| RC Chai Kingston Ltd | Hospitality | 2024 |
| RCJ Law Limited | Professional & scientific | 2014 |
| Reactive Property Solutions Limited | Construction | 2015 |
| Really Nice Software Limited | Information & communication | 2025 |
| Realme Ltd | Other services | 2022 |
| Rebecca Richmond Advisory Services Ltd | Professional & scientific | 2025 |
| Rebecca Wilson Limited | Health & social care | 2019 |
| Rebel Angel Ltd | Financial services | 2020 |
| Rebelde Publishing Limited | Information & communication | 2018 |
| REC to REC Limited | Administrative & support | 2008 |
| Rechtuijt Tax Advisers LLP | | 2020 |
| Recommended PUB Company Limited | Hospitality | 2006 |
| Recruited Search Ltd | Administrative & support | 2021 |
| Red Balloon Touring Limited | Arts & recreation | 2019 |
| Red Deer Investments | Financial services | 2014 |
| Red Mulberry Consulting Limited | Professional & scientific | 2020 |
| Red Rock Burgers Ltd | Hospitality | 2024 |
| Redbird Consulting & Business Services Limited | Professional & scientific | 2017 |
| Redlington Limited | Financial services | 2013 |
| Reedsfield Associates Limited | Construction | 2013 |
| Reemy Medicare Ltd | Real estate | 2020 |
| Reflect CKD Limited | Arts & recreation | 2018 |
| Reflect Merchandise Limited | Wholesale & retail | 2019 |
| Reflect TIE Limited | Education | 2015 |
| Reflect Ventures Limited | Real estate | 2024 |
| Regal Credit Consultants Limited | Administrative & support | 1982 |
| Regal House Kingston (Management) Limited | Real estate | 2003 |
| Regency Freight Services Limited | Transport & logistics | 2015 |
| Regency Maintenance Ltd | Construction | 2019 |
| Regency Place (Chertsey) Residents Management Company Limited | Households | 2005 |
| Regency Plumbing & Heating Ltd | Manufacturing | 2017 |
| Regency Renovation and Management Limited | Real estate | 1996 |
| Regency Shipping Limited | Transport & logistics | 1995 |
| Regents Court Kingston RTM Company Limited | Real estate | 2026 |
| Regulation & Compliance Office Ltd | Professional & scientific | 2024 |
| Rejoice by Mimoza Ltd | Professional & scientific | 2026 |
| Rejoy Limited | Administrative & support | 2016 |
| REL Property Surrey Limited | Real estate | 2023 |
| REL Solutions Limited | Administrative & support | 2008 |
| Reliable Healthcare Group Limited | Administrative & support | 2016 |
| Rellington Limited | Administrative & support | 2000 |
| Relocating UK Workforce Limited | Real estate | 2020 |
| Relocation Home Solutions Ltd | Real estate | 2024 |
| Remap Works Limited | Information & communication | 2023 |
| Remedy Apparel Limited | Wholesale & retail | 2020 |
| Remedy Innovations Limited | Administrative & support | 2021 |
| Remedy Ltd. | Health & social care | 2016 |
| Remedy Pro Limited | Health & social care | 2025 |
| Remos Partners Ltd | Professional & scientific | 2024 |
| Remote Medical Solutions Ltd | Health & social care | 2022 |
| Remyx London Ltd | Wholesale & retail | 2026 |
| Renas 1 Limited | Hospitality | 2019 |
| Rendersafe LLP | | 2022 |
| Renew Together Property Services Ltd | Construction | 2025 |
| Renovara Ltd | Wholesale & retail | 2024 |
| Rental Potential Ltd | Administrative & support | 2021 |
| Rentd Financial Services Ltd | Financial services | 2024 |
| Rentd Rewards Limited | Professional & scientific | 2025 |
| RENTS2U Ltd | Real estate | 2023 |
| Reomark Business Limited | Financial services | 2014 |
| Replit UK Limited | Information & communication | 2026 |
| Reru Limited | Information & communication | 2014 |
| Residently Services (UK) Limited | Information & communication | 2017 |
| Resolve Civil Engineering Limited | Construction | 2023 |
| Resolve Financial Planning Ltd | Extraterritorial | 2011 |
| Resonant Strategies Limited | Professional & scientific | 2025 |
| Response Services Group UK Ltd | Health & social care | 2013 |
| Rethink Architecture Limited | Professional & scientific | 2012 |
| Reva Developments Ltd | Construction | 2015 |
| Reveal Media Limited | Information & communication | 2002 |
| Revelation TV Limited | Extraterritorial | 2000 |
| Revell Davies Law Limited | Professional & scientific | 2012 |
| Revenue Rocket Ltd | Professional & scientific | 2023 |
| Revival Tees Ltd | Wholesale & retail | 2023 |
| Revnik Soft Solutions Ltd | Wholesale & retail | 2012 |
| Rewired Digital Ltd | Information & communication | 2026 |
| REX Marble Limited | Construction | 2002 |
| Reynolds Translations Limited | Professional & scientific | 2013 |
| RF Design Services Limited | Professional & scientific | 2025 |
| RG Properties Management Ltd | Real estate | 2022 |
| Rgbbristol Ltd | Education | 2024 |
| Rgcleaners Ltd | Administrative & support | 2025 |
| Rgjg Properties UK Ltd | Administrative & support | 2017 |
| RH Faulkner & Daughter Ltd | Other services | 2021 |
| Rhodas Consulting Limited | Information & communication | 2012 |
| Rhov Management Holdings Limited | Financial services | 2017 |
| Rhov Property Consulting Limited | Administrative & support | 2017 |
| Rhov Property Limited | Real estate | 2017 |
| RHV Advisory Ltd | Professional & scientific | 2024 |
| Rich & Humble Ltd | Wholesale & retail | 2026 |
| Rich Curry Consultancy Limited | Professional & scientific | 2024 |
| Richard Carrington Advisory Limited | Professional & scientific | 2025 |
| Richard Hall Limited | Construction | 2006 |
| Richard Mcgrann Creative Ltd | Professional & scientific | 2025 |
| Richard Senger Ltd | Professional & scientific | 2021 |
| Richard Snelgrove UK Limited | Information & communication | 2017 |
| Richards & Lucas Limited | | 1971 |
| Richardson Rentals Limited | Real estate | 2025 |
| Richedwards Ltd | Information & communication | 2022 |
| Richmond Court RTM Company Limited | Households | 2007 |