| Polytime International Limited | Wholesale & retail | 1997 |
| POM Bear and MOO House Ltd | Wholesale & retail | 2025 |
| Pompi Construct Limited | Transport & logistics | 2008 |
| Ponantt LLP | | 2023 |
| Pontem Property Rentals Ltd | Real estate | 2021 |
| Pontio Group Ltd | Information & communication | 2025 |
| Ponzo Counselling Ltd | Health & social care | 2020 |
| Poodles & Poms Limited | Agriculture & fishing | 2025 |
| Poomani Ltd | Wholesale & retail | 2025 |
| Poone Holding Investment Ltd | Real estate | 2021 |
| POP GAS Ltd | Transport & logistics | 2021 |
| POP UP Global Limited | Arts & recreation | 2017 |
| POP UP Projects CIC | Education | 2011 |
| Popa Swift Logistics Ltd | Transport & logistics | 2024 |
| Popcorn Paws Ltd | Manufacturing | 2024 |
| Popflor Trans Ltd | Transport & logistics | 2022 |
| Popistasu M Limited | Construction | 2026 |
| Poplars Close (Hannington) Management Limited | Households | 2009 |
| Popovich Tech Ltd | Information & communication | 2026 |
| Poppet Parties Ltd | Administrative & support | 2025 |
| Poppetts Limited | Administrative & support | 2002 |
| Poppies - Peak District Limited | Information & communication | 2005 |
| Poppins Pantry Ltd | Manufacturing | 2019 |
| Poppy Design Studio & Marketing Ltd | Manufacturing | 2022 |
| Poppy Eco Hub Ltd | Information & communication | 2024 |
| Popski's Private Expeditions Ltd | Administrative & support | 2025 |
| Popular Shop Limited | Wholesale & retail | 2023 |
| Port Taxi Limited | Transport & logistics | 2026 |
| Portbay Management Solutions Limited | Administrative & support | 2012 |
| Porters Executive Travel Ltd | Transport & logistics | 2015 |
| Portfutures Africa Limited | Construction | 2024 |
| Portfutures International Corridors Limited | Mining & quarrying | 2023 |
| Portland Design Limited | Construction | 2020 |
| Portland Road (Rushden) "a" Limited | Households | 1988 |
| Portland Road (Rushden) "B" Limited | Households | 1988 |
| Portland ST Ltd | Hospitality | 2022 |
| Portman Brokerage Limited | Financial services | 2022 |
| Portman Business Finance Limited | Financial services | 2023 |
| Portman Commercial Finance Limited | Financial services | 2016 |
| Portman Finance Group Ltd | Financial services | 2020 |
| Portman Financial Services Limited | Financial services | 2022 |
| Portman Holdco Limited | Financial services | 2025 |
| Portman Leasing Limited | Administrative & support | 2009 |
| Portman Operations Limited | Financial services | 2020 |
| Portman Property & Lettings Ltd | Real estate | 2015 |
| Portobello Art Limited | Wholesale & retail | 1992 |
| Portrait Technology Limited | Information & communication | 2021 |
| Portsmere Construction Limited | Construction | 2016 |
| Portstone Close (1996) Limited | Households | 1996 |
| POS Consultancy Ltd | Professional & scientific | 2019 |
| Pose Fitness Limited | Arts & recreation | 2018 |
| Posh Truly Ltd. | Hospitality | 2022 |
| Posh Windows UK Ltd | Manufacturing | 2014 |
| Positive Direction Ltd | Real estate | 2026 |
| Positive Psychology for Life Ltd | Professional & scientific | 2024 |
| Positivotransport Ltd | Transport & logistics | 2024 |
| Possibilis Cloud Limited | Information & communication | 2024 |
| Poste Pro Ltd | Construction | 2019 |
| Postworks Limited | Manufacturing | 2015 |
| Potcovaru Trans Ltd | Transport & logistics | 2018 |
| Potor UK Limited | Hospitality | 2017 |
| Pottbar Ltd | Hospitality | 2024 |
| Potter & Co. Global Ltd | Administrative & support | 2014 |
| Pottermann Integrated Services Ltd | Real estate | 2017 |
| Pottersmark Limited | Administrative & support | 2023 |
| Potz Ceramic Studio Ltd | Wholesale & retail | 2020 |
| Poulomi Technology Ltd | Information & communication | 2025 |
| Poulsen Skone & Company Limited | Extraterritorial | 1963 |
| Pounden Limited | Real estate | 2021 |
| Powdertree Limited | Real estate | 1982 |
| Powell Phonics Ltd | Education | 2023 |
| Power 2 Progress Limited | Other services | 2013 |
| Power Horse Haulage Ltd | Transport & logistics | 2021 |
| Power Impulse Ltd | Wholesale & retail | 2018 |
| Power TAN (Holdings) Ltd | Wholesale & retail | 2024 |
| Powerdata Properties Ltd | Real estate | 2025 |
| Powerdata Technologies Limited | Wholesale & retail | 2006 |
| Powered Solutions Ltd | Wholesale & retail | 2018 |
| Powerex UK Limited | Manufacturing | 1999 |
| Powerful Plant and Truck Hire Ltd | Transport & logistics | 2024 |
| Powerful Tools Ltd | Extraterritorial | 2013 |
| Powerful Voices Ltd | Health & social care | 2018 |
| Powerhouse Consultancy Limited | Professional & scientific | 2024 |
| Powerhouse Property Group Ltd | Real estate | 2022 |
| Powersaver (UK) Limited | Professional & scientific | 2009 |
| Powertrip Electric Ltd | Construction | 2025 |
| Poynters Coaches (Northampton) Limited | Transport & logistics | 2011 |
| Poyntz Design and Build Limited | Construction | 2018 |
| PPA P25026 Limited | Construction | 2025 |
| Ppetru Ltd | Transport & logistics | 2025 |
| PPM Builders Northampton Limited | Other services | 2022 |
| PPS Maintenance Limited | Construction | 2015 |
| PPS Shopfitters Limited | Construction | 2001 |
| PR Retailing Limited | Wholesale & retail | 2015 |
| Praca Coffee Ltd | Hospitality | 2021 |
| Practical Warehouse Solutions Limited | Manufacturing | 2013 |
| Practicepie Limited | Information & communication | 2025 |
| Praevox Consultancy Ltd | Professional & scientific | 2025 |
| Pragna Properties Limited | Real estate | 2016 |
| Prakuma Logistics Solution Limited | Wholesale & retail | 2025 |