| BenoliTech | |
| Bento | |
| Berg Software | |
| Best Hosting S.R.L. | Botoșani |
| Best Web Image S.R.L. | Bucharest |
| BestWeb.info | Bucharest |
| Beta-n Computers Serv | Bucharest |
| Betfair Romania Development | Cluj |
| BetterSoft | Cluj |
| BG Soft S.R.L. | |
| BI Consulting | |
| BigData Software | Cluj |
| BinarCode | |
| BiniSoft.org | |
| Binrace S.R.L. | Bucharest |
| BISS | Bucharest |
| BisSoft | |
| Bitcom IoT | |
| BiTech Company | |
| BITNET Centrul de Cercetari Senzori & Sisteme | Cluj |
| Bits&Coffee S.R.L. | Dolj |
| Bitsoft | |
| BITSoftware | |
| Bitspoke Soft S.R.L. | |
| Bittnet | |
| Bizarnet | Cluj |
| BizNet | Bucharest |
| BKHosting S.R.L. | Brașov |
| Black & White Media | Brașov |
| Black Bullet | |
| Black Label Software Technologies | |
| Black Sea Capital | |
| Black Sea ClimAccelerator | |
| Blackshell | |
| Blank Design S.R.L. | |
| BlockBitsIO | |
| Bloomcoding | |
| Blu Capital Partners | |
| Blue Project Software | Bucharest |
| Blue Soft S.R.L. | Timiș |
| Bluebay Design | |
| Bluetree | |
| BlueTweak | |
| Blugento S.A. | Cluj |
| BMF Digital | |
| BMG Solutions | |
| BoostIT | |
| Brainic | |
| Brainspotting | Bucharest |
| Brand Minds | |