| Name | Region |
|---|---|
| Knibbs Computer Services Ltd | East Sussex |
| Knight Fire and Security Products Ltd | |
| Knight Optical Ltd | Kent |
| Knil | |
| KnotSync | |
| Know-It (Global) Ltd | |
| know.space | |
| KnowHowe Ltd | West Sussex |
| Knowledgator | |
| Knowledge Computing | Cheshire |
| Knowledge Integration | South Yorkshire |
| Knowledge Partnership | |
| Knowledge Software Ltd | |
| Knowledgefront Ltd | Surrey |
| KO-SU Ltd | |
| Koa Health | |
| Koada Technology | Stirling |
| Koala's | Greater London |
| Koble | |
| Kocho Group Ltd | Greater London |
| KODE Technologies | |
| Koderly Ltd | |
| Kogenta | |
| Kogo Ltd | West Sussex |
| Koios AI | |
| Koko Digital Ltd | |
| Komcept Solutions Ltd | Northamptonshire |
| Komi | |
| Komi | |
| Komodo Digital | Tyne and Wear |
| Konexa | |
| Kongnect Design | Cardiff |
| Konichiwa | |
| Konnect Digital Ltd | |
| Konsentus | |
| Konstructive Ltd | |
| Kontor | |
| Kontrolit.net Ltd | Somerset |
| Koobr | Derbyshire |
| Kooth plc | |
| Koozai Ltd | Hampshire |
| Kopage UK | |
| KOREC | Merseyside |
| Korusys Ltd | Hampshire |
| Kosh Creative | |
| KOTA | |
| Kotelov Globals | |
| Kovach Compuing Services | Isle of Anglesey County Council |
| Kovai Ltd | |
| KPC Creative Communication Ltd |