| Binary Reality | Greater Manchester |
| Binary Systems | |
| Binary Technologies Ltd | Glasgow |
| Binary-Studio | |
| BinaryWebs | |
| Bindoff Media | West Yorkshire |
| Bio-AMD | |
| Bio-Diagnostics Ltd | |
| BioAscent | |
| BioCaptiva Ltd | |
| Biochromex | |
| Biocomposites | |
| Biodexa Pharmaceuticals plc | |
| Biofortuna Ltd | |
| Bioinduction Ltd | |
| Bioinformatics Organization | Greater Manchester |
| Bioinsights Publishing Ltd | |
| BiologIC Technologies Ltd | |
| Biomathematics and Statistics Scotland | |
| BioMed Central Ltd | |
| Biometrics Ltd | Newport |
| Biomodal | |
| BioMoti | |
| Bionical Emas | |
| Bioniq | |
| BioPartner UK | |
| Biopharm Services Ltd | |
| Biopharma Process Systems Ltd | |
| Biopharma Research Ltd | |
| BioPharmaSpec Ltd | |
| Biorelate Ltd | |
| BIOS Health Ltd | |
| BIOS Health Ltd | |
| Biosceptre International Ltd | |
| Biosynth Ltd | |
| Biotangents Ltd | |
| Biotecnol Ltd | |
| Biotherapy Services Ltd | |
| Birak IT | |
| Birch Hosting Ltd | Staffordshire |
| Bird & Bird, LLP | |
| Bird Marketing Ltd | |
| Birdie | |
| Biringham Research Park | |
| Birkbeck, University of London | Greater London |
| Birkbeck, University of London - Department of Computer Science and Information Systems | Greater London |
| Birkbeck, University of London - Department of Economics, Mathematics and Statistics | Greater London |
| Birmingham City University | West Midlands |
| Birmingham Computer Repair | |
| Birmingham Data Recovery | West Midlands |