| PT. Pupuk Sriwijaya |
| PT. Bukit Asam |
| PT. Pupuk Kalimantan Timur |
| PT. Enersol Daya Optima |
| PT. Rekayasa Industri |
| PT. Elnusa Petro Teknik |
| PT Kaltim Pasifik Amoniak |
| Gulf Resources Ltd. |
| PT Pertamina UP II Dumai |
| PT Kaltim Parna Industri |
| VICO Indonesia |
| Conoco Phillips Indonesia |
| PT Singgar Mulia |
| Mitsubishi Heavy Industries Ltd. |
| Syngenta Agroproducts Ltd. |
| PT DSM Kaltim Melamine |
| Hyundai Eng. & Const. Ltd. |
| PT. Wilmar Bio Energi |
| KJP |
| PT. Kaltim Daya Mandiri |
| PT. Zeneca Agri Product Indonesia |
| PT. Magma Nusantara Limited |
| JO YIN & Cemara Semitama |
| PT. Magma Nusantara Limited |
| PEC-Tech Indonesia |
| PT. Shinhwa Engineering & Contruction |
| PT. Kaltim Methanol Industri |
| PT. Kaltim Parna Industri |
| PT Petrokimia Gresik |
| PT Caltex Pacific Indonesia |
| PT Karya Putra Powerin |
| Pindo Deli – PT IKPP |
| PT Titis Sampurna |
| JGC Corporation – PT KBR Indonesia Joint Oparation |
| PT. Pertamina |
| PT Perusahaan Gas Negara |
