- AAPICO Forging Public Co., Ltd.
- AGC Techno Glass (Thailand) Co., Ltd.
- Air Liquid (Thailand) Ltd.
- AJ Plast Public Co., Ltd.
- Asahi Tec Aluminium (Thailand) Co., Ltd.
- BASF (Thailand) Ltd.
- Bridgestone Tire Manufacturing (Thailand) Co., Ltd.
- Calsonic Kansei (Thailand) Co., Ltd.
- Carebos (Thailand) Ltd.
- Cobra International Co., Ltd.
- Colgate-Palmolive (Thailand) Ltd.
- Daiki Aluminium Industry (Thailand) Co., Ltd.
- Daikin Industries (Thailand) Ltd.
- Denso (Thailand) Co., Ltd.
- E&H Precision (Thailand) Co., Ltd.
- EXEDY (Thailand) Co., Ltd.
- EXEDY Friction Material Co., Ltd.
- Greiner Bio-One (Thailand) Ltd.
- Hayashi Telempu (Thailand) Co., Ltd.
- Hitachi Automotive System Chonburi Ltd.
- IHI Turbo (Thailand) Co., Ltd.
- Jotun Thailand Ltd.
- KYB (Thailand) Co., Ltd.
- KYB Steering (Thailand) Co., Ltd.
- Mead Johnson Nutrition (Thailand) Ltd.
- Michelin Siam Co., Ltd.
- Mitsubishi Elevator Asia Co., Ltd.
- Mitsubishi Electric Consumer Products (Thailand) Co., Ltd.
- Mitsubishi Motors (Thailand) Co., Ltd.
- Molnlycke Health Care (Thailand) Ltd.
- Nidec Shibaura Electronices (Thailand) Co., Ltd.
- Nikkei Siam Aluminium Ltd.
- Nordson Xaloy Asia (Thailand) Ltd.
- NSK Bearings Manufacturing (Thailand) Co., Ltd.
- Ogawa Asia Co., Ltd.
- Oishi Trading Co., Ltd.
- Pigeon Industries (Thailand) Co., Ltd.
- Rikken (Thailand) Co., Ltd.
- Saga Fastener (Thailand) Co., Ltd.
- SEI Interconnect Product (Thailand) Ltd.
- Serm Suk Beverage Co., Ltd.
- Serm Suk PCL.
- Siam Riken Industrial Co., Ltd.
- Siam Sanpo Co., Ltd.
- Siam AT Industry Co., Ltd.
- Siam Toyota Manufacturing Co., Ltd.
- Sony Technology (Thailand) Co., Ltd.
- Srithai Superware PCL.
- Sumitomo Rubber (Thailand) Co., Ltd.
- Sumitomo Electric Sintered Components (Thailand) Co., Ltd.
- Tatung (Thailand) Co., Ltd.
- Tayca (Thailand) Co., Ltd.
- TBKK (Thailand) Co., Ltd.
- TechnoPLAS Industry (Thailand) Co., Ltd.
- Thai Daizo Aerosol Co., Ltd.
- Thai Kikuwa Industries Co., Ltd.
- Thai Matto NS Co., Ltd.
- Thai Nippon Seiki Co., Ltd.
- Thai NOK Co., Ltd.
- Thai Summit PKK Bangpakong Co., Ltd.
- Thai Tohken Thermo Co., Ltd.
- Toacs (Thailand) Co., Ltd.
- Toyoda Gosei (Thailand) Co., Ltd.
- Triumph Motorcycles (Thailand) Ltd.
- TRW Fuji Serina Co., Ltd.
- Tsubakimoto Automotive (Thailand) Co., Ltd.
- Valeo Niles (Thailand) Co., Ltd.
- Vandapac Co., Ltd.
- Yamaha Motor Parts Manufacturing (Thailand) Co., Ltd.