1. NIGC (The National Iranian Gas Company)
2. NIOEC (National Iranian Oil Engineering & Construction Company)
3. POGC (Pars Oil and Gas Company)
4. Kala Naft (Manufacturing Support and Procurement of Kala Naft Tehran)
5. IOOC (Iranian Offshore Oil Company)
6. IOEC (Iranian Offshore Engineering and Construction Company)
7. PIDMCO (Petrochemical Industries Development Management Co.)
8. MAPNA Group