Hiroshi Koyama

OK Corp. engages in the management of discount supermarkets. Its products include general grocery items, rice, pastries, beverages, liquor, daily necessities, consumable goods, pet supplies, household sundries, stationery, pharmaceuticals, fresh and processed meats, fish and seafood, fruits and vegetables, ornamental plants, side dishes, snacks, and cleaning products. It also operates bakeries and supplies consumer electronics, household tools, hardware, and sporting goods. The company was founded by Susumu Iida in June 1958 and is headquartered in Yokohama, Japan.