| Port Hotel Eastbourne Limited | Real estate | 2019 |
| Port Hotels Limited | Financial services | 2019 |
| Port Moresby Management Limited | Extraterritorial | 2014 |
| Port Regent (Phase II) Management Limited | Households | 1999 |
| Port Regent Property Management Limited | Households | 1998 |
| Port Serra Planning Ltd | Professional & scientific | 2025 |
| Porteous London Ltd | Health & social care | 2019 |
| Porters Investments Holdings Ltd | Financial services | 2026 |
| Porters Property Development Ltd | Construction | 2021 |
| Porters Property Investments Ltd | Real estate | 2021 |
| Portfolio Investment Limited | Financial services | 2025 |
| Portfolio Privé Limited | Construction | 2025 |
| Portia Rented Homes Limited | Real estate | 2003 |
| Portman BEE RTM Company Limited | Households | 2024 |
| Portway Homes Limited | Construction | 2011 |
| Posh Clinique Ltd | Health & social care | 2024 |
| Posh Nails and Beauty Limited | Extraterritorial | 2018 |
| Posh Paws Grooming Ltd | Other services | 2026 |
| Potential Minds Ltd | Professional & scientific | 2020 |
| Potiwal Enterprises Limited | Health & social care | 2022 |
| Potiwal Property Ltd | Real estate | 2025 |
| Pottery and Pints Ltd | Education | 2021 |
| Poulton Remedial Services (Holdings) Limited | Financial services | 2012 |
| Poulton Remedial Services Limited | Construction | 1965 |
| POV Construction Limited | Construction | 2013 |
| Power Pong UK Limited | Wholesale & retail | 2021 |
| Power Right Ltd | Construction | 2018 |
| Power Savings Network Limited | Energy | 2026 |
| Powered Approach FT LLP | | 2025 |
| PP Properties Sussex Limited | Real estate | 2024 |
| PPH Arts CIC | Hospitality | 2022 |
| PPH Services Limited | Construction | 2018 |
| Pprv Handy Stores Ltd | Wholesale & retail | 2023 |
| Pprv Investments Limited | Real estate | 2021 |
| Pprv Trading Limited | Wholesale & retail | 2022 |
| Pqlaw Ltd | Professional & scientific | 2025 |
| PR Electrical Installations Limited | Manufacturing | 2002 |
| Practical Perseverance Limited | Professional & scientific | 2016 |
| Pramukh Housing Limited | Real estate | 2021 |
| Prara Limited | Wholesale & retail | 2019 |
| Precise Cars Limited | Wholesale & retail | 2018 |
| Precise Construction Limited | Administrative & support | 2013 |
| Precise Groundworks Ltd | Construction | 2025 |
| Precise Property Investment Group Limited | Real estate | 2017 |
| Precision Aerial Photography Ltd | Professional & scientific | 2026 |
| Precision Medicine Limited | Health & social care | 2024 |
| Precision Sealing Technology Limited | Wholesale & retail | 2011 |
| Precision Watches Limited | Wholesale & retail | 2025 |
| Premier Extra Limited | Wholesale & retail | 2007 |
| Premier Financial Advice Ltd | Financial services | 2002 |
| Premier Halal Butcher Ltd | Wholesale & retail | 2020 |
| Premier Kitchens Design & Installation Limited | Construction | 2008 |
| Premier Mortgage Solutions Limited | Financial services | 2009 |
| Premier Plumbing & Heating Southern Limited | Construction | 2009 |
| Premier Project Management Limited | Construction | 2021 |
| Premiere Baby Limited | Manufacturing | 2001 |
| Premium Options Limited | Financial services | 2011 |
| Premium Sussex Security Ltd | Administrative & support | 2023 |
| Prepare for Finance Limited | Professional & scientific | 2025 |
| Prescribed Science Ltd | Health & social care | 2026 |
| Present Homes Limited | Real estate | 2021 |
| Preshly Ltd | Information & communication | 2022 |
| Prestige Bodyshop (South East) Limited | Wholesale & retail | 2025 |
| Prestige Properties 786 Limited | Real estate | 2020 |
| Prestige Property Management (Brighton) Limited | Administrative & support | 2016 |
| Prestige Property Management (South) Ltd | Households | 2019 |
| Prestige Showers Limited | Construction | 2025 |
| Price Developments (South East) Limited | Extraterritorial | 2013 |
| Pricewatch Developments Ltd | Real estate | 2019 |
| Pride Home Management Ltd | Real estate | 2024 |
| Pride Property Investments Limited | Real estate | 2021 |
| Prideaux Court Limited | Households | 1958 |
| Prideaux House Care (Holdings) Limited | Financial services | 2013 |
| Prideaux House Care Limited | Health & social care | 2005 |
| Prideaux Lodge Care Ltd | Health & social care | 2014 |
| Prideaux Manor Care Limited | Health & social care | 2020 |
| Prideaux Property Ltd | Real estate | 2024 |
| Primary Care Digital Ltd | Information & communication | 2024 |
| Prime Residential Sussex Ltd | Real estate | 2022 |
| Prime Sussex Limited | Real estate | 2025 |
| Primebaj Eastbourne Cleaning Ltd | Administrative & support | 2026 |
| Primestep Soles Ltd | Wholesale & retail | 2026 |
| Primitech Ltd | Construction | 2017 |
| Print King Ltd | Wholesale & retail | 2019 |
| Printers Playhouse Limited | Hospitality | 2015 |
| Prints Regent Limited | Manufacturing | 2012 |
| Priors Management Holding Limited | Financial services | 2024 |
| Priory Court (Eastbourne)Limited | Households | 1960 |
| Pristine Cleaning Ltd | Administrative & support | 2025 |
| Pristine Pearl Cleaning Services Ltd | Administrative & support | 2023 |
| Pristine Roofing and Cladding Limited | Construction | 2015 |
| Private Ward Limited | Real estate | 2019 |
| PRK Investments Limited | Real estate | 2019 |
| PRM Property Management Ltd | Real estate | 2012 |
| Pro Pro Photography Limited | Professional & scientific | 2025 |
| Pro-Eco Business Ltd | Financial services | 2024 |
| Pro-Eco Family Ltd | Financial services | 2024 |
| Pro-Re-Fab Limited | Hospitality | 2025 |
| Procoat Plastering Limited | Construction | 2024 |
| Procuur Limited | Extraterritorial | 2023 |