| Paul North Agencies Limited | Wholesale & retail | 2004 |
| Paul Vick Architects Limited | Professional & scientific | 2011 |
| Paul ZAK Photography Ltd | Administrative & support | 2007 |
| Paulsons Traffic Management Ltd | Administrative & support | 2015 |
| Pawsitively Training & Boarding Ltd | Agriculture & fishing | 2025 |
| Paxhart Event Management Limited | Administrative & support | 2015 |
| Paymenow Holdings Limited | Financial services | 2024 |
| Payments C M LLP | | 2005 |
| Payments Industry Intelligence Ltd | Information & communication | 2025 |
| Payroll Services X Ltd | Administrative & support | 2019 |
| Payrology Ltd | Professional & scientific | 2017 |
| Paytrack Limited | Administrative & support | 2015 |
| Pb-J Ltd | Transport & logistics | 2014 |
| Pbandvb Ltd | Extraterritorial | 2012 |
| PBM Professional Limited | Professional & scientific | 2025 |
| PBR Property Limited | Construction | 2023 |
| PBSA107 Limited | Construction | 2025 |
| PBY Ltd | Professional & scientific | 2016 |
| PC Enterprises Ltd | Information & communication | 2015 |
| PC Interlink Ltd | Wholesale & retail | 2025 |
| PCC PLC | Wholesale & retail | 1997 |
| PCL (London) Limited | Administrative & support | 2016 |
| PD Intelligence Limited | Information & communication | 2026 |
| Pd&Na Investments Limited | Construction | 2020 |
| PDS Plus Ltd | Administrative & support | 2023 |
| PDS UK Flexibles Ltd | Administrative & support | 2023 |
| Peacock Refurbishment Limited | Construction | 2018 |
| Peak Productions Limited | Arts & recreation | 2015 |
| Peak Services (Accommodation) Limited | Administrative & support | 1996 |
| Peakarch Limited | Professional & scientific | 2020 |
| Pearce Leane Scaffolding Limited | Construction | 2007 |
| Pearsall Properties Ltd | Real estate | 2024 |
| Pearson Panke Limited | Wholesale & retail | 1981 |
| Peasnell & SON Ltd | Wholesale & retail | 2025 |
| Pebbles London Limited | Hospitality | 2021 |
| Pelican Square Limited | Professional & scientific | 2018 |
| Pelstar Computing Limited | Information & communication | 1994 |
| Pembroke Property Development Ltd | Real estate | 2025 |
| Pendarren Court Limited | Health & social care | 2015 |
| Peniel Haven Ltd | Health & social care | 2021 |
| Peniel Haven Properties Limited | Real estate | 2016 |
| Pennacle Consulting Limited | Administrative & support | 2015 |
| Pennacle Estates Limited | Real estate | 2023 |
| Pennypani Retail Limited | Wholesale & retail | 2024 |
| Pennysworth Limited | Professional & scientific | 2021 |
| Penobscot Real Estate Development and Management Company Ltd | Real estate | 2022 |
| Penstone Communications Limited | Information & communication | 2004 |
| Penta Court Holdings Limited | Financial services | 2015 |
| Penta Court Management Company Limited | Households | 1987 |
| Pentagon Repair Group Ltd | Wholesale & retail | 2019 |
| Pentland (Bushey) Property Management Co Limited | Households | 1964 |
| People Innovations Limited | Professional & scientific | 1998 |
| People's Space Ltd | Real estate | 2020 |
| PEOPLE4IT Limited | Information & communication | 2010 |
| Peponi Medics Ltd | Health & social care | 2023 |
| Pepper Lets Ltd | Real estate | 2016 |
| Pepper Tech Ltd | Construction | 2016 |
| Pepys Street RTM Company Limited | Households | 2007 |
| Per-Medic Limited | Construction | 1977 |
| Pera Hair and Beauty Limited | Other services | 2024 |
| Pera Investments Ltd | Real estate | 2025 |
| Perapex Group Limited | Professional & scientific | 2025 |
| Percy Road Holdings Ltd | Real estate | 2020 |
| Perez Effects Ltd | Arts & recreation | 2021 |
| Performanta Limited | Administrative & support | 2010 |
| Perivallon Planning Limited | Administrative & support | 2025 |
| Perpetiel Limited | Other services | 2009 |
| Personaliseonline Limited | Wholesale & retail | 2014 |
| Personaliz Limited | Information & communication | 2016 |
| Pesky Kids Industries Ltd | Wholesale & retail | 2021 |
| Pet Protect Limited | Financial services | 1983 |
| Petal and Glow Limited | Wholesale & retail | 2023 |
| Petaphinx Limited | Information & communication | 2019 |
| Peter Allen Eyewear LLP | | 2008 |
| Peter Allen Optical Limited | Administrative & support | 2008 |
| Peter Forrester Sccs Limited | Professional & scientific | 2014 |
| Peter Frank Limited | Manufacturing | 2011 |
| Peter Macfarlane Limited | Information & communication | 2007 |
| Petrescu Ltd | Construction | 2018 |
| Petro Building Ltd | Construction | 2024 |
| Petronela's Cleaning Services Ltd | Administrative & support | 2026 |
| Peyronnet Pictures Limited | Information & communication | 2018 |
| PG Services Plumbing and Heating Ltd | Construction | 2019 |
| PGA Construction Ltd | Construction | 2023 |
| PGC Film & TV Ltd | Arts & recreation | 2026 |
| Phantom 2 Ltd | Real estate | 2013 |
| Pharaoh Developments Limited | Real estate | 2020 |
| Phare Consulting Ltd | Professional & scientific | 2019 |
| Pharmafocus Regulatory Services Ltd | Professional & scientific | 2010 |
| Pharmakey Holdings Limited | Professional & scientific | 2026 |
| Pharmapal (UK) Limited | Real estate | 2014 |
| Pharmapal Limited | Wholesale & retail | 2014 |
| Pharmareal Services Ltd | Health & social care | 2024 |
| Phat Stuff Enterprises Ltd | Wholesale & retail | 2013 |
| Phedal Estates Ltd | Real estate | 2020 |
| Phenix Production and Services Limited | Information & communication | 2015 |
| Philip Stannard Associates Limited | Administrative & support | 2000 |
| Philip Stewart Finance Ltd | Financial services | 2007 |
| Philipdaw Limited | Wholesale & retail | 2025 |
| Phillips Property Projects Limited | Extraterritorial | 2014 |