| Porter and Davies Limited | Manufacturing | 2010 |
| Portia Abatan Ltd | Information & communication | 2020 |
| Portland Construction (Sussex) Limited | Construction | 2007 |
| Portland Court Crowborough Management Company Limited | Households | 2011 |
| Portland Fish & Chips Ltd | Hospitality | 2024 |
| Portland Fishery's Ltd | Wholesale & retail | 2019 |
| Portland Lifting Consultancy Ltd | Construction | 2018 |
| Portland Mini Store Ltd | Wholesale & retail | 2023 |
| Portland Road Hove Limited | Extraterritorial | 2014 |
| Portland Villas Limited | Wholesale & retail | 2018 |
| Portosanto Ltd | Real estate | 2023 |
| Portslade Bowls Club Limited | Arts & recreation | 2023 |
| Portunus Real Estate Limited | Real estate | 2017 |
| Possingworth Barns Ltd | Real estate | 2018 |
| Post Creatives Ltd | Professional & scientific | 2025 |
| Postop Physio Care Limited | Other services | 2025 |
| Potencia Limited | Construction | 2013 |
| Potenza Design and Engineering Limited | Wholesale & retail | 2018 |
| Potis Construction Ltd | Construction | 2025 |
| Pound Saver International Limited | Wholesale & retail | 2025 |
| Powder Design Ltd | Wholesale & retail | 2010 |
| Power-Up Studios Ltd | Information & communication | 2024 |
| Powerinvest Ltd | Energy | 2017 |
| Powerplant Home Automation Limited | Other services | 2009 |
| Powis Lodge (Brighton) Limited | Households | 2008 |
| Powwowpeople Ltd | Administrative & support | 2019 |
| PP Tapas 8 Ltd | Hospitality | 2026 |
| Pp&Rr Services Ltd | Financial services | 2025 |
| PP4CTO Limited | Extraterritorial | 2020 |
| PPH Lodge Ltd | Real estate | 2025 |
| PR Redstone Ltd | Health & social care | 2018 |
| PR16 Capital Ltd | Financial services | 2025 |
| Practices Made Perfect Limited | Professional & scientific | 1993 |
| Precious Wonder Holding Company Limited | Financial services | 2022 |
| Precision Air Surveys Limited | Extraterritorial | 2023 |
| Precision Reformer Pilates Academy Ltd | Education | 2025 |
| Precision SET Creations Ltd | Financial services | 2025 |
| Precision Survey Solutions Limited | Construction | 2020 |
| Premier Fabricare Services Limited | Administrative & support | 2001 |
| Premier Sports & Leisure Group Limited | Wholesale & retail | 2007 |
| Preserve Climate Solutions Ltd | Manufacturing | 2022 |
| Presidential Cleaning Ltd | Administrative & support | 2025 |
| Prestige Homes Construction Limited | Construction | 2023 |
| Prestige Hospitality Holdings Limited | Financial services | 2020 |
| Prestige Leisure Group Ltd | Financial services | 2020 |
| Prestige NS Properties Ltd | Real estate | 2020 |
| Prestige Paintworx Limited | Wholesale & retail | 2025 |
| Prestige Property Park Limited | Real estate | 2026 |
| Prestige Supply Services Ltd | Wholesale & retail | 2024 |
| Prestige Traditional Turkish Barbers Ltd | Other services | 2018 |
| Prestige Worldwide (UK) Ltd | Professional & scientific | 2012 |
| Preston Nomads Cricket Club | Education | 2017 |
| Preston Park Avenue Ltd | Professional & scientific | 2012 |
| Preston Street Launderette Ltd | Administrative & support | 2008 |
| Pretty People Ltd | Health & social care | 2019 |
| Priavo Event Security Limited | Administrative & support | 2025 |
| Priavo Security Limited | Administrative & support | 2013 |
| Price's Bespoke Interiors Ltd | Construction | 2009 |
| Price’S Buildings Maintenance Limited | Construction | 2025 |
| Pridewell Engineering Limited | Manufacturing | 2004 |
| Prier DE Saône Ltd | Wholesale & retail | 2019 |
| Prima Capital Group Limited | Other services | 2024 |
| Prime Build Construction Solutions Ltd | Construction | 2026 |
| Prime Ealing Properties Limited | Real estate | 2016 |
| Prime Electrical Limited | Construction | 2018 |
| Prime Element Services Ltd | Professional & scientific | 2021 |
| Prime Holiday Lets Limited | Hospitality | 2025 |
| Prime Liquor Ltd | Wholesale & retail | 2025 |
| Prime Location Hotels Limited | Hospitality | 2005 |
| Prime Surbiton Management Company Limited | Real estate | 2024 |
| Prime Surbiton Properties Ltd | Construction | 2020 |
| Primekey (Hove) Ltd | Households | 2024 |
| Primekleen Limited | Administrative & support | 2026 |
| Princes Court Lessees Limited | Real estate | 2001 |
| Principal Aspect Ltd | Real estate | 2022 |
| Priority Health Chiropractic Limited | Health & social care | 2015 |
| Priors Management Company Ltd | Administrative & support | 2013 |
| Priory House Lewes RTM Company Ltd | Households | 2012 |
| Prism Potential Ltd | Other services | 2021 |
| Private ENT Limited | Financial services | 2002 |
| Private General Practice Ltd | Health & social care | 2019 |
| Private Prescriptions Limited | Information & communication | 2025 |
| Prize Limited | Information & communication | 1998 |
| Pro Build & Sons Property Services Limited | Administrative & support | 2016 |
| Pro Build and Sons Development Group Ltd | Construction | 2025 |
| Pro-Fitness Haywards Heath Ltd | Education | 2025 |
| Pro-Fitness Ringmer Ltd | Education | 2025 |
| Pro-Lam Limited | Manufacturing | 1992 |
| Proact Security Group Limited | Administrative & support | 2000 |
| Prodata Partners Limited | Professional & scientific | 1992 |
| Prodger & Sons Limited | Construction | 2009 |
| Producertech Limited | Arts & recreation | 2009 |
| Professional Adviser Services Limited | Professional & scientific | 2004 |
| Professional Property Alliance Limited | Real estate | 2003 |
| Profile + Aesthetics Ltd | Other services | 2020 |
| Proformatte Ltd | Information & communication | 2024 |
| Project 19 Events Ltd | Professional & scientific | 2025 |
| Project Beer Ltd | Hospitality | 2019 |
| Project Diaries Ltd | Information & communication | 2020 |
| Project Edge Bidco UK Limited | Financial services | 2025 |