| Pro Tiler Limited | Wholesale & retail | 2010 |
| Pro Windows Property Services Limited | Construction | 2026 |
| Pro-Active PE, Sport & Physical Activity Ltd | Education | 2025 |
| Pro-Evaluate Ltd | Extraterritorial | 2014 |
| Pro-Help Limited | Public administration | 2018 |
| Pro-Help Support Limited | Public administration | 2026 |
| Pro-Use Software Consultancy Limited | Information & communication | 2018 |
| Proactive Lift Services Ltd | Professional & scientific | 2021 |
| Probably on Time Ltd | Transport & logistics | 2026 |
| Probuild Construction Services Ltd | Construction | 2024 |
| Probus Ltd | Construction | 2020 |
| Process Electrical Services Ltd | Construction | 2025 |
| Processing House Limited | Other services | 2017 |
| Processing Power Limited | Professional & scientific | 2021 |
| Prochaska Management Services Ltd | Professional & scientific | 2020 |
| Procora Ltd | Administrative & support | 2026 |
| PROCPO4U Ltd | Administrative & support | 2025 |
| Procraft Design Limited | Manufacturing | 2007 |
| Proctiva Limited | Real estate | 2021 |
| Proctor Developments Limited | Extraterritorial | 2014 |
| Proculis Limited | Information & communication | 2024 |
| Procure 2 Solutions Ltd | Professional & scientific | 2021 |
| Procut Barber Ltd | Other services | 2025 |
| Prodical Limited | Extraterritorial | 2022 |
| Product Strike Limited | Information & communication | 2023 |
| Products Engineered Ltd | Manufacturing | 2022 |
| Productsden Ltd | Wholesale & retail | 2020 |
| Proengineering Services Ltd | Construction | 2024 |
| Proeye Services Ltd | Health & social care | 2018 |
| Profashional Touch Limited | Wholesale & retail | 2007 |
| Profectus Central Limited | Real estate | 2022 |
| Professional 2U (Real Estate) Limited | Real estate | 2015 |
| Professional Deep Clean Service Ltd | Administrative & support | 2024 |
| Professional Eyebrows Bar Limited | Other services | 2015 |
| Professional Grooming Supplies Limited | Wholesale & retail | 2015 |
| Professional House Surveys Limited | Professional & scientific | 2014 |
| Professional Independent Pension Trustees Limited | Professional & scientific | 1993 |
| Professional Scaffolding Limited | Construction | 2009 |
| Professional School Portraits Limited | Professional & scientific | 2009 |
| Professional Security and Services Limited | Administrative & support | 2019 |
| Professional Services Management Ltd | Education | 2016 |
| Professional Systems Innovation Limited | Financial services | 2007 |
| Proficient Accountancy Ltd | Professional & scientific | 2011 |
| Proficient Build Limited | Construction | 2015 |
| Proficientcm Ltd | Professional & scientific | 2023 |
| Profile Appliances Limited | Wholesale & retail | 2017 |
| Profile Motors (Leicester) Limited | Wholesale & retail | 2008 |
| Profile Motors Limited | Real estate | 2000 |
| Profilmic Studios Ltd | Information & communication | 2023 |
| Prograce Ltd | Administrative & support | 2022 |
| Programme Partners Group Limited | Information & communication | 2024 |
| Progress Care and Education Limited | Education | 1996 |
| Progress Laboratory Ltd | Arts & recreation | 2026 |
| Progress Payroll Limited | Professional & scientific | 2024 |
| Progress Plant Limited | Administrative & support | 1983 |
| Progress Relocation Solutions Ltd | Hospitality | 2024 |
| Progressing Pounds Limited | Professional & scientific | 2022 |
| Progressive House Limited | Real estate | 2025 |
| Progressive Planning Ltd | Construction | 2018 |
| Progro Consulting Limited | Administrative & support | 2021 |
| Progworld Solutions Ltd | Information & communication | 2019 |
| Prohealth First AID Ltd | Health & social care | 2024 |
| Prohome Appliances Ltd | Wholesale & retail | 2024 |
| Projacs Ltd | Professional & scientific | 2020 |
| Project 103 Ltd | Real estate | 2024 |
| Project Bilal | Other services | 2014 |
| Project CG Limited | Professional & scientific | 2017 |
| Project Chakra Ltd | Education | 2016 |
| Project Floors (UK) Limited | Manufacturing | 2004 |
| Project Free - Connecting Communities C.I.C. | Education | 2024 |
| Project GUY Limited | Professional & scientific | 2017 |
| Project Hive Bidco Limited | Financial services | 2022 |
| Project Hive Midco 1 Limited | Financial services | 2022 |
| Project Hive Midco 2 Limited | Financial services | 2022 |
| Project Hive Topco Limited | Financial services | 2022 |
| Project Ignis Bidco Limited | Financial services | 2023 |
| Project Ignis Topco Limited | Financial services | 2023 |
| Project Living Limited | Real estate | 2023 |
| Project Maintenance (Leics) Ltd | Construction | 2026 |
| Project Norwich Limited | Construction | 2018 |
| Project One Digital Marketing Ltd | Administrative & support | 2022 |
| Project People Plus Limited | Information & communication | 2021 |
| Project Performance Group Limited | Arts & recreation | 2026 |
| Project Quality Ltd | Manufacturing | 2022 |
| Project Student Limited | Real estate | 2021 |
| Project Tekkerz Ltd | Manufacturing | 2026 |
| Project Unity CIC | Education | 2025 |
| Project Zxno Ltd | Construction | 2025 |
| Projectfiredoors Ltd | Construction | 2024 |
| Projects Group Ltd | Construction | 2019 |
| Projects NP Ltd | Construction | 2019 |
| Projects PL Ltd | Construction | 2019 |
| Projectsp Ltd | Wholesale & retail | 2026 |
| Projectwise Ltd | Professional & scientific | 2023 |
| Projentis Ltd | Information & communication | 2016 |
| Projex Transform Ltd | Professional & scientific | 2025 |
| Prokasa Ltd | Transport & logistics | 2018 |
| PROLASER3D Limited | Manufacturing | 2020 |
| Prolet Partners Ltd | Real estate | 2025 |
| Proline Park Homes Ltd | Construction | 2025 |