| P & V Lovie Ltd | Southport | 2018 |
| P & Y Well Services Limited | Lancaster | 1990 |
| P B Waste Ltd | Mansfield | 2006 |
| P C Tech (Peterhead) Ltd | Peterhead | 2012 |
| P Collier (Welding & Fabrication) Ltd | York | 2010 |
| P J Thory Aggregates Ltd | Cambs | 2004 |
| P Keenan Quarries Limited | Magherafelt | 2023 |
| P Keenan Roads Limited | Magherafelt | 2023 |
| P Mcparland Ltd | Newry | 2007 |
| P Paterson Ltd | Aberdeen | 2010 |
| P W Well Services Limited | Newark | 2003 |
| P W Well Test Limited | Newark | 2014 |
| P&G Eddy Plant Services Ltd | St Austell | 2016 |
| P&M Excavations Limited | Omagh | 2020 |
| P&S Synergy Ltd | Fakenham | 2025 |
| P.J. Lagan (Contracts) Limited | Belfast | 1969 |
| P.M.C. Surveys Limited | Doncaster | 2009 |
| PA Resources Overseas | Tiverton | 1997 |
| PAB Access Limited | Thornton-Cleveleys | 2013 |
| Pabe Limited | Aberdeen | 2009 |
| Pablo Blade Service Limited | East Cowes | 2024 |
| Pacifica Energy Limited | London | 2006 |
| PAD Risk Consulting Limited | Aberdeen | 2017 |
| Padstow Sea Sand Ltd | Wadebridge | 2025 |
| Paetoro Consulting UK Ltd | Loughton | 2016 |
| Painted Wolf Resources Limited | Hampton Wick | 2013 |
| Paladar Trading Ltd | London | 2019 |
| Palaeodate Limited | Middlesex | 2004 |
| Pallett Hill Sand & Gravel Co. Limited | Richmond | 1960 |
| Pamicon Minor Metals Limited | Enfield | 2002 |
| Pamoja Mining Resources Ltd | London | 2026 |
| PAN African Resources PLC | London | 2000 |
| PAN Technical Services Limited | Auchenblae | 1998 |
| Panacea ADK Limited | London | 2022 |
| Panacea Natural Resources Group Limited | London | 2024 |
| Panacea Natural Resources Limited | London | 2022 |
| Panacea Palmer River Limited | London | 2023 |
| Panaf Mining Ltd | Wallington | 2022 |
| Panalysis Limited | Grays | 2021 |
| Panam Minerals Ltd | Brighton | 2021 |
| Panda Resources Limited | London | 1987 |
| Pangaea Geochemistry Services Limited | Colwyn Bay | 2020 |
| Pangani Minerals UK Limited | London | 2025 |
| Panglobe Ltd. | Hounslow / Greater London | 2014 |
| Panoceanic Energy Limited | Weybridge | 1984 |
| Panoro 2B Limited | London | 2020 |
| Pant-Y-Gwlanod Quarry Limited | Chester | 2014 |
| Pantamu Investments Ltd | Hemel Hempstead | 2025 |
| Panthera Mali (UK) Limited | London | 2020 |
| Panthera Resources PLC | London | 2017 |
| Pantmawr Lime Company Limited | Mid Glam | 1935 |
| Paradigm Intervention Technologies Limited | Aberdeen | 2013 |
| Parchett Limited | Bishop'S Stortford | 1982 |
| Parex Solutions Ltd | East Kilbride | 2021 |
| Park Farm Quarry Ltd | London | 2018 |
| Park Lane Bathstone Limited | Kidlington | 2018 |
| Parker Design Limited | Halifax | 1998 |
| Parkinson Mechanical Services Ltd | Stockton | 2018 |
| Parkmead Renewable Energy Limited | Aberdeen | 2024 |
| Parr Rigging and Lifting Services Ltd | Lowestoft | 2025 |
| Parry's Premium Services Ltd | Dundee | 2017 |
| Parsberg Group Ltd | London | 2018 |
| Parsco International Limited | Milton Keynes | 2003 |
| Parstone Ltd | Caernarfon | 2020 |
| Particle Genesis Mining Group PLC | Bellshill | 2022 |
| Partnership for Levantine and Arab Cultural Exchange Ltd | Leven | 2019 |
| Parys Mountain Heritage Limited | Amlwch | 2006 |
| Parys Mountain Land Limited | Amlwch | 2006 |
| Parys Mountain Mines Limited | Anglesey | 1968 |
| PAT Munro (Alness) Limited | Alness | 1958 |
| PAT Munro Quarry Products Limited | Alness | 2021 |
| Patagonia Gold Limited | Bristol | 2000 |
| Patel Supplies & Services Limited | Hounslow | 2025 |
| Paterson & Cooke (UK) Ltd. | Truro | 2013 |
| Patersons of Greenoakhill Limited | | 1974 |
| Patrick Keenan Holdings | Magherafelt | 2025 |
| Paul Mcmonagle Mechanical Contracting Limited | London | 2018 |
| Paul OIL Limited | Gateshead | 2013 |
| Paul Parry Plant Ltd | Pontyclun | 2019 |
| Paul Sproat Electrical Limited | Thornton-Cleveleys | 2011 |
| PB International Sales Limited | Nottingham | 2013 |
| PB Mechanical Engineering Services Ltd | London | 2026 |
| PB Operations Solutions Ltd | Norwich | 2016 |
| PBC Conservation Limited | Downpatrick | 2020 |
| PBE Europe Limited | Maidenhead | 2012 |
| PBE P&S Infrastructure Europe Ltd | Maidenhead | 2026 |
| PC Geoscience Services Ltd | Cambridge | 2024 |
| PC Plant Training Ltd | London | 2021 |
| PCE Solutions Ltd | Fareham | 2022 |
| PCU Access Ltd | North Shields | 2020 |
| PCW Electrical (North East) Limited | Newcastle Upon Tyne | 2014 |
| PCW Metals Ltd | Farnham | 2015 |
| PCW Process Limited | Lowestoft | 2015 |
| PD Quality Services Limited | Doncaster | 2022 |
| PDC Fabrications Ltd | Sunderland | 2015 |
| PDG Engineering Services Ltd. | Dunblane | 2011 |
| PDI Limited | Manchester | 2017 |
| Pdmd Electrical Services Ltd | Dunfermline | 2005 |
| Pdpipelines Ltd | Bradford | 2025 |
| PDQ Scotland Ltd | Banchory | 2006 |