| Bulgarian Center for Women in Technology | Sofia |
| Bulgarian Centre of Women in Technology | Sofia |
| Bulgarian Design Group | Sofia |
| Bulgarian Development Bank | Sofia |
| Bulgarian Fintech Association | Sofia |
| Bulgarian Java User Group | Sofia |
| Bulgarian Private Equity and Venture Capital Association | Sofia |
| Bulgarian System Integration | Sofia |
| Bulgartel | Sofia |
| Bulhostpro.net | Sofia |
| Bullpros Consulting | Sofia |
| Bulmag EAD | Sofia |
| Bulpros Consulting JSC | Sofia |
| Bulsatcom | Sofia |
| Bulsis | Sofia |
| BulSite Net | Sofia |
| BulVentures | Sofia |
| Burgas Free University | Burgas |
| Burgas IT | Sofia |
| Business Park Sofia | Sofia |
| Business Park Sofia | |
| Businessmap | Sofia |
| Calipers | Sofia |
| Campus X | |
| Carista | Sofia |
| CashCredit | Sofia |
| Cayetano Gaming | Sofia |
| CCG Profiles | Sofia |
| Centillion Ltd | Sofia |
| Centio #Cybersecurity | Sofia |
| Centio Shop | Sofia |
| CEO Angels Club | Sofia |
| Changex | Sofia |
| Chaos Software | Sofia |
| Chase A Cloud | Sofia |
| Childish.eu | Sofia |
| CIS Ltd | Sofia |
| CleanTech Bulgaria | Sofia |
| Clearware | Sofia |
| Clientric Академия за Иновации в туризма | Sofia |
| Cloud Solutions | Sofia |
| Cloudcart | Sofia |
| CloudHostSpace Ltd | Sofia |
| ClouDNS | Sofia |
| CloudSource | Sofia |
| Cloxy Ltd | Sofia |
| Cluster Sofia Knowledge City | Sofia |
| CM2W | Sofia |
| CNSys plc | Sofia |
| Code Monsters | Sofia |