| Pangaea Media Limited | Professional & scientific | 2008 |
| Pani Barber Ltd | Other services | 2020 |
| Pani Swaff Limited | Financial services | 2018 |
| Pantheon-I Limited | Information & communication | 2025 |
| Parabellum Productions Ltd | Extraterritorial | 2021 |
| Paracount Limited | Professional & scientific | 2025 |
| Paratus Financial Limited | Professional & scientific | 2024 |
| Parchow Groundworks Limited | Construction | 2003 |
| Parchow Holdings Limited | Financial services | 2018 |
| Pargon Limited | Health & social care | 2003 |
| Parham Transport Limited | Transport & logistics | 2009 |
| Parhill Foundation Ltd | Health & social care | 2025 |
| Pariavia Logistics Limited | Transport & logistics | 2024 |
| Parker Solutions 4U Limited | Professional & scientific | 2018 |
| Parker-Hale Limited | Professional & scientific | 2001 |
| Parkes Films Ltd | Information & communication | 2006 |
| Parklands Management Company (Denmead) Limited | Real estate | 2018 |
| Parklands Medical Limited | Health & social care | 2019 |
| Parkside Accessories Limited | Manufacturing | 2005 |
| Parkwest Projects Ltd | Construction | 2012 |
| Partycloud Limited | Arts & recreation | 2018 |
| Pasha Portsmouth Ltd | Hospitality | 2016 |
| Pass Professional Qualifications Limited | Education | 2026 |
| Pass Time Driver Training Ltd | Education | 2023 |
| Passionate Healthcare Recruitment Limited | Other services | 2016 |
| Paterek Brickwork Limited | Construction | 2018 |
| Path (Holdings) Limited | Professional & scientific | 1999 |
| Pathway Training & Consultancy Ltd | Professional & scientific | 2012 |
| Patience Property Ltd | Real estate | 2022 |
| Patterson Digital Limited | Health & social care | 2018 |
| Patterson Restorative Solutions Limited | Other services | 2018 |
| Patterson Specialist Services Limited | Health & social care | 2018 |
| Paul and Rameshan PVT Limited | Health & social care | 2019 |
| Paul Anthony Transport Ltd | Transport & logistics | 2026 |
| Paul Beaves Consulting Limited | Administrative & support | 2018 |
| Paul Blake Properties Ltd | Real estate | 2012 |
| Paul Carter Urology Limited | Health & social care | 2019 |
| Paul Farris Events Limited | Other services | 2011 |
| Paul Hewett Reinstatement Ltd | Construction | 2010 |
| Paul Janes Associates Limited | Financial services | 2007 |
| Paul Merrett Holdings Limited | Financial services | 2020 |
| Paul Merrett Transport Limited | Transport & logistics | 2012 |
| Paul Padmore Consulting Ltd | Administrative & support | 2020 |
| Paul Tracey Property Services Ltd | Construction | 2014 |
| Paul Traill Mens Mentor Limited | Other services | 2025 |
| PAW Paradise Lovedean Ltd | Other services | 2026 |
| Pawsitively Pawfect Canine Services Limited | Extraterritorial | 2024 |
| Pawsitivetribe Ltd | Other services | 2021 |
| Pawsome Bowteeq Ltd | Wholesale & retail | 2025 |
| Paxton Hewitt Ltd | Information & communication | 2025 |
| Paxton Rise Limited | Construction | 2026 |
| PAY Day Made Easy Limited | Extraterritorial | 2017 |
| Payne Consulting Ltd | Information & communication | 2023 |
| Payne's Personnel Ltd | Construction | 2016 |
| Pbast Limited | Construction | 2019 |
| PBC Operations Limited | Administrative & support | 2012 |
| PBL Investment Limited | Financial services | 2012 |
| PBL Property Limited | Real estate | 2017 |
| PBO Solutions Limited | Information & communication | 2001 |
| PC Building Limited | Construction | 2005 |
| PC Resourcing Limited | Extraterritorial | 2024 |
| PCF Workforce Ltd | Transport & logistics | 2025 |
| Pcgs NO.1 Limited | Manufacturing | 2015 |
| PD Procurement Consultants Ltd | Professional & scientific | 2021 |
| PDL Southern Contracts Limited | Administrative & support | 2017 |
| PDT Solars Limited | Energy | 2024 |
| Peacehaven Limited | Real estate | 1997 |
| Peacock's Tail Limited | Manufacturing | 2023 |
| Peak Athletics Sports Limited | Wholesale & retail | 2024 |
| Peakperformancesouthampton Ltd | Wholesale & retail | 2026 |
| Pearl Mechanical Services Limited | Manufacturing | 2003 |
| Pearlescent Aesthetics Limited | Other services | 2023 |
| Pearsons Holdings Ltd | Professional & scientific | 2019 |
| Peas in a POD Consulting Limited | Administrative & support | 2016 |
| Pebbles Day Nursery (Farnborough) Ltd | Health & social care | 2011 |
| Pebeto Limited | Professional & scientific | 2018 |
| Pegasus Analytics Ltd | Information & communication | 2020 |
| Pegasus Builders (Petersfield) Limited | Construction | 1999 |
| Pegasus IFA Ltd | Professional & scientific | 2022 |
| PEJ Holdings Limited | Other services | 2025 |
| Pelham Group Holdings Limited | Manufacturing | 2016 |
| Pelham Healthcare Limited | Manufacturing | 2012 |
| Pelham Laboratories Limited | Wholesale & retail | 2020 |
| Pelican Cove Films Ltd | Information & communication | 2024 |
| Pelloby Cranes Ltd | Manufacturing | 2022 |
| Pelusa Health Ltd | Health & social care | 2015 |
| Pendulum Carpentry Limited | Construction | 2025 |
| Penny Burns Collection Limited | Arts & recreation | 2018 |
| Penny Court Limited | Real estate | 2006 |
| Penshurst Construction Ltd | Construction | 2023 |
| Penta Village Food Ltd | Hospitality | 2022 |
| Pentagon Plumbing & Heating Ltd | Construction | 2020 |
| Pentoprise Limited | Professional & scientific | 2013 |
| People ERA Limited | Administrative & support | 2025 |
| Peoplesolve Limited | Professional & scientific | 2002 |
| Percival Media Services Limited | Information & communication | 2024 |
| Perfect Finish Property Ltd | Construction | 2026 |
| Performance Associates Limited | Education | 2001 |
| Performers Theatre Company Limited | Arts & recreation | 2022 |
| Perkins Automotive Ltd | Wholesale & retail | 2016 |