| Keele University | Staffordshire |
| Keele University - School of Computer Science and Mathematics | Staffordshire |
| Keen Digital Marketing Ltd | |
| KEEN IT Support | |
| Keep It Simple Web Design & SEO | |
| Keepi | |
| Keera Studios | |
| KeeTech Ltd | West Midlands |
| Keith Cirkel | |
| Kelgray Products Ltd | West Sussex |
| Kelkoo | |
| KellySEO | West Midlands |
| Kelso Pharma | |
| Kelvin Capital | |
| Kelvin Design | |
| Kelvin TOP-SET Ltd | North Ayrshire |
| Kemo Ltd | Kent |
| Kempston Controls | Northamptonshire |
| Kenable | Merseyside |
| Kenamre Resources plc | |
| Kencomp Internet Ltd | Cumbria |
| Kendata Electronic Systems Ltd | Hampshire |
| Kene Partners | |
| Kennek Solutions Ltd | |
| Kennet Partners Ltd | |
| KennettNet Software Ltd | Bedfordshire |
| Kensio Software | |
| Kent Medical Imaging | Kent |
| Kent Modular Electronics Ltd | Kent |
| Kepler Interactive | |
| Kernow Software Ltd | |
| KernowTek | Cornwall |
| Kerv | |
| Kesher Communications | Greater Manchester |
| Kesmalea Therapeutics | |
| Kestrel Commercial Ent. Ltd | Surrey |
| Kestrel Web Solutions | Pembrokeshire |
| Kestronics Ltd | Hertfordshire |
| Keswick Computer Solutions | Cumbria |
| Ketchup Marketing Ltd | |
| KETS Quantum Security Ltd | |
| Kettering Laptops | |
| Kevin Muldoon | Edinburgh |
| KEW Technology Ltd | |
| Kewcomputers | Hampshire |
| Key Capital Partners, LLP | |
| Key Computer Applications Ltd | Greater Manchester |
| Key Data | Isle of Anglesey County Council |
| Key Designs | Greater Manchester |
| Key Digital Agency Ltd | Dorset |