| OPU | No. of Staff |
| ASEAN Bintulu Fertilizer Sdn Bhd | 1 |
| KLCC Urusharta Sdn Bhd | 1 |
| Malaysian Refining Company Sdn Bhd | 8 |
| Malaysia LNG Sdn Bhd | 8 |
| PETRONAS Chemicals Ammonia Sdn Bhd | 1 |
| PETRONAS Chemicals Derivatives Sdn Bhd | 1 |
| PETRONAS Chemicals Ethylene Sdn Bhd | 2 |
| PETRONAS Chemicals Fertiliser Kedah Sdn Bhd | 2 |
| PETRONAS Chemicals Marketing (Labuan) Ltd | 2 |
| PETRONAS Chemicals Methanol Sdn Bhd | 2 |
| PETRONAS Chemicals MTBE Sdn Bhd | 6 |
| PETRONAS Chemicals Group Berhad | 2 |
| PETRONAS Refinery & Petrochemical Corporation Sdn Bhd | 15 |
| PETCO Trading Labuan Company Ltd | 4 |
| Petroliam Nasional Berhad | 95 |
| PETRONAS Carigali Sdn Bhd | 58 |
| PETRONAS Chemicals LDPE Sdn Bhd | 2 |
| PETRONAS Dagangan Berhad | 5 |
| PETRONAS Floating LNG (Satu) Ltd | 1 |
| PETRONAS Gas Berhad | 17 |
| PETRONAS ICT Sdn Bhd | 5 |
| PETRONAS LNG Ltd | 2 |
| PETRONAS Penapisan (Terengganu) Sdn Bhd | 10 |
| PETRONAS Technical Services Sdn Bhd | 6 |
| PETRONAS Technical Training Sdn Bhd | 1 |
| Petrosains Sdn Bhd | 1 |
| Universiti Teknologi PETRONAS | 331
|
