| IBioIC | |
| Ibis Vision | |
| IBS Intelligence | |
| IC Mobile Lab | Greater Manchester |
| IC Resources | Berkshire |
| IC Web Design | Newport |
| IC-E Group | Greater Manchester |
| iCandi Apps Ltd | |
| Icaps Ltd | Gloucestershire |
| Icarus Communications Ltd | |
| iCatching | Oxfordshire |
| ICC Northern UK Ltd | West Yorkshire |
| Ice Digital Marketing Ltd | |
| Iceberg Media | |
| iceblue Internet | |
| ICEcoder Ltd | |
| Icecream Digital | |
| Iced Digital Ltd | |
| iCede Solutions Ltd | Merseyside |
| Icedrive | |
| iCEIBA Ltd | |
| IceMOS Technology Ltd | |
| Iceni Technology Ltd | Norfolk |
| iCentric | |
| iCentric Agency | |
| ICEO | |
| Icera | Bristol |
| IceRobotics Ltd | Edinburgh |
| Icestar Media | Hertfordshire |
| Ichicoo Ltd | West Yorkshire |
| ichorbio | |
| ICit Business Intelligence Ltd | Cheshire |
| ICO Systems | |
| iCode Systems Ltd | Hampshire |
| Icon Digital Services Ltd | West Sussex |
| Icon Research Ltd | |
| Icon Web Services | Cornwall |
| ICON.net Ltd | Gloucestershire |
| iConcept Ltd | |
| ICONI Software Ltd | Belfast |
| Iconic | |
| Iconic Blockchain Ltd | |
| Iconic Digital Marketing Consultants Ltd | |
| iConnect Digital | |
| Iconography Ltd | Somerset |
| Iconology Ltd | Kent |
| ICONOMI Ltd | |
| iCONQUER Ltd | |
| ICP Networks Ltd | Cheshire |
| ICP Search | |