| Phillips and Chaudhary Ltd | Health & social care | 2022 |
| Phlogiston Ltd | Health & social care | 2014 |
| Photini by Design Ltd | Professional & scientific | 2019 |
| Physically Free Ltd | Information & communication | 2026 |
| Physics Instrument Company Limited | Wholesale & retail | 1988 |
| Picardo Holdings Limited | Extraterritorial | 2025 |
| Pika Group Ltd | Information & communication | 2021 |
| Pikawiz Ltd | Information & communication | 2021 |
| Pilgrims Property Services Limited | Real estate | 2009 |
| Pimj Limited | Professional & scientific | 2025 |
| Pineapple Estates Limited | Professional & scientific | 2001 |
| Ping International Recruitment Ltd | Administrative & support | 2017 |
| Ping Lets Ltd | Real estate | 2024 |
| Ping Recruit Group Ltd | Administrative & support | 2018 |
| Pinnacle-Ap Ltd | Education | 2025 |
| Pipecatcher Films Ltd | Information & communication | 2018 |
| Pipers Wait Limited | Professional & scientific | 2014 |
| Pitman Pools Limited | Construction | 2014 |
| Pixel Blue Limited | Information & communication | 2017 |
| Pixel Engineering Services Ltd | Information & communication | 2023 |
| PJS One Limited | Real estate | 2018 |
| PJS Two Limited | Wholesale & retail | 2018 |
| PKB Materials Limited | Wholesale & retail | 2020 |
| Plastercraft (Salisbury) Ltd | Construction | 2025 |
| Plastrad Limited | Administrative & support | 2021 |
| Platinum Business Management Limited | Information & communication | 2002 |
| Playgroundgolf Ltd | Arts & recreation | 2025 |
| Playmar Media Ltd | Professional & scientific | 2020 |
| Plush Interior Designs Limited | Agriculture & fishing | 2018 |
| PMJ Civils Ltd | Construction | 2024 |
| Pneumorator Limited | Manufacturing | 2025 |
| Point Building Solutions Ltd | Administrative & support | 2017 |
| Polycatuk Ltd | Manufacturing | 2017 |
| Poplar (Romsey) Limited | Construction | 2018 |
| Portcullis Doors and Windows Limited | Administrative & support | 2022 |
| Portcullis Garden Services Ltd | Arts & recreation | 2019 |
| Portersbridge Mews Limited | Households | 2020 |
| Positearth Ltd | Hospitality | 2021 |
| Positively YOU Limited | Health & social care | 2018 |
| Positronetic Ltd | Health & social care | 2026 |
| PPS (Southern) Ltd | Real estate | 2022 |
| Praetor Systems Ltd | Professional & scientific | 2026 |
| Precision Bariatrics Limited | Health & social care | 2023 |
| Premium Feeds Limited | Agriculture & fishing | 2001 |
| Prescient Accounting Limited | Professional & scientific | 2016 |
| Prestige Apartments Letting Company Limited | Real estate | 2002 |
| Prestige Automotive Ltd | Construction | 2018 |
| Prestige Warranty Limited | Other services | 2024 |
| Prickly Limited | Wholesale & retail | 2024 |
| Primary Access Holdings Limited | Financial services | 2017 |
| Primary Access Limited | Health & social care | 2010 |
| Primary Colour Holdings Ltd | Financial services | 2022 |
| Prime 109 Limited | Administrative & support | 2021 |
| Prime Plumbing and Heating (South) Ltd | Construction | 2020 |
| Prime Sedation Limited | Health & social care | 2020 |
| Primetime Play Limited | Administrative & support | 2016 |
| Princes Court Residents RTM Company Ltd | Households | 2018 |
| Priory Investments Group Ltd | Construction | 2017 |
| Pro Fabrication Ltd | Manufacturing | 2022 |
| Pro-Set Formulated Resin Systems UK Ltd | Financial services | 2025 |
| Pro-Voice Limited | Real estate | 2011 |
| Pro-Voice Network Limited | Information & communication | 2007 |
| Proaction Creative Ltd | Information & communication | 2007 |
| Proaction Media Ltd | Information & communication | 2021 |
| Profile Tyres Ltd | Wholesale & retail | 2024 |
| Proline Lettings Ltd | Real estate | 2022 |
| Pronto Medicolegal Services Limited | Health & social care | 2025 |
| Properties TT Ltd | Real estate | 2018 |
| Property Focus Photographic Services Ltd | Professional & scientific | 2018 |
| Property Sourcing Squad Ltd | Administrative & support | 2023 |
| Property Spine Ltd | Real estate | 2020 |
| Propex Heating and Leisure Ltd | Wholesale & retail | 1987 |
| Propools Limited | Extraterritorial | 2012 |
| Propure Limited | Wholesale & retail | 2011 |
| Proseptic Limited | Water & waste | 2013 |
| Prospect House WN60TU RTM Company Ltd | Households | 2017 |
| Proud Mary (Southampton and Southwest) Ltd | Hospitality | 2024 |
| Provenproud Limited | Professional & scientific | 1989 |
| Prudentia Legal Limited | Professional & scientific | 2026 |
| PSB Steel Erecting Limited | Construction | 2012 |
| Psychological Assessment and Therapies Limited | Health & social care | 2000 |
| PTP Trustees Limited | Professional & scientific | 2017 |
| Pure Aqua Window Cleaning Ltd | Administrative & support | 2019 |
| Pure Digital Commerce Group Limited | Wholesale & retail | 2022 |
| Pure Digital Commerce Limited | Wholesale & retail | 2016 |
| Pure Safety 2023 Limited | Financial services | 2023 |
| Pure Safety Incentives Limited | Financial services | 2023 |
| Pure Safety Investco Limited | Financial services | 2017 |
| Pure Salon Limited | Other services | 2009 |
| Pureheat Hampshire Ltd | Construction | 2014 |
| Puremed Ltd | Wholesale & retail | 2010 |
| Purevision Limited | Real estate | 1990 |
| Purple Hawk Limited | Administrative & support | 2007 |
| PV Plus Limited | Construction | 2012 |
| Q&E Property Limited | Real estate | 2025 |
| Q6 Holdings Ltd | Financial services | 2016 |
| Qbis UK Ltd | Wholesale & retail | 2006 |
| Qixsoft Limited | Information & communication | 2002 |
| QLF Medical Limited | Health & social care | 2018 |
| Qronicle Ltd | Information & communication | 2026 |