- Amerada Hess (M) Limited
- Brunei Shell Petroleum Company Sdn Bhd
- Carigali-Triton Operating Company Sdn Bhd
- Carigali-PTTEPI Operating Company Sdn Bhd
- Esso Malaysia Berhad
- Exxonmobil E&P Malaysia Inc
- Exxonmobil Business Support Centre
- Genting Oil and Gas Limited
- Hall-Houston Malaysia Ltd
- IPC Malaysia Ltd
- Lundin Malaysia Limited
- Murphy Sarawak Oil Co. Ltd
- Newfield Peninsula Malaysia Inc
- Nippon Oil Exploration (M) Ltd
- Occidental Petroleum (M) Ltd
- OMV (VIETNAM) Exploration Gmbh
- Devon Energy Malaysia Ltd
- Overseas Petroleum and Investment Corporation
- Petroleum Nasional Berhad
- Petronas Carigali Overseas (UK) LTD
- Petronas Carigali Sdn Bhd
- PTT Exploration & Production Public Co Ltd
- Santa Fe Energy Resources (Thailand) Ltd
- Santa Fe Energy Resources of Malaysia Ltd
- Sarawak Shell Berhad
- Talisman Malaysia Limited
- Thai Shell Exploration and Production
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