| Proactive (GB) Ltd | Wholesale & retail | 2014 |
| Proagri Ltd | Agriculture & fishing | 2009 |
| Proagri Solar Limited | Construction | 2011 |
| Proamp Limited | Manufacturing | 2019 |
| Proceed Ltd | Wholesale & retail | 2025 |
| Prodigy Homes Ltd | Real estate | 2015 |
| Production & Crime Consultants Ltd | Professional & scientific | 2025 |
| Production Picture Vehicles Ltd | Information & communication | 2026 |
| Products MD Ltd | Transport & logistics | 2019 |
| Professional African Footballers (PAF Awards) Ltd | Arts & recreation | 2023 |
| Professional Agile Development Limited | Professional & scientific | 2010 |
| Professional Agile Property Development Ltd | Real estate | 2025 |
| Professional Building Supplies Limited | Extraterritorial | 2017 |
| Professional Cleaning & Maintenance Services Ltd | Administrative & support | 2017 |
| Professional Electrical Contractors (Pro-Lec) Limited | Construction | 2015 |
| Professional Footgolf Tour Ltd | Arts & recreation | 2021 |
| Professional Social Care Ltd | Health & social care | 2021 |
| Professor Phone Ltd | Wholesale & retail | 2021 |
| Profile Aware Limited | Professional & scientific | 2008 |
| Profix 24/7 Maintenance Limited | Construction | 2026 |
| Programme and Transformation Solutions Ltd | Information & communication | 2022 |
| Programming Answer Limited | Information & communication | 2011 |
| Progress Electrical Contractors Limited | Construction | 2017 |
| Progressive Dream Homes Ltd | Real estate | 2024 |
| Project 8 Construction Ltd | Construction | 2025 |
| Project AR Limited | Information & communication | 2019 |
| Project Brexton Limited | Manufacturing | 2025 |
| Project Electric Limited | Construction | 2006 |
| Project International Company (UK) Limited | Manufacturing | 2000 |
| Project Lighting Group Limited | Manufacturing | 1995 |
| Project Lighting International Limited | Manufacturing | 2000 |
| Project Nine Maintenance Ltd | Construction | 2020 |
| Project Nine Property Group Ltd | Construction | 2018 |
| Project.Architecture Ltd | Professional & scientific | 2020 |
| Projectfiles Ltd | Professional & scientific | 2024 |
| Prokey Auto Services Ltd | Manufacturing | 2026 |
| Prolific Enterprise Group Limited | Professional & scientific | 2017 |
| Prolific Music Group Limited | Information & communication | 2025 |
| Prometasoft Limited | Information & communication | 2024 |
| Prometheus Enterprises Limited | Construction | 2012 |
| Promont Ltd | Administrative & support | 2013 |
| Prompt Side Limited | Manufacturing | 1988 |
| Promptside Holdings Limited | Administrative & support | 2017 |
| Pronet Consulting Limited | Information & communication | 2023 |
| Prontominds Ltd | Information & communication | 2024 |
| Propane GAS Essex Limited | Wholesale & retail | 2019 |
| Proper Loaders Ltd | Construction | 2023 |
| Properties by the Sea Ltd | Real estate | 2022 |
| Properties Future TND Limited | Real estate | 2017 |
| Propertize Ltd | Construction | 2011 |
| Property Associates Limited | Construction | 2011 |
| Property Book UK Limited | Real estate | 2009 |
| Property Developments Njpd Ltd | Construction | 2025 |
| Property Elevator Show (2023) Limited | Information & communication | 2023 |
| Property Investors Club Ltd | Real estate | 2017 |
| Property Master Academy Ltd | Education | 2020 |
| Property Medic London Limited | Construction | 2023 |
| Property Palette Ltd | Construction | 2025 |
| Property Photo Solutions Ltd | Professional & scientific | 2019 |
| Property Plus (Essex) Limited | Administrative & support | 2021 |
| Property Powershift Ltd | Education | 2025 |
| Property Registration Services Ltd | Administrative & support | 2026 |
| Property Risk Inspection Ltd | Professional & scientific | 2014 |
| Property Solutions Group (South East) Limited | Real estate | 2014 |
| Property Star Investments Limited | Construction | 2020 |
| Property Street Limited | Administrative & support | 1998 |
| Property Wise Assets Limited | Real estate | 2018 |
| PROPERTY360 Ltd | Construction | 2014 |
| Propet Limited | Wholesale & retail | 2008 |
| Proptech Consulting Ltd | Information & communication | 2016 |
| Proqs Ltd | Professional & scientific | 2016 |
| Prospect Place (Framlingham) Management Company Limited | Households | 2016 |
| Prospects (Colchester) Management Company Limited | Households | 2007 |
| Prospects Financial Services Limited | Professional & scientific | 2006 |
| Prosportuk Ltd | Wholesale & retail | 2016 |
| PROT8CT Ltd | Extraterritorial | 2026 |
| Proteas Care Limited | Health & social care | 2021 |
| Protech Media Limited | Administrative & support | 2021 |
| Proton Training Limited | Administrative & support | 2012 |
| Protouch Accident Repair Centre Ltd | Wholesale & retail | 2026 |
| Protouch Bodyworks Ltd | Real estate | 2020 |
| Protouch Cars Ltd | Wholesale & retail | 2026 |
| Protouch Rental Ltd | Real estate | 2022 |
| Protrainings Europe Limited | Other services | 2009 |
| Proven Pathways Ltd | Professional & scientific | 2025 |
| Provide Care Solutions Limited | Health & social care | 2001 |
| Provide Community Interest Company | Health & social care | 2010 |
| Provide Digital Limited | Information & communication | 2019 |
| Provide Enterprises Limited | Health & social care | 2006 |
| Providence (Wickford) Management Company Limited | Households | 2005 |
| Providex Group Holdings Limited | Financial services | 2025 |
| Providex Holdings Limited | Financial services | 2016 |
| Providex Homes Limited | Extraterritorial | 2019 |
| Providex Limited | Construction | 2011 |
| Providex Property Limited | Construction | 2015 |
| Provinance Ltd | Wholesale & retail | 2022 |
| Provision Systems Ltd | Administrative & support | 2024 |
| Prudence Brokers (UK) Limited | Financial services | 2016 |
| Pryce-Jenkins Psychology Ltd | Health & social care | 2021 |
| PS Bookkeeping & Accountancy Ltd | Extraterritorial | 2014 |