| Pro-Develop Ltd | Construction | 2020 |
| Proactive Psychology Limited | Health & social care | 2022 |
| Process Facilities Design Limited | Professional & scientific | 2010 |
| Proclean Services London Limited | Other services | 2025 |
| Producible Ltd | Information & communication | 2024 |
| Prof's Mobile Tyres and Services Ltd | Wholesale & retail | 2022 |
| Professional Construction Engineers Limited | Professional & scientific | 2015 |
| Professional Maintenance Solutions Limited | Administrative & support | 2013 |
| Professional Mastic Applier Limited | Construction | 2019 |
| Professional Trak UK Ltd | Manufacturing | 2019 |
| Proficient Heart Property Limited | Real estate | 2025 |
| Profreshio Cleaning Ltd | Administrative & support | 2026 |
| Progressive Design (London) Limited | Construction | 2010 |
| Progressive Design and Developments Ltd | Construction | 2023 |
| Progressive Insight Ltd | Professional & scientific | 2010 |
| Progressively Interlaced Limited | Arts & recreation | 2018 |
| Proguard Armour Limited | Wholesale & retail | 2013 |
| Project Estimating Services Ltd | Administrative & support | 2014 |
| Project Massive Ltd | Information & communication | 2006 |
| Project Tenten C.I.C. | Health & social care | 2015 |
| Projectup Consulting Ltd | Administrative & support | 2025 |
| Prokept Limited | Wholesale & retail | 2013 |
| Prolifi Markets Ltd | Information & communication | 2025 |
| Prolifics Testing UK Limited | Information & communication | 1999 |
| Promic Flitwick Properties Ltd | Real estate | 2023 |
| Promic Properties Ltd | Real estate | 2021 |
| Promic Technology Ltd | Wholesale & retail | 2018 |
| Prop Services Ltd | Other services | 2012 |
| Propdent Ltd | Real estate | 2025 |
| Property Experts (Nationwide) Limited | Construction | 2000 |
| Property Finance Capital (NO 2) Limited | Financial services | 2014 |
| Property Finance Capital (NO 3) Limited | Financial services | 2016 |
| Property Finance Capital Limited | Financial services | 2010 |
| Property Finance Nominees (NO.3) Limited | Financial services | 1996 |
| Property Information Company Limited | Professional & scientific | 2015 |
| Property Maintenance Specialists Ltd | Construction | 2024 |
| Property Mania Limited | Construction | 2013 |
| Propr Tech Limited | Real estate | 2025 |
| Proptastic Ltd | Arts & recreation | 2016 |
| Propwayz Limited | Real estate | 2019 |
| Prorec Solution Ltd | Administrative & support | 2024 |
| Protec Botanica Ltd | Wholesale & retail | 2011 |
| Protec Ingredia Limited | Wholesale & retail | 2011 |
| Protec Nutra Limited | Wholesale & retail | 2009 |
| Protec Pharma Ltd | Extraterritorial | 2011 |
| Protect Hearts Limited | Financial services | 2019 |
| Prothero Properties Holding Limited | Real estate | 2019 |
| Prothero Properties Limited | Real estate | 2019 |
| Proudman Joinery Ltd | Construction | 2015 |
| PRP Investments Limited | Real estate | 2003 |
| PRS1 Consulting Ltd | Real estate | 2026 |
| Prudent Info Solutions Ltd | Information & communication | 2008 |
| PS 2 Holdings Ltd | Financial services | 2025 |
| PS4 Impact Ltd | Real estate | 2022 |
| PSI 2000 Limited | Information & communication | 1997 |
| PT Testing Services Limited | Information & communication | 2010 |
| PTA Consulting Ltd | Information & communication | 2016 |
| PTA LA Case Ltd | Real estate | 2019 |
| Ptba Ltd | Real estate | 2025 |
| Ptinspire Ltd | Education | 2019 |
| Pucu Ltd | Construction | 2024 |
| Pudley Limited | Real estate | 2022 |
| PUG Pro London Ltd | Arts & recreation | 2023 |
| PUG Yard Ltd | Arts & recreation | 2026 |
| Pugilist Wear London Ltd | Arts & recreation | 2023 |
| Pumpernick's Bagel Bakery Ltd | Hospitality | 2020 |
| Punti Verdi Limited | Hospitality | 2018 |
| Pure Broadcast Sound Limited | Information & communication | 2014 |
| Pure Creation Multimedia Limited | Arts & recreation | 2011 |
| Pure Massage Therapy (London) Limited | Other services | 2017 |
| Pureview Glass Ltd | Manufacturing | 2024 |
| Purltop Company Limited | Households | 2005 |
| Purple Fades Ltd | Information & communication | 2020 |
| Purson Building Services Limited | Construction | 2017 |
| Purva and Sachin Enterprise Ltd | Real estate | 2018 |
| Pushpa Software Limited | Information & communication | 2016 |
| PUT YOU on Productions Limited | Information & communication | 2014 |
| Putney Noodle Bar Ltd | Hospitality | 2025 |
| Pyramid Trading International Limited | Professional & scientific | 2009 |
| Pysces Productions Ltd | Information & communication | 2025 |
| Python Capital Limited | Other services | 2017 |
| Q-Lisci Ltd | Information & communication | 2024 |
| Qattan MS Ltd | Other services | 2024 |
| Qattan&Co Limited | Professional & scientific | 2021 |
| Qjss Construction Ltd | Construction | 2022 |
| Qpoint Windows Ltd | Construction | 2019 |
| QRAUTHENTIC8 Ltd | Information & communication | 2020 |
| Qsearch Limited | Administrative & support | 2015 |
| Qtech Consultants Ltd | Information & communication | 2019 |
| Quadbray Limited | Professional & scientific | 2024 |
| Quadrangle Mews Freehold Ltd | Households | 2016 |
| Quadrangle Mews Residents Association Limited | Households | 1989 |
| Quadtt Limited | Professional & scientific | 2012 |
| Quality by Appointment Ltd | Transport & logistics | 2025 |
| Quality Car Glass Ltd | Wholesale & retail | 2025 |
| Quality Group Holdings Limited | Real estate | 2017 |
| Quality Group Property Investments Ltd | Real estate | 2018 |
| Quality Prime Limited | Other services | 2017 |
| Quality Window Glazing Limited | Construction | 2024 |
| Quantaco Ltd | Information & communication | 2022 |