| | Joint Venture - Amata Summit Ready Built Co., Ltd. (Ready Built Factory)
- Autopair Co.,Ltd (Automotive Aftermarket Trading Platform)
- Bangkok Eagle Wings Co., Ltd. (Stamping & Machining Parts)
- Complete Auto Parts Co., Ltd. (Assembly Plastic, Steel, Zinc, Brass and Machining Part)
- Complete Auto Rubber Manufacturing Co., Ltd. (Rubber Parts)
- Central Motor Wheel (Thailand) Co., Ltd. (Steel Wheels)
- Hiruta & Summit Co., Ltd. (Stamping Parts)
- Hitachi Astemo Chonburi Auto Parts Co.,Ltd. (Power Steering)
- Hitachi Astemo Chonburi Manufacturing Co.,Ltd. (Shock Absorber)
- Hyundai Glovis Logistics (Thailand) Co.,Ltd. (Logistics)
- PT. Summit Adyawinsa (Indonesia) (Press Part)
- PT. Sejong Summit Indonesia (Exhaust hot-end)
- Sankei Summit (Thailand) Co., Ltd. (Exhaust System, Door Sash)
- Steel Alliance Service Center Co., Ltd. (Steel Material, Coil Center)
- Summit Ansei Auto Parts Co., Ltd. (Door & Hood Latches)
- Summit Chugoku Seira Co., Ltd. (Automotive Nuts & Bolts)
- Summit IOSolution (Thailand) Co.,Ltd. (Optical Communication Lenses)
- Summit Keylex (Thailand) Co., Ltd. (Assembly Parts)
- Summit Kurata Manufacturing Co., Ltd. (Machining Parts)
- Summit Lenso Co., Ltd. (Aircraft Parts)
- Summit Nich Co., Ltd. (Roadbike)
- Summit Otsuka Manufacturing Co., Ltd. (Parking Brake)
- Summit Steering Wheel Co., Ltd. (Steering Wheels and Knob Gears)
- Thai Progress Rubber Co., Ltd. (Rubber Parts)
- Thai Steel Cable Public Company Limited (Control Cables and Window Regulator)
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