| Progressive Arable Producers Limited | Londonderry | 2003 |
| Progressive Dairy Farming Ltd | Denbigh | 2020 |
| Progressive Dog Company Limited | Leicestershire | 2017 |
| Progressive Farmers Limited | Northwood | 1961 |
| Progressive Farming Company Ltd | Bodmin | 2019 |
| Progressive Farming Trust Limited | Cirencester | 1980 |
| Progressive Milk Producers Limited | Longhope | 1987 |
| Progressive Poultry Solutions Limited | Bridgwater | 2013 |
| Project - ESS Ltd | Inverurie | 2022 |
| Project Abundance UK C.I.C. | Huntingdon | 2023 |
| Project Apis CIC | Great Yarmouth | 2025 |
| Project Consultancy & Management Ltd | Oldham | 2004 |
| Project F Ltd | West Calder | 2020 |
| Project Harmless Biochar Ltd | Glasgow | 2024 |
| Project Kainos Limited | Chislehurst | 2025 |
| Project Manna CIC | Salisbury | 2019 |
| Project Multi Pest Limited | London | 2014 |
| Project Osiris CIC | Edinburgh | 2021 |
| Project Serenity Limited | Preston | 2019 |
| Project Vineyard Ltd | Cheddar | 2021 |
| Project Wataha Ltd | Wolverhampton | 2023 |
| Projects & Holdings Ltd | Bishop'S Stortford | 2026 |
| Prolife Foods UK Ltd | London | 2023 |
| Promar International Limited | Basingstoke | 1994 |
| Promise for Shelter Dogs CIC | Nottingham | 2024 |
| Promised Land Farm Limited | Lancashire | 2008 |
| Propa Paws K9 Fertility & Stud Services Ltd | Orpington | 2026 |
| Proper Local - Somerset Ltd | Taunton | 2025 |
| Property Sure Maintenance Limited | Enfield | 2025 |
| Propest Solutions Ltd | Redruth | 2017 |
| Proplan Services Limited | Westhill, Aberdeenshire | 2000 |
| Propnexis Capital Ltd | London | 2025 |
| Propork Ltd | Armagh | 1995 |
| Proprosperity Ltd | Swansea | 2024 |
| Proptek NZ Limited | Skipton | 2020 |
| Proroma Ltd | Horsham | 2026 |
| Prospace Consulting Ltd | Weymouth | 2003 |
| Prospect Bloodstock Ltd | Cambridge | 2022 |
| Prospect Farm Cornwall Limited | Camborne | 2007 |
| Prospect Stud Limited | Newmarket | 2017 |
| Prospect Top Wold Limited | Grimsby | 2021 |
| Prospect Woodland Services Ltd | Carlisle | 2022 |
| Prospects Marketing & Trading UK Ltd | Bristol | 2020 |
| Prospekt Farm | Faversham | 2006 |
| Prosper Properties Limited | Inkersall Bilsthorpe | 1997 |
| Prosperity Development for Global Trade Limited | Conyer | 2025 |
| Prosperity Equine Ltd | Glasgow | 2025 |
| Prospero Limited | Cumbria | 2005 |
| Prostrawsystems Ltd | Bury St. Edmunds | 2021 |
| Protato Ltd | Peterborough | 2014 |
| Protection K9 Limited | Cowdenbeath | 2025 |
| Proteus Pilotage Ltd | Middlesbrough | 2013 |
| Protocon Engineering Limited | Essex | 1972 |
| Proton Developments Limited | Wolverhampton | 1995 |
| Protree Limited | Glasgow | 2018 |
| Proturf Limited | Doncaster | 2001 |
| Proud to BE Stroud Ltd | Stroud | 2018 |
| Provan Contracting Limited | Cupar | 2026 |
| Provenance Plants Limited | Portsmouth | 2006 |
| Provettech Ltd | Whitchurch | 2017 |
| Provm Ltd | Southampton | 2019 |
| Prozen Limited | Forfar | 2022 |
| Prune Farm Ltd | Aylesbury | 2018 |
| PRW Farms | Castle Douglas | 2018 |
| Pryce & SON Ltd | Shrewsbury | 1996 |
| Pryor & Rickett Silviculture Ltd. | Carlisle | 1998 |
| Pryor Dairying Limited | Truro | 2013 |
| Pryor Farms Limited | Bishop'S Stortford | 2003 |
| Psiclone Limited | Calne | 2021 |
| PSK Equestrian Limited | Grimsby | 2023 |
| PSL Ground Works Ltd | Pontefract | 2026 |
| Psy.Co Enterprises Ltd | St. Columb | 2023 |
| PT Operations Ltd | Usk | 2025 |
| Pt&R Ltd | Faversham | 1964 |
| Ptarmigan & Eden AM Limited | Winchester | 2023 |
| Ptarmigan Trawlers Ltd | Annan | 2018 |
| PTC Farming Limited | Leyburn | 2017 |
| PTK Shellfish Limited | Buckie | 2013 |
| PTL Forestry Limited | Ilfracombe | 2020 |
| PTO Ltd | Manchester | 2021 |
| Ptolemy Equestrian Limited | Hertford | 2022 |
| Ptoroton Holdings Ltd | Elgin | 2018 |
| PTP Developments (Yorkshire) Limited | Worksop | 2020 |
| Ptree Surgery & Groundworks Limited | Fife | 2024 |
| PTS Utility Limited | Liverpool | 2023 |
| Pucknall Farms Limited | Winchester | 1984 |
| Puckshipton Farms Limited | Devizes | 2008 |
| Puddle END Farm Ltd | Witney | 2011 |
| Puddles CIC | Abergavenny | 2023 |
| Pudge Farms Ltd | Leominster | 2026 |
| Pudsey Ltd | Hythe | 2024 |
| Puffin Farms Limited | Haverfordwest | 2022 |
| PUI the Farmer Ltd | London | 2019 |
| Pukka Pups Limited | Orpington | 2026 |
| Pulcea Ltd | Edinburgh | 2015 |
| Pullar Fishing Limited | Montrose | 2018 |
| Pullar Plant Limited | Shipston-On-Stour | 2007 |
| Pullet Care Ltd | Telford | 2020 |
| Pulley Lane Limited | Market Drayton | 2022 |
| Pullum Ltd | London | 2024 |