| P & N Homes Limited | Construction | 2000 |
| P & P Builders Limited | Construction | 2004 |
| P & P IT Limited | Information & communication | 2018 |
| P and B Properties Cardiff Ltd | Real estate | 2021 |
| P Armitage Consulting Ltd | Information & communication | 2012 |
| P Beverage Company Limited | Wholesale & retail | 2020 |
| P COX Ltd | Financial services | 2017 |
| P Danby Limited | Other services | 2019 |
| P H E Services (NW) Limited | Construction | 2002 |
| P Harwood Contractors Limited | Construction | 2023 |
| P J Edwards Engineering Services Ltd. | Construction | 2008 |
| P J Morgan Management Limited | Administrative & support | 1990 |
| P J Plant Hire Ltd | Administrative & support | 2011 |
| P J Ward Ltd | Professional & scientific | 2012 |
| P L Phelps Services Limited | Information & communication | 2014 |
| P L S Children's Services Limited | Health & social care | 2010 |
| P M W Enterprises Limited | Wholesale & retail | 1998 |
| P Merison & Sons Ltd | Financial services | 2024 |
| P Ross & Co Limited | Professional & scientific | 2007 |
| P S & J P Evans Ltd | Hospitality | 2019 |
| P Speirs Electrical Limited | Construction | 2009 |
| P Timila Consulting Limited | Professional & scientific | 2025 |
| P W Lifts Ltd | Manufacturing | 2010 |
| P W Millar Golf Limited | Arts & recreation | 1998 |
| P&B Construction Ltd | Construction | 2013 |
| P&Co Fastrack Ltd. | Transport & logistics | 2013 |
| P&D Consulting Ltd | Administrative & support | 2011 |
| P&D Removals Limited | Transport & logistics | 2002 |
| P&E Engineer Maintenance Ltd | Manufacturing | 2019 |
| P&K Financial Solutions Limited | Financial services | 2010 |
| P&P Timber Ltd | Wholesale & retail | 2013 |
| P&P Trading Limited | Wholesale & retail | 2022 |
| P&R Estates Limited | Real estate | 2015 |
| P&S Recycling Services Ltd. | Wholesale & retail | 2013 |
| P-Metals Limited | Water & waste | 2022 |
| P. and R. Services (1983) Limited | Real estate | 1983 |
| P. G. K. Motors Limited | Wholesale & retail | 2017 |
| P. Shield Ltd | Wholesale & retail | 2026 |
| P.A.T. Enterprises Limited | Real estate | 1983 |
| P.Bojarski Rail General Groundworks Ltd | Construction | 2016 |
| P.D.M. Commercial Properties Limited | Real estate | 1995 |
| P.E. Technologies Ltd | Information & communication | 2022 |
| P.G Aquacultures Ltd | Agriculture & fishing | 2006 |
| P.I.Underwood and Son,Limited | Manufacturing | 1962 |
| P.O,W Ossett Ltd | Hospitality | 2025 |
| P.Osiadly Ltd | Transport & logistics | 2014 |
| P.R.N. Capital Limited | Real estate | 2016 |
| P.R.N. Construction Ltd | Construction | 2017 |
| P.S.C. Promo Services & Communications Ltd | Professional & scientific | 2018 |
| P.S.M.G Consulting Ltd | Other services | 2022 |
| P.S.P. Tech Solutions Ltd | Information & communication | 2026 |
| P.T.P.D.N Ltd | Transport & logistics | 2015 |
| P2A | Other services | 2018 |
| P2B Solutions Limited | Information & communication | 2025 |
| P3 Labs Ltd | Manufacturing | 2026 |
| P3RU Retail Ltd | Wholesale & retail | 2026 |
| P4B Law Limited | Professional & scientific | 2006 |
| P4C Properties Limited | Construction | 2018 |
| P4DX Limited | Professional & scientific | 2025 |
| P5 AI Consulting Ltd | Information & communication | 2026 |
| P7 Limited | Administrative & support | 2019 |
| PA Maintenance Ltd | Other services | 2020 |
| PA Promotions Limited | Administrative & support | 2002 |
| PA Thomas Property Ltd | Real estate | 2024 |
| PA22FITNESS Ltd | Arts & recreation | 2021 |
| PA6 Ltd | Real estate | 2017 |
| Paac Trading Limited | Transport & logistics | 2003 |
| Pablo Star Limited | Information & communication | 2003 |
| Pabrvh Mart Ltd | Wholesale & retail | 2025 |
| Pace Fitness Cardiff Ltd | Arts & recreation | 2010 |
| Pace PAY Payroll Ltd | Administrative & support | 2021 |
| Paceship Ltd | Wholesale & retail | 2025 |
| Pacevicius Invest Limited | Extraterritorial | 2025 |
| Pachage 1 ST1K Ltd | Other services | 2025 |
| Pacheri Logistics Limited | Transport & logistics | 2025 |
| Pachuca Holdings Limited | Professional & scientific | 2012 |
| Pacific Brothers Security Solutions Ltd | Real estate | 2025 |
| Pacific Business Park Management Group Limited | Real estate | 2015 |
| Pacific Heritage Premium Garment Trading Limited | Wholesale & retail | 2026 |
| Pacific Ocean Co., Ltd. | Extraterritorial | 2019 |
| Pacific PR Ltd | Professional & scientific | 2017 |
| Pacific Projects Investment Limited | Professional & scientific | 2004 |
| Pacific Trade Ventures (UK) Limited | Professional & scientific | 2005 |
| Pacific Venture Capital Ltd | Professional & scientific | 2025 |
| Pacifico Estates Ltd | Real estate | 2025 |
| Pacifico Ltd. | Construction | 2004 |
| Pacificways Limited | Administrative & support | 2017 |
| Pack a Punched Ltd | Hospitality | 2020 |
| Pack Housing Limited | Real estate | 2024 |
| PACK2GO Travel Ltd | Administrative & support | 2015 |
| Packaging & Envelopes Ltd | Wholesale & retail | 2025 |
| Pactiv (Films) Limited | Professional & scientific | 1970 |
| Pada Consulting Ltd | Professional & scientific | 2025 |
| Padelspeed Ltd | Wholesale & retail | 2024 |
| Padfield West Limited | Extraterritorial | 2013 |
| Padma Consulting Limited | Extraterritorial | 2016 |
| Padova Global Ltd | Wholesale & retail | 2025 |
| Paduri Media Limited | Information & communication | 2025 |
| PAE Management Solutions Limited | Professional & scientific | 2014 |
| Paediatric Gastroenterology Ltd | Health & social care | 2019 |