| Name | Region |
|---|---|
| Better.co.uk | |
| BetterBox | Buckinghamshire |
| BetterProposals.io | |
| BetterWebSpace | Leicestershire |
| Bexley Internet Solutions Ltd | Kent |
| Beyond Clicks | |
| Beyond Ideas | Hampshire |
| Beyond Infinity Games | |
| Beyond Labs Ltd | |
| Beyond Metrix Ltd | Bristol |
| Beyond the Web | Hampshire |
| Beyonder | Greater London |
| BeyondMath Ltd | |
| BeyondNorth | |
| BeZero Carbon | |
| BGF | |
| BGN Agency Ltd | |
| BGTS | |
| BHP Information Technology Ltd | South Yorkshire |
| BI Solutions | Berkshire |
| Bibase Software | South Yorkshire |
| Bibby Financial Services Ltd | |
| BibliU Ltd | |
| Bick Green Associates | |
| Bicolor Ltd | |
| Bicom Systems | |
| Bicycle Therapeutics | |
| BidBits | |
| Bidmark Ltd | West Yorkshire |
| Bidnamic | |
| Bidstack Ltd | |
| Big Bite Creative Ltd | |
| Big Cat Agency | |
| BIG Chief Studios Ltd | |
| Big Cloud | |
| Big Crayon | |
| Big Data Scoring | |
| Big Decision Ltd | South Lanarkshire |
| Big Eye Deers Ltd | |
| Big Fan | |
| Big Fish Internet Ltd | Greater Manchester |
| Big Games Machine | |
| Big Gun Digital Ltd | |
| Big Leap | |
| Big Partnership | |
| Big Picture | |
| Big Pond Digital Ltd | |
| Big Red Digital | |
| Big Rocket Marketing Ltd | |
| Big S Design | Glasgow |