| Force Over Mass Capital, LLP | |
| Force24 | |
| Forcefield Therapeutics | |
| Forefront RF | |
| Forefrontrf | |
| Foremost IT | Glasgow |
| Foreshore Solutions | |
| Foresight Consulting | |
| Forest Software | |
| Forest Web Design | Berkshire |
| Forestedge Computer Solutions Ltd | |
| Forever Audio | |
| Forever Beta Ltd | |
| Forever Scotland IT Consultancy | Scottish Borders |
| Forfront Ltd | Surrey |
| Forge Agency Ltd | |
| Forge Genetics Ltd | |
| Form Ventures | |
| Form3 | |
| FormaServe Systems Ltd | Buckinghamshire |
| Format-3 | |
| Formisimo Ltd | Greater Manchester |
| Formplus | |
| forms.app | |
| Formula Solutions Ltd | West Sussex |
| Formulate Digital | |
| FormX.ai | |
| Forth Tech | |
| Forth Therapeutics Ltd | |
| ForthStar Ltd | |
| Fortium Technologies Ltd | Bridgend |
| Fortranplus | |
| Fortress Alarms (UK) Ltd | Oxfordshire |
| FortuneFish Ltd | |
| FortySeven | |
| Forum Computers | Lincolnshire |
| Forward Fooding Ltd | |
| Forward Partners | |
| Forward SEO | |
| ForwardSlash Designs | West Midlands |
| Forwessun Test Systems Ltd | Merseyside |
| Fosway Group Ltd | Gloucestershire |
| Fotenix Ltd | |
| Foundation Information Technology Ltd | Hampshire |
| Foundation Multimedia | |
| FounderPass Ltd | |
| Founders and Coders | |
| Founders Capital | |
| Founders Factory Ltd | |
| Founders Forum Group | |