| Payroll Cloudfusion Ltd | Information & communication | 2025 |
| PBA Consulting 81 Ltd | Professional & scientific | 2021 |
| PBA Sales Recruitment Limited | Administrative & support | 2015 |
| PC Health Consulting Ltd | Wholesale & retail | 2025 |
| PC Healthcare Group Ltd | Health & social care | 2024 |
| Pckl Consultancy Limited | Professional & scientific | 2025 |
| PDA Distribution Limited | Transport & logistics | 1994 |
| PDG Investments Ltd | Construction | 2015 |
| Pdjs Management Ltd | Administrative & support | 2019 |
| Pdjs Properties Limited | Real estate | 2022 |
| Peach Estates Limited | Real estate | 2008 |
| Peacock Film Finance Limited | Information & communication | 2010 |
| Pearl Executive Cars Ltd | Administrative & support | 2001 |
| Pearl Ortho Care Ltd | Health & social care | 2010 |
| Pearlyfield Properties Ltd | Real estate | 2026 |
| PEC Medicals Limited | Transport & logistics | 2015 |
| Peculiar Pictures Limited | Arts & recreation | 2002 |
| Pedram Rasti Asian Art Limited | Other services | 2017 |
| Peerbridge Limited | Construction | 1982 |
| Peeto Food Ltd | Hospitality | 2026 |
| Pelican Productions Ltd | Information & communication | 2018 |
| Pembroke (Hendon) Management Co. Limited | Households | 1989 |
| PEN Private Clients Limited | Financial services | 2024 |
| Pen-Telecom Limited | Information & communication | 2012 |
| Pencastle Farm Limited | Real estate | 2015 |
| Penkiln Burn Limited | Arts & recreation | 1995 |
| Penmere Properties Limited | Real estate | 2018 |
| Penshurst Court Limited | Real estate | 1996 |
| Penton Grant (Belmont) Ltd | Real estate | 2002 |
| Peony Ventures Limited | Construction | 2022 |
| Peppercorn Caterers Limited | Hospitality | 2016 |
| Peppercorn Investments (Residential) Limited | Real estate | 2023 |
| Peppercorn Investments Limited | Real estate | 2004 |
| Peppercorn Property Investments Limited | Construction | 1985 |
| Peptide Clinics Limited | Professional & scientific | 2026 |
| Peregrine Stone Ltd | Professional & scientific | 2025 |
| Perfectly Bronzed Ltd | Other services | 2023 |
| Perfectly Normal Theatre Ltd | Professional & scientific | 2025 |
| Perfitt Investments Limited | Real estate | 2022 |
| Performance Governance Solutions Limited | Professional & scientific | 2008 |
| Perfumwala Ltd | Wholesale & retail | 2024 |
| Pergamon Ltd | Wholesale & retail | 2009 |
| Perpedes Speed Ltd | Transport & logistics | 2025 |
| Perpetual Evolvement Limited | Information & communication | 2017 |
| Perpetual Property Innovations Limited | Construction | 2024 |
| Persona Clothing Limited | Wholesale & retail | 2020 |
| Personal Presents Limited | Wholesale & retail | 1995 |
| Perspective of Origin Ltd | Real estate | 2024 |
| Pertex Ltd | Hospitality | 2015 |
| Peter Bartels Consulting Ltd | Professional & scientific | 2018 |
| Peter Leung Design Ltd | Professional & scientific | 2014 |
| Peter Nash Specialist Cars Limited | Wholesale & retail | 2004 |
| Peterborough Garages Limited | Construction | 1980 |
| Petherton Business and Media Limited | Professional & scientific | 2011 |
| Petmeds Ltd | Wholesale & retail | 2025 |
| Petrouk Consultants Limited | Professional & scientific | 2011 |
| Pevonia UK Limited | Wholesale & retail | 2008 |
| PGL Estates Limited | Real estate | 2021 |
| PH Intelligence Limited | Professional & scientific | 2015 |
| PH Squared Investments Ltd | Real estate | 2020 |
| Pharmarov Consulting Ltd | Administrative & support | 2008 |
| Pharmchem Limited | Wholesale & retail | 1996 |
| Philips Enterprise Ltd | Professional & scientific | 2007 |
| Phoenix Payment Ltd | Financial services | 2018 |
| Phoenix Trinity Design and Build Limited | Construction | 2007 |
| Phonebase Limited | Information & communication | 1990 |
| Phonics Folk Limited | Education | 2025 |
| Phosphor Limited | Information & communication | 2006 |
| Photogiftworld Ltd | Professional & scientific | 2019 |
| Phygital Retail Limited | Professional & scientific | 2018 |
| Physio-Theraputics Ltd | Health & social care | 2013 |
| Piabode Properties Limited | Real estate | 2023 |
| Pickering Court, Granville Road (Management) Limited | Households | 1970 |
| PIE Construction Ltd | Real estate | 2022 |
| PIL Official Limited | Information & communication | 2011 |
| PIL Twin Limited | Information & communication | 2009 |
| Pilot Academy Ltd | Professional & scientific | 2007 |
| Pinder Livery Limited | Agriculture & fishing | 2024 |
| Pine Crest Finance Limited | Financial services | 2019 |
| Pinecone Technology Ltd | Information & communication | 2021 |
| Pineridge Investments Limited | Real estate | 1991 |
| Pineseed Limited | Professional & scientific | 2023 |
| Pinewood Asset Management Ltd | Financial services | 2023 |
| Pink Balloon Limited | Information & communication | 2004 |
| Pink Pest Control Company Limited | Administrative & support | 2018 |
| Pink Rose Property Limited | Real estate | 2020 |
| Pinkleaf Limited | Water & waste | 2007 |
| Pinksquare Ltd | Administrative & support | 2017 |
| Pinnacle Property Broker Ltd | Wholesale & retail | 2024 |
| Pinner Real Estate (Eastcote) Limited | Construction | 2018 |
| Pinner Real Estate Limited | Construction | 2022 |
| Pintube Ltd | Administrative & support | 2022 |
| Pioneer Bathrooms Ltd | Wholesale & retail | 2010 |
| PIP Estates Ltd | Real estate | 2020 |
| Pipers Properties Limited | Real estate | 2017 |
| Piranha Publishing Limited | Arts & recreation | 2017 |
| PIT Lane Autos Limited | Wholesale & retail | 2013 |
| Pitlane Accident Repair Centre (UK) Limited | Wholesale & retail | 2016 |
| Pitmore Residential LLP | | 2014 |
| Pivotal 14 Limited | Administrative & support | 2014 |