| Passpets Ltd | Professional & scientific | 2021 |
| Pastel House Investments Limited | Real estate | 2025 |
| Paul's Investment 1964 Limited | Extraterritorial | 2015 |
| Payne Home Ltd | Professional & scientific | 2022 |
| PB Railway Services Ltd | Construction | 2019 |
| Pdmm Property Ltd | Real estate | 2026 |
| PDP Architecture LLP | | 2003 |
| PDP Limited | Professional & scientific | 2009 |
| PE Hampshire Limited | Hospitality | 2018 |
| Pearlico Limited | Hospitality | 2025 |
| Pebble and Pine Escapes Ltd | Real estate | 2025 |
| Peck and Strong Limited | Manufacturing | 2002 |
| Peck Property’S Ltd | Real estate | 2026 |
| Peking Taste Limited | Real estate | 1999 |
| Penguin Refrigeration Limited | Wholesale & retail | 2001 |
| People Capability & Skills Academy Ltd | Professional & scientific | 2026 |
| Peter Huffer Dairies Ltd | Wholesale & retail | 2010 |
| PFM Fitness Ltd | Other services | 2022 |
| Phase Site Investigations Limited | Construction | 2007 |
| Phoenix Surveying Ltd | Construction | 2019 |
| Physique Management Company Limited | Administrative & support | 1998 |
| PI Contract Services Ltd | Professional & scientific | 2015 |
| Piesik Limited | Construction | 2018 |
| PII Property Limited | Real estate | 2012 |
| Piloquot Limited | Health & social care | 2024 |
| Pinecourt Limited | Health & social care | 2012 |
| Pinklane Limited | Real estate | 2009 |
| Pinnacle & Pine Limited | Financial services | 2025 |
| Piplo Ltd | Professional & scientific | 2019 |
| PIQ Travel Ltd | Transport & logistics | 2019 |
| Pizza Tudor Italiano Express Limited | Hospitality | 2025 |
| PK Cargo Services Limited | Transport & logistics | 2020 |
| PKB Transport Ltd | Administrative & support | 2021 |
| Planet 9 Design Ltd | Construction | 2020 |
| Planning Solutions Consulting Limited | Professional & scientific | 2005 |
| PM Squared Limited | Professional & scientific | 2007 |
| Poets Day Ltd | Construction | 2025 |
| Pomerak Ventures Ltd | Wholesale & retail | 2024 |
| Portsmouth & Capital Limited | Real estate | 2007 |
| Portsmouth Print Limited | Manufacturing | 2026 |
| Portsmouth Surgical Holdings Limited | Professional & scientific | 2008 |
| Portsmouth Tarantulas Limited | Agriculture & fishing | 2019 |
| Portsmouth Water Holdings Limited | Administrative & support | 2002 |
| Portsmouth Water Limited | Water & waste | 1990 |
| Portsvista Limited | Professional & scientific | 2013 |
| Poseidon Pro Clean Ltd | Administrative & support | 2025 |
| Positive Angle Limited | Manufacturing | 2005 |
| POTS2DISHFOODS CIC | Wholesale & retail | 2025 |
| Power & Installation Holdings Ltd | Financial services | 2012 |
| Power & Installation Limited | Administrative & support | 2006 |
| PR Electrics Ltd | Construction | 2014 |
| Prabh Saini Fitness Ltd | Transport & logistics | 2017 |
| Precision Products (Portsmouth) Limited | Manufacturing | 2000 |
| Premier Middle Parkway Limited | Wholesale & retail | 2022 |
| Prestige Worldwide Online Ltd | Wholesale & retail | 2022 |
| Printer Graphics Ltd | Manufacturing | 2010 |
| PRK Building Services Ltd | Construction | 2019 |
| Pro DEC Team Limited | Construction | 2018 |
| Pro TM Ltd | Manufacturing | 2023 |
| Promech Garage Services Limited | Wholesale & retail | 2014 |
| Promised Heritage Ltd | Hospitality | 2025 |
| Provectus IT Limited | Information & communication | 2020 |
| Proxima Solutions Ltd | Information & communication | 2010 |
| Psecc Ltd | Administrative & support | 2017 |
| PSG Grill Ltd | Hospitality | 2025 |
| Public Sector Limited | Professional & scientific | 2024 |
| Pure Peaks Ltd | Hospitality | 2026 |
| Purenest Care Ltd | Health & social care | 2026 |
| PWP Architects Limited | Professional & scientific | 2000 |
| Pystrap Technologies Ltd | Information & communication | 2023 |
| PZ Properties Ltd | Real estate | 2023 |
| QR Trails Ltd | Information & communication | 2025 |
| Qsek Solutions Ltd | Professional & scientific | 2023 |
| Quality Living Path Ltd | Professional & scientific | 2025 |
| Quantum Management Services Ltd | Construction | 2015 |
| Quantum Origination Limited | Financial services | 2012 |
| R & D Roofing Contractors Ltd | Construction | 2017 |
| R Jurd Holdings Limited | Professional & scientific | 2010 |
| R M (Rotary) Holdings Ltd | Wholesale & retail | 2023 |
| R.A.Vine (Engineering) Limited | Administrative & support | 1962 |
| R2 Construction & Roofing Ltd | Construction | 2026 |
| RAA Carpentry Ltd | Manufacturing | 2026 |
| Rachel Parham Design Limited | Manufacturing | 2020 |
| Radio Carpati Ltd | Information & communication | 2020 |
| Rafal Delivery Ltd | Transport & logistics | 2024 |
| Rahi's Restaurant Limited | Hospitality | 2021 |
| Rasda Energy Design Consultancy Ltd | Professional & scientific | 2018 |
| Raya Clinic Ltd | Other services | 2012 |
| Raylen Ltd | Real estate | 2023 |
| Raymara Projects Limited | Construction | 2017 |
| RDF Electrical and Mechanical Engineering Ltd | Manufacturing | 2024 |
| React Fit Ltd | Arts & recreation | 2017 |
| Rebel Wave Productions Ltd | Information & communication | 2019 |
| Red Chilli Havant Ltd | Hospitality | 2019 |
| Red Gray Limited | Manufacturing | 2017 |
| Referrio Limited | Real estate | 2019 |
| Regency Senior Living Limited | Health & social care | 2025 |
| Regent Engineering Ltd | Manufacturing | 2024 |
| Regis Healthcare PCN Ltd | Health & social care | 2024 |
| Reinelt Limited | Financial services | 2010 |