| PAT Hough Plant Services Ltd | Construction | 2022 |
| PAT KC Consulting Limited | Information & communication | 2015 |
| Patterson's Penguins Limited | Arts & recreation | 2003 |
| Paul M GAS Ltd | Construction | 2020 |
| Paul Manlow Ltd | Administrative & support | 2018 |
| Paul Mcgroarty Ltd | Transport & logistics | 2008 |
| Pavs Media Ltd | Transport & logistics | 2018 |
| Pawesome Sidekick Ltd | Extraterritorial | 2023 |
| Payeda Limited | Information & communication | 2020 |
| Payton & Co Real Estate Ltd | Real estate | 2023 |
| Payton Technology Ltd | Wholesale & retail | 2025 |
| Pazifico Limited | Wholesale & retail | 2021 |
| PC Consulting (London) Limited | Information & communication | 2007 |
| PC Wizards Onsite Limited | Extraterritorial | 2008 |
| PCN Constructors Ltd | Construction | 2025 |
| PCS Building Services Limited | Construction | 2011 |
| PD Quality Consulting Limited | Administrative & support | 2010 |
| PD543 Ltd | Information & communication | 2023 |
| PDK Security Ltd | Administrative & support | 2013 |
| Peace Within Company Limited | Hospitality | 2026 |
| Peachpearplum Catering Limited | Hospitality | 2011 |
| Peacock Scaffolding Ltd | Construction | 2018 |
| Peak 19 Limited | Professional & scientific | 2010 |
| Peak Properties London Ltd | Real estate | 2023 |
| Pearl H Services Ltd | Education | 2025 |
| Pearl Reside GM Ltd | Real estate | 2025 |
| Pearl's Parties Ltd | Arts & recreation | 2025 |
| Pearly Teeth Ltd | Health & social care | 2025 |
| Pecheli Ltd | Extraterritorial | 2015 |
| Pecla International Ltd | Professional & scientific | 2019 |
| Pegasus DCO Ltd | Information & communication | 2025 |
| Pegasus Stone Limited | Construction | 2023 |
| Pelican Group Developments Limited | Construction | 2021 |
| Pelican Group Holdings Ltd | Financial services | 2020 |
| Pelican Group Investments Limited | Real estate | 2021 |
| Pelkus Limited | Administrative & support | 2011 |
| Pembroke Electrical Services Ltd | Construction | 2020 |
| Pennwood Grange (Hazlemere) Management Company Limited | Households | 2025 |
| Pentagon Film Limited | Information & communication | 2024 |
| Pentima Ltd | Information & communication | 2014 |
| Penuel Hope Limited | Real estate | 2025 |
| Pera Catering Ltd | Hospitality | 2012 |
| Perf Studios Limited | Professional & scientific | 2025 |
| Perfect Look Ltd | Other services | 2021 |
| Perfect Look Properties Ltd | Real estate | 2026 |
| Performance Control Solutions Ltd | Administrative & support | 2025 |
| Performante Group Ltd | Wholesale & retail | 2018 |
| Perfume Oasis Limited | Wholesale & retail | 2020 |
| Perryworld Impex PVT Ltd | Wholesale & retail | 2020 |
| Personal Menu Ltd | Hospitality | 2019 |
| Pest Control RAF Serv Ltd | Administrative & support | 2024 |
| Pest Patrol London 24/7 Ltd | Administrative & support | 2025 |
| Pet Universe Ltd | Wholesale & retail | 2024 |
| Peter Lane Studios Ltd | Professional & scientific | 2022 |
| Peters Properties Limited | Real estate | 2019 |
| Petsun Trading Co., Limited | Wholesale & retail | 2021 |
| PF Vehicle Repairs Limited | Wholesale & retail | 2021 |
| PFH Markets Limited | Financial services | 2020 |
| PGG Interior Design Limited | Professional & scientific | 2023 |
| PGG SA Limited | Real estate | 2023 |
| PGG Sourcing Limited | Other services | 2023 |
| PH7 Software Ltd | Manufacturing | 2026 |
| Phanes Tech Limited | Information & communication | 2026 |
| Pharmedix Gold Health Limited | Public administration | 2017 |
| Pharmex Consulting Ltd | Administrative & support | 2015 |
| Phil Clark Consulting Ltd | Professional & scientific | 2026 |
| Phoenix Driveways Limited | Construction | 2025 |
| Phoenix GAS and Heating Ltd | Construction | 2017 |
| Phoenix Restomods Limited | Wholesale & retail | 2025 |
| Phoenix Service Providers Ltd | Construction | 2012 |
| Phoenixx Services Ltd | Administrative & support | 2023 |
| Phone Cloud London Limited | Wholesale & retail | 2023 |
| Photo ETC Ltd | Wholesale & retail | 2024 |
| Photoday Ltd | Professional & scientific | 2017 |
| Photonimage by Daran Limited | Professional & scientific | 2019 |
| PHP Plus Consultants Limited | Information & communication | 2018 |
| PHS Media Ltd | Arts & recreation | 2010 |
| Physio Care at Home Ltd | Other services | 2022 |
| PI9 Limited | Information & communication | 2013 |
| Pianoz.Com Limited | Wholesale & retail | 2026 |
| PIK Construction Ltd | Construction | 2025 |
| Pillar Ltd | Construction | 2017 |
| Pimello Properties Ltd | Real estate | 2021 |
| Pine Strippers Ltd | Construction | 2026 |
| Pinewood Treecare Limited | Agriculture & fishing | 2006 |
| Pinnacle Accountants Ltd | Administrative & support | 2015 |
| Pioneers Galaxy Limited | Information & communication | 2018 |
| Piping Stress Engineering Services Limited | Construction | 2008 |
| Piscape Ltd | Professional & scientific | 2019 |
| Pitslot Racing Limited | Arts & recreation | 2012 |
| Pivotal 68 Limited | Professional & scientific | 2022 |
| Pizza Ruislip Ltd | Hospitality | 2019 |
| PJB Law Limited | Professional & scientific | 2016 |
| PK Hodson Developments Ltd | Construction | 2025 |
| Plan Construction Ltd | Construction | 2020 |
| Planet Picks Ltd | Wholesale & retail | 2023 |
| Planet Property Investments Limited | Real estate | 2017 |
| Plant Consultants Ltd | Professional & scientific | 2020 |
| Plate Supply Limited | Wholesale & retail | 2023 |
| Platinum Paints Limited | Construction | 2022 |