The Bangchak Petroleum Public Co.,Ltd.     PTT. Public Co.,Ltd.

 
Esso (Thailand) Public Co.,Ltd.     PTTEP-Siam Limited

 
Chevron (Thailand) Limited.     The Shell Company of Thailand Limited.

Conoco (Thailand) Limited.     Siam United Service Co.,Ltd.

 
 IRPC (Public) Co.,Ltd.     Thai Rotary Engineering Limited

Map Ta Phut Tank Terminal Co.,Ltd.     Thai Tank Terminal Co.,Ltd.

PSP.specialites Co.,Ltd.     Toll (Thailand) Co.,Ltd.