| RBR Holdings Limited | Financial services | 2026 |
| RBR Trading Holdings Ltd | Financial services | 2026 |
| Rbri Limited | Real estate | 2026 |
| RBS DRY Linings Limited | Construction | 2013 |
| Rbtrendz Limited | Wholesale & retail | 2024 |
| Rbzonlineretail Ltd | Wholesale & retail | 2025 |
| RC Catering London Ltd | Hospitality | 2023 |
| RC Fashion Limited | Wholesale & retail | 2011 |
| RC POL Services Ltd | Wholesale & retail | 2022 |
| RC Trafford Road Ltd | Real estate | 2022 |
| RC Uphill Ltd | Transport & logistics | 2022 |
| Rcag Ltd | Health & social care | 2024 |
| RCD Utility Services Limited | Construction | 2003 |
| RCH Care Group Holdings Limited | Health & social care | 2014 |
| RCH Care Homes Limited | Health & social care | 1988 |
| Rchc Ltd | Administrative & support | 2016 |
| RCM Consultancies Ltd | Health & social care | 2013 |
| Rconnected Ltd | Information & communication | 2021 |
| RCS Enterprises Ltd | Wholesale & retail | 2026 |
| RCS Properties & Investments Ltd | Real estate | 2024 |
| Rcsuk Ltd | Wholesale & retail | 2022 |
| RD Brentwood Ltd | Real estate | 2025 |
| RD Interim Solutions Limited | Information & communication | 2014 |
| RD Properties Investment Ltd | Real estate | 2022 |
| RD Property Portfolio Limited | Real estate | 2020 |
| Rd&K Construction Ltd | Construction | 2018 |
| RDA GAS and Electrical Services Limited | Construction | 2015 |
| Rdas Consultancy Services (UK) Limited | Professional & scientific | 2023 |
| Rdbm Ltd | Construction | 2022 |
| Rdcon Ltd | Construction | 2025 |
| Rdkd Properties Limited | Real estate | 2023 |
| RDL Management Services Ltd | Other services | 2014 |
| RDM Food Limited | Hospitality | 2016 |
| RDM Search Ltd | Administrative & support | 2025 |
| RDN London Limited | Administrative & support | 2015 |
| RDP Hair Limited | Other services | 2014 |
| Re-Lcd Ltd | Other services | 2018 |
| Re:Set Education Ltd | Education | 2023 |
| REA UK Services Ltd | Transport & logistics | 2025 |
| Reach Staff UK Ltd | Health & social care | 2019 |
| REACH2CARE Services Ltd | Health & social care | 2019 |
| Reachgorilla Ltd | Wholesale & retail | 2023 |
| React London Property Maintenance Ltd | Construction | 2024 |
| React Property Services Ltd | Construction | 2017 |
| Read Academy Education | Education | 2013 |
| Read Corporate Ltd | Real estate | 2019 |
| Reading Hotel Operating Company Ltd. | Hospitality | 2014 |
| Ready 2 Buy Ltd | Wholesale & retail | 2019 |
| Ready Help Care Ltd | Health & social care | 2025 |
| Ready Made Food Ltd | Extraterritorial | 2024 |
| Ready Steady Charge.Com Ltd | Construction | 2021 |
| Reagan Financial Consultancy Ltd | Professional & scientific | 2010 |
| Real Beijing Restaurant Limited | Hospitality | 2008 |
| Real Brand Store Limited | Wholesale & retail | 2024 |
| Real Buildcon Private Ltd | Construction | 2025 |
| Real Crescent Ltd | Real estate | 2025 |
| Real Developers Limited | Construction | 2021 |
| Real Estate GROUP1 Ltd | Real estate | 2025 |
| Real Faizi Limited | Wholesale & retail | 2026 |
| Real Fiza Groups Ltd | Wholesale & retail | 2026 |
| Real-Time Reporting Limited | Professional & scientific | 2007 |
| Reality Properties Ltd | Real estate | 2018 |
| Really Construction Ltd | Construction | 2024 |
| Realm Prime Properties Ltd | Real estate | 2021 |
| Realnoventra Ltd | Wholesale & retail | 2025 |
| Realt Homes Ltd | Households | 2025 |
| Reap & SOW Ltd | Manufacturing | 2019 |
| Reassure Properties Ltd | Construction | 2024 |
| Rebecca Associates Ltd | Extraterritorial | 2012 |
| Reber Global Ltd | Wholesale & retail | 2024 |
| Rebus Leather (UK) Limited | Wholesale & retail | 2009 |
| REC Holdings Services Ltd. | Other services | 2019 |
| Reckton Solutions Ltd | Administrative & support | 2023 |
| Recommit Limited | Wholesale & retail | 2023 |
| Recon My Engine Limited | Wholesale & retail | 2019 |
| Recore Accounts Ltd | Professional & scientific | 2023 |
| Recruit Workforce Ltd | Administrative & support | 2019 |
| Recruitment Matters International Ltd | Professional & scientific | 2008 |
| Rectory Court Developments Ltd | Real estate | 2021 |
| Recycle International Limited | Water & waste | 2009 |
| RECYCLEM8 Limited | Administrative & support | 2025 |
| Red & White Company Limited | Professional & scientific | 2015 |
| Red Bricks Construction UK Ltd | Construction | 2020 |
| Red Bull Meat Ltd | Manufacturing | 2026 |
| Red Chai Limited | Real estate | 2020 |
| Red Dice Recruitment Limited | Administrative & support | 2025 |
| Red Falcon Security Services Ltd | Administrative & support | 2021 |
| Red Fashion House Ltd | Wholesale & retail | 2012 |
| Red Icon T/A Openhouse SW London Ltd | Information & communication | 2019 |
| Red Key Consultants Ltd | Real estate | 2019 |
| Red Lion Convenient Stores Ltd | Wholesale & retail | 2023 |
| Red Pacific Solutions London Ltd | Real estate | 2017 |
| Red Paragon Consulting Ltd | Professional & scientific | 2019 |
| Red Properties Investment Limited | Real estate | 2024 |
| Red Rock Commercial Ltd | Other services | 2019 |
| Red Sky Product Ltd | Extraterritorial | 2022 |
| Redany Limited | Transport & logistics | 2023 |
| Redbanx Limited | Financial services | 2016 |
| Redbeard Satellite Ltd | Wholesale & retail | 2024 |
| Redbery Ltd | Wholesale & retail | 2020 |