| Queue Solutions Ltd | Administrative & support | 2015 |
| Quick Feast Ltd | Hospitality | 2016 |
| Quick Trip Ltd | Real estate | 2019 |
| Quincetree Consulting Limited | Professional & scientific | 2019 |
| Quinnmore Construction Limited | Construction | 2026 |
| Quintuple L Productions Ltd | Arts & recreation | 2021 |
| Quirky Interiors Limited | Construction | 2011 |
| Ququ Otter Ltd | Wholesale & retail | 2026 |
| R & S Global Events Limited | Professional & scientific | 2021 |
| R & S Promotion Limited | Arts & recreation | 2019 |
| R a & a Dumbarton Ltd | Construction | 2017 |
| R a Evans Plumbing & Heating Limited | Construction | 2015 |
| R D Aldridge Ltd | Health & social care | 2012 |
| R Hobbs Properties Ltd | Construction | 2025 |
| R M Banathy Consulting Limited | Information & communication | 2009 |
| R Newman Construction Ltd | Construction | 2024 |
| R Newman Properties Ltd | Real estate | 2023 |
| R Sangha Medical Ltd | Health & social care | 2021 |
| R Stevens Media & Entertainment Ltd | Professional & scientific | 2026 |
| R West Events Ltd | Professional & scientific | 2025 |
| R&E Media Ltd | Information & communication | 2023 |
| R&T Property Group Ltd | Real estate | 2025 |
| R-Bag UK Ltd | Transport & logistics | 2023 |
| R. Hamilton Operations Limited | Information & communication | 2025 |
| R. Martin Developments Limited | Construction | 1975 |
| R.D.A.Investments Limited | Real estate | 1955 |
| R.I.M. A.C.D. Limited | Transport & logistics | 2011 |
| R.J. & C.J. Investments Ltd | Real estate | 2007 |
| R.J. Nash Consultancy Limited | Administrative & support | 2003 |
| R.P.M. Building Contractors Limited | Construction | 1994 |
| R.S. Rigging Limited | Information & communication | 2007 |
| R.Tomar Consultancy Limited | Health & social care | 2015 |
| R3 Clinical Advisory Limited | Health & social care | 2026 |
| R3 Invest Ltd | Real estate | 2019 |
| Raar! Ltd | Information & communication | 2012 |
| Rabbit Hole Bars Ltd | Hospitality | 2019 |
| Rachel Jeffrey Jewellery School Limited | Education | 2011 |
| Rachel Jeffrey Limited | Wholesale & retail | 2009 |
| Rachel KS Consulting Limited | Professional & scientific | 2022 |
| Racing Gold Limited | Manufacturing | 2009 |
| Radgreen Ltd | Information & communication | 2018 |
| Radiant Collective Travel Ltd | Administrative & support | 2026 |
| Radiate London Ltd | Arts & recreation | 2026 |
| Radicle Consulting Ltd | Professional & scientific | 2010 |
| Radio Place (ST Albans) Limited | Households | 2021 |
| Radlett Cars UK Ltd | Wholesale & retail | 2025 |
| Radlett Motor Centre Ltd | Wholesale & retail | 2009 |
| Radlett Vehicle Valet Services Limited | Other services | 2024 |
| RAE Law Ltd | Professional & scientific | 2026 |
| Raed II SPV Four LP | | 2022 |
| Raed II SPV Three LP | | 2022 |
| Raenock Ltd | Professional & scientific | 2025 |
| Raffo & Co Ltd | Professional & scientific | 2017 |
| Raine Solutions (2014) Limited | Professional & scientific | 2024 |
| Rajbari UK Ltd | Hospitality | 2024 |
| Rall Property Limited | Households | 2023 |
| Raloe UK Ltd | Wholesale & retail | 2021 |
| Ralph Allen Press Limited | Manufacturing | 2002 |
| Ralph Hosier Engineering Limited | Manufacturing | 1997 |
| Ralph Meet Limited | Information & communication | 2026 |
| Ralph Riley Limited | Other services | 2000 |
| RAM & Sons Ltd | Construction | 2014 |
| Ramashka UK Ltd | Extraterritorial | 2011 |
| Rambo Accessories Ltd | Wholesale & retail | 2025 |
| Ramrod Systems Consultancy Ltd | Information & communication | 2016 |
| Ramryge Court Management Company Limited | Real estate | 1981 |
| Ramya Infotech Limited | Information & communication | 2015 |
| Ranbury Property Services Limited | Real estate | 2014 |
| Random Task Plumbing Ltd | Construction | 2016 |
| Ranelagh Limited | Other services | 2016 |
| Rangers Scenery Limited | Construction | 2021 |
| Rank Unlimited Media Ltd | Information & communication | 2019 |
| Rank Ventures SPV I LLP | | 2022 |
| Rank Ventures SPV IV LLP | | 2024 |
| Rann Properties Limited | Real estate | 2022 |
| Rapid Care Transcription UK Ltd | Information & communication | 2024 |
| Rapture Media Ltd | Information & communication | 2024 |
| Rarlo Ltd | Hospitality | 2023 |
| Rashid Property Limited | Real estate | 2025 |
| Ratapro Ltd | Wholesale & retail | 2024 |
| Ratio Consultants Limited | Professional & scientific | 2025 |
| Rave Lounge Ltd | Hospitality | 2025 |
| Raven Recruitment Limited | Administrative & support | 2013 |
| Raven TOR Limited | Administrative & support | 2019 |
| Ravensbank Securities Limited | Extraterritorial | 1992 |
| Ravenwood Hall Hotel Limited | Hospitality | 1985 |
| RAW Craft Forge Ltd | Manufacturing | 2025 |
| RAW Property Holdings Limited | Financial services | 2023 |
| RAW Tapin Ltd | Other services | 2018 |
| RAY of Light Productions Limited | Information & communication | 2014 |
| Raya Group Ltd | Professional & scientific | 2026 |
| Raydens Limited | Professional & scientific | 2011 |
| Raye Wealth Ltd | Information & communication | 2025 |
| Rayners Tripple R Services Ltd Ltd | Wholesale & retail | 2023 |
| Rayv Limited | Professional & scientific | 2019 |
| Razor Merqueo I LLP | | 2021 |
| RB 2015 Holdings Limited | Real estate | 2015 |
| RB Lighting Ltd | Construction | 2022 |
| RBC Mechanical Limited | Construction | 2011 |
| RBC Property Developments Limited | Construction | 2000 |