| Amata B.Grimm Power Limited | Asset Management Company of Power Station asssets in Southeast Asia region | Infrastructure | Thailand |
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| ANS Steel Tubes Limited | Manufacturing and sales of electric resistance welded (ERW) pipes for automobiles and motorcycles | Metal Products | India |
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| Calamba Steel Center Inc. | Steel service center (processing and sales) | Metal Products | Philippines |
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| CS Metal Co., Ltd. | Steel service center (processing and sales) | Metal Products | Thailand |
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| Dragon Logistics Co., Ltd. | Warehousing & Distribution Services | Infrastructure | Vietnam |
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| Dunlop Tire (Thailand) Co., Ltd. | Import and wholesale of tires for Sumitomo Rubber Industries in Thailand | Transportation & Construction Systems | Thailand |
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| Emerald Grain Pty Ltd | Grain Trade & Marketing and Supply Chain Operation | Living Related & Real Estate | Australia |
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| First Philippine Industrial Park, Inc. | Development, Sales, and operation of industrial estate in Philippines | Infrastructure | Philippines |
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| FujiMart Vietnam Retail LLC. | Supermarket in Vietnam | Living Related & Real Estate | Vietnam |
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| HAL Vietnam Co., Ltd. | Manufacture and Sales of aluminum casting parts for automobiles | Transportation & Construction Systems | Vietnam |
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| Hanoi Steel Center Co., Ltd. | Steel service center (processing and sales) | Metal Products | Vietnam |
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| Health Connect Holdings Sdn. Bhd. | Provide Healthcare Management and Administration Service in Malaysia | Living Related & Real Estate | Malaysia |
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| India Steel Summit Private Limited | Shearing, slitting of steel plates and manufacture of metal stamping parts and die | Transportation & Construction Systems | India |
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| J.J. Impex (Delhi) Private Limited | Repair/after-sale service for automobiles in India | Transportation & Construction Systems | India |
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| Japan Sankofa Offshore Production Pte Ltd | FPSO Owning and Chartering Business for Oil and Gas Field, offshore Ghana | Mineral Resources, Energy, Chemical & Electronics | Singapore |
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| Juice Products New Zealand Ltd. | manufacturing of squeezed juice from vegetables & fruit , mainly from carrots | Living Related & Real Estate | New Zealand |
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| KDDI Summit Global Singapore Pte. Ltd. | Investment in KDDI Summit Global Myanmar Co., Ltd. | Media & Digital | Singapore |
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| KIRIU (THAILAND) Co., Ltd. | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | Thailand |
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| Krisumi Corporation Private Limited | Condominium development in the northern Indian city of Gurugram in Haryana State | Living Related & Real Estate | India |
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| Kubota Agricultural Machinery india Private Ltd. | Sale of tractors, combines, and rice transplanters in India | Transportation & Construction Systems | India |
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| Kuraray GC Advanced Materials Co., Ltd. | Manufacture Butadiene derivatives in Thailand | Mineral Resources, Energy, Chemical & Electronics | Thailand |
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| Mactan Steel Center Inc. | Steel service center (processing and sales) | Metal Products | Philippines |
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| Mahindra Industrial Park Chennai Limited | Development, sales, and operation of industrial estate in India | Infrastructure | India |
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| MUNJAL KIRIU Industries Pvt. Ltd. | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | India |
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| P.T. East Jakarta Industrial Park | Sales, operation, and maintenance of industrial estate in Indonesia | Infrastructure | Indonesia |
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| P.T. Oto Multiartha | Financing of automobiles | Transportation & Construction Systems | Indonesia |
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| P.T. Summitmas Property | Leasing of office buildings and warehouses | Living Related & Real Estate | Indonesia |
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| P.T. Summit Oto Finance | Financing of motorcycles | Transportation & Construction Systems | Indonesia |
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| Petro Summit Pte. Ltd. | International trade of crude oil and petroleum products | Mineral Resources, Energy, Chemical & Electronics | Singapore |
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| PM Care Sdn. Bhd. | Provide Healthcare Management and Administration Service in Malaysia | Living Related & Real Estate | Malaysia |
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| PT. KIRIU INDONESIA | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | Indonesia |
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| PT. Premium Garansi Indonesia | Guarantee service for automobiles | Transportation & Construction Systems | Indonesia |
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| PT. Super Steel Karawang | Steel service center (processing and sales) | Metal Products | Indonesia |
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| PT. Traktor Nusantara | Forklift hire/rental, and sale/service for forklift, farm tractor and industrial equipment in Indonesia | Transportation & Construction Systems | Indonesia |
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| PT. Weeo Solutions Frontier | Telematics & Smart Agriculture・IoT Service Provider in ASEAN country and India | Transportation & Construction Systems | Indonesia |
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| PT Monotaro Indonesia | E-commerce business with a focus on subsidiary materials for factories in Indonesia | Media & Digital | Indonesia |
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| PT Sumisho Global Logistics Indonesia | Warehousing & Distribution Services | Infrastructure | Indonesia |
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| PT Supreme Energy Muara Laboh | Muara Laboh Geothermal Power Plant Project in Indonesia | Infrastructure | Indonesia |
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| Saigon Steel Service & Processing Co., Ltd. | Steel service center (processing and sales) | Metal Products | Vietnam |
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| Sakura Ferroalloys Sdn. Bhd | Production and marketing of manganese alloy | Mineral Resources, Energy, Chemical & Electronics | Malaysia |
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| SC Metal Pty Ltd | Investment in aluminum smelting operation in Australia | Metal Products | Australia |
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| SC Mineral Resources Pty. Ltd. | Investment in the Northparkes copper mine in Australia | Mineral Resources, Energy, Chemical & Electronics | Australia |
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| SHOP Global (Thailand) Co., Ltd. | Developing a multimedia retail business with a focus on TV in Thailand | Media & Digital | Thailand |
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| SMAS Auto Leasing India Private Limited | Leasing of motor vehicles | Transportation & Construction Systems | India |
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| SSJ Consulting (Vietnam) LLC | Consultation services for port operation and logistics businesses in Vietnam | Infrastructure | Vietnam |
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| Steel Centre (M) Sdn. Bhd. | Steel service centre (processing and sales), production and sales of steel products of construction | Metal Products | Malaysia |
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| Sumiputeh Steel Centre Sdn. Bhd. | Steel service center (processing and sales) | Metal Products | Malaysia |
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| Sumisho Coal Australia Pty. Ltd. | Investment in coal mines in Australia | Mineral Resources, Energy, Chemical & Electronics | Australia |
|---|
| Sumisho Global Logistics (Thailand) Co., Ltd. | Warehousing & Distribution Services | Infrastructure | Thailand |
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| Sumisho Metal (Thailand) Co., Ltd. | Steel service center (processing and sales) | Metal Products | Thailand |
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| Sumisho Motor Finance Corporation | Financing of motorcycles | Transportation & Construction Systems | Philippines |
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| Sumitomo Mitsui Auto Leasing & Service (Thailand) Co., Ltd. | Leasing of motor vehicles | Transportation & Construction Systems | Thailand |
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| Sumitomo Rubber Australia Pty. Ltd. | Import and wholesale of tires for Sumitomo Rubber Industries in Australia | Transportation & Construction Systems | Australia |
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| Summit Auto Lease Australia Pty Limited | Leasing of motor vehicles | Transportation & Construction Systems | Australia |
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| Summit Capital Leasing | Financing of motorcycles | Transportation & Construction Systems | Thailand |
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| Summit Forests New Zealand Limited | Holding forest assets, Finance, Harvesting logs, Sales, Planting, Silviculture | Living Related & Real Estate | New Zealand |
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| Summit Rural (WA) Pty., Ltd. | Import, manufacture and sale of fertilizer in Western Australia | Mineral Resources, Energy, Chemical & Electronics | Australia |
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| Summit SPA Motors Ltd. | Technology and advisory services for Hino brand truck, bus and provision of spare parts | Transportation & Construction Systems | Myanmar |
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| Thai Special Wire | Manufacture and sales of PC steel wires and spring wires | Metal Products | Thailand |
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| Thai Steel Pipe Industry Co., Ltd. | Manufacture and sales of welded steel tubes | Metal Products | Thailand |
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| Thang Long Industrial Park (Vinh Phuc) Corporation | Development, sales, and operation of industrial estate in Vietnam | Infrastructure | Vietnam |
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| Thang Long Industrial Park Corporation | Development, sales, and operation of industrial estate in Vietnam | Infrastructure | Vietnam |
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| Thang Long Industrial Park II Corporation | Development, sales, and operation of industrial estate in Vietnam | Infrastructure | Vietnam |
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| Tiki Corporation | Online retailer of books and other goods | Media & Digital | Vietnam |
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| Toyota Can Tho Company Ltd. | Dealership of Toyota motor vehicles | Transportation & Construction Systems | Vietnam |
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| Toyota Giai Phong Company | Dealership of Toyota motor vehicles | Transportation & Construction Systems | Vietnam |
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| Union Harvest (M) Sdn.Bhd. | Import, manufacture and sale of fertilizer in Malaysia | Mineral Resources, Energy, Chemical & Electronics | Malaysia |
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| Vietnam Nippon Steel Pipe Company Limited | Manufacture and sales of mechanical steel tubes mainly for motorcycles | Metal Products | Vietnam |
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