| Çalık Holding / Petronas, Turkmenistan |
British Petroleum, Azerbaijan |
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| Dresselhaus GmbH, Germany |
Bossard AG, Switzerland |
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| LTW Tiefbauvertriebs, Germany |
NPO LIT, Russian Federation |
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| Albema-Robema Netherlands |
Energiambiante, Italy |
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| Ishikawajima UK |
Foster Wheeler, Turkey |
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| Tüpraş Refinery, Turkey |
Petkim Petrochemical Plant |
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| Botaş Petroleum Pipeline Corp. |
Çimtaş |
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| Gama Power |
Zorlu Energy Group, Turkey |
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| Nurol Construction |
STFA Construction |
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| Güriş Construction |
Alsim Alarko Contracting Group |
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| Tekfen Construction |
Erdemir |
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| Isdemir |
Enka |
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| USKON |
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