| Partners in Education (UK) Limited | Education | 1998 |
| Pass Marketing Limited | Information & communication | 2020 |
| Passive Fire Inspection Ltd | Construction | 2022 |
| Path Investments (London) Holdings Limited | Administrative & support | 2016 |
| Path Investments (London) Limited | Construction | 2016 |
| Path to Possibilities Limited | Education | 2008 |
| Pathway Programme Limited | Professional & scientific | 2025 |
| Paul Alexander Kitchens Limited | Other services | 2019 |
| Paul Carter OLE Project Management Ltd | Other services | 2022 |
| Paul Joseph Ltd | Professional & scientific | 2003 |
| Paul Soteriou Limited | Transport & logistics | 2007 |
| Pavetime Limited | Construction | 1985 |
| Pavilion Graphics Limited | Construction | 2013 |
| PAW Brew Ltd | Wholesale & retail | 2023 |
| PB Clearance Limited | Water & waste | 2023 |
| Pbarc Ltd | Professional & scientific | 2021 |
| PCP Management Services Ltd | Professional & scientific | 2001 |
| PCP Secretarial Services Ltd | Professional & scientific | 2008 |
| PD Koumourou LLP | | 2024 |
| PDI Professional Services Ltd | Information & communication | 2020 |
| PDM Contracts & Services Limited | Real estate | 2018 |
| Pdvf Consultancy Limited | Professional & scientific | 2018 |
| Peace Commercial Properties Limited | Real estate | 2025 |
| Peachtree Developments Ltd | Construction | 2023 |
| Peak Edge Ventures Ltd | Financial services | 2021 |
| Peakwise Ltd | Information & communication | 2025 |
| Pearl Drops Retail Limited | Wholesale & retail | 2023 |
| Pearson Specter Litt Limited | Real estate | 2025 |
| Pease Pudding Properties Limited | Real estate | 2020 |
| Pebles Ltd | Real estate | 2022 |
| Pecan Ventures Limited | Wholesale & retail | 1997 |
| Peckfords Electrical Contractors Limited | Construction | 1996 |
| Peel Street Villas Management Ltd | Real estate | 2017 |
| Pelham Management (Newport) Limited | Households | 2018 |
| Pemberton Studios Ltd | Professional & scientific | 2021 |
| Penn Barbers Limited | Other services | 2020 |
| Penn Scaffolding Ltd | Construction | 2023 |
| Pentara Financial Ltd | Professional & scientific | 2024 |
| Pepperdoi Limited | Construction | 2011 |
| Perand Limited | Real estate | 1996 |
| Perry Vale RTM Company Limited | Households | 2019 |
| Persian Crafts Limited | Wholesale & retail | 2025 |
| Petal Gardens Ltd | Administrative & support | 2024 |
| Petronova Ltd | Mining & quarrying | 2025 |
| Pets in the City Limited | Other services | 2008 |
| PGH Commercial Services Ltd | Manufacturing | 2010 |
| Pharmlyga Holding LLP | | 2014 |
| Phase Pact Limited | Professional & scientific | 2013 |
| Phdc (London) Ltd | Construction | 2026 |
| PHI Architectural Services Ltd. | Professional & scientific | 2012 |
| Philaz Limited | Transport & logistics | 2004 |
| Philippa Bradley Agencies Limited | Wholesale & retail | 2008 |
| Phillip Cooper Limited | Professional & scientific | 1998 |
| Phillipa Clow Limited | Professional & scientific | 1996 |
| Phoenix Events Ltd | Arts & recreation | 2025 |
| Phoenix P S Limited | Administrative & support | 2009 |
| Phoenix Scrap Metals Limited | Administrative & support | 2021 |
| Phoenix Staffing Ltd | Administrative & support | 2016 |
| Phoenix Storage Ltd | Administrative & support | 2004 |
| Phrantik Films Ltd | Arts & recreation | 2011 |
| Phyllberry Limited | Administrative & support | 2023 |
| Physio Dynamics Ltd | Professional & scientific | 2011 |
| Pier SG Limited | Professional & scientific | 2018 |
| Pier Stone Limited | Construction | 2018 |
| Pigna Limited | Professional & scientific | 2011 |
| Pinder Reaux & Associates Ltd | Professional & scientific | 2012 |
| Pine Court (Freehold) Management Company Limited | Households | 2017 |
| Pine Properties and Estates Limited | Real estate | 2019 |
| Pine Properties Estates Limited | Real estate | 2022 |
| Pink Electricians Ltd | Construction | 2025 |
| Piper Glass Limited | Manufacturing | 2001 |
| Piper Toughened Glass Limited | Manufacturing | 1983 |
| Pixel Advertising Limited | Professional & scientific | 2020 |
| Pixel Blox Ltd | Information & communication | 2024 |
| Pixel Moon Media Limited | Wholesale & retail | 2011 |
| Pixelpulse Ltd | Information & communication | 2024 |
| Piyolin Traders UK Limited | Wholesale & retail | 2025 |
| PJ Butter Essentials Ltd | Wholesale & retail | 2026 |
| PJ Field Property Limited | Real estate | 2022 |
| PJD Global Limited | Wholesale & retail | 2022 |
| PKJ Leasehold Ltd | Real estate | 2020 |
| Plan IT Homes Ltd | Wholesale & retail | 2022 |
| Planning Associates Ltd | Professional & scientific | 2016 |
| Planslot Property Management Limited | Households | 1989 |
| Playne Goods Ltd | Wholesale & retail | 2022 |
| Plumbers Mate (Potters Bar) Brothers Ltd | Wholesale & retail | 2019 |
| Plumbing & Building Services Ltd | Construction | 2008 |
| Plumbing Technical Services Limited | Construction | 2005 |
| PMJ Cleaning Ltd | Construction | 2008 |
| PMJ Services MK Ltd | Professional & scientific | 2025 |
| PMR Industrial Flooring Ltd | Construction | 2023 |
| Pmweb Limited | Professional & scientific | 2007 |
| Pmxmb Limited | Professional & scientific | 2022 |
| POD Pilates Ltd | Arts & recreation | 2019 |
| Pointcore Limited | Construction | 1990 |
| Pokkisham Ltd | Wholesale & retail | 2020 |
| Polaris Models Ltd | Manufacturing | 2017 |
| Polestar Pictures Limited | Information & communication | 2010 |
| Polfrost Consulting Ltd | Information & communication | 2011 |
| Pollyfreya Ltd | Construction | 2019 |