| Brunei |
Brunei National Petroleum Co.  |
| Cambodia |
Cambodian National Petroleum Authority (CNPA) |
| China |
China National Petroleum Corp. (CNPC) |
| China Petroleum & Chemical Corp. (SINOPEC) |
| Indonesia |
PT. PERTAMINA |
| R & D Center for Oil & Gas Technology (LEMIGAS) |
| Directorate General of Oil and Gas (MIGAS) |
| Malaysia |
Petroliam Nasional Berhad (PETRONAS) |
| Myanmar |
Ministry of Energy |
| Pakistan |
National Refinery Ltd. (NRL) |
| Attock Refinery Ltd. (ARL) |
| Pakistan Petroleum Ltd. (PPL) |
| Philippines |
Petron Corp. |
| Singapore |
Singapore Petroleum Co., Ltd. (SPC) |
| Thailand |
PTT Public Co., Ltd. |
| The Bangchak Petroleum Public Co., Ltd. |
| Vietnam |
PETROVIETNAM |
| PETROLIMEX |
| Timor-Leste |
Autoridade Nacional do Petroleo (ANP) |
