| Astea Solutions AD | |
| Asysta Ltd | Sofia |
| Atlant Security | |
| Atlantis BG Ltd | Sofia |
| ATM Electronics Ltd | Sofia |
| Atom Solutions | Sofia |
| AUG Global Technologies Ltd | |
| AVG Bulgaria | Sofia |
| Axis.bg | Plovdiv |
| AzonMedia | Sofia |
| BAAER | |
| BAIT | Sofia |
| Balkan Blockchain Association | Sofia |
| Balkan Internet Exchange | Sofia |
| Balkan Services | |
| Balkanhackathon.eu | Sofia |
| BankSoft | Plovdiv |
| BB Media Ltd | Sofia |
| BCS Bulgaria Ltd | Sofia |
| Bedigital Ltd | Sofia |
| Bekyarov | |
| Belayer | Sofia |
| Belvek | Sofia |
| Besco | Sofia |
| Beta Peak | Sofia |
| Betahaus BG | Sofia |
| BG Office | Sofia |
| BG Service Ltd | Sofia |
| BG Solutions | Sofia |
| BGOcloud | Sofia |
| BGOUG | Sofia |
| BGPages.com | Sofia |
| BGpro Media | Sofia |
| bgRuse.com | Ruse |
| BGWebHosting | Sofia |
| BGZone.com | Sofia |
| Bica | Sofia |
| Biizey | |
| Bilex-LP | Plovdiv |
| BimDesigned.com | |
| Biodit Global Technology | Sofia |
| Biomyc Ltd | |
| BioSeek JSC | Sofia |
| Bioteam Software Ltd | Sofia |
| BIX.BG | Sofia |
| BizLink Solutions | Sofia |
| Black Peak Technologies EAD | |
| BlackPeak Capital | Sofia |
| BLG Design | Blagoevgrad |
| Blisstool Ltd | Blagoevgrad |