| PFS Haulage Limited | Transport & logistics | 2017 |
| PG Glazing Limited | Administrative & support | 2008 |
| PG Holdings Ltd | Wholesale & retail | 2019 |
| PG Plant and Machinery Sales Ltd | Wholesale & retail | 2020 |
| PG Site Services (S.E.) Limited | Administrative & support | 2013 |
| PG Windscreens Ltd | Construction | 2022 |
| Pharma Aesthetics Academy Ltd | Education | 2021 |
| Pharma Aesthetics London Limited | Health & social care | 2020 |
| PHARMACY4LIFE Ltd | Wholesale & retail | 2014 |
| Pharmaseen Ltd | Health & social care | 2024 |
| Pharmnet Limited | Wholesale & retail | 2025 |
| Philbek Services Ltd | Information & communication | 2011 |
| Philip Services Ltd | Professional & scientific | 2021 |
| Phoenix Chauffeurs Limited | Transport & logistics | 2010 |
| Phoenix Compaction Systems Limited | Wholesale & retail | 1991 |
| Phoenix Equipment Rentals Limited | Administrative & support | 1997 |
| Phoenix Fire Protection and Maintenance Limited | Construction | 2023 |
| Piacelo Technologies Ltd | Information & communication | 2025 |
| Pid's Plumbing & Heating Ltd | Construction | 2018 |
| Pier London Limited | Water & waste | 2024 |
| Pilates Social Limited | Arts & recreation | 2016 |
| Pinglab Ltd | Health & social care | 2023 |
| Pink Network Ltd | Wholesale & retail | 2026 |
| Pinnacle Exteriors Ltd | Construction | 2016 |
| Pinnacle Investment Properties Limited | Real estate | 2006 |
| Pinrose Consultancy Ltd | Health & social care | 2021 |
| Pitta 4U Ltd | Hospitality | 2019 |
| Pity Cleaning Limited | Other services | 2010 |
| Pixel Rock Ltd | Wholesale & retail | 2025 |
| Pixeladdictx Ltd | Professional & scientific | 2024 |
| Pizza Gogo Ltd | Manufacturing | 1995 |
| PJ Grantham Ltd | Hospitality | 2020 |
| Pj's Pupils - Tutoring UK Ltd | Education | 2025 |
| Plant Systems Solutions Ltd | Professional & scientific | 2018 |
| Platinum PAY Limited | Professional & scientific | 2016 |
| Playcam Limited | Information & communication | 2017 |
| Plumbers on Tapp Ltd | Construction | 2026 |
| Plusqo Ltd | Administrative & support | 2016 |
| PM Facade Experts Limited | Construction | 2019 |
| Podlogic Ltd | Information & communication | 2026 |
| Point 13 Kitchen Ltd | Hospitality | 2026 |
| Poppy Carpentry & Construction Ltd | Construction | 2026 |
| Portable LOO and Tool Hire Limited | Administrative & support | 2025 |
| Positive Shipping Ltd | Transport & logistics | 2013 |
| Postpro Films Ltd | Information & communication | 2024 |
| Poth Hille & Company Trustees Limited | Professional & scientific | 2026 |
| Poth Hille & Company,Limited | Manufacturing | 1904 |
| Powell Rail Planning Ltd | Construction | 2026 |
| Power Engines Ltd | Transport & logistics | 2018 |
| Power Protect Group Limited | Public administration | 2017 |
| Powerful Diverse Executice Search Ltd | Administrative & support | 2019 |
| PR Visa Specialists Ltd | Administrative & support | 2024 |
| Prabhjot Construction Limited | Construction | 2019 |
| Praise Chapel Rainham Limited | Education | 2023 |
| Precelja Limited | Extraterritorial | 2021 |
| Preci Property Ltd | Construction | 2024 |
| Precious Excellent Care Ltd | Health & social care | 2019 |
| Precious Playgroup Ltd | Health & social care | 2026 |
| Precious Pooches Ltd | Other services | 2011 |
| Precise Radiance Ltd | Other services | 2025 |
| Precision Property Care Limited | Households | 2026 |
| Premium UK Group Limited | Financial services | 2025 |
| Prescott Kettles Ltd | Wholesale & retail | 2025 |
| Prestige Construction 4U Limited | Construction | 2021 |
| Prestige Educare Ltd | Education | 2023 |
| Prestige Properties London Limited | Real estate | 2025 |
| Prestige Tiling Co. Ltd | Construction | 2021 |
| Prestwood Community Housing CIC | Health & social care | 2023 |
| Pridel UK Limited | Transport & logistics | 2017 |
| Prime Bulk Ltd | Wholesale & retail | 2025 |
| Prime Heating Ltd | Construction | 2012 |
| Prime MOT Centre Ltd | Wholesale & retail | 2025 |
| Prime Property Maintenance (Kent) Ltd | Construction | 2025 |
| Prime Tiles Group Ltd | Wholesale & retail | 2020 |
| Primex Solutions Limited | Real estate | 2024 |
| Priority Land & Water Solutions Ltd | Administrative & support | 2023 |
| Priority Trade UK Ltd | Wholesale & retail | 2026 |
| Prism Cyber Limited | Information & communication | 2020 |
| Prism Edge Ltd | Professional & scientific | 2016 |
| Prisma Facilities Ltd | Hospitality | 2017 |
| Pristine Spaces Group Limited | Transport & logistics | 2024 |
| Pristine Valeting Ltd | Wholesale & retail | 2022 |
| Privatehirencs Ltd | Transport & logistics | 2024 |
| Privatevision Ltd | Construction | 2026 |
| Priyangon Limited | Real estate | 2022 |
| Prized Medical Services Ltd. | Professional & scientific | 2010 |
| Prjkt-X Ltd | Information & communication | 2023 |
| Pro Car Hire Essex Limited | Administrative & support | 2026 |
| Pro Plumbers 2000 Ltd | Construction | 2019 |
| Pro Skill Staff Ltd | Financial services | 2024 |
| Pro Vision Property Solutions Ltd | Construction | 2021 |
| Pro Wash & Tyres Ltd | Wholesale & retail | 2026 |
| Procleansolutions Ltd | Manufacturing | 2026 |
| Profitmaster Systems Limited | Information & communication | 1994 |
| Project 74 Limited | Information & communication | 2014 |
| Project Hermes International Ltd | Health & social care | 2010 |
| Project Solid Sky Ltd | Construction | 2023 |
| Promech Holdings Limited | Financial services | 2019 |
| Promech Services Limited | Construction | 1991 |
| Promise Education and Recruitment Agency Limited | Education | 2018 |