| Portman Square Estates Limited | Real estate | 1981 |
| Portman Square Holdings Ltd | Real estate | 1978 |
| Portman Square Securities Limited | Real estate | 1984 |
| Postremo IT Limited | Information & communication | 2015 |
| Power Demand Ltd | Construction | 2015 |
| Power Distribution & Transmission Services Ltd | Construction | 2021 |
| Powertek Renewables Limited | Energy | 2022 |
| PPS Access Hire Limited | Administrative & support | 2024 |
| PR Electrical Management Services Ltd | Manufacturing | 2016 |
| Precise Contractors Limited | Construction | 2010 |
| Precise Property Maintenance Ltd | Construction | 2014 |
| Preece Apartments Ltd | Real estate | 2023 |
| Premier 15 Limited | Real estate | 2018 |
| Premier 35 Limited | Wholesale & retail | 2020 |
| Premier 5 Limited | Wholesale & retail | 2018 |
| Premier Incorporated Limited | Wholesale & retail | 2018 |
| Premier Medical Consult Ltd | Administrative & support | 2017 |
| Premier Reclaimed Bricks Ltd | Construction | 2022 |
| Prestige Build & Maintenance Ltd | Construction | 2024 |
| Prestige Building and Landscaping Limited | Construction | 2015 |
| Prime House Renovations Ltd | Construction | 2021 |
| Priorisk Ltd | Extraterritorial | 2021 |
| Priority Property Limited | Construction | 2010 |
| Priyam Foods Limited | Wholesale & retail | 2023 |
| Prmugo Ltd | Hospitality | 2024 |
| Pro-Vent Ductwork Services Ltd | Construction | 2022 |
| Procharter Limited | Administrative & support | 2010 |
| Proclean (Surrey) Ltd | Other services | 2007 |
| Prodata Telecom Ltd | Information & communication | 2018 |
| Professional Glazing Solutions Limited | Construction | 2015 |
| Promech Engineering Services Ltd | Wholesale & retail | 2025 |
| Promoveo Coaching Limited | Administrative & support | 2023 |
| Promundial Ltd | Extraterritorial | 2014 |
| Property Algorithms Limited | Real estate | 2023 |
| Property Deals Limited | Real estate | 2024 |
| Property Developing Limited | Construction | 2016 |
| Property DUE Diligence Limited | Real estate | 2023 |
| Property Education Limited | Real estate | 2023 |
| Property Joint Ventures Limited | Construction | 2025 |
| Property Notify Limited | Information & communication | 2019 |
| Property Systems Limited | Real estate | 2023 |
| Property Training Limited | Construction | 2019 |
| Proresponse Training Ltd | Education | 2026 |
| Prshumphrey Limited | Information & communication | 2017 |
| Psalt Limited | Professional & scientific | 2017 |
| Psalt Rise CIC | Professional & scientific | 2020 |
| PSH (Commercial) Limited | Real estate | 1934 |
| PSH (Croydon) Limited | Real estate | 1988 |
| PSR Consultancy Ltd | Administrative & support | 2014 |
| Pubcast Ltd | Financial services | 2014 |
| Publishing Projects Limited | Professional & scientific | 2002 |
| Pulau Trading Company Limited | Wholesale & retail | 2016 |
| Puraest Limited | Wholesale & retail | 2021 |
| Pure Airport Transfers Limited | Administrative & support | 2025 |
| Pureline Health Ltd | Health & social care | 2020 |
| PURETECH2O (H01) Ltd | Administrative & support | 2018 |
| PURETECH2O (H02) Ltd | Administrative & support | 2018 |
| PURETECH2O (H03) Ltd | Administrative & support | 2018 |
| PURETECH2O (H04) Ltd | Administrative & support | 2019 |
| PURETECH2O (HO5) Ltd | Administrative & support | 2022 |
| PURETECH2O (HO6) Ltd | Administrative & support | 2022 |
| PURETECH2O (HO7) Ltd | Administrative & support | 2023 |
| PURETECH2O (HO8) Ltd | Administrative & support | 2026 |
| PURETECH2O (HO9) Ltd | Administrative & support | 2026 |
| PURETECH2O Franchise Limited | Administrative & support | 2018 |
| PURETECH2O Limited | Administrative & support | 2015 |
| Purley Radio Limited | Wholesale & retail | 1955 |
| Purple Haven Care Ltd | Administrative & support | 2026 |
| Q24 Aerospace (UK) Limited | Wholesale & retail | 2026 |
| Q24 Fuel (UK) Ltd | Wholesale & retail | 2026 |
| QBC Contractor Limited | Construction | 2017 |
| QS Quest Pro Limited | Administrative & support | 2018 |
| Quantfactors Limited | Administrative & support | 2026 |
| Quantum Secure Energies Limited | Professional & scientific | 2025 |
| Qubee Limited | Real estate | 2014 |
| R & M Maintenance & Developments Ltd | Construction | 2023 |
| R & R Electrical Systems Limited | Construction | 2003 |
| R J Anderson Family LLP | | 2025 |
| R. Carver Building Services Limited | Construction | 2023 |
| R. Pickles Property Ltd | Households | 2025 |
| Raakom Co Ltd | Professional & scientific | 2023 |
| RAB Creative Ltd | Arts & recreation | 2023 |
| Rabadia Productions Limited | Administrative & support | 2018 |
| Racer Limited | Extraterritorial | 2013 |
| Racoon Liverpool Limited | Real estate | 2024 |
| Raelle Music Ltd | Information & communication | 2022 |
| Raiden Electrical Contractors Limited | Construction | 2022 |
| Ranmore Energy Limited | Administrative & support | 2018 |
| Raptors Imports Ltd | Arts & recreation | 2019 |
| Rasmussen Installations LLP | | 2014 |
| Raybux Ltd | Information & communication | 2017 |
| Rayspectra Ltd | Professional & scientific | 2025 |
| Razor CUT Limited | Information & communication | 2007 |
| RBH Consultancy Ltd | Administrative & support | 2016 |
| Reaction Media Ltd | Professional & scientific | 2020 |
| Real Progress Ltd | Wholesale & retail | 2017 |
| Real Time Grading Ltd | Information & communication | 2014 |
| Real Wellness Group Ltd | Wholesale & retail | 2025 |
| Reality Sports Ltd | Information & communication | 2020 |
| Realvalue Capital Ltd | Financial services | 2014 |