| Phyto Nexa Labs Ltd | London | 2026 |
| Phytoforge Limited | Leeds | 2026 |
| Phytosynth Bioscience Ltd | Nottingham | 2026 |
| Phytotherapeutix Ltd | Pulford | 2019 |
| PI Agsciences (UK) Limited | London | 1998 |
| PI Hahiroth Consulting Ltd | Penicuik | 2025 |
| Pibwr Alpacas Limited | Carmarthen | 2025 |
| Piccaver Farms Limited | Spalding Lincolnshire | 1995 |
| Piccolo Orto CIC | Helston | 2024 |
| Picea Forestry Holdings Limited | Clerkenwell | 2015 |
| Pick Farm Machinery Limited | Chichester | 2025 |
| Picked Watton Farms Limited | Southampton | 1992 |
| Picken Limited | Holt | 2002 |
| Pickering Contractors Limited | Gainsborough | 2013 |
| Picketts Farm Ltd | Colchester | 2025 |
| Picks of Tugby Limited | Tugby | 2018 |
| Picks Organic Farm Ltd | Leicester | 2012 |
| Pickstock Farms (Scotland) Limited | Lockerbie | 2023 |
| Pickup Farms Limited | Bolton | 2023 |
| Pickwell Gardens Limited | Devon | 1958 |
| Pickwell Plant Limited | Melton Mowbray | 2009 |
| Picnic Basket Farm Ltd | Carmarthen | 2021 |
| Pico Springs Limited | Tilbury | 2009 |
| Picone Limited | Waltham Abbey | 2013 |
| Picton Castle Dairy Limited | Cardiff | 2013 |
| Picton Poultry Limited | Norfolk | 2025 |
| Picts Forge Limited | Haywards Heath | 2013 |
| Pictstonhill Farm Stables Limited | Perth | 2019 |
| Picture Plane Ltd | Shaftesbury | 2014 |
| Piddinghoe Farms Limited | Alton | 2026 |
| Piddle Valley Chicken Ltd | Poundbury | 2016 |
| Pidgen Wood Ltd | Warrington | 2025 |
| Pierce Bros (Farms) Limited | Berkeley | 2004 |
| Pierce Farms Limited | Faversham | 2011 |
| Piercy Hardwoods Limited | Witney | 2003 |
| Piermill Bloodstock Limited | Cambridge | 2013 |
| Pierowall Bay Ltd. | Orkney | 2005 |
| Piers Bratton Cattle Services Limited | Stafford | 2005 |
| Pierston Manor Farm Limited | Yeovil | 2018 |
| Pies Hill Farms Limited | Bury St Edmunds | 1960 |
| PIG Improvement Company UK Limited | Basingstoke | 1962 |
| PIG Innovation Centre Limited | Antrim | 2006 |
| Pigdon Farm Limited | Newcastle Upon Tyne | 2007 |
| Pigeon Watch Ltd | Newtownards | 2009 |
| Piggin the Dream Ltd | Chelmsford | 2010 |
| Piggly Wiggly Properties Limited | Skegness | 2009 |
| Piggots (Lakeside) Limited | Stroud | 2025 |
| Piggott's Poultry Breeders Ltd | Dunstable | 2013 |
| Piglets Adventure Farm Limited | York | 2015 |
| Pigment Organic Dyes CIC | Newton Abbot | 2023 |
| Pignus Limited | Badminton | 1999 |
| Pigs in MUD Limited | Manchester | 2018 |
| Pigshill & Clarrick Woods Community Interest Company | Torpoint | 2013 |
| Pigsty Farm CIC | Ryde | 2022 |
| Pigture Perfect Farm Limited | Bridgend | 2024 |
| Pike House Farm Ltd | Littleborough | 2012 |
| Pikehall Farming Limited | Macclesfield | 2019 |
| Pikerace Limited | Melton Mowbray | 1997 |
| Pikes Limited | Newport | 2005 |
| Pikins Farm Eggs Ltd | Caersws | 2026 |
| Piks Nlin Agriculture Ltd | Guisborough | 2025 |
| Pilatus Limited | Great Abington | 2020 |
| Pilgrim Farming Limited | King'S Lynn | 2017 |
| Pilgrims Farming Company Limited | Salisbury | 1997 |
| Pilipala Farm Limited | Swansea | 2021 |
| Pilkington Farms Limited | Daventry | 2013 |
| Pilkington Farmstead Limited | Manchester | 2025 |
| Pillaton Foods Limited | Cannock | 2016 |
| Pillaton Hall Farm Limited | Penkridge | 2012 |
| Pilling GUN Dogs Limited | Preston | 2021 |
| Pilning Pastures Ltd | Bristol | 2024 |
| Pilot - "B" Ltd | Cirencester | 2016 |
| Pilot Star Limited | Wallsend | 2015 |
| Pilsdon Farm Limited | Bridport | 2008 |
| Pilson Group Limited | Great Yarmouth | 1999 |
| Pilsworth Fishery Limited | Blackburn | 2020 |
| Pimbo Nurseries & Garden Centre Limited | Lancashire | 2003 |
| Pimbury Equine UK Ltd | Bath | 2024 |
| Pinckney Green Woods CIC | Bradford On Avon | 2017 |
| Pincots Farm Ltd | Cheltenham | 2018 |
| Pindar Partners Ltd | Scarborough | 2006 |
| Pinder Livery Limited | Stanmore | 2024 |
| Pine & Pasture Ltd | St. Asaph | 2026 |
| Pine Drift Fisheries Ltd | Nottingham | 2025 |
| Pine Farm Welfare Ltd | Bury St. Edmunds | 2025 |
| Pine Farms Limited | Louth, | 1963 |
| Pine Hill Farm Ltd | Lisburn | 2024 |
| Pineapple Stud Limited | Watford | 2011 |
| Pineridge Tree Care & Site Services Ltd | Ashford | 2020 |
| Pinetops Nurseries Limited | Lymington | 1976 |
| Pinetree Dog Retreat Limited | Kirkton Of Auchterhouse | 2023 |
| Pinewood Cattery Limited | Surrey | 2007 |
| Pinewood Christmas Trees Ltd | Newport | 2018 |
| Pinewood Farm Ltd | Lancaster | 2025 |
| Pinewood Nurseries Ltd | Slough | 2007 |
| Pinewood Treecare Limited | Ruislip | 2006 |
| Pinfold Farm Fresh Meats Limited | York | 2014 |
| Pingle Nook Holdings Ltd | Huddersfield | 2018 |
| Pingle Poultry Limited | Bucknall | 2017 |
| Pinglestone Estate Limited | London | 2016 |