| Playmakers Group Limited | Information & communication | 2025 |
| Plessey Southern Flying Group Ltd | Arts & recreation | 2023 |
| Plrc Financial Management Ltd | Professional & scientific | 2016 |
| Plumb First Limited | Construction | 2015 |
| PLUMBERS4DRAINS Ltd | Construction | 2025 |
| Plumhouse Property Ltd | Hospitality | 2015 |
| Plumwoode Ltd | Real estate | 2024 |
| Plushie Ltd | Professional & scientific | 2005 |
| PM Plus Limited | Professional & scientific | 2000 |
| PMA Communications Ltd | Administrative & support | 2009 |
| PMA Holding Group Ltd | Financial services | 2023 |
| PMC Hi-Tech Projects Ltd | Financial services | 2020 |
| PMG Consulting UK Limited | Professional & scientific | 2018 |
| PNS Info Limited | Information & communication | 2015 |
| Poalbe Limited | Administrative & support | 2015 |
| Podella Limited | Administrative & support | 2017 |
| Polaris Project Consultancy Limited | Professional & scientific | 2025 |
| POP Gallery Limited | Wholesale & retail | 2021 |
| POP Print & Send Ltd | Manufacturing | 2025 |
| Pope Consulting Ltd | Professional & scientific | 1999 |
| Pope Customs Ltd | Wholesale & retail | 2023 |
| Pope Stevens Architecture Limited | Professional & scientific | 2011 |
| Poppydaisy Limited | Wholesale & retail | 2011 |
| Popular Choice Limited | Households | 1994 |
| Popular Developments Limited | Construction | 1994 |
| POR Cuatro Padel Ltd | Arts & recreation | 2024 |
| Porter Estate Agents Chichester Ltd | Real estate | 2024 |
| Porter Hardy Gardens Ltd | Administrative & support | 2025 |
| Porter Hardy Landscapes Ltd | Administrative & support | 2023 |
| Portmode Flooring Ltd | Construction | 2004 |
| Positano Home Cooking Limited | Hospitality | 2015 |
| Positive Change Marketing Limited | Professional & scientific | 2018 |
| Positive Routes to Well-Being C.I.C. | Health & social care | 2019 |
| Positivecfo Ltd | Professional & scientific | 2025 |
| Pothecary Ltd | Real estate | 2022 |
| Potter and Pundit Ltd | Administrative & support | 2021 |
| Power IS Bananas Limited | Other services | 2024 |
| Power on Electrical Contractors Ltd | Construction | 2023 |
| Power Services Limited | Administrative & support | 1996 |
| Powerco Energy Limited | Energy | 2016 |
| Powerworks EVC Ltd | Construction | 2022 |
| Powerworks Maintenance Services Ltd | Information & communication | 2012 |
| Poyser & Sons Limited | Wholesale & retail | 2017 |
| PPS Sussex Ltd | Administrative & support | 2024 |
| Prachee Partners Limited | Hospitality | 2025 |
| Pratt Developments | Hospitality | 1963 |
| Precision Energy Group Ltd | Construction | 2025 |
| Premier Cars Chichester Ltd | Transport & logistics | 2020 |
| Premier Compliance Solutions Limited | Construction | 2018 |
| Premier Hardham Ltd | Wholesale & retail | 2026 |
| Premier Shrubs Limited | Agriculture & fishing | 2007 |
| Premiere Refurbishments Limited | Construction | 2004 |
| Premium Management Services Ltd | Construction | 2025 |
| Prep 4 LET Limited | Professional & scientific | 2015 |
| Pressure Relief Plumbing Ltd | Construction | 2016 |
| Prestige Glow UK Ltd | Wholesale & retail | 2025 |
| Preston Barns Limited | Administrative & support | 2006 |
| Presura Investments Ltd | Real estate | 2023 |
| Preswylfa Holding Ltd | Financial services | 2024 |
| Pretty Nails an Ltd | Other services | 2023 |
| Pricebusters (Sussex) Ltd | Wholesale & retail | 2003 |
| Prickles Limited | Real estate | 2002 |
| Pridewatch Events Ltd | Construction | 2000 |
| Primal People Ltd | Hospitality | 2023 |
| Primary Windings Ltd | Manufacturing | 2023 |
| Primavera Land Care Ltd | Administrative & support | 2012 |
| Prime Tali Limited | Health & social care | 2025 |
| Primescape Group Ltd | Construction | 2025 |
| Primo Mortgage Services Ltd | Financial services | 2020 |
| Primrose Hill Residential Park Limited | Real estate | 2016 |
| Primus Electrical Solutions Ltd | Construction | 2025 |
| Prince Education Limited | Education | 2018 |
| Priority Carers Limited | Administrative & support | 2025 |
| Priority Insurance Brokers London Limited | Financial services | 2024 |
| Priors Residential Lettings Limited | Real estate | 2008 |
| Priory Close (Boxgrove) Limited | Households | 1983 |
| Priplus School of Motoring Ltd | Extraterritorial | 2024 |
| Prism Glassworks Ltd | Construction | 2016 |
| Privet Estate Ltd | Agriculture & fishing | 2012 |
| Pro-Active Business Information Limited | Professional & scientific | 1998 |
| Proact Ventures Limited | Professional & scientific | 2012 |
| Probuild Consulting Limited | Professional & scientific | 2013 |
| Proclean Hygienic Cleaning Services LLP | | 2010 |
| Procure Partnership Limited | Professional & scientific | 2025 |
| Prodrive Travel Ltd | Transport & logistics | 2020 |
| Product Design and Development Ltd | Professional & scientific | 2021 |
| Profanity Pots Ltd | Manufacturing | 2026 |
| Professional Plumbing and Tiling Limited | Construction | 2005 |
| Profile Graphic Design Limited | Manufacturing | 2003 |
| Progress Learning Limited | Administrative & support | 2005 |
| Progression Solutions Ltd | Professional & scientific | 2024 |
| Project 94 Ltd | Construction | 2018 |
| Project Bach Limited | Extraterritorial | 2024 |
| Project CPR Ltd | Wholesale & retail | 2023 |
| Project Express Ltd | Professional & scientific | 2008 |
| Project Management Consultant Services Ltd | Construction | 2023 |
| Project Management Plus Limited | Administrative & support | 2000 |
| Prok & Fitch Ltd | Information & communication | 2015 |
| Prolific Property Ltd | Real estate | 2017 |
| Promethean Planning Ltd | Professional & scientific | 2024 |