| BuildEmpire Ltd | |
| BuildingBrands.Agency | |
| Built AI | |
| Built By Buffalo | |
| Built By Damon | |
| Built By Us | |
| Builtvisible | |
| Bulb Studios Ltd | |
| Bulbshare | |
| Bulgin Ltd | |
| Bull Marketing Ltd | Berkshire |
| Bulldog Digital Media Ltd | |
| Bulldog Interactive | Leicestershire |
| Bulletpoint Marketing | Greater Manchester |
| Bulletproof Cyber Ltd | Hertfordshire |
| Bumbl Creative Ltd | |
| BumbleBee IT Solutions Ltd | |
| Bump Studios | Merseyside |
| Bureau Veritas UK | |
| Burn Media Ltd | |
| Burnett & Reid, LLP | |
| Burningred | |
| Burns Statistics Ltd | |
| Burnthebook | Derbyshire |
| Burrotech | |
| Burton Dean Web Design | |
| Burton SEO | Staffordshire |
| Bus Solutions | Greater Manchester |
| Business & Tourism Solutions | |
| Business Advice Service Ltd | |
| Business Application Software Developers Association | Buckinghamshire |
| Business Careware Ltd | South Yorkshire |
| Business Communications | Greater London |
| Business Comuter Resources Ltd | East Sussex |
| Business Continuity Services Ltd | South Ayrshire |
| Business Ecosystem Engineering | |
| Business Green | |
| Business Integration Software Ltd | |
| Business IT Plus Ltd | West Sussex |
| Business Maps Ltd | Oxfordshire |
| Business Micro Systems (NI) | Ards and North Down |
| Business Micro Systems Ltd | |
| Business Net Solutions Ltd | Buckinghamshire |
| Business of Apps | |
| Business of Software | Cambridgeshire |
| Business Plan Writers UK Ltd | |
| Business Systems (UK) Ltd | Falkirk |
| Business Technology Support Ltd | |
| Business Web | Greater London |
| Business Webpage Ltd | Norfolk |