| Name | Region |
|---|---|
| GSA Techsource Ltd | |
| GSC Technologies | Greater London |
| GSK plc | |
| GSM Barcoding | County Durham |
| GSMA | |
| GSMZone | South Yorkshire |
| GSPAY Ltd | Lincolnshire |
| GSPK Design Ltd | North Yorkshire |
| GSS Tech Solutions | |
| GT Design & Print Ltd | Essex |
| GT4 Design + Web | |
| GTG Creation Ltd | |
| Gtkmm | Berkshire |
| GTP Excel | |
| GTX Europe Ltd | Hampshire |
| Guaranteed rankings | Cornwall |
| Guardian Angel | |
| Guardz Cyber Ltd | |
| Guavapay | |
| Gud Ideas | |
| GuestFlip Ltd | |
| Guestline | Shropshire |
| GUI Innovations Ltd | Greater Manchester |
| Guild Digital Ltd | |
| Guildford College | |
| Gumpo | |
| Gunpowder Innovations | |
| GURU | Hertfordshire |
| Guru Resourcing Ltd | |
| GusMedia | Warwickshire |
| GW Net-Working Ltd | Hampshire |
| GWD Web Design | |
| gWeb Internet Designs | West Midlands |
| Gwent Cables | Torfaen |
| Gwent Computer Recycling | |
| GWI | Greater London |
| GWS Media | |
| GX Consultancy Ltd | |
| Gyana Ltd | |
| Gylden Pharma Ltd | |
| Gyre Technology Ltd | Surrey |
| Gyrosystem Ltd | Surrey |
| Gyweb & SEO Ltd | |
| Gzeez | |
| H&H Reeds | Cumbria |
| H&R Talent Ltd | |
| Haas Information Management Ltd | Leicestershire |
| Haatch | |
| Habanero Digital | |
| Habitual Health Ltd |