National Iranian Gas Company (NIGC)
Hasheminejad Gas Company (SGPC)
South Pars Gas Company (SPGC)
Karun Oil and Gas Exploitation Company
Maroon Oil and Gas Exploitation Company
Gachsaran Oil and Gas Exploitation Company
Aghajari Oil and Gas Exploitation Company
Bidboland Gas Refining Company
Pars Oil and Gas Company
Parsian Gas Refinery