| Pontbren Ltd | Welshpool | 2003 |
| Ponteland Auction Mart Company Limited(The) | Ponteland | 1913 |
| Pontfadog Forest School and Community Hub Community Interest Company | Llangollen | 2020 |
| Pontfaen Farm Limited | Whitland | 1997 |
| Pontgarreg Farm Ltd | Carmarthen | 2024 |
| Pontlottyn Farms Limited | Bargoed | 2026 |
| Ponton Farming Company Limited | Grantham | 1953 |
| Pontypinna Farming Limited | Hereford | 2025 |
| Pony Dayz Ltd | Bournemouth | 2019 |
| Pony Magic Glasgow Ltd | Glasgow | 2025 |
| Pony Perfect Ltd | Peterborough | 2025 |
| Pooch Parlour Burnley Ltd | Burnley | 2025 |
| Pooches 2 Ponies Limited | Walsham-Le-Willows | 2023 |
| Poodles & Doodles Ltd | Sheffield | 2025 |
| Poodles & Poms Limited | Northampton | 2025 |
| Pooh Corner, Home for Rescued Horses and Ponies CIC | Dronfield | 2021 |
| Pool & Valentino Ltd | Billericay | 2014 |
| Pool Bridge Farm Ltd | York | 2012 |
| Pool Dog Park Limited | Otley | 2023 |
| Pool Forestry Limited | Sefton | 2018 |
| Pool Green Wood Ltd | Derby | 2025 |
| Pool Hall Farm Limited | Melton Mowbray | 2020 |
| Pool House Farm Limited | Tamworth | 2025 |
| Poole Equine Events Ltd | Market Drayton | 2020 |
| Poole Equine Limited | Market Drayton | 2016 |
| Poole Harbour Agriculture Group CIC | Blandford Forum | 2021 |
| Poole Harbour Shell Fish Co. Limited | Poole | 1974 |
| Poole Oyster Company Limited | Blandford Forum | 1990 |
| Poole Sea Produce Limited | Blandford Forum | 1993 |
| Poole's Farms Limited | Southwell | 1970 |
| Pooley Bridge Limited | Huntingdon | 2013 |
| Poolham Poultry Limited | Derby | 2025 |
| Poolharry Farms Limited | Winchester | 2025 |
| Poolhead Farm Limited | Birmingham | 2024 |
| Poolway Farm Limited | Coleford | 1998 |
| Poornima Organics Ltd | Slough | 2025 |
| Poortvliet Farms Limited | Aylsham | 1956 |
| Pop's Crops Ltd | Leicester | 2025 |
| Popcorning Piggies Guinea PIG Rescue CIC | Gosport | 2025 |
| Pope Agriculture Ltd | Tarporley | 2025 |
| Popeley Farm Ltd | Cleckheaton | 2025 |
| Poplar Farm (Norfolk) Ltd | Diss | 2022 |
| Poplar Farm Flowers Two Limited | Huntingdon | 2017 |
| Poplar Farm Produce Ltd | Downham Market | 2024 |
| Poplar Farming Ltd | London | 2024 |
| Poplar Meadows Ltd | Taunton | 2025 |
| Poplar Nurseries (Wholesale) Ltd | Wisbech | 2005 |
| Poplars Farm (Jenkins) Limited | Near Romsey | 1957 |
| Poplars Farm Stables UK Limited | Moreton In Marsh | 2002 |
| Poplars Growers Limited | Pinchbeck | 2003 |
| Poppetears Cockers and Cockapoos Limited | Laurencekirk | 2015 |
| Poppies Farm Ltd | Hurst | 2021 |
| Poppleton Community Railway Nursery Ltd | York | 2007 |
| Poppy's Animal Services Ltd | Stevenage | 2025 |
| Popsys Reindeer Limited | Chelmsford | 2023 |
| Porcus People Limited | Todmorden | 2013 |
| Porfa Ltd | Amlwch | 2024 |
| Pori Farming Limited | Carlisle | 2026 |
| Porkwell Limited | Driffield | 1995 |
| Porkys Place Ltd | Dorset | 2012 |
| Port Castle Limited | Newton Stewart | 1960 |
| Port Henry Ltd | Aberdeenshire | 2007 |
| Port Luany Ltd | Banff | 2020 |
| Port View Farm Ltd | Faversham | 2012 |
| Porta Pups Dog Creche Ltd | Edinburgh | 2020 |
| Portavadie Forestry Limited | Dunoon | 1996 |
| Portbec Forest Products (UK) Limited | Cardiff | 2011 |
| Porter (Farmers) Limited | Skirlaugh Near Hull | 2005 |
| Porter and Makins Limited | Fakenham | 1957 |
| Porter Contracts (Lisburn) Ltd | Lisburn | 2017 |
| Porter Farm Limited | Belfast | 2026 |
| Porter's Farm Ltd | Weymouth | 2025 |
| Porters Farms (Walpole) Limited | Halesworth | 1964 |
| Porters Tree Care Limited | Leigh On Sea | 2021 |
| Portesham Farm Ltd | Weymouth | 2018 |
| Porth Enys Marine Services Ltd | Penzance | 2023 |
| Porthgain Boats Limited | Fishguard | 2018 |
| Porthkerris Limited | Helston | 2010 |
| Porthywaen Farm Supplies Limited | Wolverhampton | 2017 |
| Portia of Poole Limited | Northumberland | 2003 |
| Portkey EQ Limited | Norwich | 2023 |
| Portknockie Fishing Limited | Buckie | 2005 |
| Portland Alpacas Limited | Portland | 2019 |
| Portland Fishing Company Ltd | Lybster | 2011 |
| Portland Fishing Lakes Limited | Newark | 2007 |
| Portland Isle Limited | Portland | 2012 |
| Portland Oystermen Limited | London | 1983 |
| Portland Oystermen S.O. Limited | London | 2016 |
| Portman Burtley Estate Company Limited | London | 1955 |
| Portman Hunt Limited | Gillingham | 2010 |
| Portmax Limited | Newry | 2023 |
| Portmore Farms, Limited, | Lurgan | 1936 |
| Portnalong Pier Limited | Isle Of Skye | 2017 |
| Portnelligan Farms Ltd | Armagh | 2023 |
| Portobello Limited | Winchester | 2016 |
| Portofino (Fishing) Limited | Fraserburgh | 2006 |
| Portsmouth Tarantulas Limited | Havant | 2019 |
| Portsmouth Tortoise Rescue Limited | Portsmouth | 2021 |
| Portway Farms Limited | Kirtlington | 1989 |
| Poseidon Aquaculture Systems UK Ltd | Glasgow | 2024 |