| - Alliance Refining (Shell/Caltex JV) |
- Asian Marine Services |
| - Bangchak Refinery |
- Bayer Polymers |
| - COCO Group |
- CTCI (Thailand) |
| - H.C.Starck |
- McConnell Dowell |
| - National Petrochemical (NPC) |
- Rayong Electricity Generating Co. (REGCO) |
| - Rayong Olefins (ROC) |
- Siam Cellulose |
| - Siam Guardian Glass |
- Siam Occidental |
| - Siam Strip Mill |
- Slot Nankai |
| - Thai Asahi Chemicals (THASCO) |
- Thai Oil Refinery |
| - Thai Petrochemical Industry (TPI) |
- Thai Plastic & Chemicals (TPC) |
| - Thai Polycarbonate / Polyacetal |
- Thai Safety Glass |
| - Tuntex Petrochemical |
- Unithai Shipyard |
| - Vinythai |
|
