| IgniteData | |
| IgniteData | |
| Ignition Search | |
| Ignition Transformation | |
| Igniyte Ltd | |
| Ignota Labs | |
| IGOO Ltd | Merseyside |
| iGOweb | |
| iGreet.co Ltd | |
| igroup | |
| Igugu Global Ltd | |
| iGuru Software Ltd | |
| iHasco | |
| iHorizon | |
| Ihs | |
| iiCon | Essex |
| IIH Global | |
| iiko | Greater London |
| iinvoicing.com | Greater London |
| Iis monitor | Greater London |
| IIZUKA Software Technologies Ltd | West Midlands |
| IJT Direct Ltd | Somerset |
| IJYI Ltd | |
| Ikarovec | |
| Iken Business Ltd | Bristol |
| iknowthe.net | Oxfordshire |
| Ikon | Greater London |
| Ikona IT Ltd | Cardiff |
| Ikonic | Greater Manchester |
| IKONIX Telecoms Group | |
| Ikroh | Buckinghamshire |
| iKVA Ltd | |
| ILC Therapeutics Ltd | |
| Iles Systems Ltd | |
| Ilkeston Web Design | |
| Ilkley IT Services | West Yorkshire |
| Ilkley Web Design and Marketing | West Yorkshire |
| Illicit Web Design | Devon |
| Illingworth Research Group | |
| Illuminaries Ltd | South Yorkshire |
| Illuminate Financial Management Ltd | |
| Illumo Digital | |
| Illustrate Digital Ltd | Cardiff |
| iLoF | |
| ILSoft Ltd | |
| IMA | |
| IMAD Scotland | |
| Image Analysis Group | |
| Image Concepts (Yorkshire) Ltd | |
| Image Creation | North Yorkshire |