| One Stop Fernhurst Stores Ltd | Wholesale & retail | 2022 |
| One-World Design Limited | Professional & scientific | 2011 |
| Onfinance Limited | Information & communication | 2017 |
| Opera Omnibus | Arts & recreation | 1996 |
| Original Cafe Racer Co. Ltd | Wholesale & retail | 2016 |
| Ortomation Ltd | Professional & scientific | 2021 |
| Oven Cleaners Surrey Ltd | Administrative & support | 2024 |
| Overton Farm (Lymington) Ltd | Agriculture & fishing | 1994 |
| Overwood People Consulting Limited | Administrative & support | 2017 |
| Ozzys Cafe Limited | Hospitality | 2012 |
| Paac IT Limited | Other services | 2009 |
| Pacam Consulting Limited | Professional & scientific | 2024 |
| PAD Media Ltd | Information & communication | 2013 |
| PAKT3D Ltd | Professional & scientific | 2020 |
| Pale Estates Ltd | Real estate | 2020 |
| Pall Mall Concierge Limited | Arts & recreation | 2021 |
| Pall Mall Tickets Ltd | Other services | 2020 |
| Panorama Property Developments Limited | Construction | 1998 |
| Panorama Property Investments LLP | | 2014 |
| Papakura Property Limited | Real estate | 2018 |
| Park Road Suites Management Company Limited | Real estate | 1991 |
| Parta Group Ltd | Information & communication | 2025 |
| Pathfields Close Management Company Ltd | Real estate | 2026 |
| Pathfinder Carbon Consulting Limited | Professional & scientific | 2023 |
| Patton Architecture & Development Limited | Professional & scientific | 2014 |
| Paul Nicholls Management Solutions Limited | Professional & scientific | 2011 |
| Paws and Pads Pet Services Ltd | Other services | 2023 |
| Payroll People Ltd | Administrative & support | 2015 |
| PBA Creative Solutions Limited | Information & communication | 2006 |
| PCP Cladding Limited | Construction | 2008 |
| PCS Technology Consulting Limited | Professional & scientific | 2024 |
| PDF Plaza Limited | Information & communication | 2026 |
| PDM Consulting Limited | Professional & scientific | 2021 |
| Peak Facilities Ltd | Construction | 2021 |
| Peak Freak Ltd | Other services | 2025 |
| Peal Partnership Ltd | Professional & scientific | 2007 |
| Pecc Contracting Limited | Construction | 1985 |
| Pegasus Close Limited | Households | 1988 |
| PEM Construction Limited | | 1958 |
| Penrose Partnership Limited | Information & communication | 2010 |
| Peony Gifts Ltd | Wholesale & retail | 2017 |
| Perceptor Limited | Professional & scientific | 1995 |
| Perennial AI Limited | Financial services | 2025 |
| Performance Legal Limited | Professional & scientific | 2025 |
| Petersstoreuk Limited | Wholesale & retail | 2024 |
| Petro-Celtex Consultancy Limited | Mining & quarrying | 1997 |
| Petrolegal and Commercial Services Ltd | Mining & quarrying | 2010 |
| Petworth Road Ltd | Real estate | 2020 |
| Petworth Road Management Company Limited | Households | 2021 |
| Philament Lighting Limited | Arts & recreation | 2008 |
| Phillips Land and Estate Company Limited | Real estate | 1935 |
| Phoenix Oriental Ltd | Other services | 2024 |
| Pied Piper Productions Limited | Arts & recreation | 2008 |
| Pierce Consulting Limited | Information & communication | 2017 |
| Pilates From Within Ltd | Arts & recreation | 2024 |
| Pinhas Rutenberg Educational Trust | Education | 1945 |
| Pinkeye Ltd | Wholesale & retail | 2023 |
| Pinnprime Capital Ltd | Professional & scientific | 2024 |
| Pippa Greenwood Limited | Professional & scientific | 2011 |
| Pitch and Paddock Ltd | Manufacturing | 2014 |
| Pixel Immersion Ltd | Arts & recreation | 2019 |
| Planlens Ltd | Information & communication | 2025 |
| Plucky Productions Limited | Arts & recreation | 2022 |
| Plumb Plumb UK Limited | Construction | 2014 |
| Plums Limited | Education | 1999 |
| Podium Financial Ltd | Professional & scientific | 2019 |
| Podmore Limited | Real estate | 2022 |
| Pokebarn Limited | Wholesale & retail | 2026 |
| Poolcourt Ltd | Construction | 1999 |
| Positive Aspects Limited | Administrative & support | 2003 |
| Positive Mind Action Ltd | Health & social care | 2024 |
| Potter Owtram and Peck LLP | | 2018 |
| PPT (Health Safety & Environment) Limited | Professional & scientific | 2008 |
| PQ Design & Development Limited | Professional & scientific | 2010 |
| Prahltech Ltd | Information & communication | 2026 |
| Praxis Consulting Limited | Professional & scientific | 1998 |
| Premier Building Products (Anglia) Limited | Construction | 2009 |
| Premier Building Products Limited | Construction | 2005 |
| Premium 4S Ltd | Wholesale & retail | 2023 |
| Prime Leisure Group Limited | Arts & recreation | 2020 |
| Prime PAY and Tax Limited | Administrative & support | 2016 |
| Prime Student Properties Limited | Real estate | 2016 |
| Primewave Ltd | Hospitality | 2024 |
| Priors Wood Residents Association Limited | Other services | 1999 |
| Profiler Ltd | Manufacturing | 2009 |
| Progress International Limited | Professional & scientific | 2002 |
| PROJECT42 Future Tech Limited | Wholesale & retail | 2014 |
| Property Stiles Ltd | Other services | 2017 |
| Proppa Limited | Information & communication | 2025 |
| Protect CSM Ltd | Administrative & support | 2017 |
| Proteus Solutions Limited | Professional & scientific | 2010 |
| Proud Designs Limited | Information & communication | 2012 |
| Proven Motor Company Limited | Wholesale & retail | 2001 |
| PS Skyline Limited | Real estate | 2022 |
| PSF Steel Limited | Construction | 2011 |
| PT1 Limited | Construction | 2008 |
| Puremess Ltd | Wholesale & retail | 2021 |
| PXR Property Limited | Real estate | 2019 |
| PYW Investments Limited | Financial services | 1995 |
| Q2BSOLUTIONS Limited | Professional & scientific | 2017 |