| Industrial Development and Renovation Organization of Iran (IDRO) | http://www.idro.org |
| National Iranian Gas Company (NIGC) | http://www.nigc.ir |
| Petropars Company | http://www.ppars.com |
| Toyo Engineering Corporation (TEC) | http://www.toyo-eng.co.jp |
| JGC Corporation (JGC) | http://www.jgc.co.jp |
| Daelim Industrial Company (DAELIM) | http://eng.daelim.co.kr |
| Payandan Company | http://www.payandan.com |
| AkerKvaerner Company | http://www.akerkvaerner.com |
| Azarab Industries Company | http://www.azarab.ir |
| Machine Sazi Arak Company (MSA) | http://www.msa.ir |
| National Iranian Oil Company (NIOC) | http://www.nioc.ir |
| Pars International Development and Engineering Company (PIDECO) | http://www.pideco.com |
| Sazeh Consultants Engineering and Construction (SAZEH) | http://www.sazeh.com |
| Petronegin Jonoob Company (PNJ) | http://www.ioic.ir |
| Pars Oil and Gas Company (POGC) | http://www.pogc.ir |