| Probitas Group Holdings Limited | Financial services | 2022 |
| Probitas Group Limited | Financial services | 2016 |
| Probitax Advisory and Accounting Limited | Professional & scientific | 2020 |
| Proconinst Limited | Professional & scientific | 2012 |
| Procovas Ltd | Construction | 2019 |
| Proctor Groundworks Limited | Construction | 2014 |
| Proctor Lighting Limited | Information & communication | 2024 |
| Proctor Removals & Storage Limited | Transport & logistics | 2013 |
| Proctor Surveyors Limited | Professional & scientific | 2014 |
| Proctor’S Property Limited | Real estate | 2022 |
| Procyon Limited | Information & communication | 1992 |
| Prodbuy Ltd | Wholesale & retail | 2010 |
| Prodec (Lincoln) Ltd | Construction | 2018 |
| Prodig Utilities Ltd | Construction | 2023 |
| Product Options Limited | Wholesale & retail | 2016 |
| Produxion Limited | Professional & scientific | 2023 |
| Profab Windows (UK) Limited | Manufacturing | 2005 |
| Professional Choice Hair & Beauty Supplies Limited | Wholesale & retail | 2004 |
| Professional Consultancy Northampton Limited | Information & communication | 2018 |
| Professional Finish Limited | Construction | 2013 |
| Professional Healthcare Services Limited | Health & social care | 2019 |
| Professional Properties Northampton Limited | Real estate | 2016 |
| Professional Recruitment Services Ltd | Administrative & support | 2024 |
| Professional Reflexology Ltd | Health & social care | 2009 |
| Professional Rehabilitation Guidance Limited | Health & social care | 1988 |
| Professional Tailors Northampton Ltd | Other services | 2023 |
| Professionals Barber's Northampton Limited | Other services | 2017 |
| Proffitt From Records Management Limited | Professional & scientific | 2010 |
| Proficient Training Ltd | Professional & scientific | 2024 |
| Profile Recruitment Limited | Administrative & support | 2017 |
| Profiles Brickwork Limited | Construction | 2014 |
| Profire Engineering Limited | Wholesale & retail | 2016 |
| Profrec Limited | Professional & scientific | 2022 |
| Prognosis Ltd | Professional & scientific | 2022 |
| Progressive Accountancy Limited | Professional & scientific | 2024 |
| Progressive Coaching Fitness Limited | Other services | 2024 |
| Progressive Contracting Limited | Real estate | 2021 |
| Progressive Physiques Ltd | Other services | 2024 |
| Progressive Safety Consulting & Solutions Ltd | Professional & scientific | 2024 |
| Progressive Safety Footwear and Clothing Limited | Wholesale & retail | 1961 |
| Progressive Training Systems Ltd | Arts & recreation | 2011 |
| Progressline Ltd | Transport & logistics | 2022 |
| Proheat Boilers Limited | Construction | 2023 |
| Proheat Northampton Ltd | Construction | 2024 |
| Project 6 Limited | Arts & recreation | 2013 |
| Project AF Limited | Administrative & support | 2009 |
| Project Build & Landscaping Ltd | Construction | 2021 |
| Project Care Limited | Health & social care | 2011 |
| Project Investment Ylmg Ltd | Construction | 2021 |
| Project Management (Southern) Limited | Households | 2013 |
| Project Pitlane Limited | Administrative & support | 2025 |
| Project Switch Limited | Information & communication | 2024 |
| Project Worx Ltd | Construction | 2014 |
| Projekt 247 Ltd | Construction | 2025 |
| Projello Solutions Limited | Professional & scientific | 2026 |
| Prokop Limited | Professional & scientific | 2025 |
| Prokopova DEV Limited | Information & communication | 2026 |
| Proletz Services Ltd | Real estate | 2026 |
| Proline Design Ltd | Other services | 2022 |
| Proline Specialist Finishing Limited | Wholesale & retail | 2005 |
| Promaxi Ltd | Health & social care | 2023 |
| Promise Academy Limited | Public administration | 2023 |
| Promoting Romanian Inspiration and Multiculturalism CIC | Wholesale & retail | 2024 |
| Promotive Fleet Care Limited | Wholesale & retail | 2025 |
| Pronea Ltd | Professional & scientific | 2012 |
| Proofconstructor Ltd | Construction | 2023 |
| Proofing Solutions Limited | Extraterritorial | 1994 |
| Propagate Investments Ltd | Real estate | 2015 |
| Propburt Ltd | Real estate | 2023 |
| Propco (P1) Ltd | Transport & logistics | 2019 |
| Propel Flight Operations Ltd | Transport & logistics | 2024 |
| Propel Marketing Ltd | Professional & scientific | 2021 |
| Proper Films Ltd | Information & communication | 2026 |
| Proper Gander Design Limited | Administrative & support | 2009 |
| Proper Logistics Limited | Transport & logistics | 2018 |
| Proper Nice Creative Ltd | Arts & recreation | 2023 |
| Properties AIA Ltd | Real estate | 2020 |
| Propertilley Ltd | Real estate | 2020 |
| Property Alternative Holdings Ltd | Health & social care | 2020 |
| Property Buyers Club Ltd | Real estate | 2022 |
| Property Keeper Ltd | Real estate | 2019 |
| Property Lizard Limited | Administrative & support | 2017 |
| Property Management & Building Company Limited | Real estate | 2018 |
| Property Pitstop Company Limited | Construction | 2014 |
| Property Retreats Investments Ltd | Hospitality | 2023 |
| Property UK Management Ltd | Real estate | 2026 |
| Property View Ltd | Real estate | 2018 |
| Property With Andrew Ltd | Administrative & support | 2016 |
| Propmax Ltd | Real estate | 2023 |
| Propolis Productions Ltd | Real estate | 2010 |
| Proptwist Estates Ltd | Real estate | 2025 |
| Proptwist Ltd | Real estate | 2023 |
| Propvestr Limited | Financial services | 2026 |
| Proresume Ltd | Wholesale & retail | 2025 |
| Prorugby Imports Limited | Manufacturing | 2017 |
| Proserve Global Limited | Administrative & support | 2025 |
| Prosico Limited | Real estate | 2024 |
| Prosourcing Central Ltd | Wholesale & retail | 2026 |
| Prospectus Financial Management Limited | Financial services | 2011 |
| Prospectus Mortgages Limited | Financial services | 2022 |