| Production Software Technology Limited | Information & communication | 1990 |
| Productive Energy Ltd | Administrative & support | 2019 |
| Productivity and Process Management Services Limited | Manufacturing | 2015 |
| Profalgo Holding Limited | Financial services | 2019 |
| Profast Roofing Systems Ltd | Manufacturing | 2010 |
| Professional Automotive Logistics Limited | Transport & logistics | 2025 |
| Professional Driver Resources UK Limited | Education | 2011 |
| Professional Qualifications Board of UK Ltd | Education | 2025 |
| Professional Rail Services Ltd | Construction | 2022 |
| Professional Soils Laboratory Limited | Professional & scientific | 2004 |
| Profit Flooring Ltd | Wholesale & retail | 2024 |
| Profit Improvement Partnership Limited | Professional & scientific | 2009 |
| Profix Auto Repairs Ltd | Wholesale & retail | 2024 |
| Progrand Holding Limited | Financial services | 2024 |
| Progressive Voice Services Limited | Information & communication | 2009 |
| Project 3 Architecture Ltd | Professional & scientific | 2012 |
| Project Berkeley Limited | Professional & scientific | 2026 |
| Project Business Ltd | Professional & scientific | 2020 |
| Project Catalyst Bidco Limited | Education | 2025 |
| Project Catalyst Midco Limited | Education | 2025 |
| Project Catalyst Topco Limited | Education | 2025 |
| Project Chicago Bidco Limited | Financial services | 2023 |
| Project Chicago Midco 1 Limited | Financial services | 2023 |
| Project Chicago Midco 2 Limited | Financial services | 2023 |
| Project Chicago Nominees Limited | Financial services | 2024 |
| Project Chicago Topco Limited | Financial services | 2023 |
| Project Display Ltd | Wholesale & retail | 2020 |
| Project Global Solutions Ltd | Professional & scientific | 2010 |
| Project Heating Solutions Limited | Construction | 2018 |
| Project Impetus Bidco Limited | Financial services | 2022 |
| Project Impetus Topco Limited | Financial services | 2022 |
| Project Key Management Limited | Real estate | 2006 |
| Project Mayfair Ltd | Information & communication | 2021 |
| Project Resource (Holding) Ltd | Administrative & support | 2018 |
| Projekt 47 Limited | Administrative & support | 2016 |
| Projem PUB Company Limited | Hospitality | 2016 |
| Projex (North) Ltd | Construction | 2025 |
| Projexia Limited | Information & communication | 2020 |
| Promeica Ltd | Extraterritorial | 2014 |
| Promindset Communities CIC | Education | 2026 |
| Promindset Limited | Other services | 2014 |
| Promo Workshop Limited | Professional & scientific | 2021 |
| Promotion Pros Ltd | Professional & scientific | 2024 |
| Promtec Ltd | Manufacturing | 2017 |
| Prontobuild Ltd | Construction | 2016 |
| Propel Bodyworks Ltd | Wholesale & retail | 2025 |
| Proper Management Ltd | Other services | 2011 |
| Properties by HK Limited | Real estate | 2025 |
| Properties for People Limited | Real estate | 2025 |
| Properties Platform Ltd | Information & communication | 2026 |
| Properties Yorkshire Ltd | Real estate | 2023 |
| Property Acquisitions and Management Limited | Real estate | 1995 |
| Property ARC Limited | Construction | 2015 |
| Property Asset Partners Ltd | Real estate | 2025 |
| Property by NK Ltd | Real estate | 2026 |
| Property Company A.S. Limited | Real estate | 2021 |
| Property EC Limited | Real estate | 2024 |
| Property Maintenance Support Limited | Households | 2022 |
| Property Paving Ltd | Construction | 2025 |
| Property Sales and Funding Limited | Administrative & support | 2016 |
| Property Sourcing Plus Ltd | Real estate | 2020 |
| PROPERTY4LIFE Ltd | Real estate | 2016 |
| Propertymaintained Ltd | Households | 2014 |
| Propipe Mechanical Ltd | Construction | 2019 |
| Prorun Limited | Real estate | 1996 |
| Prosec Facilities Limited | Administrative & support | 2016 |
| Prosec Wholesale Limited | Administrative & support | 2022 |
| Prosecure Group Limited | Financial services | 2020 |
| Prosecure Properties Limited | Real estate | 2024 |
| Prospect Dariusz Dachtera Limited | Construction | 2009 |
| Prospect House Farm Ltd | Wholesale & retail | 2007 |
| Prospect Mill (Management) Company Limited | Extraterritorial | 2001 |
| Prospecta Properties Ltd | Real estate | 2023 |
| Prosper Property Holdings Limited | Real estate | 2025 |
| Protech Rail Ltd | Professional & scientific | 2025 |
| Protect Your Services Ltd | Information & communication | 2024 |
| Protect Your Space Limited | Wholesale & retail | 2024 |
| Protected Electrics Ltd | Construction | 2016 |
| Proturf Limited | Agriculture & fishing | 2001 |
| Provencelia UK Ltd | Extraterritorial | 2025 |
| Proweld Welding Supplies Limited | Wholesale & retail | 2000 |
| Prplumbing N Heating Ltd | Construction | 2022 |
| Prsr Auto Ltd | Wholesale & retail | 2023 |
| PRU Energy Ltd | Manufacturing | 2023 |
| Prudent Construction Services Ltd | Real estate | 2024 |
| Prue-N Ltd | Health & social care | 2022 |
| Prydek Ltd | Wholesale & retail | 2024 |
| Prym Health Ltd | Financial services | 2020 |
| Pryor Signs Limited | Manufacturing | 2005 |
| Przemyslaw Grabowski Ltd | Administrative & support | 2016 |
| PS Everything Limited | Hospitality | 2025 |
| PS Holdings (Yorkshire) Ltd | Financial services | 2022 |
| PSC Limited | Real estate | 1998 |
| PSC Trans Ltd | Transport & logistics | 2015 |
| PSC Vision Group Ltd | Professional & scientific | 2019 |
| Psgs Services Ltd | Wholesale & retail | 2021 |
| Psit Private Limited | Wholesale & retail | 2026 |
| PSS Fabrication Ltd | Manufacturing | 2021 |
| PSS Supplies Ltd | Wholesale & retail | 2025 |
| PSX Express Ltd | Transport & logistics | 2023 |