| Park Square Properties Ltd | Real estate | 2024 |
| Parker Visuals Ltd | Professional & scientific | 2026 |
| Parkes Groundwork & Construction Ltd | Construction | 2020 |
| Parkinson Richmark Limited | Manufacturing | 1987 |
| Parma Automotive Ltd | Extraterritorial | 2011 |
| Parrisianne DRY Cleaning Solutions Limited | Wholesale & retail | 2002 |
| Parrisianne Finance Limited | Financial services | 1991 |
| Parsons Summers Limited | Professional & scientific | 2022 |
| Partbox Ltd | Wholesale & retail | 2026 |
| Party Wall Solutions Online Ltd | Professional & scientific | 2018 |
| Pass BP Ltd | Arts & recreation | 2012 |
| Passionate Properties Ltd | Real estate | 2018 |
| Patch & COE Limited | Manufacturing | 2019 |
| Pater ET Filia Ltd | Wholesale & retail | 2025 |
| Paternoster Consultancy Ltd | Professional & scientific | 2026 |
| Paul Adams Wealth Management Ltd | Financial services | 2010 |
| Paul Hannaford CIC | Education | 2026 |
| Paul Jolly Financial Services Limited | Financial services | 2013 |
| Paul Nisbett Limited | Information & communication | 2012 |
| Paul Tetu Property Services Limited | Professional & scientific | 2003 |
| Pauls Flooring Ltd | Construction | 2019 |
| Pavitt Associates Limited | Information & communication | 2012 |
| Pb&G Limited | Professional & scientific | 2011 |
| PD Sena Limited | Construction | 2011 |
| Pdhc Services Ltd | Education | 2022 |
| PDT Power Engineering Limited | Professional & scientific | 2009 |
| PDX Biomed Ltd | Health & social care | 2024 |
| PE People Limited | Administrative & support | 2023 |
| Peacorp Limited | Information & communication | 2019 |
| Peak One Angling Ltd | Arts & recreation | 2025 |
| Peak One Leisure Ltd | Arts & recreation | 2025 |
| Peak One Properties Ltd | Construction | 2025 |
| Pearl Hackney Wick Limited | Hospitality | 2016 |
| Pedersen & Partners Consultancy Limited | Administrative & support | 2011 |
| Pelham Design Services Limited | Professional & scientific | 1999 |
| Pemak Medical Limited | Health & social care | 2018 |
| Pemberton Dear Ltd | Professional & scientific | 1991 |
| Pemberton Property Management & Co. Limited | Construction | 2024 |
| Pemon Medical Limited | Health & social care | 2015 |
| Pendower Services Ltd | Construction | 2019 |
| Pennant Consulting Limited | Professional & scientific | 1999 |
| People in Print Limited | Administrative & support | 1987 |
| Pepaul Limited | Wholesale & retail | 2011 |
| Perfect Gardens (London) Limited | Administrative & support | 1995 |
| Perfect Gardens Limited | Administrative & support | 2022 |
| Performing Arts Database Limited | Administrative & support | 2016 |
| Pets World Online Limited | Wholesale & retail | 2025 |
| Pexy Financial Limited | Financial services | 2015 |
| Pgma Limited | Construction | 2024 |
| Phantom BIM Solutions Ltd | Construction | 2024 |
| Phelm Limited | Health & social care | 2015 |
| Phil Tucker Limited | Professional & scientific | 2011 |
| Philip Anstey Properties Limited | Real estate | 2001 |
| Philobiblon (UK) Limited | Professional & scientific | 2007 |
| Phoenix Green UK Limited | Construction | 1997 |
| Phoenix Logistics & Van Hire Ltd | Transport & logistics | 2026 |
| Phoenix Precision Paints Limited | Manufacturing | 1999 |
| Phoenix Shipping Ltd | Transport & logistics | 2026 |
| Phukewe Limited | Extraterritorial | 2017 |
| Phuture Phuture Ltd | Information & communication | 2021 |
| PHY Enterprises Limited | Information & communication | 2016 |
| Piano Nobile Holdings Limited | Financial services | 2021 |
| Piano Nobile Limited | Extraterritorial | 2021 |
| Pilgrims Hatch Rrjm Limited | Hospitality | 2022 |
| Pimentasilva's Ltd | Transport & logistics | 2025 |
| Pinchos Restaurant Ltd | Hospitality | 2018 |
| Pink Garlic (Broadway) Limited | Extraterritorial | 2016 |
| Pink Garlic (CM3) Limited | Extraterritorial | 2016 |
| Pisani Limited | Wholesale & retail | 2018 |
| PJC Surveying Services Ltd | Professional & scientific | 2026 |
| PJM Fire Limited | Construction | 2018 |
| PJT Construction UK Limited | Construction | 2012 |
| PJT Flood and Construction Ltd | Construction | 2021 |
| PKA Systems Limited | Information & communication | 2002 |
| Pkboo Music Limited | Arts & recreation | 2007 |
| Plan Deliver Maintain Limited | Construction | 2015 |
| Platinum Heating Essex Ltd | Construction | 2020 |
| Pleasant Development Consultancy Ltd | Real estate | 2010 |
| Plush Grass Ltd | Construction | 2023 |
| PM Networks Solutions Ltd | Information & communication | 2010 |
| PMD Construction Limited | Construction | 2001 |
| PMD Developments Limited | Construction | 2015 |
| PMV Essex Limited | Wholesale & retail | 1996 |
| PMW Logistic Solutions Ltd | Professional & scientific | 2018 |
| Podium 4 Limited | Professional & scientific | 2007 |
| Podium Transport Management Limited | Transport & logistics | 2021 |
| Pogoclick Ltd | Wholesale & retail | 2014 |
| Point Perspective Limited | Professional & scientific | 2015 |
| Polybridge UK Limited | Other services | 2020 |
| Pooches Paradise Ltd | Other services | 2024 |
| Pool Craft Retail Limited | Wholesale & retail | 2023 |
| Poplarace Ltd | Extraterritorial | 2005 |
| Portal Property Ltd | Real estate | 2023 |
| Posh Boys Brewery Limited | Hospitality | 2017 |
| Positive Pennies Limited | Information & communication | 2013 |
| Potman Limited | Wholesale & retail | 2014 |
| Pots to Inspire Ltd | Wholesale & retail | 2015 |
| Power Advisory Services Ltd | Professional & scientific | 2025 |
| Power Nest Solutions Ltd | Administrative & support | 2025 |
| Powered by Batteries Limited | Manufacturing | 2019 |