasing, warehousing and transportation, construction, travel, and insurance agency businesses. The company was founded by Takeshi Yoshida in October 1937 and is headquartered in Tokyo, Japan.