| Probate Express Limited | Professional & scientific | 2005 |
| Probity Consulting Limited Liability Partnership | | 2005 |
| Probus Apps Ltd | Information & communication | 2016 |
| Probusiness Services Limited | Professional & scientific | 2015 |
| Procare Cleaning and Maintenance Limited | Administrative & support | 2025 |
| Procare Recruitment Limited | Administrative & support | 2005 |
| Process Flow Holdings Ltd | Financial services | 2025 |
| Process Plant Installations Limited | Manufacturing | 2000 |
| Processus (UK) Limited | Professional & scientific | 2017 |
| Proclean Access Limited | Other services | 2006 |
| Proctor Projects Limited | Hospitality | 2016 |
| Procura Consulting Solutions Limited | Professional & scientific | 2016 |
| Procurement Automation & Service Ltd | Wholesale & retail | 2014 |
| Procurportfolio & Change Management Ltd | Wholesale & retail | 2012 |
| Prodbod Ltd | Information & communication | 2026 |
| Prodbyaz Beatz Ltd | Information & communication | 2025 |
| Proddow Mackay (Conveyancing) Limited | Professional & scientific | 2005 |
| Proddow Mackay Limited | Professional & scientific | 2005 |
| Proddow Mackay Solicitors LLP | | 2007 |
| Prodicus Legal Limited | Professional & scientific | 2012 |
| Prodiga (UK) Limited | Manufacturing | 2012 |
| Prodigies of Africa Ltd | Arts & recreation | 2023 |
| Product Assembly Limited | Information & communication | 2026 |
| Product Control Limited | Information & communication | 2009 |
| Product Distribution Limited | Wholesale & retail | 2019 |
| Product Partnerships Limited | Professional & scientific | 2013 |
| Product Path Limited | Professional & scientific | 2015 |
| Product Promoters Ltd | Professional & scientific | 2023 |
| Product Realm Ltd | Wholesale & retail | 2025 |
| Product Skills Limited | Professional & scientific | 2016 |
| Production Light & Sound Limited | Arts & recreation | 2005 |
| Production North (Holdings) Ltd | Financial services | 2012 |
| Production North Limited | Arts & recreation | 1999 |
| Productivv Property Solutions Ltd | Administrative & support | 2018 |
| Products 2 U Limited | Professional & scientific | 2013 |
| Prof DAR Ltd | Wholesale & retail | 2014 |
| Professional Care Academy Ltd | Education | 2025 |
| Professional Care Limited | Health & social care | 2019 |
| Professional Carehomes Ltd | Real estate | 2019 |
| Professional Carpet Cleaners Ltd | Other services | 2018 |
| Professional Choice Limited | Real estate | 2014 |
| Professional Consortium Limited | Financial services | 2025 |
| Professional Delivery Project Management Limited | Extraterritorial | 2015 |
| Professional Equipment Finance and Leasing Limited | Financial services | 2004 |
| Professional Estates Limited | Real estate | 2025 |
| Professional Exterior Cleaning Ltd | Other services | 2022 |
| Professional Funding Services Limited | Administrative & support | 2008 |
| Professional GAS & Mechanical Ltd | Construction | 2015 |
| Professional Housekeeping Services Ltd | Administrative & support | 2024 |
| Professional Joiners Ltd | Manufacturing | 2024 |
| Professional Polish Builders Leeds Ltd | Construction | 2025 |
| Professional Response Holdings Limited | Financial services | 2020 |
| Professional Response Limited | Transport & logistics | 1996 |
| Professional Services Resourcing Limited | Administrative & support | 2003 |
| Professional Sports Coaching Limited | Arts & recreation | 2017 |
| Professional Squash Association | Arts & recreation | 1992 |
| Professional Technology Ltd | Information & communication | 2025 |
| Professional Therapy Ltd | Health & social care | 2025 |
| Professional Training Consultants (Northern) Limited | | 1986 |
| Professionals at Play Ltd | Financial services | 2019 |
| Professionals International Ltd | Administrative & support | 2016 |
| Professor Alfredsson Limited | Professional & scientific | 2014 |
| Profi Cloud Ltd | Information & communication | 2023 |
| Profi Partner Ltd | Information & communication | 2023 |
| Profi Support Ltd | Information & communication | 2024 |
| Profi System Ltd | Information & communication | 2022 |
| Proficient Locums Ltd | Health & social care | 2022 |
| Proficient Mechanical Services Ltd | Construction | 2012 |
| Proficlad UK Ltd | Construction | 2012 |
| Profigips UK Ltd | Wholesale & retail | 2025 |
| Profile Care Services Ltd | Administrative & support | 2023 |
| Profile Logic Limited | Information & communication | 2005 |
| Profilm Limited | Extraterritorial | 2023 |
| Profit First Professionals UK Limited | Professional & scientific | 2021 |
| Profit Genie Group Ltd | Professional & scientific | 2013 |
| Profit MAX Accountancy Ltd | Professional & scientific | 2025 |
| Profit Pathway Limited | Professional & scientific | 2024 |
| PROFIT28 Limited | Arts & recreation | 2015 |
| Profitbooster Ltd | Administrative & support | 2023 |
| Profleet Commercial Services Limited | Wholesale & retail | 2004 |
| Progeny Asset Management Limited | Professional & scientific | 2015 |
| Progeny Holdings Limited | Administrative & support | 2019 |
| Progeny International Limited | Financial services | 2024 |
| Progeny Law and Tax Limited | Professional & scientific | 2015 |
| Progeny Trustees Limited | Professional & scientific | 2026 |
| Progeny Wealth Limited | Financial services | 1979 |
| Prognosys Electro Mechanical Services Ltd | Professional & scientific | 2023 |
| Progress Hire Ltd | Administrative & support | 2014 |
| Progress in Diamond Ltd | Wholesale & retail | 2021 |
| Progress Path Mastery Education Ltd | Education | 2026 |
| Progress Through Resilience Ltd | Wholesale & retail | 2023 |
| Progress to Change | Health & social care | 1996 |
| Progressive Medicine Limited | Health & social care | 2013 |
| Progressive Strategy Limited | Professional & scientific | 2016 |
| Proguard 365 Limited | Administrative & support | 2019 |
| Proguard Group 365 Limited | Professional & scientific | 2019 |
| Prohibition PR Ltd | Information & communication | 2012 |
| Prohire Group Limited | Administrative & support | 1997 |
| Prohire Limited | Administrative & support | 1978 |
| Proinstal Ltd | Construction | 2022 |