| Pure Zest Property Ltd | Other services | 2016 |
| Purley Knoll Developments Limited | Real estate | 2019 |
| Purley Knoll Investments Limited | Real estate | 2024 |
| Purple Eclipse Limited | Professional & scientific | 2017 |
| Purple Paper Advisory Limited | Professional & scientific | 2014 |
| Purple Planet Productions Ltd | Information & communication | 2007 |
| Putney Mining Ltd | Mining & quarrying | 2016 |
| Pvip Limited | Other services | 2025 |
| PY Marketing Ltd | Professional & scientific | 2021 |
| Pynpoint Ltd | Wholesale & retail | 2019 |
| Pyractif Limited | Administrative & support | 1977 |
| Pyrcroft House Residents Limited | Households | 1994 |
| Pyrford Financial Planning Limited | Financial services | 2022 |
| Pyrford Place Farm Limited | Professional & scientific | 2001 |
| Pyrotronix Fire & Security Ltd | Administrative & support | 2021 |
| Q a C M Limited | Households | 1988 |
| Q Nails TS Ltd | Other services | 2026 |
| QCM Investments Limited | Financial services | 2011 |
| Qcptv Limited | Professional & scientific | 2013 |
| Qdos Location Facilities Limited | Hospitality | 2024 |
| QE London Ltd | Arts & recreation | 2024 |
| QED Imperium Ltd | Arts & recreation | 2024 |
| Qflow.Ai Ltd | Professional & scientific | 2025 |
| QS & Commercial Solutions Limited | Professional & scientific | 2019 |
| Qsol 2 Capital Holdings LLP | | 2021 |
| Qsol 2 Capital Investments (MIP) LLP | | 2021 |
| Qsol 2 Capital Investments LLP | | 2021 |
| Qssr Commercial Services Limited | Professional & scientific | 2019 |
| Qualco (UK) Limited | Information & communication | 2012 |
| Qualco Holdco Limited | Financial services | 2017 |
| Qualified 4 Life Ltd | Education | 2019 |
| Quality Capital Management Limited | Financial services | 1995 |
| Quantarmed Ltd | Manufacturing | 2024 |
| Quantus Consulting Limited | Construction | 2023 |
| Quarters Ventures Limited | Information & communication | 2020 |
| Quaverline 3 Properties Limited | Administrative & support | 2008 |
| Qubeart Limited | Professional & scientific | 2014 |
| Qubicle Limited | Construction | 2007 |
| Queens Removals Ltd | Transport & logistics | 2015 |
| Queensgate Asset Management Limited | Real estate | 1992 |
| Questfp Ltd | Professional & scientific | 2013 |
| Quick Cargo Limited | Transport & logistics | 1980 |
| Quilam Capital Credit Finance Limited | Financial services | 2024 |
| Quilam Capital Credit Limited | Financial services | 2024 |
| Quilam Capital Credit Midco Limited | Financial services | 2024 |
| Quilam Capital Holdings 2 LLP | | 2019 |
| Quilam Capital Holdings Limited | Financial services | 2016 |
| Quilam Capital Investments 2 LLP | | 2019 |
| Quilam Capital Limited | Financial services | 2016 |
| Quilam JV Holdings 2 Limited | Financial services | 2021 |
| Quilam JV Holdings Limited | Financial services | 2019 |
| Quilam JV Topco Limited | Financial services | 2024 |
| Quilam Special Opportunities 2 Holdings Limited | Financial services | 2024 |
| Quilam Special Opportunities 2 Limited | Financial services | 2021 |
| Quilam Special Opportunities Limited | Financial services | 2019 |
| Quiz Management Systems Ltd | Administrative & support | 2013 |
| Quni Ltd | Construction | 2014 |
| R & S Moving Ltd | Transport & logistics | 2008 |
| R Group Industries Ltd | Wholesale & retail | 2019 |
| R Marway Limited | Health & social care | 2021 |
| R T Dining Limited | Hospitality | 2018 |
| R&S Associates Financial Planning Limited | Administrative & support | 2015 |
| R2B2 Limited | Information & communication | 2002 |
| Raceform Limited | Information & communication | 1948 |
| Racehorse Limited(The) | Professional & scientific | 1944 |
| Rachael Talibart Photography Limited | Professional & scientific | 2020 |
| Radar Contact Ltd | Transport & logistics | 2015 |
| Radiant Blinds Accessories Limited | Real estate | 1955 |
| Radish HQ Limited | Professional & scientific | 2023 |
| Ragamuffin Media Limited | Professional & scientific | 2005 |
| Rainy Sky Associates Limited | Professional & scientific | 2025 |
| RAM Enterprise Limited | Hospitality | 2020 |
| RAM Pumps Limited | Manufacturing | 1972 |
| Ramco Export and Marketing Limited | Wholesale & retail | 1976 |
| Ramco International Limited | Wholesale & retail | 1988 |
| Ramfam LLP | | 2024 |
| Ranelagh CT Property Management Company Ltd | Professional & scientific | 2024 |
| Ranmore Place RTM Company Limited | Households | 2008 |
| Rapid Urology London Ltd | Health & social care | 2026 |
| Rath Consulting Limited | Other services | 2019 |
| Rathdown Ltd | Professional & scientific | 2025 |
| RAW Search Ltd | Administrative & support | 2023 |
| Raze Projects Ltd | Construction | 2020 |
| RB & Sons Roofing Ltd | Construction | 2026 |
| RCL (UK) Ltd. | Transport & logistics | 2002 |
| RCL Cruises Ltd | Transport & logistics | 2010 |
| RCL Investments Ltd | Transport & logistics | 2005 |
| Rdas (Weybridge) Limited | Administrative & support | 2017 |
| RDD Motorsport Limited | Information & communication | 2015 |
| RDF Building & Construction Limited | Construction | 2016 |
| Re-Fraiche Ltd | Extraterritorial | 2024 |
| Reach Play Therapy Limited | Education | 2019 |
| React AI Ltd. | Information & communication | 2013 |
| Real Response Media Limited | Information & communication | 2011 |
| Realistic Digital Europe Limited | Other services | 2013 |
| Reather Engineering Limited | Manufacturing | 1978 |
| Rebel & Lola LLP | | 2016 |
| Rebel 3D Limited | Professional & scientific | 2018 |
| Recasso Ltd | Real estate | 2021 |
| Rectify Ltd | Information & communication | 2024 |