| Retail Space Management Limited | Real estate | 2000 |
| Retire Today Limited | Professional & scientific | 2026 |
| Retrowave Gaming Ltd | Wholesale & retail | 2025 |
| Revive LA Vida Limited | Health & social care | 2025 |
| Revive Young CIC | Education | 2026 |
| Revivr Supplements Limited | Wholesale & retail | 2026 |
| Rexcell Limited | Construction | 2004 |
| Rgem Ltd | Energy | 2023 |
| RGM Property Investment Limited | Real estate | 2014 |
| RGO Construction Ltd | Construction | 2025 |
| Rgvc (UK) Sub-Ocean LLP | | 2024 |
| RH Innovation Limited | Professional & scientific | 2024 |
| Rhoem Limited | Real estate | 2026 |
| Rhpd (London) Limited | Real estate | 2024 |
| Rhys Recruitment Limited | Administrative & support | 2023 |
| RIC Medical Ltd | Health & social care | 2014 |
| Richroch Investments Ltd | Real estate | 2008 |
| Rickie's Kitchen Club Ltd | Manufacturing | 2026 |
| Right Choice Mobility Limited | Health & social care | 2012 |
| Righteous Fugitive Ltd | Information & communication | 2022 |
| Riks Developments Limited | Real estate | 2002 |
| Ringo Ilford Limited | Construction | 2016 |
| Rising Star (Kensington) Ltd | Hospitality | 2012 |
| Rising Sun & Co UK Limited | Construction | 2001 |
| River Court Freehold Ltd | Real estate | 2015 |
| River Junction (Holdings) Limited | Financial services | 2024 |
| River Junction Limited | Construction | 2021 |
| River LEA Developments Ltd | Construction | 2019 |
| Rivermews-Broxbourne Limited | Construction | 2025 |
| Riverside Commodities Ltd | Agriculture & fishing | 2008 |
| Riverstone Healthcare Partners Ltd | Health & social care | 2025 |
| Riviera Growhouse Ltd | Other services | 2017 |
| Rizwan Omer Limited | Professional & scientific | 2015 |
| RJ Haus Ltd | Real estate | 2023 |
| RJB Consulting & Development Limited | Professional & scientific | 2002 |
| RJM Contracts Limited | Construction | 2009 |
| RJM Mech Limited | Professional & scientific | 2024 |
| RJM Projects & Design Limited | Construction | 2019 |
| RK Auto Rental Limited | Administrative & support | 2026 |
| RK Healthcare Partners Ltd | Professional & scientific | 2026 |
| RK Klinika Ltd | Health & social care | 2015 |
| RLA Services Ltd | Wholesale & retail | 2019 |
| RLG Capital Limited | Administrative & support | 2025 |
| RM and JW Property Ltd | Real estate | 2023 |
| RM2 Estates Ltd | Real estate | 2024 |
| Rmck Surveying Limited | Professional & scientific | 2026 |
| RMJ Plumbing & GAS Services Ltd | Construction | 2015 |
| Rmsl London Ltd | Hospitality | 2025 |
| Rmsl Ltd | Hospitality | 2025 |
| RN Brothers Ltd | Administrative & support | 2017 |
| Road Runner International Logistics Limited | Transport & logistics | 2020 |
| Roadliner UK Ltd | Transport & logistics | 2020 |
| ROB & Roxy Ltd | Transport & logistics | 2020 |
| ROB Shinn Photography Ltd | Information & communication | 2017 |
| Robbins Construction Ltd | Construction | 2020 |
| Robert Bell & Sons Ltd | Other services | 2026 |
| Robert Parish Limited | Real estate | 2014 |
| Roberts Crane Limited | Administrative & support | 2023 |
| Roberts-Wood Limited | Administrative & support | 2015 |
| Robotics Logistics Group Ltd | Construction | 2025 |
| ROC Management Consultancy Ltd | Professional & scientific | 2025 |
| Rockstar Foods Events Ltd | Hospitality | 2024 |
| Roding Motor World Limited | Wholesale & retail | 2019 |
| Rodings Place Residents Association Limited | Households | 2005 |
| Roffeys Holdings Ltd | Administrative & support | 2025 |
| Rogers Project Solutions Limited | Professional & scientific | 2021 |
| Rogna Homes Limited | Real estate | 2024 |
| ROI Nadin Ltd | Other services | 2019 |
| Rokeby Consulting Group Limited | Information & communication | 2024 |
| Rokka 462763 Ltd | Hospitality | 2020 |
| Rolda Civils Limited | Construction | 2019 |
| Ronan Mckenzie Limited | Professional & scientific | 2018 |
| Rooftop and Friends Holdings Limited | Financial services | 2025 |
| Rooftop and Friends Ltd | Hospitality | 2024 |
| Rooker Limited | Professional & scientific | 2015 |
| Rooms and Roofs Ltd | Real estate | 2026 |
| Roopa Nair Ltd | Health & social care | 2019 |
| Ropaal Limited | Health & social care | 2012 |
| ROS Russell Ltd | Administrative & support | 2022 |
| Roscommon Assets Ltd | Real estate | 2023 |
| Rose Caterers Ltd | Hospitality | 2024 |
| Rose Gold Health Ltd | Professional & scientific | 2021 |
| Rose Lane Convenience Limited | Wholesale & retail | 2015 |
| Rose Wicksteed Casting Limited | Administrative & support | 2017 |
| Rosedale Limited | Construction | 2018 |
| Rosenberg Properties Limited | Real estate | 2020 |
| Rosewood Arch Ltd | Financial services | 2019 |
| Roshan Security Limited | Administrative & support | 2020 |
| Rosmayer Limited | Professional & scientific | 2012 |
| Ross & Co Private Ltd | Administrative & support | 2020 |
| Rosso on the Broadway Limited | Hospitality | 2025 |
| Rostami Enterprises Ltd | Real estate | 2020 |
| Rosworth Consultancy Ltd | Professional & scientific | 2023 |
| Rowan Grove Management Company Limited | Real estate | 1997 |
| Rowan Orchid Architects Limited | Construction | 2008 |
| Rowlandson's Limited | Wholesale & retail | 1970 |
| Roxannalyssa Ltd | Professional & scientific | 2023 |
| Roxwell Services & Tyres Ltd | Wholesale & retail | 2012 |
| RPC Catering Limited | Hospitality | 2017 |
| Rplus Limited | Extraterritorial | 2012 |