| Professional Legacy Planning Ltd | Other services | 2019 |
| Professional Photographers Association | Other services | 2022 |
| Professional Picture Hanging UK Ltd | Construction | 2024 |
| Professional Recruitment Limited | Administrative & support | 2009 |
| Professional Sport & Fitness Ltd. | Wholesale & retail | 2003 |
| Professional Unification of Martial Arts Limited | Education | 2000 |
| Professional Writing Academy Limited | Education | 2011 |
| Professionaldeepclean Ltd | Administrative & support | 2026 |
| Proff Global Ltd | Wholesale & retail | 2021 |
| Proficient-Ly Consulting Ltd | Administrative & support | 2025 |
| Profile Construction Ltd | Construction | 2016 |
| Profile Vision Limited | Information & communication | 2001 |
| Profilehit Limited | | 1987 |
| Profish Ltd. | Manufacturing | 2014 |
| Profit Systems UK Limited | Information & communication | 2008 |
| Profitline LP | | 2015 |
| Profitunity Ltd | Professional & scientific | 2018 |
| Profix DRY Lining Limited | Construction | 2024 |
| Profleet Chauffeurs Ltd | Transport & logistics | 2025 |
| Proflex Hose Limited | Manufacturing | 2005 |
| Proflo Bathrooms and Boilers Ltd | Construction | 2024 |
| Proformance Coaching Ltd | Education | 2023 |
| Profusion Cosmetics UK Ltd | Wholesale & retail | 2016 |
| Profusion Health Limited | Professional & scientific | 2022 |
| Progain Herb Limited | Wholesale & retail | 2025 |
| Progold Limited | Construction | 2011 |
| Programme Design Ltd | Administrative & support | 2008 |
| Programmepros Limited | Information & communication | 2018 |
| Progressive Access to Clean Energy Ltd | Extraterritorial | 2025 |
| Progressive Entities Limited | Administrative & support | 2022 |
| Progressive Establishments Limited | Transport & logistics | 2024 |
| Progressive Heat Solutions Ltd | Construction | 2021 |
| Progressive Innovations Ltd | Transport & logistics | 2025 |
| Progressive Kids Bristol Limited | Health & social care | 2023 |
| Progressive Logic Limited | Information & communication | 1999 |
| Progressive Mailing Ltd | Transport & logistics | 2025 |
| Progressive Minds Ltd | Health & social care | 2022 |
| Progressive People Solutions Limited | Professional & scientific | 2017 |
| Progressive Property Development Ltd | Construction | 2025 |
| Progressive Therapies Limited | Health & social care | 2022 |
| Progressive Trading Ltd | Transport & logistics | 2025 |
| Progressive Wonders Ltd | Transport & logistics | 2024 |
| Progris Limited | Manufacturing | 2014 |
| Proheat Plumbing and Heating SW Ltd | Construction | 2023 |
| Proj-X Communications Limited | Information & communication | 1995 |
| Project 44 Development Limited | Construction | 2022 |
| Project 44 Property Limited | Real estate | 2022 |
| Project Aware Foundation | Education | 1999 |
| Project Daniel Buyer Limited | Financial services | 2024 |
| Project Daniel Topco Limited | Financial services | 2024 |
| Project Dragonfly CIC | Education | 2020 |
| Project Eagle Holdings Limited | Wholesale & retail | 2024 |
| Project Fusion Bidco Limited | Financial services | 2021 |
| Project Gamebox Ltd | Arts & recreation | 2023 |
| Project Geek Ltd | Information & communication | 2019 |
| Project Hartland Ltd | Real estate | 2011 |
| Project Heritage Group Ltd | Construction | 2026 |
| Project Installation Building Ltd | Construction | 2014 |
| Project Intervention Ltd | Professional & scientific | 2023 |
| Project Link Limited | Construction | 2005 |
| Project Offset Limited | Administrative & support | 2019 |
| Project One Solutions Ltd | Professional & scientific | 2012 |
| Project People Limited | Information & communication | 1995 |
| Project Performance Coaching Ltd | Other services | 2023 |
| Project Property Solutions Ltd | Construction | 2022 |
| Project Relish UK Ltd | Wholesale & retail | 2014 |
| Project Resolution Services Ltd | Construction | 2024 |
| Project Shlyah Ltd | Administrative & support | 2025 |
| Project Smith Ltd | Professional & scientific | 2007 |
| Project Start Group Ltd | Administrative & support | 2022 |
| Project Start Recruitment Solutions Limited | Professional & scientific | 2016 |
| Project Unlock Newco Limited | Professional & scientific | 2025 |
| PROJECT32 Group Ltd | Information & communication | 2020 |
| Projecta Solutions Limited | Construction | 2025 |
| Projectpros Hub Ltd | Information & communication | 2024 |
| Projex Design (UK) Limited | Wholesale & retail | 2009 |
| Projex Developments LLP | | 2005 |
| Proline Building Services Limited | Construction | 2004 |
| Proline Electrical Services Ltd | Construction | 2026 |
| Proline Taxi Limited | Transport & logistics | 2018 |
| Prologue Computers Ltd | Information & communication | 1990 |
| Proluxe Cleaning Services Ltd | Administrative & support | 2024 |
| Promaxx Cleaning Services Limited | Administrative & support | 2025 |
| Promed Holding Ltd | Financial services | 2019 |
| Promenade House Management Company Limited | Households | 2021 |
| Promessa Limited | Transport & logistics | 2024 |
| Prometheus A.E. Ltd | Manufacturing | 2011 |
| Prometheus Group Limited | Administrative & support | 2021 |
| Prometric Limited | Administrative & support | 1998 |
| Promintal Consulting Limited | Professional & scientific | 2025 |
| Promise Land Care Ltd | Other services | 2018 |
| Promodeling Limited | Information & communication | 2017 |
| Promote Mifumi Project Ltd | Financial services | 1994 |
| Promoting Independent Care Ltd | Health & social care | 2019 |
| Prompt Business AI Ltd | Information & communication | 2020 |
| Prompt Global Limited | Education | 2023 |
| Prompt Transport International Limited | Extraterritorial | 2014 |
| Prompt Transport Limited | Transport & logistics | 1994 |
| Prompter Ltd | Arts & recreation | 2023 |
| Promptly FIX Maintenance Limited | Administrative & support | 2025 |