| Fuzzy Lime | Glasgow |
| FWD IP Ltd | |
| Fwoss | Cardiff |
| FX Digital | |
| FXhome Ltd | Norfolk |
| FydeOS | |
| Fylde Telecom | Lancashire |
| Fyma | |
| Fyxer AI Ltd | |
| G & B Electronic Designs Ltd | Hampshire |
| G A Assembly Ltd | South Yorkshire |
| G comm | Suffolk |
| G&L Scientifc | |
| G&V is a Venture Brands Agency | |
| G-Net Online | Essex |
| G-Research | Greater London |
| G.B. Telecom (Scotland) Ltd | Scottish Borders |
| G.E.T.Internet Services | Northamptonshire |
| G.Network Communications | |
| G.T.I. Ltd | Glasgow |
| G2 Digital | Surrey |
| G2 Integrated Security Solutions Ltd | North Yorkshire |
| G3 Systems Ltd | |
| G3G | Surrey |
| G8 LMW (Consulting) Ltd | Leicestershire |
| GA Avency | |
| GAAP Digital | |
| Gabriel Scientific Consultancy Ltd | Greater Manchester |
| Gadget Recycling Ltd | |
| Gadget Repair Experts | |
| Gaeta Therapeutics Ltd | |
| Gain Line | |
| GainX | |
| Galleon Systems Ltd | West Midlands |
| Gallium Ventures | |
| GALTech Technologies Private Ltd | |
| Galvani Bioelectronics | |
| Galvany Pharma | |
| Game Enders Ltd | |
| Game Options Ltd | |
| Game People | Devon |
| Game Retail Ltd | Hampshire |
| Game Reviews | |
| GameAnalytics | |
| GameBench | |
| GameDev Network Ltd | |
| Gamer Tech | |
| GamersFirst.com | Dundee |
| GamersRdy | |
| Gamesbrief | |