| Power Cleaning Services Limited | Administrative & support | 1973 |
| Power Culture Media Co Ltd | Wholesale & retail | 2025 |
| Power Distribution Ltd | Wholesale & retail | 2000 |
| Power F Limited | Wholesale & retail | 2025 |
| Powerclean Truck Washing Services Ltd | Administrative & support | 2025 |
| Powerise Limited | Financial services | 1987 |
| Powerlift Plant Limited | Professional & scientific | 1984 |
| PPL Flooring Contractors Ltd | Construction | 2021 |
| Practically Purrfect Ltd | Wholesale & retail | 2025 |
| Praline Mocha Ltd | Wholesale & retail | 2023 |
| Precious Choices Limited | Wholesale & retail | 2025 |
| Precision Medical Education Ltd | Education | 2025 |
| Preda Housing Ltd | Real estate | 2022 |
| Premier Cars (Essex) Limited | Wholesale & retail | 2019 |
| Premier Industrial Coatings Limited | Transport & logistics | 1997 |
| Premier Law Chambers Ltd | Professional & scientific | 2005 |
| Premium Quality Foods Ltd. | Wholesale & retail | 1997 |
| Premium Tools Ltd Ltd | Information & communication | 2023 |
| Preradic Limited | Professional & scientific | 2007 |
| Presadeb Company Limited | Wholesale & retail | 2007 |
| Presence in Billericay Limited | Manufacturing | 2003 |
| Prestige Hair Supply Ltd | Wholesale & retail | 2024 |
| Prestige Sealants Limited | Construction | 2001 |
| Prestons Consultancy Limited | Professional & scientific | 1997 |
| Prestons Recruitment Consultants Limited | Administrative & support | 2006 |
| PRG Rentals Ltd | Real estate | 2024 |
| Prima Image Italia Limited | Real estate | 1997 |
| Prime Bridge Traders Ltd | Wholesale & retail | 2025 |
| Prime Careers Plus Ltd | Information & communication | 2026 |
| Prime Delivery Logistics Ltd | Transport & logistics | 2020 |
| Prime Dispatch UK Ltd | Wholesale & retail | 2026 |
| Prime Green Grocers Ltd | Agriculture & fishing | 2026 |
| Prime Nest Outlet Ltd | Wholesale & retail | 2025 |
| Prime Path Enterprises Ltd | Wholesale & retail | 2025 |
| Prime Properties & Homes Ltd | Real estate | 2025 |
| Prime Supplies Group Ltd | Wholesale & retail | 2026 |
| Primehub Tradres Ltd | Wholesale & retail | 2025 |
| Primenext Ltd | Transport & logistics | 2025 |
| Primeshop Limited | | 1988 |
| Primetoday Limited | Professional & scientific | 1992 |
| Primy Home UK Ltd | Wholesale & retail | 2025 |
| Prince Arboriculture Limited | Other services | 2005 |
| Princess Court Apartments Limited | Real estate | 1982 |
| Principle Lifts Limited | Manufacturing | 2004 |
| Print Anything Anytime Ltd | Manufacturing | 2026 |
| Printshrimp Ltd | Manufacturing | 2024 |
| Prior's Edge Management Company Limited | Construction | 2026 |
| Priority Management Services Limited | Real estate | 2001 |
| Priory Homes Limited | Construction | 1987 |
| Pritchard Consulting Limited | Information & communication | 1991 |
| Private Chauffeurs & Services Ltd | Transport & logistics | 2026 |
| Prmi Developments Limited | Real estate | 2005 |
| Pro Beauty Studio London Ltd | Health & social care | 2023 |
| Pro Design & Build Limited | Construction | 2007 |
| Pro Paving Essex Ltd | Administrative & support | 2021 |
| Pro Safe Scaffolding Ltd | Construction | 2022 |
| Pro-Fix (GPS) Limited | Manufacturing | 2007 |
| Pro-Gk Ltd | Wholesale & retail | 2007 |
| Pro-Tech Designs Ltd | Information & communication | 1997 |
| Procraft Property Maintenance Ltd | Administrative & support | 2025 |
| Professional Cleaning Systems (London) Limited | | 1984 |
| Professional Cycle Marketing Limited | Wholesale & retail | 2004 |
| Professional Detailers Ltd | Administrative & support | 2026 |
| Professional Diamond Services Limited | | 1989 |
| Progon I.T. Limited | Information & communication | 1997 |
| Progress Sales Limited | Wholesale & retail | 2005 |
| Progressive Apse Limited | Information & communication | 1996 |
| Projeck UK Ltd | Wholesale & retail | 2007 |
| Project Developers Ltd | Construction | 2022 |
| Project Finance Solutions International Limited | Professional & scientific | 2001 |
| Project Plastics Fabrications Limited | Manufacturing | 2002 |
| Project Resourcing Limited | Administrative & support | 2005 |
| Prologic Consultants Limited | Professional & scientific | 2018 |
| Promocollection Limited | Wholesale & retail | 2015 |
| Promotion Line Limited | Administrative & support | 2001 |
| Promotion Wine Limited | Wholesale & retail | 2003 |
| Pronounce Software Limited | Information & communication | 2000 |
| Prontoparts Limited | Wholesale & retail | 1993 |
| Property and Commercial Enterprises Limited | Real estate | 1984 |
| Property Cartel Capital Ltd | Real estate | 2026 |
| Property Certificates London Ltd | Households | 2024 |
| Property Developments (Essex) Limited | | 1987 |
| Property Improvement Centre Limited | Construction | 2007 |
| Property Lifts Limited | Construction | 2011 |
| Property Maintenance and Services 4 U Limited | Construction | 2007 |
| Property Management Essex Limited | Real estate | 2017 |
| Proseal Essex Limited | Construction | 2002 |
| Proshootai Ltd | Information & communication | 2024 |
| Prosmatt Ltd | Other services | 2025 |
| Prosper Hill Support Services Ltd | Wholesale & retail | 2019 |
| Prosperstep Ltd | Wholesale & retail | 2026 |
| Protech Data Management Limited | Information & communication | 1998 |
| Protech Embroidery Limited | Professional & scientific | 1998 |
| Protech TV & Video Limited | Manufacturing | 1996 |
| Protective Security Solutions PSS Ltd | Administrative & support | 2024 |
| Protects Plus Limited | Professional & scientific | 2021 |
| Protel Consultancy (UK) Limited | Information & communication | 1999 |
| Protheroe’S Logistics Ltd | Transport & logistics | 2023 |
| Protocon Engineering Limited | Agriculture & fishing | 1972 |
| Prov Enterprise Ltd | Financial services | 1996 |