| P1 UK Ltd | Construction | 2002 |
| P2 Logistics Ltd | Professional & scientific | 2011 |
| P2M Asset Management Ltd | Financial services | 2007 |
| P2M Lettings Ltd | Real estate | 1996 |
| P2MD Property Services Limited | Real estate | 2024 |
| P5HOMES Ltd | Real estate | 2023 |
| P8 Property Ltd | Real estate | 2022 |
| PA Coachworks Limited | Wholesale & retail | 2003 |
| PA Ideas Limited | Information & communication | 2024 |
| Paarvik Realtors Ltd | Administrative & support | 2019 |
| Pacehigh Limited | Construction | 1990 |
| Pacific Pharma UK Limited | Wholesale & retail | 2016 |
| Pacira Limited | Professional & scientific | 2007 |
| Pack Performance Apparel Ltd | Wholesale & retail | 2025 |
| Packman Property Ltd | Real estate | 2017 |
| PAD Ascot Ltd | Construction | 2009 |
| Paddington Property Services Limited | Real estate | 1996 |
| Paddy Logistic Ltd | Transport & logistics | 2025 |
| Padel Centric Limited | Construction | 2025 |
| Padma Invest LP | | 2017 |
| Padmar Limited | Administrative & support | 2016 |
| Padoca RG Ltd | Hospitality | 2025 |
| Pagoda Advisory Ltd | Professional & scientific | 2026 |
| Paint Life UK Ltd | Construction | 2024 |
| Paints-R-Us.Com Limited | Professional & scientific | 2000 |
| Pairoo Limited | Information & communication | 2018 |
| Paksoftware Services Limited | Information & communication | 2004 |
| PAL Realty Ltd | Real estate | 2022 |
| PAL Telecom Limited | Financial services | 2001 |
| PAL UK Holdings Ltd | Real estate | 2024 |
| Palace Gate Mansions Limited | Administrative & support | 2005 |
| Palace Gate Trading Limited | Financial services | 2013 |
| Palacewise Ltd | Real estate | 2022 |
| Paladino Property Limited | Real estate | 2021 |
| Palandro International LP | | 2017 |
| Palate Limited | Wholesale & retail | 2019 |
| Pale Blue DOT Ltd | Professional & scientific | 2015 |
| Pale Fire Software Limited | Information & communication | 2018 |
| Pall Mall Business Services Limited | Professional & scientific | 2016 |
| Pallada Limited | Wholesale & retail | 2006 |
| Palm Court (Palmerston Road) Property Management Company Limited | Households | 1963 |
| Palm Studios Ltd | Wholesale & retail | 2021 |
| Palmers G Limited | Hospitality | 2026 |
| Palores Ltd | Professional & scientific | 2012 |
| Palua.Ai Ltd | Manufacturing | 2021 |
| Panache Handicraft Ltd | Wholesale & retail | 2014 |
| Panache Property Management Limited | Real estate | 2024 |
| Panache Realty Ltd | Real estate | 2022 |
| Panaco Ltd | Information & communication | 2020 |
| Panamel Ltd | Wholesale & retail | 2025 |
| Panda Inn Takeaway Limited | Hospitality | 2019 |
| Panda IT Limited | Information & communication | 2015 |
| Pandamonium Pictures Limited | Information & communication | 2025 |
| Panepan Ltd | Manufacturing | 2023 |
| Pangean Collective Ltd | Professional & scientific | 2026 |
| Pankhaniya Services Limited | Professional & scientific | 2012 |
| Panoptic Profiles Limited | Manufacturing | 2016 |
| Panormik Invest LLP | | 2015 |
| Panstar Ltd | Professional & scientific | 2009 |
| Pantera Consulting Limited | Information & communication | 2017 |
| Pantheon Digital Ltd | Information & communication | 2025 |
| Panther 1919 Limited | Professional & scientific | 1997 |
| Panthera Capital Group Ltd | Financial services | 2026 |
| Panthera Consultancy Limited | Professional & scientific | 2023 |
| Panthera FX Limited | Professional & scientific | 2023 |
| Panthera Global Investment Ltd | Professional & scientific | 2026 |
| Papa Charlie Properties Limited | Real estate | 2017 |
| Paper Praxis Limited | Manufacturing | 2025 |
| Paper Sail Limited | Information & communication | 2018 |
| Papi Lima Ltd | Wholesale & retail | 2021 |
| Para L'Ocean Ltd | Wholesale & retail | 2021 |
| Paradigm Studio Limited | Professional & scientific | 2024 |
| Paradise Seafood Ltd | Wholesale & retail | 2010 |
| PARADOXMEDIA187 Ltd | Information & communication | 2024 |
| Paragon Diamonds Limited | Wholesale & retail | 2017 |
| Paragon Property Partners Ltd | Real estate | 2019 |
| Paragon Stone Design Limited | Manufacturing | 2022 |
| Paragrim Limited | Wholesale & retail | 2022 |
| Parallax Properties Limited | Real estate | 2016 |
| Param Group Ltd | Construction | 2026 |
| Paramount Education Services Ltd | Education | 2022 |
| Parcell and Clayford Homes Ltd | Construction | 2022 |
| Paree Enterprise Ltd | Wholesale & retail | 2025 |
| Parenta Care Ltd | Health & social care | 2019 |
| Parents & Co Limited | Health & social care | 2013 |
| Parhelia Events Ltd | Administrative & support | 2023 |
| Pari Property Management Ltd | Real estate | 2024 |
| Pariii Ltd | Wholesale & retail | 2024 |
| Paris Anne Ltd | Information & communication | 2024 |
| Pariwaar Ltd | Information & communication | 2007 |
| Park Avenue Development Ltd | Administrative & support | 2025 |
| Park Court (1991) Limited | Real estate | 1991 |
| Park House Residential Developments Limited | Administrative & support | 2015 |
| Park Lane Investments (U.K.) Limited | Real estate | 2024 |
| Park Line Cars Limited | Transport & logistics | 2026 |
| Park Property Advisory Ltd | Professional & scientific | 2023 |
| Park Road Residents (Watford) Limited | Real estate | 1972 |
| Park View (Berkhamsted) Management Co. Limited | Households | 1992 |
| Parker King Developments Limited | Construction | 2002 |
| Parkfield Property Ltd | Households | 2017 |