| Kinetica Systems Ltd | |
| King Creation Ltd | Bristol |
| King Kong Digital Ltd | |
| King of Web Designs | |
| King's College London | Greater London |
| King's College London - Department of Informatics | Greater London |
| King's College London - Department of Mathematics | Greater London |
| Kingdom Technologies Ltd | |
| Kingfield Electronics Ltd | |
| KingIT Solutions | |
| KingsBeam Computing | |
| Kingston University London | Greater London |
| Kingston University London - Faculty of Engineering, Computing and the Environment | Greater London |
| Kingswood Consulting (UK) Ltd | Cambridgeshire |
| Kino Creative | Tyne and Wear |
| Kinomica | |
| Kinsetsu | |
| Kintoweb | West Sussex |
| KIRHYIP | |
| Kiri Technologies Ltd | |
| Kirkmoor.com Ltd | Dumfries and Galloway |
| Kirkoswald Capital Partners, LLP | |
| KiS Marketing Ltd | Surrey |
| Kisaco Research | |
| KisanHub | |
| KISS Communications | |
| KISSoftware Solutions | Gloucestershire |
| Kiswebs Ltd | Glasgow |
| KIT York | |
| KIT-AR | |
| Kite IT Ltd | Glasgow |
| KITVENDR | |
| KJ-H Computing | Berkshire |
| KK Systems Ltd | East Sussex |
| Klarient Ltd | West Yorkshire |
| Klarytree | |
| Klave Technical Solutions | |
| Kleecks Ltd | |
| Kleene | |
| Kleo Digital | |
| Kliasoft | |
| Klink Finance | |
| KLOC Digital Solutions Ltd | Berkshire |
| KM Data Cabling Ltd | Greater London |
| KMS Software | |
| KMsoft Ltd | |
| Kmtec Ltd | |
| KN Digital | |
| Knarkz | |
| KNEXGEN Ltd | |