| Image Retail Solutions | Dorset |
| Image Room | Nottinghamshire |
| imageData Group Ltd | |
| Imagen | |
| ImagePlus | |
| Images+ | West Midlands |
| Images-On-Line | |
| Imagic | |
| Imaginary Cloud | |
| Imagination Technologies Ltd | Hertfordshire |
| Imaginet Ltd | Cardiff |
| Imaging Intelligence Ltd | Edinburgh |
| Imagino | |
| Imajinn | Hertfordshire |
| IMC Systems Ltd | |
| IMed Consultancy | |
| iMedia Solutions | |
| Imegamedia | |
| Imersar Ltd | |
| Imesar Ltd | |
| iMeta Technologies Ltd | Hampshire |
| iMetaFilm | |
| Imex Data Communications Ltd | Gloucestershire |
| IMK Consulting | |
| Immaterial | |
| Immediate Future | Greater London |
| Immense Simulations Ltd | Greater London |
| Immerse Media Group Ltd | |
| Immersionn | |
| Immersive Engineering | |
| Immersive Engineering Ltd | |
| Immersive Fox | |
| Immersive Gamebox | |
| Immersive International Ltd | |
| Immersive Labs | |
| Immersive VR Tools | |
| Immervox Ltd | Essex |
| Immigram | |
| Immunocore Ltd | |
| Immunodiagnostic Systems | |
| ImmuONE | |
| ImmuPharma plc | |
| Imobisoft | |
| Imobisoft Ltd | West Midlands |
| Imophoron Ltd | |
| Impact Business Advisors | |
| Impact Computing | Lancashire |
| Impact Investing Conference | |
| Impact IT Solutions (UK) Ltd | Bristol |
| Impact Solutions | |