- National Iranian Gas Company—NIGC
- National Iranian Gas Transmission Company—IGTC
- Fajr Jam Gas Refinery (the largest gas refinery in Asia & the 2nd largest in the world)
- Natioanl Iranian Oil Pipeline & Telecommunication Company—IOPTC
- National Iranian Offshore Oil Company—NIOOC
- National Iranian Oil Company—NIOC
- Parsian Gas Refinery (2nd largest refinery in Iran & 6th in the world)
- South Pars Gas Company—SPGC
- National Iranian South Oil Company—NISOC
- Nardis Company
- Iranian Offshore Oil Company—IOOC
