| Proline Drylining Limited | Construction | 2023 |
| Prolingua Limited | Professional & scientific | 1989 |
| Promak Ltd | Administrative & support | 2025 |
| Promethean Box Limited | Information & communication | 2024 |
| Prometheus Marketing Ltd | Professional & scientific | 2023 |
| Promisync Limited | Information & communication | 2022 |
| Promote Online Ltd | Information & communication | 2009 |
| Promotion Sourcing Limited | Professional & scientific | 1998 |
| Promotion.Co.Uk Limited | Extraterritorial | 2001 |
| Prompt Miner Ltd | Information & communication | 2024 |
| Prompt Roofing Ltd | Construction | 2024 |
| Pronation Worldwide Limited | Professional & scientific | 2022 |
| Pronto Joinery Limited | Manufacturing | 1975 |
| Propack Handling Ltd | Manufacturing | 2025 |
| Propel Consultancy Ltd | Professional & scientific | 2021 |
| Proper DIY Ltd | Information & communication | 2022 |
| Properly Partners Ltd | Real estate | 2019 |
| Property 1ST (Maintenance) Limited | Other services | 2000 |
| Property Classifieds Limited | Information & communication | 2020 |
| Property Editor Ltd | Real estate | 2022 |
| Property Hodl Ltd | Real estate | 2021 |
| Property List Ltd | Administrative & support | 2022 |
| Property Management Support Services UK Limited | Administrative & support | 2011 |
| Property Medic Ltd | Extraterritorial | 2003 |
| Property Payroll Services Limited | Real estate | 2007 |
| Property Proper Ltd | Real estate | 2023 |
| Property Redefined Ltd | Financial services | 2018 |
| Property Simplified Limited | Construction | 2013 |
| Property Solutions With K & L Ltd | Real estate | 2021 |
| Property Toolkit Ltd | Information & communication | 2022 |
| PROPERTY118 Ltd | Professional & scientific | 2016 |
| Propertyeast Limited | Real estate | 2004 |
| Propillo Ltd | Financial services | 2016 |
| Propitix UK Limited | Real estate | 2019 |
| Propoultry Limited | Extraterritorial | 2011 |
| Propreports UK Ltd | Real estate | 2026 |
| Proprius Pilates Ltd | Arts & recreation | 2004 |
| Proprius Therapies Limited | Health & social care | 2015 |
| Propsol 2 Limited | Construction | 2011 |
| Propvantage Limited | Information & communication | 2025 |
| Proscape Supplies Limited | Wholesale & retail | 2024 |
| Prospect Decorating Services Ltd | Construction | 2024 |
| Prospect Handling (2006) Limited | Professional & scientific | 2006 |
| Prospect Handling Limited | Professional & scientific | 1990 |
| Prospect Place (ST Faiths Lane) Management Company Limited | Households | 2008 |
| Prospect Renewables Ltd | Construction | 2020 |
| Prosperity Hotel Ltd | Hospitality | 2023 |
| Prospero World | Other services | 2007 |
| Prosperro Limited | Administrative & support | 2007 |
| Prospher Community CIC | Administrative & support | 2019 |
| Prospher Education Ltd | Administrative & support | 2017 |
| Prospher Technology Limited | Information & communication | 2025 |
| Prospice Investments Ltd | Real estate | 2022 |
| Prospr Group Limited | Financial services | 2026 |
| Prospr Properties Limited | Real estate | 2026 |
| Prospr Solutions Limited | Financial services | 2026 |
| Proton Cars (UK) Limited | Real estate | 1984 |
| Prototech Limited | Information & communication | 1997 |
| Proudfoot Project Management Ltd | Administrative & support | 2010 |
| Prove IT '78 Investments | Financial services | 2023 |
| Provenda Services Limited | Other services | 2017 |
| Proveris Scientific UK Limited | Manufacturing | 2007 |
| Province Build Ltd | Construction | 2026 |
| Province Building Services Ltd | Real estate | 2008 |
| Provincial Building Services Ltd | Construction | 2001 |
| Provincial Services Limited | Real estate | 2001 |
| Proxfina Services Ltd | Professional & scientific | 2023 |
| PRR3 Ltd | Transport & logistics | 2025 |
| PRS Fabrication Limited | Construction | 2021 |
| PRS Surveys Limited | Professional & scientific | 2011 |
| Prss Investments Ltd | Financial services | 2022 |
| Prss Properties Limited | Real estate | 2021 |
| Prts Access Limited | Administrative & support | 2021 |
| Prudell Holdings Limited | Financial services | 2024 |
| Prudell Limited | Administrative & support | 1986 |
| Prudent Professionals Ltd | Wholesale & retail | 2024 |
| Prune & Broom Ltd | Administrative & support | 2016 |
| PS Bodyworks Ltd | Wholesale & retail | 2026 |
| PS Pumas Ltd | Extraterritorial | 2021 |
| Psalmist's Focus Care Ltd | Health & social care | 2019 |
| Psem Ltd | Other services | 2013 |
| PSG Financial Consultants Limited | Financial services | 2018 |
| PSH Environmental Ltd. | Water & waste | 1998 |
| PSK Knighton Limited | Real estate | 1995 |
| PSS Property Group Ltd | Real estate | 2025 |
| Psyche Consult Ltd | Health & social care | 2024 |
| Psychiatric Expert Ltd | Health & social care | 2020 |
| Psychiatry EG Ltd | Health & social care | 2019 |
| Psycho-Educational Consultants Limited | Professional & scientific | 2009 |
| Psychology Consulting Service Ltd | Health & social care | 2023 |
| Psyko Ltd | Professional & scientific | 2014 |
| PT Hire Limited | Administrative & support | 2010 |
| PT Hospitality Ltd | Hospitality | 2017 |
| PT Lock & Safe Ltd | Manufacturing | 2014 |
| PT Tasty Limited | Hospitality | 2022 |
| PTA Simulation Ltd | Wholesale & retail | 2025 |
| Ptashev Ltd | Wholesale & retail | 2019 |
| PTL Clothing Limited | Wholesale & retail | 2017 |
| PTS (East Anglia) Ltd | Transport & logistics | 2021 |
| PTS Fixings Ltd | Administrative & support | 2020 |