Banks and financial institutions:
- DSK Bulgarian Stock Exchange
- FESTA Holding AD
- Corporate Commercial Bank
- Investbank AD
- Unicredit Bulbank AD
- UBB Postbank AD
- Municipal Bank AD
- Central Depository
State administration and organizations:
- Varna Seaport EAD
- Bulgarian Posts EAD
- Steamship Industry BMF
- National Revenue Agency – Varna
- Bulgargaz EAD
- Information Services AD
- National Communications Commission
- Ministry of Justice
- Air Traffic Control – Sofia
- Ministry of Internal Affairs
- Ministry of Defense
- Municipality of Varna
- Ministry of Transport
- Ministry of Finance
- Water Supply and Sewerage – Varna EOO
- DNEK AD
- Municipality of Sofia
- Municipality of Shabla
Internet and telecommunication providers:
- Mobiltel AD
- Vivacom AD
- Spectrum Net
- Cosmo Bulgaria MobileNet BG
- Internet Group
- Net Is Sat
- Orbitel AD
Business users:
- Business Park Varna ADE
- ON Bulgaria AD
- Fraport Twin Star AD
- Albena AD
- Zlatni Pyasatsi AD
- Price Waterhouse Coopers
- Rusalka Holidays AD
- Petrol Holding AD
- Kaliakra AD
- Intracom AD
- Victoria Group AD
Production industry:
- Agropolychim AD
- Vidima Ideal AD
- Maritsa East Thermal Power Station
- Kremikovtsi AD
- Neftochim AD
- Solvey – Sodi AD