| American Embassy Sofia |
| Bulgarian Customs Agency |
| Bulgarian Industrial Association |
| Bulgarian National Bank |
| BULGARGAZ |
| Delegation of the European Commission to Bulgaria |
| Deutsche Telekom |
| EDIBUL |
| Ernst & Young |
| Inter Data Systems |
| HIMCO-Vratza (Chemical works) |
| Humbold University |
| Kozloduy Nuclear Power Plant |
| Metro - Sofia |
| Ministry of Defence |
| Ministry of Energy and Energy Resources |
| Ministry of Environment and Waters, PMU |
| Ministry of Finances |
| Ministry of Regional Development and Construction |
| Ministry of Economy |
| Ministry of Transport and Telecommunications |
| National Electrical Company |
| National Institute of Statistics |
| NOKIA Bulgaria |
| Patent Office of the Republic of Bulgaria |
| PLAMA-Pleven (Oil extraction works) |
| Risk Engineering |
| Sofia Airport |
| TBI Credit |
| Telcom Engineering |
| Trade Point Sofia |
| T-Systems International |
| Union Fenosa |
| UniCredit Consumer Financing |
| University of Limerick |
| University of Magdeburg |
| University of Plovdiv |
| US Customs Service |
