| Pharo Farm Ltd | Real estate | 2020 |
| Pharoah's Consulting Solutions Limited | Professional & scientific | 2025 |
| Phase 2 Projects Limited | Information & communication | 2023 |
| Phase One Electronics Limited | Manufacturing | 1987 |
| Phase One Holdings Limited | Manufacturing | 2002 |
| Phase Shift Solutions Limited | Financial services | 2024 |
| Phaseglass Ltd | Information & communication | 2026 |
| Phebeks Limited | Health & social care | 2016 |
| Phelen Associates Limited | Hospitality | 2005 |
| Phil Simons Decorating Limited | Construction | 2013 |
| Philbourne Limited | Households | 1973 |
| Philip Britton Medical Consulting Limited | Professional & scientific | 2017 |
| Philip Gibbs Insurance Brokers Limited | Financial services | 1989 |
| Philip Hill Limited | Real estate | 2022 |
| Philip Marazzi Photography Limited | Professional & scientific | 2014 |
| Phillips & SON (Alton) Limited | Real estate | 1930 |
| Phillips Carpentry Ltd | Manufacturing | 2024 |
| Phillips Roofing (Southern) Ltd | Construction | 2024 |
| Philtra Ltd | Extraterritorial | 2025 |
| PHO Mint Limited | Hospitality | 2025 |
| PHO NAM Torquay Limited | Hospitality | 2024 |
| Phoenix Builders Ltd | Construction | 2013 |
| Phoenix Corporation Group Limited | Wholesale & retail | 2023 |
| Phoenix Decorating Southern Limited | Construction | 2018 |
| Phoenix Expeditions Ltd | Education | 2025 |
| Phoenix Fuel Limited | Hospitality | 2026 |
| Phoenix Property Holdings Limited | Real estate | 2021 |
| Phoenix Removals Southern Limited | Transport & logistics | 2014 |
| Phone Tech-Tronics Ltd | Other services | 2024 |
| Phonics Digital Limited | Professional & scientific | 2025 |
| Phorslim Limited | Other services | 2010 |
| Phos Consult Ltd | Information & communication | 2022 |
| Photonova UK Ltd | Professional & scientific | 2005 |
| Phumie Ltd | Health & social care | 2026 |
| Pickleton Limited | Financial services | 2022 |
| Picknick Ltd | Manufacturing | 2009 |
| Picture Perfect Houses Limited | Real estate | 2016 |
| Picture Perfect Properties Limited | Real estate | 2012 |
| PIE Factory London Limited | Professional & scientific | 2023 |
| Piersons Spirit of Wine Consulting Ltd | Manufacturing | 2014 |
| Pigney Properties Limited | Real estate | 2018 |
| Pigney Property LLP | | 2023 |
| Pilates on TAP Ltd | Health & social care | 2020 |
| Pilgrams Plumbing Heating Services Ltd | Construction | 2019 |
| Pineapple Cactus Ltd | Information & communication | 2025 |
| Pineapple Events Solutions Limited | Manufacturing | 2016 |
| Pineapple Tots Childcare Limited | Health & social care | 2024 |
| Pinehurst Place Management Company Limited | Real estate | 2015 |
| Pinewood Business Solutions Limited | Information & communication | 2018 |
| Pinga Grill Limited | Hospitality | 2024 |
| Pink Kangaroo Property Limited | Real estate | 2023 |
| Pink Street Estate Agents Limited | Real estate | 2011 |
| Pink-Koala-Intl Ltd | Professional & scientific | 2023 |
| Pinkfoot Strategic Limited | Professional & scientific | 2023 |
| Pinnacle Building Limited | Construction | 2020 |
| Pinnacle Energy Group Ltd | Energy | 2022 |
| Pinnacle Fostering Ltd | Health & social care | 2019 |
| Pinnacle Insulations Limited | Construction | 2018 |
| PIPE2POWER Ltd | Construction | 2025 |
| Piql Limited | Information & communication | 2023 |
| Pique Associates Limited | Administrative & support | 2024 |
| Pisces Marine Equipment Ltd | Other services | 2010 |
| PIT Stop Autos JK Ltd | Wholesale & retail | 2025 |
| Pitt Hill Developments Limited | Construction | 2025 |
| Pivotal AC Limited | Construction | 2026 |
| Pixelstory UK Ltd | Wholesale & retail | 2025 |
| Pixelvine Software Ltd | Information & communication | 2025 |
| PJD Electrical Services Ltd | Construction | 2022 |
| PJH Collectables Limited | Arts & recreation | 2023 |
| PJH Electrical Services Ltd | Construction | 2018 |
| PJL Projects Limited | Professional & scientific | 2016 |
| PJM Group (Southern) Ltd | Financial services | 2016 |
| PJM Mechanical & Electrical Ltd | Construction | 2002 |
| PJM Risk Management Limited | Administrative & support | 2012 |
| PJS Interiors Limited | Construction | 2017 |
| Placeholder Solutions Limited | Financial services | 2025 |
| Planet Cruise Limited | Administrative & support | 2005 |
| Plasterwide Ltd | Construction | 2022 |
| Plastic Ideas Ltd | Professional & scientific | 2019 |
| Platinex(Eastleigh) Limited | Other services | 2022 |
| Platinum Developments (Southern) Ltd | Construction | 2023 |
| Platinum Property Management (Portsmouth) Limited | Households | 2024 |
| Platinum Restoration Flooring Ltd | Construction | 2021 |
| Platinum Restoration Limited | Construction | 2016 |
| Platinum Sports Ltd | Other services | 2025 |
| Play Cabanas Limited | Manufacturing | 2020 |
| Play Village Portsmouth Limited | Arts & recreation | 2021 |
| Playfair Digital Ltd | Information & communication | 2025 |
| Playmore Limited | Real estate | 1990 |
| Playrapp Limited | Other services | 2022 |
| Playzer Media Ltd | Professional & scientific | 2024 |
| PLC Property Limited | Real estate | 2010 |
| Plexigon Data Management Limited | Information & communication | 2011 |
| Plnge Ltd | Other services | 2025 |
| Plough Property Developments Limited | Construction | 2024 |
| Plumbcure GAS and Electricals Limited | Construction | 2017 |
| Plumbing 4 Drains Limited | Construction | 2026 |
| Plumeria Finance Ltd | Professional & scientific | 2025 |
| PM Interim Services Ltd | Professional & scientific | 2022 |
| PM03 Ltd | Construction | 2025 |