| Pior Limited | Arts & recreation | 2016 |
| PIP Studios Limited | Information & communication | 2019 |
| Pipegen Inc Ltd | Professional & scientific | 2023 |
| Pitch Perfect Heating Ltd | Wholesale & retail | 2025 |
| Pixeled Eggs Limited | Information & communication | 2011 |
| Pizzeria Antó Ltd | Hospitality | 2025 |
| PJ Restaurants Limited | Hospitality | 2014 |
| PJD Drafting Services Ltd | Professional & scientific | 2014 |
| PJM Autos Ltd | Wholesale & retail | 2025 |
| PK Real Estate Limited | Real estate | 2012 |
| Plan B International Ltd | Administrative & support | 2022 |
| Plant the Seed Education Ltd | Water & waste | 2025 |
| Platinum Crowne Ltd | Households | 2021 |
| Play and Create Limited | Hospitality | 2015 |
| Pleiades Investments Limited | Real estate | 2017 |
| Ploy Star Thai Massage Ltd | Other services | 2022 |
| PLR Bargains Ltd | Extraterritorial | 2022 |
| Plum Sterling Limited | Health & social care | 2020 |
| Plus Telecom Group Limited | Professional & scientific | 2022 |
| Plus Telecom Limited | Information & communication | 2000 |
| PM Consultancy Services Ltd | Information & communication | 2015 |
| PM Pro Ltd | Administrative & support | 2010 |
| PM Real Estate Limited | Real estate | 2025 |
| Pmann Ltd | Real estate | 2021 |
| Pnpcd Ltd | Hospitality | 2024 |
| POB UK Limited | Administrative & support | 2022 |
| Podloc Limited | Manufacturing | 2015 |
| Point Five Pictures Ltd | Other services | 2013 |
| Polity Research Limited | Information & communication | 2002 |
| Pollstrong Limited | Administrative & support | 1989 |
| Polo Animal Ltd | Agriculture & fishing | 2026 |
| Polr Consultancy Limited | Professional & scientific | 2025 |
| Ponchlin Limited | Manufacturing | 2018 |
| Poosheshgar Ltd | Wholesale & retail | 2019 |
| Popakul Development Ltd | Construction | 2017 |
| Popatlal Park Ltd | Financial services | 2019 |
| Poperty Limited | Construction | 2013 |
| Popeyes UK Barber Ltd | Other services | 2025 |
| Portfolio by Sycamore&Co Ltd | Real estate | 2025 |
| Porthaven Care Homes (BM) Limited | Health & social care | 2024 |
| Porthaven Care Homes (CW) Limited | Health & social care | 2024 |
| Porthaven Care Homes (EG) Limited | Health & social care | 2024 |
| Porthaven Care Homes (LG) Limited | Health & social care | 2024 |
| Porthaven Care Homes Limited | Health & social care | 2011 |
| Porthaven Care Homes LLP | | 2009 |
| Porthaven Care Homes NO 2 Limited | Health & social care | 2012 |
| Porthaven Care Homes NO 3 Limited | Health & social care | 2016 |
| Porthaven Finance Limited | Professional & scientific | 2011 |
| Porthaven Group Holdings Limited | Professional & scientific | 2011 |
| Porthaven Group Ventures Limited | Financial services | 2017 |
| Porthaven Holdings (Hbuk) Limited | Financial services | 2025 |
| Porthaven Holdings (NW) Limited | Financial services | 2023 |
| Porthaven Management Limited | Professional & scientific | 2011 |
| Porthaven Properties (BM) Limited | Real estate | 2024 |
| Porthaven Properties (CW) Limited | Real estate | 2024 |
| Porthaven Properties (EG) Limited | Health & social care | 2023 |
| Porthaven Properties (LG) Limited | Real estate | 2024 |
| Porthaven Properties (Sidmouth) Limited | Real estate | 2025 |
| Porthaven Properties Limited | Construction | 2011 |
| Porthaven Properties NO 2 Limited | Health & social care | 2012 |
| Porthaven Properties NO 3 Limited | Health & social care | 2016 |
| Porthaven Property Limited | Real estate | 2012 |
| Porthaven Topco (NW) Limited | Financial services | 2025 |
| Portland Flats RES. Assoc. (Marlow) Ltd | Households | 1997 |
| Portland Mews RES. Assoc. (Marlow) Ltd | Households | 1997 |
| Portobello Place Limited | Construction | 2016 |
| Potter Associates Limited | Real estate | 2021 |
| Potters Place (Haywards Heath) Management Company Limited | Households | 2021 |
| Powerhouse Cleaning Services Limited | Administrative & support | 2018 |
| Powerline (UK) Limited | Wholesale & retail | 1997 |
| Powertech Trading Limited | Wholesale & retail | 2019 |
| Powertechuk Limited | Wholesale & retail | 2016 |
| PPP Global Ltd | Construction | 2019 |
| Pqmt Ltd | Administrative & support | 2022 |
| Praetomen Limited | Construction | 2004 |
| Predictive Systems Limited | Professional & scientific | 2008 |
| Prelibato Ltd | Wholesale & retail | 2020 |
| Prembar International Limited | Administrative & support | 2018 |
| Premium Plumbers Ltd | Construction | 2020 |
| Premium Steel Limited | Other services | 2020 |
| Prep 24 Ltd | Wholesale & retail | 2020 |
| Pretty Handy Ltd | Wholesale & retail | 2024 |
| Prideful Ltd | Hospitality | 2019 |
| Primavera (Maidenhead) Freehold Company Limited | Households | 2014 |
| Primavera (Maidenhead) Residents Management Company Limited | Households | 2010 |
| Prime Alloy Repairs Ltd | Wholesale & retail | 2025 |
| Prime Travels Ltd | Extraterritorial | 2021 |
| Primeduk Limited | Education | 2025 |
| Primelite Estates Ltd | Real estate | 2026 |
| Primesync Ltd | Wholesale & retail | 2025 |
| Primrose & Harvey Construction Limited | Construction | 2025 |
| Primrose Chauffeurs Ltd | Transport & logistics | 2025 |
| Primus Associates Limited | Professional & scientific | 2003 |
| Prince Andrew Close Property Management Company Limited | Households | 1970 |
| Private Specialist GPS Ltd | Health & social care | 2017 |
| Prize Technology Ltd | Information & communication | 2023 |
| Pro Landscapes MDX Ltd | Administrative & support | 2014 |
| Pro Machinery Ltd | Wholesale & retail | 2022 |
| Proact Partnership Cyprus Limited | Professional & scientific | 2009 |
| Probe TV Ltd | Information & communication | 2004 |