| People HR | |
| People Per Hour Ltd | |
| PeopleFlow | |
| PeopleSolutions | |
| Peplobio Ltd | |
| Peppa.io | |
| Pepper Creative Ltd | Isle of Wight |
| Pepper Money Ltd | |
| Pepperdog Design Ltd | |
| Peppermint Labs | |
| Peppermint Technology | |
| Peppers Cable Glands Ltd | Surrey |
| Peppy | Greater London |
| Peptone Ltd | |
| Peratech Holdco Ltd | North Yorkshire |
| Perceptis Ltd | Staffordshire |
| Perceptual Robotics Ltd | |
| PerchPeek | |
| Percival | Gloucestershire |
| Peregrine Software | |
| Perfect Image | Tyne and Wear |
| Perfect Imaging Ltd | |
| Perfect Storm | |
| Perfect Storm Media Ltd | |
| Performance Climate Systems Ltd | |
| Performance Computers | |
| Performance Ltd | Cheshire |
| Peripatus Ltd | East Sussex |
| Peripheral Vision (Technology) Ltd | Berkshire |
| Perkbox | |
| Perlego Ltd | |
| Permanoid Ltd | Greater Manchester |
| Permutive | |
| Perrywell | Warwickshire |
| Persica Pharmaceuticals Ltd | |
| Persistence Market Research | |
| Person Centred Software | |
| Personal Computer Help | |
| Personal Web Guys | |
| Personalyze Ltd | |
| Personify XP | |
| Perspectiv | |
| Perspective CMMS | West Dunbartonshire |
| Perspectum Diagnostics | |
| Perspicuity Ltd | Somerset |
| Peru Consulting Ltd | |
| Pervade Software | |
| Pervisell Ltd | Buckinghamshire |
| PetaGene | |
| Petalite | |