| Gooseberry Planet Ltd | |
| GopherCon UK | |
| Goplan | |
| GoRamp | |
| Goranga Tech | |
| Gordano Ltd | Somerset |
| Gordon Associates | Gloucestershire |
| Gordon Wilson (Process Systems) Ltd | East Sussex |
| GoReport | |
| Gorilla Marketing | |
| Gorilla360 | |
| GoSimpleTax Ltd | |
| GOSS Interactive | Devon |
| Gotronic Ltd | West Midlands |
| Gould Hall | Lancashire |
| Gousto | Greater London |
| GovData Ltd | |
| Government Communications Headquarters | Gloucestershire |
| GoVirtual Ltd | |
| Gower College Swansea | |
| Goznet Systems | Surrey |
| GP Strategies Ltd | |
| GP4PC | Cambridgeshire |
| GPM Development Ltd | Greater London |
| GPM Network Ltd | |
| GQ Design & Marketing | Cambridgeshire |
| Grabyo Ltd | Greater London |
| GrabzIt Ltd | |
| Grade1 | Hampshire |
| Gradient Labs AI | |
| GradTouch | |
| Graduate Recruitment Bureau | |
| Gradwell Communications Ltd | Somerset |
| Graeme Powell Marketing Ltd | |
| Grafx | Gloucestershire |
| Graham Langley Ltd | Greater London |
| Graide | |
| Gram Games | |
| Grampian Software | Aberdeen |
| Grampian Technical Services | Aberdeen |
| Grand Parade | |
| Grand Web Design | |
| Granite Chips Ltd | |
| Granola | |
| Grant McArthur SEO & Design | |
| Grant McGregor | Edinburgh |
| Grantham Computer Centre | Lincolnshire |
| Grapefruit Digital Ltd | |
| Grapevine | |
| Grapevine Communications (London) Ltd | Hertfordshire |