| GreenLight HR Solutions | |
| Greenpixie | |
| Greenpower Technology Services Ltd | Edinburgh |
| Greensplash Design Ltd | |
| Greensplash Ltd | Cheshire |
| Greentrees International Ltd | Lancashire |
| Greenwood Campbell Ltd | |
| Greepoint Computer Services Ltd | Hampshire |
| Greip | |
| Gresham Technologies plc | |
| Grey Alien Games | Dorset |
| Grey Matter Ltd | Devon |
| Grey Technology Ltd | |
| Greyfly Ltd | |
| Greyparrot AI | |
| GreyRigge Associates Ltd | |
| Greywolf Therapeutics | |
| Greywood.Digital | Greater London |
| Grid Edge Ltd | |
| Grid Smarter Cities | |
| GridPP | |
| Griffin Financial Technology Ltd | |
| Griffin Forensics Ltd | Northamptonshire |
| Grimethorpe Electronic Village Hall | South Yorkshire |
| Grimsby Institute | |
| Grip | Greater London |
| Gripped Ltd | |
| GRIT Digital Ltd | |
| Gritstone Computers | North Yorkshire |
| Grizzle | |
| Grizzle & Tan | |
| Grizzly | Bristol |
| GRM Digital | |
| Ground Control Technologies UK Ltd | |
| Group Piex | Derbyshire |
| Groups, Algorithms and Programming | Fife |
| Grove Consultants | Wiltshire |
| Grow Create Ltd | Buckinghamshire |
| Grow Online Marketing | Hertfordshire |
| Growth Capital Ventures Ltd | |
| Growth London | |
| Growth Savvy Ltd | |
| GrowthGirls | |
| Growthlabs | |
| GrowthRocks | |
| GrowUp Famrs | |
| Gruff Goat | |
| Gruvi | |
| Grŵp Llandrillo-Menai | |
| Gryphon Computer Support Ltd | Cornwall |