| Otley Riverside Limited | Real estate | 2020 |
| OUR Future Care Limited | Health & social care | 2026 |
| Ourika Ltd | Information & communication | 2020 |
| Overland Cascade Ltd | Real estate | 2025 |
| Ovidiu Barcan Limited | Administrative & support | 2021 |
| Oxford Analytics and Data Services Ltd | Education | 2013 |
| Oxour Capital Limited | Wholesale & retail | 2020 |
| Ozone Capital Management Ltd | Real estate | 2019 |
| P & R Properties London Ltd | Real estate | 2018 |
| P & S Consultants Ltd | Information & communication | 1986 |
| P a Pharma Ltd | Wholesale & retail | 2024 |
| P F Plant Sales Limited | Construction | 2015 |
| P R Artistry Limited | Professional & scientific | 1998 |
| P Vaid Management Ltd | Financial services | 2012 |
| P&B SP Limited | Real estate | 2021 |
| P&Gjl Limited | Education | 2025 |
| P&Gss Limited | Education | 2020 |
| P. Flannery Plant Hire (Oval) Limited | Construction | 1972 |
| P.G. Land Projects Ltd | Financial services | 2023 |
| P.J. Ford & Associates Limited | Professional & scientific | 1989 |
| P13-FTX Limited | Construction | 2025 |
| P26 Construction Ltd | Construction | 2016 |
| Paar Ventures Ltd | Information & communication | 2026 |
| PAD Consultants LP | | 2026 |
| Paddington Corporation Limited | Real estate | 2009 |
| Paddon Properties Limited | Real estate | 2015 |
| Padmavti Homes Ltd | Real estate | 2024 |
| Paint Fiction Ltd | Construction | 2021 |
| Paladin Probate Services Limited | Professional & scientific | 2018 |
| Palmaya Ltd | Wholesale & retail | 2023 |
| Palmeria Freehold Property Ltd | Real estate | 2017 |
| Panache Medi Spa Limited | Other services | 2014 |
| Panache PR Limited | Professional & scientific | 2007 |
| Pandora Real Estate Ltd | Real estate | 2025 |
| Pankaj Foundation | Administrative & support | 2025 |
| Pannard Properties (Hale) Limited | Real estate | 2005 |
| Papercraft Disposables Limited | Wholesale & retail | 1990 |
| PAR 3 Consulting Limited | Professional & scientific | 2025 |
| Parad (UK) Limited | Wholesale & retail | 2002 |
| Paragon Cleaning Company Limited | Administrative & support | 1999 |
| Paran Properties Limited | Real estate | 2022 |
| Parasmani Investments Limited | Real estate | 2020 |
| Parasmani Solutions Limited | Information & communication | 2023 |
| Parikrma Foundation Trust Ltd | Education | 2025 |
| Parkinson 1 Limited | Professional & scientific | 2013 |
| Pars Investment Properties Ltd | Real estate | 2022 |
| Parsec Data Transactions Ltd | Information & communication | 2018 |
| Partitioning Solutions Limited | Construction | 2007 |
| PARVIN1982 Limited | Professional & scientific | 2024 |
| PAT Watt Electricals Limited | Construction | 2014 |
| Pathans of Watford Ltd | Hospitality | 2026 |
| Pathrise Residents Association Limited | Other services | 1984 |
| Pathways to Barakah Limited | Professional & scientific | 2026 |
| Patient Intelligence Panel Ltd | Professional & scientific | 2009 |
| Patsons Accountancy Limited | Professional & scientific | 2009 |
| Paul James Mulholland Ltd | Financial services | 2025 |
| Paul Capital Ltd | Real estate | 2019 |
| Paul Foskett Limited | Professional & scientific | 2022 |
| Paul Harris Developments Limited | Construction | 2016 |
| Paul LEE Limited | Professional & scientific | 2000 |
| Paul Manfredi Limited | Administrative & support | 2002 |
| Paul Reeves London Limited | Wholesale & retail | 2012 |
| Paul Strickland Scanner Centre | Health & social care | 1986 |
| Pauldon Developments Ltd | Real estate | 2004 |
| Payper Box Limited | Administrative & support | 2002 |
| PCV Properties Limited | Real estate | 2020 |
| Peaches Psychology Limited | Health & social care | 2013 |
| Peacock Blue Limited | Real estate | 2021 |
| Peak Interval Ltd | Information & communication | 2024 |
| Peak Line Investments Limited | Professional & scientific | 2024 |
| Peakstone Developments Ltd | Manufacturing | 2026 |
| Pear Electronics Limited | Extraterritorial | 2010 |
| Pear Tree Leisure (Consultancy) Limited | Other services | 2016 |
| Pearl Brows Limited | Other services | 2009 |
| Pearl Homes Ltd | Real estate | 2019 |
| Pearl Properties Limited | Real estate | 1993 |
| Pebblecourt Limited | Households | 1996 |
| Pedros Capital Limited | Real estate | 2015 |
| Pele Khione Limited | Professional & scientific | 2021 |
| Penguin Technologies Ltd | Information & communication | 2026 |
| Pennink Productions Limited | Information & communication | 2003 |
| Pentafresh Limited | Wholesale & retail | 2023 |
| Peravita Limited | Wholesale & retail | 2026 |
| Peregrine & Black Capital Management Ltd | Financial services | 2013 |
| Perin Holdings Limited | Real estate | 2021 |
| Period Restoration (Hampshire) Ltd | Construction | 2012 |
| Persika Consultancy Limited | Professional & scientific | 2005 |
| Personal Data Compliance Limited | Professional & scientific | 2019 |
| Personalised Prints Limited | Manufacturing | 2018 |
| Pestle and Mortar Limited | Real estate | 2017 |
| Petering OUT Limited | Professional & scientific | 2010 |
| PH Energy Associates Limited | Professional & scientific | 2017 |
| Pharos 8 Limited | Professional & scientific | 1997 |
| Phenix Cleaning and Maintenance Ltd | Administrative & support | 2023 |
| Philbin Bros Limited | Construction | 2018 |
| Phiri Chifundo Care Ltd | Health & social care | 2025 |
| Phoenixeven Services Ltd | Information & communication | 2024 |
| Phonogenic Music Publishing Ltd | Arts & recreation | 2011 |
| PI Team Ltd | Real estate | 2019 |
| Picasso Estates Ltd | Real estate | 2024 |