| Pentrenant Poultry Limited | Newtown | 2014 |
| Penwine Farms Limited | Bodmin | 2011 |
| Penwood Nurseries Limited | Newbury | 2001 |
| Penycoed Dairy Ltd | Carmarthen | 2019 |
| Penycoed Farms Limited | St Clears | 2002 |
| Penyghentshepherdess Limited | Skipton | 2025 |
| Penygroes Ltd | Bicester | 2025 |
| Penylan Farm Limited | Caldicot | 2012 |
| Penywaun Farms Limited | Newport | 2002 |
| People Plant Trees CIC | Carlisle | 2024 |
| Peplow Farms Limited | Market Drayton | 2014 |
| Pepperberry Farm Limited | Bridgwater | 2024 |
| Peppercorn Farm Limited | Taunton | 2015 |
| Peppers Canine Services Ltd | London | 2023 |
| Peppers Farming Company Limited | Cambridge | 2009 |
| Pepys Services Ltd | Salisbury | 2003 |
| PER Hortum Ltd | Beckenham | 2021 |
| Perception Enterprises Limited | Northmoor | 2016 |
| Perch Hill Vineyard Limited | Warminster | 2014 |
| Percival (Cornwall) Limited | Helston | 2023 |
| Percival Farm Ltd | Sutton | 2024 |
| Percusssion Limited | Newmarket | 2018 |
| Percy F.Richardson Limited | Chelmsford | 1961 |
| Perdiswell Limited | Woodstock | 2012 |
| Perdix Valley Ltd | Newcastle Upon Tyne | 2021 |
| Perdon Organics Limited | Taunton | 2006 |
| Peredurus Limited | Malton | 2025 |
| Peregrine Livestock Ltd | Stockbridge | 2022 |
| Peregrine Sokol Ltd | Manchester | 2017 |
| Perennial Harvest Ltd | St. Austell | 2014 |
| Perexky Ltd | Leicester | 2021 |
| Perfect Aquatics Holdings Limited | Luton | 2016 |
| Perfect Aquatics Ltd | Luton | 2016 |
| Perfect Aquatics Property Limited | Luton | 2016 |
| Perfect Chips Ltd | Boston | 2019 |
| Perfect Pasture Limited | Jedburgh | 2015 |
| Perfect Perennials Limited | Stowmarket | 2004 |
| Perfect Produce Ltd | Newcastle Upon Tyne | 2013 |
| Perfect Versa Ltd | Shrewsbury | 2025 |
| Perfections Construction Limited | Corby | 2025 |
| Perfectly Fresh Cheshire Limited | London | 2016 |
| Perfectly Pampered Pups and Pets Ltd | Rugby | 2022 |
| Perfekt COW Nutrition Limited | Aberaeron | 2017 |
| Performance Farriery & Consultancy Ltd | Runcorn | 2017 |
| Performance Farriery Limited | Burton-On-Trent | 2020 |
| Performance K9 Dog Training Ltd | London | 2022 |
| Performance Paws Homestays Ltd | Chelmsford | 2024 |
| Performance Paws Outdoors Ltd | Chelmsford | 2023 |
| Performance Paws Training Ltd | Chelmsford | 2024 |
| Performance Pullets Limited | Penrith | 2011 |
| Performance Recorded Lleyn Breeders Ltd | Bath | 2023 |
| Performance UK Limited | Cambridge | 2005 |
| Performane Paws Walks and Services Ltd | Chelmsford | 2024 |
| Peritum Pests and Services Limited | Fareham | 2018 |
| Perkins Farm Appledore Ltd | Ashford | 2021 |
| Permabox Global Ltd | Ruislip, | 2026 |
| Permabuild Building Contractors Limited | Yeovil | 2009 |
| Permafuture Agroecology Limited | Doncaster | 2015 |
| Permalogical Ltd | Ware | 2014 |
| Permanent Agriculture Ltd | Great Dunmow | 2025 |
| Permia Sensing Limited | London | 2021 |
| Pernet Consulting Ltd | Whitby | 2025 |
| Perrins Hill Ltd | Dorchester | 2012 |
| Perris@Hollington Limited | Berkshire | 2002 |
| Perry Farm Limited | Sturminster Newton | 2014 |
| Perry Farming Limited | Bristol | 2023 |
| Perry Hill Farm Limited | Hereford | 2000 |
| Perry Hill Precision Company Limited | Hereford | 1958 |
| Perry's Bridge Farm Limited | Crewkerne | 2006 |
| Perry's Plants Limited | Scarborough | 2003 |
| Perryhill Orchards Limited | Hartfield | 1988 |
| Perseverance Farm Limited | Ipswich | 1997 |
| Pershore Farming Limited | Pershore | 2001 |
| Persian Land Ltd | Surbiton | 2023 |
| Persian Silk Rugs Ltd | London | 2007 |
| Persicle Limited | St. Asaph | 1997 |
| Persse Farriers Ltd | Exeter | 2009 |
| Pert Fishings Limited | Kincardineshire | 2007 |
| Perth Community Farm Ltd | Perth | 2018 |
| Pertheirin Eggs Limited | Newtown | 2021 |
| Perthneuadd Limited | Cross Hands | 2003 |
| Perthshire Forestry Services Ltd | Perth | 2024 |
| Perthshire Toy Terrier Limited | Crieff | 2008 |
| Perthshire Tree Planting Ltd | Perth | 2022 |
| Pesca Limited | Penryn | 2025 |
| Pest & Hygiene Services Ltd | Market Rasen | 2023 |
| Pest BYE Limited | London | 2025 |
| Pest Clear Environmental Ltd | Manchester | 2024 |
| Pest Contract Services Ltd | Alton | 2025 |
| Pest Control Hampshire Ltd | Ealing | 2014 |
| Pest Control U.K Ltd | Bolton | 2017 |
| Pest Force Scottish Borders Limited | Kelso | 2025 |
| Pest Guard NW Limited | Crewe | 2016 |
| Pest Link Ltd | London | 2018 |
| Pest Piper Ltd | London | 2022 |
| Pest Right Limited | Cambridge | 2011 |
| Pest-Techz Ltd | West Bromwich | 2021 |
| Pestakers Limited | Carterton | 2025 |
| Pestcotek Limited | Gainsborough | 2012 |
| Pestforce Bath, Swindon & Wiltshire Ltd | Chippenham | 2023 |