| National Petrochemical Company(NPC) | ||
| National Iranian South Oil Company(NISOC) | ||
| Iranian Central Oil Fields Company (ICOFC) | ||
| Petrochemical Industry Development Management Company (PIDMCO) | ||
| Khatam‑al Anbiya Construction Headquarters | ||
| Ilam Petrochemical Company | ||
| Bushehr Petrochemical Company | ||
| Takht Jamshid Petrochemical Company | ||
| Amir Kabir Petrochemical Company | ||
| Poly nar Petrochemical Company | ||
| Eksir Halal Assalouye Company | ||
| Imam khomeini Oil Refinery Company(shazand) | ||
| Tabriz Oil Refinery Company | ||
| Parsian Gas Refinery Company | ||
| Ilam Gas Treating (Processing) Company | ||
| Karoun oil & Gas Company(KOGPC) | ||
| Iranian Offshore Oil Company(IOOC) | ||
| Pars Oil and Gas Company(POGC) | ||
| Ghods Niroo Engineering Company | ||
| ICII Company | ||
| Jondishapour Company | ||
| Hampa Engineering Company | ||
| Hedco Company | ||
| Namavaran Delvar Engineering and Construction(NDEC) | ||
| Mapna Group Company | ||
| Oil Turbo Compressor Construction Compant(OTCC) | ||
| Petro Part Company | ||
| Tasdid Company | ||
| Assalouye Green Tank Petrochemical Company(AGTP) | ||
| Iran Arvin Company | ||
| Iran Itok Company | ||
| Persia Oil & Gas Company | ||
| Asfalt Tous Company | ||
| Rahab Consulting Engineers Company | ||
| Anil P. Asak Company | ||
| Farashband Company | ||
| Arshin Industry Parmida Company | ||
| TNSehat Company | ||
| Milad Company | ||
| Sakhtar Farda Company |
