Karoun Drilling and Field Services
- Integrated Oilfield Services in Iran Offices in Tehran-Ahvaz-Agha Jari-BIK .
- http://mz3.com

RAMPCO
- Offers rehabilitation and maintenance services for petrochemical industries. Features a profile, and details on the services, and group of companies.
- http://www.rampco-ir.com/

Gostaresh Shirsazi
- Cast steel valve manufacturer for the petrochemical, gas, pertoleum refining and production and power generation industries.
- http://www.gssvalve.com/

National Iranian Petrochemical Company
- Petrochemical branch of the Iranian oil ministry.
- http://www.nipc.net

Iranian Offshore Engineering and Construction Co.
- Established in 1993, active in oil and gas projects.
- http://www.ioec.com/

TehranBerkeley Group of Companies
- A multi discipline, multi objective engineering and investment company witch mostly interests in Oil and Gas Projects.
- http://www.tehranberkeley.com