| Reenchant Design Ltd | Professional & scientific | 2024 |
| Reflexology Heaven Limited | Health & social care | 2021 |
| Reformer Pilates Essex Limited | Arts & recreation | 2020 |
| Regal ARK Construction Ltd | Construction | 2012 |
| Regal Cross Limited | Other services | 2025 |
| Regal Transport Services Ltd | Transport & logistics | 2020 |
| Regency International (GB) Limited | Transport & logistics | 1999 |
| Regent Shipping Agencies Limited | Transport & logistics | 2000 |
| Regent Shipping Limited | Transport & logistics | 2023 |
| Regents Roofing Limited | Construction | 2025 |
| Regina Veneziana Ltd | Construction | 2020 |
| Regions Home Improvements Limited | Construction | 2026 |
| Rehcof Partners Ltd | Professional & scientific | 2023 |
| Reign Secure Limited | Construction | 2016 |
| Reimel Ltd | Wholesale & retail | 2022 |
| Rektekservices Limited | Transport & logistics | 2025 |
| Relaxsingh Ltd | Other services | 2018 |
| Reliance Auto Repair Ltd | Wholesale & retail | 2026 |
| Reliance Property Maintenance Limited | Construction | 2010 |
| Relicorps Ltd | Information & communication | 2019 |
| Relotec Limited | Other services | 2007 |
| Relyon GAS Services Limited | Other services | 2015 |
| Reminet Holdings Limited | Hospitality | 2023 |
| Remy's D&C Ltd | Administrative & support | 2025 |
| REN Mechanical Services Limited | Construction | 2018 |
| Rensburg Smile Design Limited | Health & social care | 2021 |
| Rentall Furniture Ltd. | Wholesale & retail | 2020 |
| Repto Limited | Hospitality | 2022 |
| Resa Properties Ltd | Real estate | 2019 |
| Rescue Read Ltd | Wholesale & retail | 2020 |
| Reshape Holdings Ltd | Construction | 2025 |
| Residential Window Cleaning Ltd | Administrative & support | 2017 |
| Resinova Properties Ltd | Real estate | 2025 |
| Resolved Support Limited | Administrative & support | 2026 |
| Retail 154 Holdings Limited | Administrative & support | 2018 |
| Retail Corp Ltd | Financial services | 2010 |
| Retink Limited | Education | 2026 |
| Revdesign Ltd | Manufacturing | 2026 |
| Revent Trading Limited | Hospitality | 2011 |
| Reventon Group Limited | Financial services | 2020 |
| Revitai Ltd | Information & communication | 2025 |
| Revxai Ltd | Information & communication | 2025 |
| Rexport LLP | | 2007 |
| Rezq Resight Limited | Extraterritorial | 2021 |
| RFC Group Ltd | Other services | 2024 |
| RFW Engineering Ltd | Wholesale & retail | 2017 |
| RG EYE Care Ltd | Health & social care | 2022 |
| RGSW19 Limited | Real estate | 2021 |
| RGSW22 Limited | Real estate | 2021 |
| RH Cafe Limited | Hospitality | 2023 |
| Rhino Roofing and Building Specialists Ltd | Construction | 2025 |
| Rhythm Time Hornchurch Ltd | Education | 2021 |
| Riaps Enterprise CIC | Public administration | 2025 |
| Rias Valeting Ltd | Administrative & support | 2025 |
| Riaz Mart Ltd | Wholesale & retail | 2025 |
| Richard Collinge & Associates Limited | Health & social care | 2022 |
| Richard Rail Limited | Construction | 2014 |
| Richardson’S Liberation CIC | Public administration | 2024 |
| Richer Blood Reptiles Limited | Other services | 2024 |
| Richer Lines Matter Ltd | Wholesale & retail | 2025 |
| Richie Billions Limited | Wholesale & retail | 2019 |
| Richkris Ltd | Real estate | 2018 |
| Richline Trading Ltd | Other services | 2024 |
| Richmoore Landscapes Ltd | Administrative & support | 2026 |
| Richwell Executives Ltd | Administrative & support | 2005 |
| RICK9 Ltd | Professional & scientific | 2022 |
| Riddick Carpentry Limited | Construction | 2011 |
| Ridgewell Electrical Services Ltd | Construction | 2019 |
| Right Furnishings Limited | Wholesale & retail | 2020 |
| Rightway Scaffolding Ltd | Construction | 2015 |
| Riky Limited | Information & communication | 2025 |
| Riley Contracts Ltd | Construction | 2023 |
| RIM Rescue Limited | Administrative & support | 2021 |
| Rinse Studio Ltd | Other services | 2026 |
| Rise & Shine Properties London Ltd | Real estate | 2024 |
| Rise Sports Ltd | Arts & recreation | 2019 |
| Rise Three Holdings Ltd | Health & social care | 2024 |
| Rism Estates Limited | Real estate | 2020 |
| Rivendell AI Limited | Information & communication | 2026 |
| Rivendell Shire Limited | Real estate | 2018 |
| River Ocean Floors Ltd | Construction | 2014 |
| River Services Limited | Financial services | 2025 |
| Riverside Retreats Ltd | Hospitality | 2022 |
| Riviera Realty Ltd | Real estate | 2025 |
| RJ Commerce Ltd | Wholesale & retail | 2026 |
| RJ Global Consulting Ltd | Transport & logistics | 2026 |
| RJ1 Training Ltd | Other services | 2015 |
| RJC Investment Group Ltd | Real estate | 2022 |
| Rjga Property Limited | Real estate | 2022 |
| RK Neppalli Ltd | Health & social care | 2025 |
| RKM1 (Holdings) Ltd | Financial services | 2026 |
| RKM1 Properties Limited | Real estate | 2025 |
| RLC Leadership Consults Ltd | Administrative & support | 2021 |
| RLX Limited | Financial services | 2019 |
| RLX Needles Limited | Other services | 2019 |
| RM Repairs & Maintenance Limited | Other services | 2012 |
| RM Roofing & Waterproofing Ltd | Construction | 2018 |
| RMB Properties Limited | Real estate | 2014 |
| RMH Security Systems Limited | Administrative & support | 2025 |
| RMT Clinic Co Ltd | Health & social care | 2021 |