| Pall Manufacturing UK Limited | Manufacturing | 1963 |
| Pall Technology UK Limited | Professional & scientific | 2013 |
| Pallard Roofing Ltd | Construction | 2023 |
| Pallet Brothers Limited | Water & waste | 2021 |
| Palm Court RTM Company Limited | Households | 2011 |
| Palm Fleet Limited | Administrative & support | 2025 |
| Palm Z Properties Ltd | Households | 2022 |
| Palmer Downs Property Limited | Households | 2018 |
| Palmer Properties Southern Limited | Real estate | 2023 |
| PAM Worldwide Limited | Administrative & support | 2009 |
| Pamina Yachts Ltd | Hospitality | 2018 |
| Pan's Lodge Interior Design Limited | Other services | 2006 |
| Pan-Pacific Logistics (UK) Limited | Wholesale & retail | 2012 |
| Panclad Services Ltd | Administrative & support | 2013 |
| Pandajai Ltd | Hospitality | 2025 |
| Pandorum Ltd | Administrative & support | 2018 |
| Panini Junction Ltd | Hospitality | 2024 |
| Panormus Street Food Limited | Hospitality | 2019 |
| Pantheon Group Holdings Limited | Financial services | 2018 |
| Panther Management Limited | Real estate | 2002 |
| Panther Technology Ltd | Information & communication | 2016 |
| Panzano Limited | Transport & logistics | 1991 |
| Paper CUT Studio LLP | | 2026 |
| Paper Tech UK Ltd | Manufacturing | 1997 |
| Paprika Farnborough Limited | Hospitality | 2015 |
| Paqualyte Ltd | Water & waste | 2020 |
| Parachute.Io Ltd | Information & communication | 2014 |
| Paraffin Ltd | Financial services | 2017 |
| Paragon Advance Ltd | Professional & scientific | 1998 |
| Paragon Marketing Projects Ltd | Professional & scientific | 2017 |
| Paragon Planning and Developments Limited | Real estate | 2025 |
| Paramount K9 Training and Fitness Ltd | Other services | 2024 |
| Parasca Ltd | Transport & logistics | 2016 |
| Paratus Heating Limited | Construction | 2026 |
| Parchment Residents Association Limited(The) | Other services | 1986 |
| Pardus Consulting Ltd | Professional & scientific | 2019 |
| Parham Removals Limited | Transport & logistics | 2012 |
| Parish Services Ltd | Information & communication | 2023 |
| Parity Trust Limited | Financial services | 2000 |
| Park Lane Properties & Developments Limited | Construction | 2023 |
| Park Lane Assets (Development) Ltd | Extraterritorial | 2017 |
| Park Royal Flat Management (Portsmouth) Limited | Households | 1975 |
| Park View (Portsmouth) Residents Association Limited | Professional & scientific | 1991 |
| Parker Cleaning Service Ltd | Administrative & support | 2025 |
| Parking Safe Ltd | Hospitality | 2024 |
| Parklang Developments Limited | Construction | 2010 |
| Parnell Holdings (South) Limited | Financial services | 2022 |
| Parnell Land Co. Limited | Real estate | 2017 |
| Parnell Perioperative Ltd | Health & social care | 2026 |
| Parnells Food Outlets Limited | Hospitality | 2019 |
| Parronda Court Freehold Limited | Households | 2014 |
| Parsons SON & Basley Management Limited | Real estate | 2026 |
| Parsons SON & Basley Property Agents Limited | Real estate | 2026 |
| Part Exchange Vans Limited | Wholesale & retail | 2019 |
| Partners PX Ltd | Administrative & support | 2023 |
| Party PUG Ltd | Professional & scientific | 2025 |
| Paruk Building Services Ltd | Construction | 2023 |
| Passionate Peculiar Care Limited | Health & social care | 2020 |
| Passiton Consultancy Ltd | Professional & scientific | 2017 |
| Passtime Europe Limited | Wholesale & retail | 2010 |
| PAT and Sons Limited | Health & social care | 2014 |
| Patecs Technologies (Portsmouth Tech and Cultural Hub) CIC | Information & communication | 2025 |
| Paternoster ROW Winchester Limited | Households | 1987 |
| Paton Welding UK Ltd | Wholesale & retail | 2025 |
| Patrick Mackenna Ltd | Information & communication | 2016 |
| Patrick Marks Media Limited | Information & communication | 2020 |
| Paul Harrop Cars Limited | Wholesale & retail | 2025 |
| Paul Harrop Property Limited | Real estate | 2025 |
| Paul Joy Engineering Limited | Professional & scientific | 2014 |
| Paul Marchbank Consultancy Ltd | Professional & scientific | 2023 |
| Paul Miles Electrical Limited | Construction | 2010 |
| Paul Onions Plumbing Limited | Construction | 2013 |
| Paul Salt Solutions Limited | Professional & scientific | 2018 |
| Paul Sherry Consulting Limited | Professional & scientific | 2011 |
| Paul Stilwell Limited | Professional & scientific | 2011 |
| Paul Watling Estates Limited | Other services | 2016 |
| Paul's Furniture Ltd | Wholesale & retail | 2017 |
| Paul's Village Dairy Limited | Wholesale & retail | 2015 |
| Paul.Smithlifting Solutions Limited | Construction | 2017 |
| Pauline Macarons Ltd | Manufacturing | 2026 |
| Paulley's Taxation Ltd | Professional & scientific | 2017 |
| Paulmant Services Limited | Construction | 2014 |
| Paulsgrove and Wymering Community Action Board Ltd | Health & social care | 2006 |
| Paul`S Property Services Limited | Construction | 2009 |
| Pavenholt Digital Limited | Information & communication | 2025 |
| Paverley Technology Limited | Information & communication | 2025 |
| Paving Perfection Limited | Other services | 2013 |
| Paving Scapes Ltd | Construction | 2025 |
| Pavolera Technology Limited | Information & communication | 2024 |
| Pawa Ltd | Wholesale & retail | 2020 |
| Payra Real Estate UK Limited | Real estate | 2025 |
| Payright CIS Ltd | Construction | 2025 |
| Payroll Masters Limited | Professional & scientific | 2025 |
| PB Installations Limited | Construction | 2002 |
| PB Project Solutions Ltd | Professional & scientific | 2024 |
| Pbsf Ventures Limited | Other services | 2026 |
| PC Solutions (UK) Limited | Information & communication | 2001 |
| PCP Highlands LLP | | 2005 |
| PD and LJ Brigg Limited | Health & social care | 2012 |
| PDC Contract Decorators Limited | Construction | 2004 |