| BOM Group Ltd | Bristol |
| BondAval | Greater London |
| Bondgate IT Services Ltd | County Durham |
| Bondline Electronics Ltd | Wiltshire |
| Bongo IT | |
| BONI Technology Ltd | |
| Bonnet Ltd | |
| Boodil Ltd | |
| BookingLive | |
| BookNow Software | |
| BooksoniX | Kent |
| Bookster | |
| Bookwhen Ltd | |
| Boom Online Marketing | |
| Boom Solutions Ltd | |
| BoomFi Ltd | |
| Boonwag Ltd | |
| Boords | |
| Boost Technology | |
| BoostOnline UK Group Ltd | |
| Bootcamp Media | |
| Booth Scotland | |
| Bordaline Web Design | Suffolk |
| Border Computer Systems | |
| Border Webworks Ltd | |
| Borealis Software Ltd | |
| Borer Data Systems Ltd | Berkshire |
| Boris Software Ltd | |
| Born | |
| Boss Digital | Buckinghamshire |
| Bot-Hive | |
| BotCore | |
| Bottlepay Ltd | |
| Boundary IT Services | West Sussex |
| Bourne Capital | |
| Bourne IT Services | |
| Bournemouth University | Dorset |
| Bournemouth University - National Centre for Computer Animation | Dorset |
| Bow House Digital Ltd | |
| Bowden Digitec | |
| Bowe Digital Ltd | Tyne and Wear |
| Bowers Semiconductors | Greater Manchester |
| Bowland IT | |
| Bowler Hat | West Midlands |
| Bowman | |
| Bowood Electronics Ltd | Derbyshire |
| Box Ltd | West Midlands |
| Box Network Solutions | |
| Box Technologies Ltd | Oxfordshire |
| Box UK | |