| Pooch Therapy South Ltd | Arts & recreation | 2026 |
| Pool Enclosures Limited | Construction | 2018 |
| Poppy Fields (Cholsey) Flats Management Company Limited | Households | 2022 |
| Poppy Fields (Cholsey) Management Company Limited | Households | 2022 |
| Poppy View (Saffron Walden) Management Company Limited | Households | 2020 |
| Porterhouse Recruitment Limited | Administrative & support | 2017 |
| Portfolio Consultancy Limited | Professional & scientific | 2003 |
| Porthgwari (Penzance) Management Company Limited | Households | 2018 |
| Portofino (Hemel Hempstead) Limited | Hospitality | 2010 |
| Pose Perfect Limited | Other services | 2008 |
| Poseidon Groundworks Ltd | Construction | 2025 |
| Positiva Publishing Ltd | Wholesale & retail | 2020 |
| Positive Impact Management Consultancy Limited | Professional & scientific | 2022 |
| Positive Story Productions Ltd | Arts & recreation | 2017 |
| Possible Stars Healthcare Ltd | Administrative & support | 2022 |
| Potential Difference (Electrical) Ltd | Arts & recreation | 2022 |
| Potential Squared International Limited | Professional & scientific | 2001 |
| Potter Films Ltd | Information & communication | 2022 |
| Potters Bar Theatre School LLP | | 2024 |
| Potton Brickwork Ltd | Construction | 2020 |
| Powersync Electrical Ltd | Construction | 2025 |
| Powr Capital Limited | Energy | 2014 |
| Poynders Properties Limited | Real estate | 2017 |
| Ppfdoctor Ltd | Wholesale & retail | 2024 |
| PR Hair Ltd | Wholesale & retail | 2017 |
| Pranaflow Limited | Financial services | 2015 |
| Pravtech Ltd | Information & communication | 2016 |
| Praxia Consultancy Ltd | Information & communication | 2020 |
| Praxis International Ltd | Wholesale & retail | 2020 |
| Praxis Makes Perfect Limited | Professional & scientific | 2021 |
| Precision Contracting Limited | Administrative & support | 2016 |
| Premalata Limited | Professional & scientific | 2025 |
| Premery Ltd | Construction | 2022 |
| Premfix Interiors (London) Ltd | Construction | 2018 |
| Premier Carpet and Upholstery Cleaning Ltd | Administrative & support | 2025 |
| Premier Medica Ltd. | Health & social care | 2018 |
| Premier Plus Stationery Ltd | Wholesale & retail | 2010 |
| Premier Property Lets Ltd | Real estate | 2023 |
| Premier Security Systems UK Ltd | Administrative & support | 2008 |
| Premier Service Limited | Manufacturing | 2010 |
| Premium Clean Limited | Other services | 2009 |
| Premium CSS Ltd | Transport & logistics | 2026 |
| Premium Drylining Services Ltd | Construction | 2022 |
| Presence Interiors Limited | Construction | 2009 |
| Presentation Technologies Limited | Other services | 2019 |
| Pressure Pros (Herts) Ltd | Administrative & support | 2024 |
| Prestige Assets Investments Ltd | Real estate | 2024 |
| Prestige Audio Ltd | Administrative & support | 1997 |
| Prestige Decorating Services Limited | Construction | 2007 |
| Prestige Driveways and Roofing Ltd | Construction | 2026 |
| Prestige Equine Search Ltd | Agriculture & fishing | 2022 |
| Prestige Laundry Services Ltd | Other services | 2003 |
| Prestige Property Development & Trading Limited | Construction | 2011 |
| Prestige Vehicle Glass Limited | Wholesale & retail | 2023 |
| PRESTIGE1 Systems Ltd | Administrative & support | 2020 |
| Preston Danish Limited | Wholesale & retail | 2018 |
| Prestwood Modern and Classic Ltd | Wholesale & retail | 2022 |
| Price Support Services Limited | Administrative & support | 2007 |
| Primario Consulting Ltd | Administrative & support | 2022 |
| Primary Planning Solutions Ltd | Professional & scientific | 2022 |
| Prime Booth Ltd | Information & communication | 2025 |
| Prime Clean HQ Ltd | Administrative & support | 2025 |
| Prime Cloud Kitchen Ltd | Hospitality | 2026 |
| Prime Next Level Ltd | Wholesale & retail | 2020 |
| Prime Plastering Herts Ltd | Construction | 2025 |
| Prime Steel Services Limited | Construction | 2022 |
| Prime Superstore Limited | Wholesale & retail | 2017 |
| Prime Trust Construction Ltd | Construction | 2025 |
| Primfort Ltd | Administrative & support | 2024 |
| Primrose Development and Construction Ltd | Construction | 2005 |
| Princess Products Limited | Professional & scientific | 1939 |
| Princeton Estates Limited | Construction | 2004 |
| Principal ECS Holdings Limited | Professional & scientific | 2019 |
| Principal ECS Ltd | Professional & scientific | 2012 |
| Principal ECS Property Limited | Real estate | 2019 |
| Printercare Ltd | Other services | 2019 |
| Priority Needs Ltd | Wholesale & retail | 2023 |
| Priors Court Management Company (Monkmoor) Limited | Households | 2005 |
| Priors Farm Ltd | Agriculture & fishing | 2012 |
| Priory Fields (Pontefract) Management Company Limited | Households | 2014 |
| Priory Fields (Wells) Management Company Limited | Households | 2018 |
| Priory Gate Mill Road Hertford Management Company Limited | Households | 2015 |
| Prisha Ecommerce Limited | Wholesale & retail | 2020 |
| Prittlebrook (Southend) Management Company Limited | Households | 2015 |
| Prized Limited | Wholesale & retail | 2024 |
| Prized Places Ltd | Real estate | 2021 |
| Prizm Group Ltd | Information & communication | 2017 |
| Prmb Ltd | Real estate | 2019 |
| Pro Catene Construct Ltd | Construction | 2025 |
| Pro GSM Ltd | Wholesale & retail | 2022 |
| Pro Prep Meals Ltd | Manufacturing | 2020 |
| Pro Tile & Stone Limited | Construction | 2025 |
| Pro-Dog Limited | Professional & scientific | 2013 |
| Pro-Heat (GAS Services) Limited | Construction | 2004 |
| Pro-Mapp Limited | Information & communication | 2016 |
| Proactive Central Limited | Financial services | 2022 |
| Proactive Holdings Limited | Financial services | 2022 |
| Proactive UK Limited | Wholesale & retail | 1998 |
| Proana Property Ltd | Construction | 2023 |
| Probitts Accountants Ltd | Professional & scientific | 2021 |