| Breckenridge | |
| Breed Media | South Yorkshire |
| Breeze (IT) Ltd | Nottinghamshire |
| Breeze Development | |
| Breeze Systems Ltd | Surrey |
| Breeze Technology Ltd | Cambridgeshire |
| BreezeTech | |
| Brendata UK Ltd | Essex |
| Brett Ward Ltd | Cambridgeshire |
| Brevity Marketing Ltd | |
| Brew Digital | |
| Brick Technology Ltd | |
| Bridge Partners Ltd | Cambridgeshire |
| Bridge Robotics Ltd | |
| BridgeHead Software Ltd | |
| BridgeU | |
| Bridgwater Electronics Ltd | |
| Briefly | |
| Briefly Bio Ltd | |
| BriefYourMarket.com | Derbyshire |
| Bright Analytics | |
| Bright Ascension Ltd | |
| Bright Creation Web Design London Ltd | |
| Bright Interactive Ltd | East Sussex |
| Bright Link Ventures Ltd | |
| Bright Network | |
| Bright New Media Ltd | Monmouthshire |
| Bright North | |
| Bright Spaces | |
| Bright Spark Programming | |
| Bright Spells Ltd | |
| Bright White Space | Cornwall |
| BrightBid | |
| Brightblue Consulting | |
| Brightbook Ltd | |
| Brightbox Systems Ltd | West Yorkshire |
| Brightbulb Design Ltd | |
| BrightCall | |
| BrightCherry Ltd | Hertfordshire |
| Brightec Ltd | |
| Brighter Consultancy Group Ltd | |
| Brighter Graphics Ltd | West Sussex |
| Brighter Media | |
| Brighterside Design Ltd | Wiltshire |
| BrightLocal Ltd | |
| BrightMinded Ltd | |
| Brightmobile.com | Glasgow |
| Brighton and Sussex Medical School | |
| Brighton Metropolitan College | |
| Brighton Website Design | |