| Flip Computing Ltd | |
| Flip.uk | |
| Fliplet | |
| Flipside Health | |
| Flipside Web Design | Devon |
| Flo Design Ltd | |
| Flo Design Ltd | |
| Flo Health UK Ltd | Greater London |
| Flo3 Ltd | |
| Float Yard Ltd | |
| Flock Design & Advertising Ltd | |
| Flock Ltd | |
| Flock Studio | |
| FLock.io | |
| Flok | |
| FloLive | |
| Floodlight | |
| Florian Amrhein | Cambridgeshire |
| Flosverse Techsphere | |
| Flotek Group Ltd | |
| Flourish | |
| Flourish CRM Ltd | |
| Flow Digital Ltd | Tyne and Wear |
| Flow Engineering | |
| Flow Online | |
| Flow Partners (London) Ltd | |
| Flow Simulation Ltd | South Yorkshire |
| FloweMedia | Suffolk |
| FlowFoundry Holding Ltd | |
| Flowmoco Ltd | |
| Flown | Greater London |
| Flowtech Fluidpower plc | |
| Floww | |
| Flowzone Ltd | Berkshire |
| FLOX | |
| Fluence World | |
| Fluency Group Ltd | |
| Fluent | |
| Fluent (Cambridge) Ltd | Cambridgeshire |
| Fluent Ltd | Buckinghamshire |
| Fluent Technology Ltd | Belfast |
| Fluentify | |
| Fluento | |
| Fluid Creative Media | |
| Fluid Gravity Engineering Ltd | |
| Fluid Ideas Ltd | |
| Fluid Labs | |
| Fluid Pixel Ltd | Tyne and Wear |
| FLUID7 | |
| FluidFlow | Derry and Strabane |