1Abadan Refinery49Navid Zar Shimi Co.
2Abhar Silis Co.50Mohanedsin Moshavere Sazeh Co.
3Aeen Talash Tabriz Co.51National Iranian Drilling Co.
4Arak Gas Co.52NIOGC (Centre and West)
5Aras Bonyad Co.53NIOGC (Esfahan)
6Ardabil Gas Co.54NIOGC (East South)
7Arya Shakhtar Co.55NIOGC (Fars)
8Baliyaye Shomal Co.56NIOGC (North and East North)
9Bandar Abbas Refinery(BAORCO)57NIOGC (North and West North)
10Emco Solutions Trading FZC (UAE)58Niroo Gostar Sanat Shargh Co.
11Chahar Mahal & Bakhtiyari Gas Co.59NIORDC
12Entghale Gas Zone 260Omran Maroon Co.
13Chehab Brothers Co. (IRAQ)61Palayesh va Pakhsh Co.
14Entghale Gas Zone 562Pars Energy Iran Kish Co.
15Chumsin Import and Export CO., LTD (THAILAND)63Pars Khodro Co.
16Esat Azerbaijan Gas Co.64Parto Khazan Co.
17Esfahan Gas Co.65Payandan Co.
18Fars Gas Co.66Petrochemical Industries Erection and Construction Co.
19Gas Resani Fars Province67Petro Pars Co.
20Gas Resani Khorasan Province68Qazvin Gas Co.
21Gilan Gas Co.69Radira Co.
22Gilan Sement Industries Co.70Rampco
23Gole Gohar Co.71Republic Islamic of Iran Army
24Golestan Gas Co.72Saber Yad Co.
25Gom Gas Co.73Sabir Co.
26Hamedan Gas Co.74Sadra Co.
27Hamgam Gostar Semnan Co.75Sana Co.
28IOPTC Co.76Sarkhoon Gas Refinery
29Iran Pol Co.77Saze Khavar C.
30Iranol Co.78Sazeh Co.
31Isfahan Refinery79Sazman Tose va Nosazi Maaden Iran
32Jahad Nasr Misagh Co.80Semnan Gas Co.
33Khozestan Rural Water and Waste Water Co.81Siman Lamerd Co.
34Kandovan Co.82SPGC Co.
35Kangan Gas Refinery83Tarh va Bazresi Co.
36Kerman Gas co.84Technosoudure Co.(ALGERIA)
37Kermanshah Gas Co.85Tehran Gas Co.
38Kermanshah Refinery86Tehran Jonoub Co.
39Keyvan Koosha Co.87Tehran Province Gas Co.
40Khorasan Gas Co.88Tehran Refinery
41Khozestan Gas Co.89Tehran Water and Waste Water
42Khozestan Water and Waste Water Co.90Tehran Zone Gas Co.
43Kohgeloye va Boyer Ahmad Gas Co.91Virak Co.
44Kurdistan Gas Co.92West Azerbaijan Gas Co.
45Lorestan Gas Co.93Yazd Gas Co.
46Mazandaran Gas Co.94Zanjan Gas Co.
47Mehr Afrooz Peyman Co.95Zarrin Dasht Co.
48Mesbah Energy Co.  And many others