| PJM Decorating Services Ltd | Construction | 2024 |
| PJP Systems Limited | Professional & scientific | 2011 |
| PKR Productions Limited | Information & communication | 2023 |
| Planet Safe Packaging Ltd | Administrative & support | 2025 |
| Planetoid Studio Ltd | Information & communication | 2024 |
| Platinum Privacy Ltd | Information & communication | 2021 |
| Ploy & PIM Limited | Hospitality | 2018 |
| Pluggedin Agncy Ltd | Manufacturing | 2026 |
| Plumlink Plumbing Supplies Ltd | Wholesale & retail | 2016 |
| PM Pharm Ltd | Health & social care | 2025 |
| PMI Property Developments Ltd | Real estate | 2021 |
| Pol-Mal Ltd | Construction | 2019 |
| Polisrepair Ltd | Hospitality | 2021 |
| Politics News Ltd | Information & communication | 2024 |
| Pollito Loco Ltd | Hospitality | 2022 |
| Pomodroizer Ltd | Information & communication | 2014 |
| Pompey Barbershop Ltd | Other services | 2025 |
| Pompey Blues Ltd | Wholesale & retail | 2025 |
| Pompey Cars Limited | Administrative & support | 2014 |
| Pompey Developments Limited | Construction | 2025 |
| Pompey Food Store Ltd | Wholesale & retail | 2025 |
| Pompey Plumb Ltd | Construction | 2019 |
| Pompey Properties Limited | Real estate | 2020 |
| Pompey Strong Island Ltd | Wholesale & retail | 2020 |
| Poolhouse Studios Limited | Professional & scientific | 2022 |
| Poolside by B Limited | Wholesale & retail | 2023 |
| Popa Building Works Ltd | Construction | 2020 |
| Port Saver Limited | Wholesale & retail | 2020 |
| Port Solent Valeting Centre Ltd | Administrative & support | 2020 |
| Port/Whyte & Sons PUB Company Ltd | Hospitality | 2023 |
| Portchester Property Development Ltd | Construction | 2021 |
| Portclean Ltd | Administrative & support | 2022 |
| Portofino Charters (Mallorca) Ltd | Arts & recreation | 2025 |
| Portsea Services Limited | Other services | 2022 |
| Portsmouth Cars Ltd | Administrative & support | 2026 |
| Portsmouth Catering Limited | Hospitality | 2026 |
| Portsmouth Cycle Exchange Limited | Wholesale & retail | 2024 |
| Portsmouth Film Society CIC | Information & communication | 2016 |
| Portsmouth Flooring Ltd | Wholesale & retail | 2021 |
| Portsmouth Foodguide Ltd | Arts & recreation | 2023 |
| Portsmouth Marine Training Ltd | Education | 2025 |
| Portsmouth Martial Arts Limited | Arts & recreation | 2025 |
| Portsmouth Nails & Spa Ltd | Other services | 2025 |
| Portsmouth Outdoor Fitness Limited | Arts & recreation | 2018 |
| Portsmouth Student Lets Limited | Real estate | 1995 |
| Portsmouth Transport Solutions Limited | Wholesale & retail | 2024 |
| Portum Domos Limited | Real estate | 2019 |
| Positive Eats Ltd | Manufacturing | 2021 |
| Positive Visible Results Limited | Professional & scientific | 2015 |
| Pouches&More Limited | Wholesale & retail | 2025 |
| Pounds Consultants Ltd | Professional & scientific | 2021 |
| PPK Business Consulting Ltd | Professional & scientific | 2025 |
| PR Delivery UK Ltd | Transport & logistics | 2019 |
| PR Property Investors Limited | Real estate | 2022 |
| Pradeep Subramanian Limited | Administrative & support | 2019 |
| Precise Superservices Ltd | Wholesale & retail | 2013 |
| Premier Standard Ltd | Transport & logistics | 2025 |
| Premium Steaks Limited | Hospitality | 2025 |
| Prestige Hire Cars (Hampshire) Limited | | 1971 |
| Preview Boutique Ltd | Wholesale & retail | 2017 |
| Prime Access Scaffolding South Ltd | Construction | 2021 |
| Prime Barbers Ltd | Other services | 2024 |
| Prime Portsmouth Ltd | Administrative & support | 2025 |
| Prime Position Ltd | Wholesale & retail | 2016 |
| Primrose Freehold Limited | Households | 2017 |
| Primus Trading Ltd | Wholesale & retail | 2023 |
| Principle Paraplanning Limited | Public administration | 2018 |
| Printx Publishing Limited | Information & communication | 2026 |
| Priory Properties Portsmouth Limited | Real estate | 2017 |
| Prism Card Co Limited | Wholesale & retail | 2026 |
| Prize Professionals Ltd | Other services | 2022 |
| Procare Staffing Solutions Ltd | Administrative & support | 2026 |
| Proexpert Group Ltd | Construction | 2019 |
| Professionalconsultantuk Ltd | Professional & scientific | 2025 |
| Profitiva Limited | Professional & scientific | 2023 |
| Progress Nutrition Limited | Extraterritorial | 2007 |
| Project 69 Limited | Hospitality | 2019 |
| Project Lettings Ltd | Real estate | 2025 |
| Prome Introducer Ltd | Construction | 2024 |
| Prominent Mortgage Services Limited | Financial services | 2024 |
| Prop DOT FI Limited | Information & communication | 2025 |
| Proper JOB Handyman Ltd | Construction | 2026 |
| Proper T Properties Limited | Households | 2021 |
| Property Challenge Ltd | Real estate | 2022 |
| Property Management Care Ltd | Households | 2024 |
| Proserve Building Solutions Ltd | Construction | 2012 |
| Prostar Cleaning Ltd | Administrative & support | 2015 |
| Proteus Ltd | Administrative & support | 2016 |
| Provide Homes Projects Ltd | Construction | 2026 |
| Prusec Ltd | Information & communication | 2024 |
| Pure DRY Cleaning (Alton) Ltd | Other services | 2020 |
| Pure Ground Milton C.I.C. | Hospitality | 2012 |
| Purple Mango Portsmouth Ltd | Hospitality | 2016 |
| PV Developments Limited | Real estate | 2017 |
| PVD Holdings Limited | Financial services | 2025 |
| PVD1 Limited | Construction | 2017 |
| PVD2 Limited | Real estate | 2017 |
| PYN Limited | Professional & scientific | 2023 |
| Pyylon Ltd | Information & communication | 2024 |
| Qcommercial Services Ltd | Construction | 2025 |