| Paving 2 Point Landscapes Limited | Construction | 2025 |
| Pavingpav Limited | Construction | 2014 |
| Pawesome Parks Ltd | Arts & recreation | 2024 |
| Pawfamstar Ltd | Other services | 2024 |
| Pawlak Marine Ltd | Professional & scientific | 2023 |
| Pawlina Transport Ltd | Transport & logistics | 2025 |
| Pawsandpacks Ltd | Wholesale & retail | 2024 |
| Pawsome Puppies Ltd | Agriculture & fishing | 2024 |
| Pawtapoo Limited | Wholesale & retail | 2026 |
| Pawty Time Ltd | Wholesale & retail | 2025 |
| Paxton Court Flats Limited | Households | 2004 |
| Paxtons Living Limited | Real estate | 2022 |
| PAY Southampton Limited | Wholesale & retail | 2026 |
| PAY Sync Ltd | Professional & scientific | 2023 |
| Payflow (Nurslink) Ltd | Administrative & support | 2024 |
| Payflow Group Ltd | Professional & scientific | 2022 |
| Payflow Ltd | Administrative & support | 2014 |
| Paymark Solutions Limited | Administrative & support | 2011 |
| PB Europe Limited | Wholesale & retail | 2021 |
| PB Outsource Limited | Administrative & support | 2012 |
| PB PUB Co Ltd | Hospitality | 2025 |
| PB Renovation Ltd | Construction | 2023 |
| PBH Construction Ltd | Construction | 2020 |
| PBH Logistics Ltd | Transport & logistics | 2010 |
| PBK Civils and Utilities Limited | Water & waste | 2025 |
| PBK Squared Ltd | Construction | 2014 |
| PBP System Analysis Limited | Information & communication | 2013 |
| Pbrsa Ltd | Financial services | 2024 |
| PBS4 | Health & social care | 2014 |
| PBS4 U.K. Limited | Health & social care | 2023 |
| PC Accountancy Services Ltd | Professional & scientific | 2022 |
| PC Building Supplies Limited | Wholesale & retail | 2003 |
| PC Holdco Limited | Financial services | 2024 |
| PC Motor Group (Holdings) Limited | Wholesale & retail | 2015 |
| PC Piper Limited | Other services | 2020 |
| PCA Audio Services Limited | Information & communication | 2022 |
| PCE Instruments UK Limited | Manufacturing | 2011 |
| PCI Healthcare Ltd | Health & social care | 2024 |
| PCK Electrical Hampshire LLP | | 2016 |
| PCL Cleaning Ltd | Financial services | 2024 |
| PCM Solar Limited | Construction | 2018 |
| PCS Holdco Limited | Financial services | 2020 |
| PCT Productions Ltd | Information & communication | 2022 |
| PCW Technology Limited | Manufacturing | 2010 |
| PDH Engineering Services Limited | Construction | 2014 |
| PDH Fuels Ltd | Wholesale & retail | 2026 |
| PDL Logistics Ltd | Transport & logistics | 2016 |
| Pdmmsp Ltd | Information & communication | 2026 |
| Pdsj Ltd | Hospitality | 2019 |
| PDW Trading Limited | Arts & recreation | 2015 |
| Peaberry Coffee Company Limited | Wholesale & retail | 2015 |
| Peace Fighter Ltd | Wholesale & retail | 2025 |
| Peace of Mind Care Ltd | Health & social care | 2013 |
| Pead Pritchard Properties Ltd | Real estate | 2025 |
| Peak Health Consultants LLP | | 2025 |
| Peak Remedial Limited | Other services | 2020 |
| Pear Tree House Rehabilitation Limited | Health & social care | 1996 |
| Pearcroft Civil Engineering Ltd | Administrative & support | 2024 |
| Pearl EYE Limited | Professional & scientific | 2016 |
| Pearl Marine Ltd | Professional & scientific | 2023 |
| Pearl Nurzing Limited | Extraterritorial | 2023 |
| Pearlco Limited | Hospitality | 2019 |
| Pearls Property’S Limited | Real estate | 2021 |
| Pearlsoy Limited | Professional & scientific | 2026 |
| Peartree Construction Limited | Construction | 2019 |
| Peat Moss Homes Limited | Real estate | 2019 |
| Pebble Health and Beauty Ltd | Other services | 2023 |
| Pedal Group UK Limited | Financial services | 2022 |
| Pedro Clover Properties Ltd | Real estate | 2026 |
| Peermont Limited | Health & social care | 2022 |
| Pegasus Cruise Parking Ltd | Hospitality | 2021 |
| Pegasus Home Care Ltd | Health & social care | 2024 |
| Pegasus Total Homecare Ltd | Administrative & support | 2013 |
| Pegmar Holdings Limited | Financial services | 2023 |
| Pegmar Limited | Health & social care | 2002 |
| PEI FEN Fine Art Limited | Other services | 2005 |
| Peladale Limited | | 1978 |
| Pelagic Expeditions Limited | Other services | 2016 |
| Pelasgos Limited | Wholesale & retail | 2023 |
| Pelatec Ltd | Professional & scientific | 2025 |
| Pelican Business Insurance Services Limited | Financial services | 2017 |
| Pelican Construction Limited | Construction | 2024 |
| Pelleas Homes M5CS Ltd | Construction | 2025 |
| PEM International Associates Limited | Professional & scientific | 2014 |
| Pemberton Optics Ltd | Health & social care | 2008 |
| Pemepa Ltd | Information & communication | 2020 |
| PEN Your Comms Limited | Professional & scientific | 2019 |
| Penallta Films Ltd | Information & communication | 2007 |
| Penco Builders Ltd | Construction | 2013 |
| Pencon Construction & Surveying Ltd | Construction | 2017 |
| Pendower Real Estate Limited | Real estate | 2021 |
| Pendulum Gym Ltd | Arts & recreation | 2025 |
| Penelope (Bursledon) Management Company Limited | Households | 1983 |
| Penelope G Ltd | Real estate | 2021 |
| Penetra Consulting Limited | Professional & scientific | 2016 |
| Penguin Foods Limited | Manufacturing | 2020 |
| Penidraw Limited | Professional & scientific | 1991 |
| Peninsula Investments Limited | Real estate | 2011 |
| Pennington Property Holdings Limited | Real estate | 2017 |
| Penny Consultancy Limited | Health & social care | 2010 |