| Eldrive | Sofia |
| Electron | Sofia |
| Electronics & Software | Sofia |
| Elevate Company | Sofia |
| Eleven Ventures | Sofia |
| Elexim | Sofia |
| Elido Media | Sofia |
| Elta-R Communications | Sofia |
| Eltrade | Sofia |
| EM-Design.net | Plovdiv |
| Empower Capital | Sofia |
| Encharge Ltd | Sofia |
| Enco Electronics Ltd | Sofia |
| Encrypted.bg | |
| EnduroSat | Sofia |
| Enhancv | Sofia |
| Enterprise SDS | Varna |
| Entrea Capital | Sofia |
| Entrepregirl | Sofia |
| Entrepreneur.bg | Sofia |
| EntrepreneursNightOut | |
| EntroSolutions | |
| ePay.BG | Sofia |
| ERG Capital-3 | Sofia |
| Escom Ltd | Sofia |
| Escreo | Sofia |
| ESD Bulgaria Ltd | Sofia |
| Estate Assistant | Sofia |
| Etel Ltd | Sofia |
| Eurocoders | Plovdiv |
| Eurodesign Systems Ltd | Sofia |
| Eurolan Networks | Sofia |
| European Polytechnical University Bulgaria | Pernik |
| European Software Institute | Sofia |
| EuroRisk Systems Ltd | Varna |
| Eveda Design | |
| Ever Co. Ltd | Sofia |
| Evermore Ltd | |
| Evo-Digital | |
| Evolink AD Sofia | Sofia |
| Evrotrust | |
| Expat Capital | Sofia |
| Experian | |
| Expert Allies | |
| ExpertSYS | Varna |
| Exsisto | Sofia |
| EZHostSol | Sofia |
| Fakturirane | Sofia |
| Fast.NET Ltd | Sofia |
| FastPCSupport.eu | Sofia |