| P.Bartholomew Holdings Ltd | Sittingbourne | 2020 |
| P.Berry Group Ltd | Penrith | 2026 |
| P.C. Tinsley Limited | Masham | 1957 |
| P.C.J.M.W. Ltd | Horsford | 2006 |
| P.D. Chapman Limited | Norwich | 1936 |
| P.D. Hook (Breeders) Limited | Bampton | 1993 |
| P.D. Hook (Rearing) Limited | Bampton | 1999 |
| P.D. Services Scotland Ltd | Banchory | 2022 |
| P.D. Smales Limited | Winchester | 1975 |
| P.D.H. Farming Limited | Southampton | 2004 |
| P.D.Hook(Hatcheries)Limited | Bampton | 1963 |
| P.E. King (Bristol) Limited | Bristol | 1971 |
| P.E.D.C Limited | Bourne | 2019 |
| P.F.B.G. Limited | Oswestry | 2001 |
| P.G Aquacultures Ltd | Cardiff | 2006 |
| P.G. RIX (Farms) Limited | Colchester | 1964 |
| P.G.Rogers Ltd | Plymouth | 2025 |
| P.Gatehouse Ltd | Worcester | 2007 |
| P.Gilbert Livestock Ltd | Spilsby | 2019 |
| P.H. and L.C. Jowett Limited | Salisbury | 1986 |
| P.H. Dance & SON Limited | Builth Wells | 1970 |
| P.H. Higton Plant Hire & Agcontractors Limited | Leek | 2015 |
| P.H. Wheaton & Co. (Farms) Limited | Braintree | 1974 |
| P.Hughes Limited | Evesham | 1957 |
| P.I.T Farms Ltd | Armagh | 2019 |
| P.J. and W.M. Vero Limited | Atherstone | 1977 |
| P.J. Burke (Kent) Limited | Marden | 1984 |
| P.J. Davey & Co. Ltd | Norwich | 2000 |
| P.J. Duffy & SON (Farms) Limited | Algarkirk Boston | 1986 |
| P.J. LEE & Sons Limited | Ely | 2019 |
| P.J. Rowland & Sons (Farmers) Limited | Amesbury | 1977 |
| P.J. Vanassche Limited | Ventnor | 1974 |
| P.J. Wilkinson and SON Limited | Horncastle Lincolnshire | 1954 |
| P.K. Cook & Daughters Limited | Hull | 2009 |
| P.L. Ellis & SON Limited | Diss | 1965 |
| P.L.W. Mills Limited | Peterborough | 1973 |
| P.M. Ashburner Limited | Baxenden, Accrington | 1992 |
| P.M. Bradley (Farms) Limited | Grantham | 1974 |
| P.M. Garratt Limited | Nottingham | 1974 |
| P.Maguire Rural Solutions Ltd | Trearddur Bay | 2026 |
| P.N. & D.V. Atkin and Daughters Company Limited | Tideslow | 1988 |
| P.N. & M.P. Hamilton Limited | Plymouth | 1977 |
| P.P. & D.F. Redgate Limited | Moor Green | 1992 |
| P.R. & R.H. Leggett Limited | Ipswich | 1999 |
| P.R. Newson Ltd | Buntingford | 2003 |
| P.R.& I.C.Rymer Limited | Brackley | 2004 |
| P.R.C. Maintenance Services Limited | Llandeilo | 2003 |
| P.R.G. Swayne Limited | Faversham | 2005 |
| P.S. & J.E. Ward Ltd | Wisbech | 2007 |
| P.S. Partridge Limited | Ipswich | 1959 |
| P.T. Hunnisett Limited | Chandler'S Ford | 2014 |
| P.V Brockhills Limited | Thirsk | 2007 |
| P.W. Broadberry Farms Limited | Retford | 1988 |
| P.W. Spray & Sons Limited | Nr. Bassingham | 1960 |
| P.W.May Contracting Ltd | Harlow | 2009 |
| P.Z.Arb Ltd | Wolverhampton | 2019 |
| P1 Aquatics Ltd | Telford | 2025 |
| PA & CT Barrett Limited | Taunton | 2007 |
| PA Tree and Garden Care Ltd | Swanley | 2021 |
| Pa's Paws Ltd | Crewe | 2025 |
| Pace ARB Limited | Warminster | 2013 |
| Pacey Project Consultancy Ltd | Caterham | 2020 |
| Pacific Fresh Produce Ltd | London | 2013 |
| Pack Farms Ltd | Dungannon | 2025 |
| Packaged Feeds Limited | Milton Keynes | 2019 |
| Packaged Organics Limited | Milton Keynes | 2024 |
| Packhorse Farm Limited | Exeter | 2008 |
| Packington Poultry Limited | Burton-On-Trent | 2014 |
| Pactolus Investments Limited | Leatherhead | 2022 |
| Padbury Group Limited | Northampton | 2006 |
| Paddington Farm Trust Limited | Glastonbury | 1983 |
| Paddlebrook Limited | Leamington Spa | 2024 |
| Paddlefish Ltd | St Columb | 2023 |
| Paddock Farm Butchery Ltd | Stratford-Upon-Avon | 2015 |
| Paddock Farm Dogs Ltd | Cambridge, | 2020 |
| Paddock Hedge Laying and Tree Care Limited | Loughborough | 2023 |
| Paddy's Point Shellfish Ltd | Clough | 2006 |
| Paddys Paws Ealing Ltd | Brentford | 2023 |
| Padfield & Partners Limited | Stratton-On-The-Fosse | 2023 |
| Padfield (Brownings) Limited | Epping | 1977 |
| Padfield (Hayleys) Limited | Epping Upland | 1959 |
| Padiham & District Angling Society Limited | Burnley | 2006 |
| Padog Enterprises Limited | Holyhead | 2014 |
| Padog Farms Limited | Conwy | 2007 |
| Padworth Trout Farm Limited | Hampshire | 1995 |
| PAF Agri + Labour Services Ltd | Inverurie | 2025 |
| Page Farming Limited | Bingham | 2023 |
| Pagepost Limited | Norfolk | 1997 |
| Pages Farm Cattery Ltd | Elstree | 2021 |
| Pages Stud Farm Limited | Hertfordshire | 2003 |
| Paiges Equine Services Ltd | Gravesend | 2024 |
| Paignton Marine Ltd | Paignton | 2019 |
| Paignton Mushrooms Ltd | Torquay | 2021 |
| Painsbridge Coombe Farming Limited | Whitchurch-On-Thames | 2020 |
| Painswick Property Management Limited | Stroud | 2023 |
| Paintbox Consultancy Limited | Saxmundham | 2008 |
| PAK Agri Farm Limited | Surrey | 2023 |
| Pakenham Estates Limited | Bury St Edmunds | 1966 |
| Pakistan Procurement Ltd | Leyland | 2023 |
| PAL Dog Walking Pet Minding Limited | Dumfries | 2025 |