| S.C.BUILDING SERVICE CO.,LTD. | General building maintenance (cleaning, equipment maintenance, security) | Diverse Urban Development |
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| S.C. CEMENT CO., LTD. | Sales of cement, ready-mixed concrete and concrete products | Diverse Urban Development |
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| SC-ABEAM AUTOMOTIVE CONSULTING | Consulting services specialized in the automotive industry | Automotive |
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| SC AUTOMOTIVE ENGINEERING CO., LTD. | Engineering solutions in automotive design and development (mainly consulting business) | Automotive |
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| SC DIGITAL CO., LTD. | DX support business focusing on marketing DX | Media & Digital |
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| SC FOODS CO.,LTD. | Developmental import and sale of foods, meat, beverages, grains, fats, sugars, etc. | Lifestyle |
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| SC HIROSHIMA ENERGY CORPORATION | Power and heat supply business for Micron Memory Japan, Inc.'s Hiroshima Plant (energy service business) | Diverse Urban Development |
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| SC MACHINERY AND SERVICE CO.,LTD. | Wholesale of automotive manufacturing equipment and related parts | Automotive |
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| SC RISK SOLUTIONS CO.,LTD. | Reinsurance broker | Diverse Urban Development |
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| SCSK CORPORATION | Software development, information processing service, communication network service, information platform solutions and services, sales of package software as well as software and hardware, SI service and others, and BPO | Media & Digital |
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| SCTM ENGINEERING CORPORATION | Engineering solutions in automotive design and development (mainly offshore development business) | Automotive |
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| SHARING DESIGN INC. | Provision of base station sharing services to Mobile Network Operators | Media & Digital |
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| SHINKO SUGAR MILL CO., LTD. | Manufacturing and sales of sugar and molasses | Lifestyle |
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| SMB KENZAI CO., LTD. | Sales of various building materials and construction work | Diverse Urban Development |
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| Social Interior Inc. | ・Planning, development, and operation of “Subscribe Life,” a furniture and appliance subscription service
・Providing “Social Interior Office Construction Support,” which supports the entire process of creating a corporate office
・Planning, development, and operation of “Social Interior Business Management Cloud,” a furniture and fixture ordering and receiving platform | Media & Digital |
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| SOLAR POWER KITAKYUSHU CORPORATION | Solar Power IPP | Energy Transformation |
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| SOLAR POWER MINAMISOMA HARAMACHI IN C. | Solar Power IPP | Energy Transformation |
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| SOLAR POWER MINAMISOMA KASHIMA INC. | Solar Power IPP | Energy Transformation |
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| SOLAR POWER SAIJYO CORPORATION | Solar Power IPP | Energy Transformation |
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| SOLAR POWER TOMAKOMAI CORPORATION | Solar Power IPP | Energy Transformation |
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| Soracle Corporation | Passenger transportation business using eVTOL (electric vertical takeoff and landing) aircraft | Transportation & Construction Systems |
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| SPRING INFRASTRUCTURE CAPITAL CO., LTD | Fund management of infrastructure funds | Energy Transformation |
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| SUMISHO AERO-SYSTEMS CORPORATION | Sale of aerospace equipment | Transportation & Construction Systems |
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| SUMISHO BUILDING MANAGEMENT CO., LTD | Office building operation and other | Diverse Urban Development |
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| SUMISHO GLOBAL LOGISTICS CO., LTD. | Global Logistics Service Provider | Diverse Urban Development |
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| SUMISHO INSURANCE CORPORATION | Insurance agency | Diverse Urban Development |
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| SUMISHO INTERIOR INTERNATIONAL INC. | Interior design, construction, planning, procurement and others | Diverse Urban Development |
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| SUMISHO MARINE CO., LTD. | Shipping related trading business (newbuilding/2nd hand/charter) | Transportation & Construction Systems |
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| SUMISHO MATERIALS CORPORATION | Phisical trading of precious metals, non-ferrous metals, rare metals, etc. | Mineral Resources |
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| SUMISHO MONTBLANC CO.,LTD. | Planning, manufacturing, and sales of fabrics and products for white coats, service and working uniforms | Lifestyle |
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| SUMISHO REALTY MANAGEMENT CO., LTD. | Investment management business, investment advisory and agency business, Type II financial instruments business, and building lots and buildings business | Diverse Urban Development |
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| SUMISHO RESIDENTIAL CO., LTD. | Sales, brokerage, and leasing of real estate | Diverse Urban Development |
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| SUMISHO TATEMONO CO., LTD. | Management of real estate | Diverse Urban Development |
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| SUMISHO URBAN DEVELOPMENT,CO.,LTD. | Planning, development, management, and operation of shopping centers | Diverse Urban Development |
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| SUMISHO VENTURE PARTNERS, INC. | CVC Portfolio Management, ICT related business development with Portfolio, ICT related investment, Fund investment | Media & Digital |
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| SUMITOMO CORPORATION GLOBAL METALS CO., LTD. | Trading of steel products and Investment on manufacturing and processing steel products | Steel |
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| SUMITOMO CORPORATION POWER AND MOBILITY CO., LTD. | Import and export of automobiles, railcars, electric power project facilities, and their components | Automotive |
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| SUMITOMO MITSUI AUTO SERVICE COMPANY, LIMITED | Leasing, rental, maintenance, repair, and inspection of automobiles and other mobility services | Automotive |
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| SUMITOMO MITSUI FINANCE AND LEASING COMPANY, LIMITED | Leasing | Transportation & Construction Systems |
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| SUMITOMO PRECISION PRODUCTS CO., LTD. | Manufacture and sale of aircraft components and heat exchangers, and ICT equipment | Transportation & Construction Systems |
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| SUMITOMO SHOJI CHEMICALS CO., LTD. | Sale and trade of plastics, organic chemicals, inorganic, and fine chemicals and electronic materials | Chemical Solutions |
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| SUMITOMO SHOJI MACHINEX CO., LTD. | Sale of machinery and equipment | Diverse Urban Development |
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| SUMITRONICS CORPORATION | Electronics Manufacturing Service | Chemical Solutions |
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| SUMMIT,INC | Supermarket chain | Lifestyle |
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| SUMMIT AGRI-BUSINESS CORPORATION | Manufacture and sale of fertilizers and agriculture-related materials | Chemical Solutions |
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| SUMMIT AGRO INTERNATIONAL LTD. | Development and distribution of crop protection products, household insecticides and pet care products | Chemical Solutions |
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| SUMMIT AIR SERVICE CORPORATION | Travel agency | Diverse Urban Development |
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| SUMMIT-BENICHU COIL CENTER CO., LTD | Steel service center(processing and sales) | Steel |
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| SUMMIT COSMETICS CORPORATION | Manufacturing, Import and Export Sales, and Research & Development for Cosmetic Product and its ingredient | Chemical Solutions |
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| SUMMIT CRM, LTD. | Domestic and international trade of carbon-related materials, fuels, products and refractories | Mineral Resources |
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| SUMMIT ENERGY CORPORATION | Planning, development and operation of domestic retailing of electric power, domestic business in electric power and energy field and controlling its 5 subsidiaries | Energy Transformation |
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| SUMMIT ENERGY DEVELOPMENT CO.,LTD | Advisory services for exploation, development and production of natural gas and other resources and the related business | Energy Transformation |
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| SUMMIT GLOBAL POWER LTD. | Development, asset management and technical support for power generation and desalination projects. (This company has a branch in Abu Dhabi, United Arab Emirates) | Energy Transformation |
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| SUMMIT HANDA POWER CORPORATION | Biomass-fired power generation | Energy Transformation |
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| SUMMIT MIHAMA POWER CORPORATION | Power and steam supply | Energy Transformation |
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| SUMMIT MYOJO POWER CORPORATION | Biomass-fired power generation | Energy Transformation |
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| SUMMIT OIL MILL CO., LTD. | Manufacture and sales of vegetable oil, and contract manufacturing, filling and packaging | Lifestyle |
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| SUMMIT PHARMACEUTICALS INTERNATIONAL CORPORATION | Drug discovery services, pharmaceutical development and supply of active pharmaceutical ingredients, intermediates and formulations | Chemical Solutions |
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| SUMMIT SAKATA POWER CORPORATION | Biomass-fired power generation | Energy Transformation |
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| SUMMIT STEEL CO.,LTD. | Steel service center(processing and sales) | Steel |
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| SUMMIT WIND POWER CORPORATION | Wind Power IPP | Energy Transformation |
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| SUN TRINITY LLC. | Business development and operation of solar power generation business in Japan | Energy Transformation |
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