| Rectus Ltd | Construction | 2015 |
| Red Bricks Solutions Limited | Wholesale & retail | 2016 |
| Red Face Plant Hire Limited | Administrative & support | 2012 |
| Red Giant Retail Ltd | Wholesale & retail | 2024 |
| Reda Construction Solutions Ltd | Construction | 2026 |
| Reel Time News Ltd | Information & communication | 2026 |
| Reeltalk News Ltd | Information & communication | 2026 |
| Refine Stone Ltd | Manufacturing | 2025 |
| Reflex Construction Ltd | Construction | 2014 |
| Regal Corporation UK Limited | Professional & scientific | 1999 |
| Regal London Limited | Hospitality | 2006 |
| Regent's Court (Pinner) Limited | Real estate | 2004 |
| Regents Court (Pinner) RTM Management Company Limited | Other services | 2005 |
| Register Direct Ltd | Hospitality | 2014 |
| Regveda Limited | Real estate | 2025 |
| Rehncy Holdings Ltd | Information & communication | 2023 |
| Rehncy Real Estates Limited | Real estate | 2023 |
| REI Consulting Limited | Information & communication | 2009 |
| Reiss Goldman Limited | Professional & scientific | 2016 |
| Rejan Roofin Ltd | Manufacturing | 2024 |
| Rekstone Ltd | Administrative & support | 2013 |
| Reliable Certification Ltd | Professional & scientific | 2021 |
| Reliable International Ltd | Wholesale & retail | 2024 |
| Religa Limited | Manufacturing | 2021 |
| Relocation Services Ltd | Construction | 2019 |
| Reluga Building Services Ltd | Construction | 2016 |
| Rely Remit Limited | Financial services | 2015 |
| Removals Heroes Ltd | Transport & logistics | 2025 |
| Removals Limited | Extraterritorial | 1984 |
| REN Renovation Ltd | Construction | 2018 |
| Renate DRY Cleaning Ltd | Other services | 2024 |
| Renate Services Ltd | Other services | 2024 |
| Rene Nails CT Ltd | Other services | 2025 |
| Renewed Care Solutions Limited | Administrative & support | 2020 |
| Renova DA Ltd | Construction | 2026 |
| Rent Ready Properties Limited | Real estate | 2026 |
| Rental Rooms Ltd | Other services | 2017 |
| Renterprise Ltd | Real estate | 2025 |
| Repair Worx Ltd | Wholesale & retail | 2022 |
| Repairgo Ltd | Other services | 2024 |
| Research & Education Consulting Ltd | Education | 2026 |
| Resonance Building Ltd | Construction | 2022 |
| Resource Environmental Management Ltd | Construction | 2019 |
| Restoration Limited. | Administrative & support | 1992 |
| Restoration Media LLP | | 2026 |
| Restoration Partners Limited | Professional & scientific | 2006 |
| Restoration Publishing Ltd | Administrative & support | 2024 |
| Restoration Revival Fellowship | Other services | 2009 |
| RESTORE180 - Healthcare Staffing Ltd | Public administration | 2021 |
| Retail Mingle Limited | Professional & scientific | 2025 |
| Retdom Limited | Wholesale & retail | 2025 |
| Retro Coffee Ltd | Wholesale & retail | 2018 |
| Revenue Inflation Ltd | Professional & scientific | 2017 |
| REX Studios Ltd | Professional & scientific | 2022 |
| Reylis Ltd | Wholesale & retail | 2023 |
| Reza Events Limited | Hospitality | 2025 |
| Rfpp Properties Limited | Construction | 2024 |
| RGJ Construction Ltd | Construction | 2012 |
| Rgvr Limited | Wholesale & retail | 2021 |
| Rhivashay Property Limited | Real estate | 2020 |
| Rhola Limited | Wholesale & retail | 2025 |
| Rhyan Courier Services Ltd | Transport & logistics | 2023 |
| Rhyan Homes Limited | Real estate | 2024 |
| Rhythm and Rhyme RT Limited | Administrative & support | 2014 |
| RIA Paige Studio Ltd | Professional & scientific | 2025 |
| Rian World Limited | Professional & scientific | 2017 |
| Riaz Household Ltd | Wholesale & retail | 2019 |
| Ricestylers Ltd | Hospitality | 2025 |
| Richdale Health Centres Limited | Health & social care | 1997 |
| Richdales Developments Limited | Real estate | 2022 |
| Richmond Films Limited | Information & communication | 2021 |
| Ridz Technologies Ltd | Information & communication | 2026 |
| Right Deals Trading Limited | Wholesale & retail | 2020 |
| Riizen Gurungs Ltd | Real estate | 2023 |
| Rijac Properties Limited | Real estate | 1977 |
| Rinx Tech Ltd | Manufacturing | 2015 |
| Rinzis Propery Ltd | Construction | 2022 |
| Rise Health Limited | Health & social care | 2022 |
| Rishil Global Holdings Ltd | Professional & scientific | 2025 |
| Risk Analyst Consultants (UK) Limited | Financial services | 2020 |
| Ristorante Bellavista Limited | Real estate | 1967 |
| Ritan Mehta Ltd | Other services | 2012 |
| Rite Property Investment Ltd | Real estate | 2020 |
| Rivah Digital Ltd | Information & communication | 2023 |
| Riven Homes Ltd | Real estate | 2019 |
| Riversun Limited | Information & communication | 2013 |
| Rizelle Ltd | Real estate | 2025 |
| Rizeon Limited | Manufacturing | 2005 |
| RJ Accessories Limited | Wholesale & retail | 2024 |
| RJ Construction Services Ltd | Construction | 2023 |
| RJ Fintech Ltd | Financial services | 2013 |
| RJ GAS and Plumbing Limited | Construction | 2011 |
| RJ Global Solutions Limited | Professional & scientific | 2010 |
| RJ Retailer Limited | Wholesale & retail | 2026 |
| RJC 266 Limited | Real estate | 2022 |
| RJD Global Ltd | Wholesale & retail | 2025 |
| RK Deli Ltd | Hospitality | 2018 |
| RK Trading Global Limited | Wholesale & retail | 2025 |
| RL Builders Ltd | Construction | 2020 |
| RLD Medical Group Limited | Health & social care | 2025 |