| Furness.net | Cumbria |
| Further | Norfolk |
| Further Network | |
| Fuse Diagnostics Ltd | |
| Fuse Technologies | |
| Fusebox | |
| Fused Design | North Yorkshire |
| FuseMetrix Group Ltd | Buckinghamshire |
| Fusion Antibodies plc | |
| Fusion Global Capital | |
| Fusion Media Europe Ltd | Kent |
| Fusion New Media | Cumbria |
| Fusion Unlimited | |
| Fusionsoft Ltd | Berkshire |
| Fusionxs | |
| Futora | |
| Futuba Manufacturing Ltd | Lancashire |
| Futura Investments Ltd | |
| Futura Medical | |
| Futura Retail Solutions Ltd | Berkshire |
| Future | |
| Future Automation | |
| Future Computer Services Ltd | |
| Future Design (UK) Ltd | Greater London |
| Future Design Consultants | |
| Future Food-Tech London | |
| Future Generation Services | Kent |
| Future Internet Services | Cardiff |
| Future London Academy | |
| Future Network Distribution Ltd | Oxfordshire |
| Future Networks 7/24 Ltd | Greater London |
| Future plc | |
| Future Studios | Denbighshire |
| Future Worlds | |
| Future-Tech SCI Ltd | Berkshire |
| FutureLine | |
| FutureMatch | |
| Futurenet Designs | Kent |
| FutureSens | |
| FutureServers.net | Cornwall |
| Futurestate Investment Ltd | Edinburgh |
| Futurestech | |
| Futurestore | Cornwall |
| Futuresys Ltd | Hampshire |
| Futureworks | |
| Futurlab | East Sussex |
| Fux Marketing | |
| Fuze Design | Berkshire |
| Fuzey Ltd | |
| Fuzzelogic Solutions Ltd | |