- The Ministry of Infrastructure and Transport
- The Ministry of Environment and Energy
- The Ministry of Development and Investments
- The Ministry of Agricultural Development and Food
- The Ministry of Transport, Communications and Works (Cyprus)
- Public Enterprise for State Roads (North Macedonia)
- Public Enterprise Railways Infrastructure (North Macedonia)
- The Ministry of Finance (North Macedonia)
- The Organization for the Development of Crete S.A. (O.A.K. S.A.)
- Prefecture of Eastern Macedonia & Thrace
- Prefecture of Central Macedonia
- Prefecture of Epirus
- KEFALONIA & ITHACA DEVELOPMENT SA
- SAR Saudi Railway (Saudi Arabia)
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- EGNATIA ODOS SA
- The Hellenic Railways Organization SA
- OSE SA (Hellenic Railways Organization SA)
- ERGOSE SA (Subsidiary of the Hellenic Railways Organization SA)
- ATTIKO METRO SA
- TRAM SA
- NEA ODOS SA
- DRAGADOS SA
- FERROVIAL AGROMAN SA
- AKTOR S.A
- TERNA SA
- THESSALONIKI DEVELOPMENT SA
- Hill International N.V.
- AECOM Ltd