| Oxford Tree Surgeons Limited | Oxford | 2014 |
| Oxfordshire Estates Limited | Wimborne | 2013 |
| Oxfordshire GM Limited | Haverfordwest | 2015 |
| Oxfordshire Tree Services Ltd | Bicester | 2016 |
| Oxfordshires Agricultural Services Limited | Nr Abingdon | 2023 |
| Oxhill Alpacas Ltd | Warwick | 2021 |
| Oxleasows Enterprises Ltd | Stafford | 2021 |
| Oxleaze Farm Limited | Taunton | 2010 |
| Oxley Farming Limited | Hexham | 2022 |
| Oxney Forge Ltd | Essex | 2008 |
| Oxon Deer Limited | High Wycombe | 2018 |
| Oxpark Bloodstock UK Ltd | Newmarket | 2026 |
| Oxque Farms Limited | Richmond | 2016 |
| Oxslot Limited | Faringdon | 2001 |
| Oxted Mushrooms Limited | Oxted | 2024 |
| Oxton Contracting Limited | Southwell | 2012 |
| Oxton Farm | North Yorkshire | 1950 |
| Oxton Hill Alpacas Ltd | Mansfield | 2026 |
| Oxwillow Farming Company Ltd | King'S Lynn | 2025 |
| Oxygen Trust | Welwyn Garden City | 2010 |
| Oykel Farms Limited | Elgin | 1966 |
| OZ Equine Ltd | Godalming | 2020 |
| OZ Group Contracting Ltd | Heathfield | 2021 |
| OZ Pet Services Limited | Wallington | 2024 |
| OZ Trading & Logistics Limited | London | 2022 |
| OZ Trees Ltd | Heathfield | 2020 |
| Ozcraft Limited | Aldershot | 2010 |
| Ozone Adeline Limited | Lytham St. Annes | 2024 |
| OZP Limited | London | 2025 |
| Ozzie's Oinkers Ltd. | Norwich | 2019 |
| Ozziefields Limited | Gainsborough | 2014 |
| Ozzy Fishing Ltd | Buckie | 2021 |
| P & a Cholwill Limited | Bude | 2013 |
| P & a Croft (Farmers) Limited | Newark | 2003 |
| P & a Farming Limited | Stoke On Trent | 2017 |
| P & a King Brothers Agriculture Ltd | Barnoldswick | 2004 |
| P & a Love Limited | Sheerness | 1998 |
| P & B Hodgson and Sons Limited | Market Rasen | 2005 |
| P & D Allen (Farms) Limited | Hitchin | 2002 |
| P & D Breeding & Racing Stud Limited | West Bromwich | 2016 |
| P & D Findlay Ltd | Shillington | 2012 |
| P & E Farming Ltd | Newry | 2021 |
| P & E Harrison Limited | Wigton | 2006 |
| P & E Poultry Limited | Evesham | 2024 |
| P & E.J. Simpson Limited | Durham | 2002 |
| P & F Eggs Limited | Hereford | 2004 |
| P & F Ross Ltd | Stromness | 2017 |
| P & J Dennison Ltd | Dorchester | 2017 |
| P & J Dowson Limited | York | 2015 |
| P & J Howgego Limited | Goffs Oak | 2011 |
| P & J Kimpton Limited | Crewe | 2022 |
| P & JK Copley Limited | Melton Mowbray | 2012 |
| P & L Bannister Limited | Malton | 2010 |
| P & L Briggs Limited | Spalding | 2003 |
| P & L Farming Partnership Ltd | Retford | 2018 |
| P & L Hayes (Farms) Limited | March | 2013 |
| P & M Fishing Ltd | Ayrshire, Ayr | 2019 |
| P & M Kendra Market Weighton Limited | Market Weighton | 2002 |
| P & M Miller Limited | Evesham | 2001 |
| P & M Watson Limited | Forfar | 2012 |
| P & MF Fothergill Ltd | Thirsk | 2023 |
| P & P Aquatics Ltd | Waltham Abbey | 2021 |
| P & P Professional Farmers Limited | North Walsham | 1985 |
| P & R Burbage Limited | Northampton | 2007 |
| P & R Curnock Limited | Inkberrow | 1963 |
| P & R Farming Company | York | 2002 |
| P & R Robinson Limited | West Yorkshire | 2002 |
| P & R Wason Fishing Limited | Lyme Regis | 2017 |
| P & R Wright Farms Limited | Beccles | 2023 |
| P & S Farms Limited | Baldock | 1998 |
| P & S Watson Limited | Workington | 2006 |
| P & Y Farming Ltd | Yarlet | 2025 |
| P .W. Keen & SON Ltd | Wells | 2025 |
| P a Vizza Developments Limited | Glogue | 2004 |
| P a W Solutions Limited | Nuneaton | 2025 |
| P a Wright & Sons Limited | Atherstone | 1985 |
| P and J Dyer Limited | Yeovil | 2011 |
| P and J Stratton Investments Ltd | Swindon | 2015 |
| P B T Beal & Sons Limited | Driffield | 2016 |
| P Bartholomew Limited | Sittingbourne | 1995 |
| P C Channer Farms Limited | Winchester | 2011 |
| P C Perrett & Sons Limited | Sturminster Newton | 2009 |
| P Capps Farming Ltd | Boston | 2018 |
| P Collinson Ltd | Thirsk | 2024 |
| P D & B S Lawrence Limited | Cumbria | 2006 |
| P D Hook (Turkeys) Limited | Bampton | 2002 |
| P D Hutchinson Limited | Cumbria | 2002 |
| P D Johnson Farms Limited | Rochester | 2009 |
| P D M Produce (U.K.) Limited | Newport | 1996 |
| P E & M Capstick Ltd | Carlisle | 2015 |
| P E Marine Limited | Beverley | 2021 |
| P E Simmons & SON Limited | Hayle | 2003 |
| P E Walters and SON Limited | Aldworth | 2025 |
| P Findlay Contracting Limited | Hexham | 2024 |
| P G & R G Brown Limited | Staffordshire | 2007 |
| P G Bosworth Limited | Stapleford | 2016 |
| P G Kennels Limited | Doncaster | 2024 |
| P G Ratcliff Farms Limited | Essex | 2008 |
| P H Clark (High Burnham) Limited | Doncaster | 2017 |
| P H R Farms Limited | Faversham | 2010 |