J SPORTS Corporation | Supplier of sports programming |
| JUPITER ENTERTAINMENT Co., Ltd. | Operation of movie programming "Movie Plus", women's entertainment programming "LaLa TV" and VOD service "J:COM on Demand" |
| Jupiter Golf Network Co., Ltd. | Supplier of golf programming |
Jupiter Shop Channel Co., Ltd. | Operation of TV Shopping Channel |
Jupiter Telecommunications Co., Ltd. | Cable TV multiple system operation and multi channel broadcasting (link to J:COM group systems) |
| JUPITER VISUAL COMMUNICATIONS CO., LTD. | Production and supplier of "Act On TV" and "Act On BB" |
KI Fresh Access, Inc. | Large area middle trader business of fresh vegetables and fruits and Service center business |
KIRIU Corporation | Automotive components manufacturer (Disc rotor, Brake drum, etc.) |
| KS Summit Steel Co., Ltd. | Shearing, slitting, and sale of steel sheets |
| LNG Japan Corporation | Trading of LNG, investment and financing related to LNG business |
| LS Design Investments Co., Ltd. | Co-GP firm of "WILL business development consortium (Fund)" |
| S.C. BUILDING SERVICE CO., LTD. | Facility management of buildings in Tokyo Metropolitan Area |
S.C. Cement Co., Ltd. | Sale of cement, ready-mixed concrete and concrete products |
| SC Automotive Investment | Automotive Related Investment Fund Operation and Management |
| SC Bio Capital Co., Ltd. | Biotechnology venture Investment fund |
SC Foods Co., Ltd. | Import, marketing of meats and foods |
| SC Machinary & Service Co., Ltd. | Sales of various kinds of machines and equipment |
SC NETSUPER CORP.(SUMMIT NETSUPER CORP.) | Online grocery shopping service |
SC Pipe Solutions Co., Ltd. | Sale of steel piping and other steel products |
| SC Tubulars Co., Ltd. | Sale of specialty tubular products |
SC-ABeam Automotive Consulting | Automotive industry focused consulting |
SCSK Corporation | System integration, IT infrastructure implementation, IT management,BPO, IT hardware & software sales (Sumisho Computer Systems and CSK merged and changed the company name to SCSK on October 1, 2011) |
| Seven Industries Co., Ltd. | Manufacture and sale of laminated lumber and wood products |
| Soda Ash Japan Co., Ltd | Sales of soda ash from the United States |
| Sofuku Koki Co., Ltd. | Manufacture and sale of steel rack |
| SOUKAI DRUG Co., Ltd. | Internet drugstore |
| Sumifru Corporation | Import and sale of fruits and vegetables |
| Sumisho & Mitsuibussan Kenzai Co., Ltd. | Sale of building materials |
| Sumisho Administration Services Co., Ltd. | Personnel and general affairs services |
| Sumisho Aero-Systems Corporation | Sale of aerospace equipment |
| Sumisho Airbag Systems Co., Ltd. | Manufacture and sale of cushion for side curtain airbag |
Sumisho Brand Management Corporation | Import, designing and sales of the German luxury line of Chenille fabrics brand "FEILER″and women's apparel and accessories brand, "NARA CAMICIE" |
| SUMISHO BUILDING MANAGEMENT CO., LTD. | Property management of office buildings |
SUMISHO DRUG STORES INC. | Drugstore chain |
| Sumisho Global Logistics Co., Ltd.(SGL) | Global Logistics Service Provider |
| Sumisho Inax Corporation | Sale of industrial washing machines |
Sumisho Interior International Inc. | Space and interior designing and installation, import, export and sale of consumer goods, such as furniture and carpet for residential and contract use |
Sumisho Machinery Trade Corporation | Trading of machinery, equipment and automobiles |
| Sumisho Marine Co., Ltd. | Daily Administration of ship finance, operation/chartering of owned vessels, and marine equipment business |
| Sumisho Material Chugoku Co., Ltd. | Sale of civil engineering and construction steel materials, pottery industry materials, and manufactured goods |
| Sumisho Materials Corporation | Trading of precious metals and other products |
Sumisho Metalex Corporation | Sale of nonferrous metal products, materials for home heat solution |
| Sumisho Montblanc Co., Ltd. | Processing and sale of work uniforms and related clothing products |
Sumisho Realty Management Co., Ltd. | Asset management business of real estate |
| Sumisho Speciality Steel Corporation | Stock, sale, and processing of specialty steel |
| SUMISHO TATEMONO CO., LTD | Sale and management of residential properties; housing remodeling |
| Sumisho Tekko Hanbai Co., Ltd. | Sale of steel products |
| Sumisho Urban Kaihatsu, Co., Ltd. | Planning, development, management, and operation of shopping centers |
Sumitex International Company Limited | Production and sale of textile products and materials |
| Sumitomo Mitsui Auto Service Company , Limited | Leasing of motor vehicles |
Sumitomo Mitsui Finance and Leasing Co., Ltd. | Leasing |
Sumitomo Shoji Chemicals Co., Ltd. | Sale and trade of chemicals and plastics |
| Sumitomo Shoji Financial Management Co., Ltd. | Financial services such as cash management, trade settlement, and accounting services to Sumitomo Corporation and its subsidiaries |
| Sumitomo Shoji Machinex Co., Ltd. | Sale of machinery and equipment |
| Sumitomo Shoji Research Institute, Inc. | Research and consulting for Sumitomo Corporation Group companies |
Sumitronics Corp. | Electronics Manufacturing Service |
| Summit Agri-Business Corporation | Manufacture and sale of fertilizers and agriculture-related materials |
Summit Agro International, Ltd. | Development and sales of crop protection products, household insecticides and pet care products |
| Summit Air Service Corporation | Travel agency |
SUMMIT COLMO, INC. | General merchandise store chain |
Summit CRM, Ltd. | Trading of carbon-related materials(coke, etc), refractories and ferrous raw materials |
| Summit Energy Corporation | "Planning, development and operation of domestic retailing of electric power, domestic business in electric power and energy field and controlling its 4 subsidiaries."- Summit Mihama Power Corporation
- Summit Wind Power Corporation
- Summit Onahama S Power Corporation
- Summit Myojo Power Corporation
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| Summit Oil Mill Co., Ltd. | Manufacture and sale of vegetable oil and oil meal |
Summit Pharmaceuticals International Corporation | Drug discovery services, pharmaceutical development and supply of active pharmaceutical ingredients, intermediates and formulations |
| Summit Power Holdings Co., Ltd. | Management of overseas power generation |
| Summit Showa Aluminum Ltd. | Production of aluminum alloy ingots |
| Summit Steel Co., Ltd. | Shearing, slitting, and sale of steel sheets |
| Summit Steel Corporation | Sale of steel sheet and speciality steel |
SUMMIT, INC. | Supermarket chain |