| Global Radiodata Communications Ltd | |
| Global River | |
| Global Search Marketing | |
| Global Surface Intelligence Ltd | |
| Global Telecommunications Ltd | |
| Global Telesat Communications Ltd | |
| Global Virtual Office Solutions | |
| Global VSAT Forum | Hertfordshire |
| Global Web Ltd | Aberdeen |
| GlobalData plc | |
| Globalgraphics Web Design | West Midlands |
| GlobalMedium | |
| GlobalReach Technology | |
| Globe Life Sciences | |
| Globec (UK) Ltd | Oxfordshire |
| GloDerWorks | Worcestershire |
| Gloopro Procurement Systems Ltd | |
| Glorify | |
| Glorious Creative | Greater Manchester |
| Glos PC Repair | |
| Gloucester Computer Services Ltd | |
| Glove.ly | |
| Gloversure Ltd | |
| Glow New Media | Merseyside |
| Glowb Ltd | |
| Glowmedia Ltd | Nottinghamshire |
| Glox Therapeutics Ltd | |
| Glue Studio | |
| Glue42 | Greater London |
| Glush | |
| Glyconics Ltd | |
| Glyndŵr University - School of Computing and Communications Technology | Wrexham County Borough |
| GlyphLab | Cornwall |
| GM Computer Systems Ltd | Cornwall |
| GM Techtronics Ltd | |
| GMA Agency Ltd | Derbyshire |
| GMAP Analytics | |
| GMB Web Designs | Devon |
| GMCVO Databases Ltd | |
| GMG Ventures, LLP | |
| GML Consulting | |
| Gmp web design | Herefordshire |
| GMS Software | Cheshire |
| GMT Systems Ltd | Lancashire |
| GNL Solutions | East Sussex |
| Go Free Range | |
| Go Media Ltd | West Yorkshire |
| Go Mungo SEO Ltd | |
| Go Squared Ltd | |
| Go Tripod Ltd | Cornwall |