| Platinum Property Services (UK) Limited | Construction | 2012 |
| Platt Educational and Consultancy Services LLP | | 2003 |
| Play Secure Limited | Other services | 2020 |
| Playup Ltd | Information & communication | 2019 |
| Plug JP Limited | Wholesale & retail | 2021 |
| Plumber Paul Limited | Construction | 2009 |
| Plumbworkshop Limited | Wholesale & retail | 2021 |
| Pluna Wellness Limited | Other services | 2026 |
| Plus Finance EOT Ltd | Professional & scientific | 2023 |
| Plus Finance Limited | Financial services | 2001 |
| Plus Finance LLP | | 2004 |
| Podo Plus Ltd | Wholesale & retail | 2026 |
| Point Clear Pictures Ltd | Information & communication | 2021 |
| Polar Engineering Services Limited | Manufacturing | 1994 |
| Polecult Ltd | Wholesale & retail | 2024 |
| Pollock Consulting Ltd | Professional & scientific | 1999 |
| Polygon Engineering Ltd | Professional & scientific | 2024 |
| Pooley Productions Ltd | Arts & recreation | 2024 |
| Portaminster Ltd | Professional & scientific | 2023 |
| Porters Consulting Ltd | Information & communication | 2012 |
| Portfolio Homecare Limited | Administrative & support | 2010 |
| Portland Imports Ltd | Wholesale & retail | 2022 |
| Postalaudits Limited | Professional & scientific | 2003 |
| Potter and Ford Ltd | Real estate | 2020 |
| Powerrod Limited | Construction | 1994 |
| PP Transport Ltd | Transport & logistics | 2026 |
| PPP Properties Ltd | Real estate | 2016 |
| Praddy Financial Consultancy Limited | Professional & scientific | 2012 |
| Pramit Technologies Limited | Information & communication | 2025 |
| Prathap Investments Ltd | Real estate | 2021 |
| Praxian Consulting Ltd. | Extraterritorial | 2013 |
| Precision Auto Tuning Ltd | Wholesale & retail | 2024 |
| Precision International Limited | Manufacturing | 1982 |
| Preina Property Solutions Ltd | Households | 2018 |
| Prestige Press (U.K.) Limited | Manufacturing | 1979 |
| Preston Infotech Limited | Information & communication | 2015 |
| Prime Dining Limited | Hospitality | 2026 |
| Prime Plumbing Solutions (Bucks) Ltd | Construction | 2024 |
| Primeplot Holdings Ltd | Real estate | 2025 |
| Prism Showers Limited | Extraterritorial | 2023 |
| Private Secretarial Management Services Limited | Administrative & support | 2022 |
| PRM Consultancy Ltd | Other services | 2019 |
| Pro-Active Property Services Buckinghamshire Limited | Administrative & support | 2019 |
| Pro-Servicing Limited | Administrative & support | 2006 |
| Proactive Approach Limited | Extraterritorial | 2026 |
| Probuilderss Limited | Construction | 2021 |
| Procon (London) Limited | Construction | 1994 |
| Procuremasters Limited | Administrative & support | 2015 |
| Professional Construction Design Services Limited | Professional & scientific | 2003 |
| Project Alliance Ltd | Professional & scientific | 2021 |
| Prop-Pro Limited | Real estate | 2014 |
| Propellor Ltd | Information & communication | 2012 |
| Property Avenue Ltd | Real estate | 2024 |
| Property Like a Pro Ltd | Professional & scientific | 2025 |
| Property Space Solutions Limited | Real estate | 2013 |
| Propertyam Ltd | Real estate | 2017 |
| Propulsion Marketing Limited | Professional & scientific | 2022 |
| Prospect Works Management Company Limited | Real estate | 2005 |
| PROSPERA365 Ltd | Professional & scientific | 2026 |
| PSD Global Ltd | Administrative & support | 2021 |
| PSD Property Holdings Ltd | Financial services | 2019 |
| Psycolibrary of Life Ltd | Professional & scientific | 2019 |
| Puffins AI Ltd | Information & communication | 2020 |
| Punjtan PAK Limited | Extraterritorial | 2024 |
| Puppy Dog Hotel Limited | Other services | 2011 |
| Pure Body FIX Ltd | Other services | 2019 |
| Purefitness Bucks Ltd | Other services | 2022 |
| Purley Creek Company Limited | Other services | 1984 |
| Purple Jigsaw Limited | Administrative & support | 2019 |
| Purple Rocket Limited | Information & communication | 2018 |
| Push Pull Ltd | Manufacturing | 2008 |
| QDD Limited | Construction | 2023 |
| QGC Ltd | Professional & scientific | 2024 |
| Qnovae Ltd | Wholesale & retail | 2021 |
| Quadriga Cyber Consulting Ltd | Information & communication | 1959 |
| Quainton Demolition & Construction Limited | Construction | 2023 |
| Quality Enterprise Ltd | Real estate | 2015 |
| Quality Wheels Limited | Wholesale & retail | 2025 |
| Qualityfit Solutions Ltd | Manufacturing | 2021 |
| Quantum Consultation Ltd | Professional & scientific | 2024 |
| Quantum REX Limited | Professional & scientific | 2018 |
| Quickbooks Consultants Limited | Professional & scientific | 2017 |
| Quiet Media Limited | Administrative & support | 2021 |
| Quill Chambers Limited | Professional & scientific | 2019 |
| Quinmore Limited | Wholesale & retail | 2015 |
| Quizstorm Ltd | Information & communication | 2009 |
| Qusto Co Ltd | Extraterritorial | 2013 |
| R & H Capital LLP | | 2004 |
| R & R Pilates Ltd | Arts & recreation | 2025 |
| R and T Ward Ltd | Real estate | 2020 |
| R English Properties Ltd | Real estate | 2025 |
| R Jefferis Limited | Real estate | 2017 |
| R Meates Consulting Ltd | Professional & scientific | 2021 |
| R Russell Brush Manufacturer Limited | Manufacturing | 2016 |
| R Yerby Psychology Limited | Education | 2016 |
| R. Benson Property Maintenance Limited | Construction | 2001 |
| R.G.F. Transport Limited | Transport & logistics | 2008 |
| R2R2025 CIC | Information & communication | 2025 |
| Raans Farm Management Limited | Households | 2015 |
| Radian Aerospace UK Ltd | Transport & logistics | 2024 |