| PTE Consulting Ltd | Administrative & support | 2022 |
| PTG Sync Ltd | Information & communication | 2026 |
| PTM BIZ Solutions Ltd | Professional & scientific | 2014 |
| PTM Properties Ltd | Real estate | 2021 |
| PTR Logistique Transport Ltd | Transport & logistics | 2026 |
| Pugwash (Derby) Limited | Other services | 2010 |
| Pull Pilates Ltd | Arts & recreation | 2025 |
| Pumpkinhead Ltd | Construction | 2025 |
| Punditry Limited | Information & communication | 2012 |
| Punjabi Village Limited | Hospitality | 2026 |
| Punjabi Village Plumstead Limited | Hospitality | 2026 |
| Pure Carnival Ltd | Professional & scientific | 2025 |
| Pureblend Limited | Construction | 2006 |
| Purehealth Aesthetics Ltd | Education | 2022 |
| Purple Blocks Limited | Real estate | 2021 |
| Purple Key Ltd | Real estate | 2015 |
| Purple Peach Limited | Manufacturing | 2014 |
| PWS Services Ltd | Hospitality | 2017 |
| Pzyfer Solutions Limited | Information & communication | 2023 |
| Qalansiya Ltd | Wholesale & retail | 2024 |
| QB Construction Ltd | Construction | 2020 |
| Qbera Capital LLP | | 2017 |
| QBQ Management and More Ltd | Professional & scientific | 2025 |
| Qiao Corporation Ltd | Administrative & support | 2009 |
| Qima Advisory Limited | Professional & scientific | 2024 |
| Qima Cafe Limited | Hospitality | 2020 |
| Qima Coffee Ltd | Manufacturing | 2016 |
| Qima Food Group Limited | Manufacturing | 2025 |
| Qima Specialty Ltd | Manufacturing | 2019 |
| QJ Properties Limited | Real estate | 2017 |
| QNT Jonian UK Limited | Arts & recreation | 2025 |
| Quality Exchange Ltd | Wholesale & retail | 2024 |
| Quality Healthcare Solutions Limited | Administrative & support | 2013 |
| Quantair Visuals Limited | Professional & scientific | 2025 |
| Quantumize Ltd | Information & communication | 2017 |
| Quark Stack Ltd | Information & communication | 2019 |
| Quaysider Productions Limited | Administrative & support | 2013 |
| Quendon Group Ltd | Real estate | 2017 |
| Quickfit Services Ltd | Construction | 2026 |
| Quickhatch Consulting Limited | Information & communication | 2018 |
| Quicksol Limited | Information & communication | 2003 |
| Quiet Core Ltd | Other services | 2024 |
| Quinn Studio Limited | Professional & scientific | 2015 |
| Quintet S Holdings Limited | Real estate | 2025 |
| Qure AR Limited | Information & communication | 2025 |
| R Deal Property Ltd | Real estate | 2025 |
| R H a Blooms Ltd | Wholesale & retail | 2025 |
| R K Wellbeing Ltd | Health & social care | 2025 |
| R Stanton-Gleaves Properties Limited | Real estate | 2016 |
| R Stanton-Gleaves UK Limited | Financial services | 2015 |
| R T Goodes Properties Ltd | Real estate | 2024 |
| R W Hewitt Limited | Real estate | 2018 |
| R W Shanks Leasing Ltd | Administrative & support | 2024 |
| R&N Business Services Ltd | Administrative & support | 2024 |
| R&S Company Group Ltd | Financial services | 2025 |
| R.H. Property Developments Limited | Construction | 1986 |
| R.H.Drylining Ltd | Construction | 2015 |
| R.J. Ellice Limited | Real estate | 2003 |
| RA Carpenter Ltd | Construction | 2016 |
| RA Properties London Ltd | Real estate | 2019 |
| Raar Solutions Ltd | Real estate | 2016 |
| Rabab Ventures Ltd | Hospitality | 2023 |
| Rabayah Properties Ltd | Real estate | 2017 |
| Rabbani & TED Ltd | Professional & scientific | 2017 |
| Rachel Grewal Ltd | Administrative & support | 2023 |
| Rachelle Aesthetics Ltd | Other services | 2023 |
| Racketeer Limited | Arts & recreation | 2024 |
| Rackmaster Limited | Manufacturing | 2002 |
| Radcliffe Civils Limited | Construction | 2015 |
| Radiant Souls Ltd | Other services | 2024 |
| Radiant Waves Ltd | Education | 2025 |
| Radlett Interiors Ltd | Administrative & support | 2018 |
| Raed Construction Ltd | Construction | 2020 |
| Raffingers Holdings Limited | Professional & scientific | 2023 |
| Raffingers LLP | | 2004 |
| Raffingers Probate Limited | Professional & scientific | 2015 |
| Raffingers Trust Services Limited | Professional & scientific | 2024 |
| RAH Services Limited | Wholesale & retail | 2005 |
| Rahman Real Estate Limited | Real estate | 2024 |
| RAI Brothers Essex Limited | Construction | 2013 |
| RAI Brothers Limited | Real estate | 2011 |
| RAI Brothers Productions Limited | Information & communication | 2019 |
| RAI Tech Ltd | Information & communication | 2022 |
| Railreview Ltd | Construction | 2026 |
| Railway Hotel Apartments Limited | Real estate | 2022 |
| Rainbow Realty Limited | Real estate | 2025 |
| Rainham Environmental Holdings Limited | Financial services | 2016 |
| Raitakrai Earls Court Ltd | Hospitality | 2020 |
| Raitakrai Richmond Ltd | Hospitality | 2021 |
| Raiz Films Ltd | Information & communication | 2018 |
| Raj's Beauty Saloon Ltd | Other services | 2019 |
| Rakin U Ltd | Health & social care | 2023 |
| RAL Retail Limited | Wholesale & retail | 2021 |
| RAM Foreign Exchange Ltd | Administrative & support | 2013 |
| RAM FX Limited | Administrative & support | 2020 |
| Ramanuja Medical Company Ltd | Health & social care | 2015 |
| Rana & Rana Ltd | Other services | 2022 |
| Ranafia LLP | | 2021 |
| Rancol and Company Ltd | Construction | 2024 |
| Range Ready Ltd | Information & communication | 2026 |