| Prodege UK, Ltd | Information & communication | 2022 |
| Production Technology Limited | Professional & scientific | 2005 |
| Productivity @ Work Limited | Administrative & support | 2013 |
| Productivity Through Software (Holdings) Limited | Professional & scientific | 2000 |
| Productivity Through Software Limited | Information & communication | 1990 |
| Productricity Consulting Ltd | Administrative & support | 2025 |
| Profectus Engineering Limited | Construction | 2015 |
| Professional Flight Solutions Ltd | Transport & logistics | 2018 |
| Professional Medical Indemnity Limited | Professional & scientific | 2024 |
| Professional Movers Ltd | Transport & logistics | 2023 |
| Professional Study Advisor Ltd | Administrative & support | 2024 |
| Proffy Tyres Ltd | Wholesale & retail | 2026 |
| Proficient Tech Consultancy Ltd | Information & communication | 2014 |
| Profit Technology Ltd | Professional & scientific | 2025 |
| Profitamount Limited | Other services | 1993 |
| Profix Ceilings & DRY Linings Limited | Wholesale & retail | 2005 |
| Proflow Ventilation Limited | Construction | 2025 |
| Profreeze Ltd | Construction | 2001 |
| Prograss BIO UK Ltd | Manufacturing | 2019 |
| Progreen (Properties) Limited | Real estate | 2013 |
| Progressfish Limited | Information & communication | 2017 |
| Progressive IT Consultancy Services Limited | Administrative & support | 2024 |
| Proicere Digital Ltd. | Information & communication | 2018 |
| Proicere Group Limited | Financial services | 2025 |
| Project Analysis UK Limited | Administrative & support | 2014 |
| Project Bluebell (Bidco) Limited | Financial services | 2022 |
| Project Bluebell (Holdco) Limited | Financial services | 2022 |
| Project Bluebell (Midco) Limited | Financial services | 2022 |
| Project Bluebell (Topco) Limited | Financial services | 2022 |
| Project Caribou Bidco Limited | Financial services | 2023 |
| Project Cost Services Ltd | Professional & scientific | 2023 |
| Project Delivery Success (PDS) Limited | Administrative & support | 2013 |
| Project Development Workshop Limited | Administrative & support | 1989 |
| Project Doncaster Limited | Professional & scientific | 2014 |
| Project Driven Delivery Limited | Information & communication | 2013 |
| Project Eiger 3 Limited | Extraterritorial | 2022 |
| Project Engineering Services Ltd | Administrative & support | 2026 |
| Project Enhance Holdco Limited | Financial services | 2026 |
| Project MAS Ltd | Administrative & support | 2022 |
| Project Mccoy Limited | Real estate | 2025 |
| Project Mersey Bidco Limited | Financial services | 2022 |
| Project Mersey Midco Limited | Financial services | 2022 |
| Project Mersey Topco Limited | Financial services | 2022 |
| Project Planning & Support Services Limited | Information & communication | 2007 |
| Project Resource Utilities Ltd | Administrative & support | 2017 |
| Project SHE C.I.C. | Education | 2020 |
| Project Squared Limited | Administrative & support | 2017 |
| Project Zilla Ltd | Information & communication | 2019 |
| Project-Ron Limited | Administrative & support | 2017 |
| Projectchoice Limited | Real estate | 1996 |
| Projectit Group Ltd | Professional & scientific | 2022 |
| PROJECTMANAGEMENT-4U Limited | Professional & scientific | 2007 |
| Projectpedia Ltd | Administrative & support | 2021 |
| Projectprince Ltd | Information & communication | 2009 |
| Projecture Ltd | Administrative & support | 2022 |
| Projen Limited | Administrative & support | 1995 |
| Projineering Services Limited | Administrative & support | 2015 |
| Proline Consultancy Services Ltd | Information & communication | 2019 |
| Prometus Limited | Administrative & support | 2007 |
| Promotor Supplies Ltd | Wholesale & retail | 2012 |
| Prompt Telecom Ltd | Information & communication | 2019 |
| Proms Consulting Ltd | Administrative & support | 2023 |
| Propel Accounting - for Freelancers & Small Businesses Ltd | Professional & scientific | 2026 |
| Propel Living Ltd | Health & social care | 2023 |
| Propeller Homes Ltd | Construction | 2019 |
| Proper Tea Lettings Limited | Real estate | 2022 |
| PROPERTEA4U Limited | Real estate | 2019 |
| Properties Management by Percy Ltd | Households | 2023 |
| Propertingle Holdings Ltd | Real estate | 2025 |
| Property Bear Group Ltd | Real estate | 2023 |
| Property by Purple Gecko Limited | Real estate | 2022 |
| Property Developments North West Ltd | Real estate | 2025 |
| Property Doctor (Maintenance) Limited | Construction | 2013 |
| Property Hawk Limited | Real estate | 2022 |
| Property Shop (Accrington) Limited | Real estate | 2003 |
| Property Shop (NW) Limited | Real estate | 2008 |
| Property Sounds Important Limited | Real estate | 2018 |
| Property Surv Ltd | Professional & scientific | 2023 |
| Property Trail Ltd | Real estate | 2018 |
| Property Wanted Ltd | Real estate | 2016 |
| Propmove Ltd | Real estate | 2019 |
| Propoly Online Limited | Information & communication | 2014 |
| Propriedade Dyson Ltd | Real estate | 2011 |
| Prosab Limited | Administrative & support | 2013 |
| Proseed Properties Limited | Real estate | 2019 |
| Proseed Stunts Limited | Arts & recreation | 2004 |
| Proserv Consulting Limited | Information & communication | 2015 |
| Prosource UK Ltd. | Administrative & support | 2015 |
| Prospect Financial Management Limited | Other services | 2018 |
| Prospect PLM Limited | Administrative & support | 2015 |
| Prosperity Accounting Limited | Professional & scientific | 2025 |
| Prosperity Enterprise Ltd | Real estate | 2019 |
| Prosperity Forge Limited | Professional & scientific | 2024 |
| Prosperity Network Ltd | Education | 2020 |
| Prostay Properties Ltd | Hospitality | 2024 |
| Protan (UK) Ltd | Manufacturing | 1996 |
| Protec Surfaces Limited | Administrative & support | 2019 |
| Protech Project Solutions Ltd | Information & communication | 2026 |
| Protech Property Services Ltd | Construction | 2007 |
| Protecting People Properly Ltd | Financial services | 2025 |