| Fairline Distribution Ltd | Kent |
| FAL Systems Ltd | |
| Falcon Computers Ltd | Tyne and Wear |
| Falkin | |
| Falkon Digital Ltd | Cheshire |
| Fallen Leaf Design Ltd | West Yorkshire |
| Fallouh Healthcare | |
| Falmouth Launchpad Futures | Cornwall |
| Falmouth University | |
| Fame | |
| Fan Studio Mobile App Development UK Ltd | Greater London |
| Fanatic | |
| Fanbytes | |
| Fandango Digital Ltd | |
| FanFinders Ltd | |
| Fanfuel | |
| Fantastic Machine | |
| Fanuc UK Ltd | West Midlands |
| Fanvue | |
| Faradai | |
| Faraday Printed Circuits | Tyne and Wear |
| Farfetch UK Ltd | Greater London |
| Fargo Systems Ltd | |
| Farham IT Support | |
| Farmplan | Herefordshire |
| FarmWizard | Belfast |
| Farnborough College of Technology | |
| Farnborough International Airshow | |
| FarSite Communications Ltd | Hampshire |
| Fast Biopharma | |
| Fast Data Science Ltd | |
| Fast Fwd Multimedia Ltd | |
| Fast MDx | |
| Fast Name | County Durham |
| Fast Recruitment Websites | South Yorkshire |
| Fast2host | Cambridgeshire |
| Fasthosts | Gloucestershire |
| Fastlink | Wiltshire |
| Fastnet International Ltd | East Sussex |
| FastNetMon | |
| Fat Cow Media Ltd | |
| Fat Fish Marketing | |
| Fat Graphics | Somerset |
| Fat Heads Creative Studio Ltd | Greater Manchester |
| Fat Media Ltd | Lancashire |
| Fat Promotions | East Sussex |
| FATdrop | |
| Fathom | Belfast |
| FaultFixers Technologies Ltd | |
| Favoured | |