| Resolution FM Limited | Administrative & support | 2011 |
| Resolved Limited | Administrative & support | 2013 |
| Resona Limited | Real estate | 2012 |
| Resource Provider Ltd | Wholesale & retail | 2024 |
| Resource Revolution Group Limited | Mining & quarrying | 2025 |
| Resourcing & Limited | Administrative & support | 2023 |
| Responsible Care Limited | Health & social care | 2018 |
| Resso Group Limited | Financial services | 2020 |
| Resso Holdings Ltd | Administrative & support | 2014 |
| Rest in Horley Ltd | Hospitality | 2025 |
| Restillow Limited | Financial services | 2023 |
| Restor (Stanmore) Ltd | Health & social care | 2023 |
| Restor Ltd | Other services | 2022 |
| Restore Physio Clinic Ltd | Health & social care | 2026 |
| Restoring Empowerment Psychotherapy Ltd | Health & social care | 2021 |
| Resultancy Limited | Professional & scientific | 1997 |
| Results Business Coaching Ltd | Administrative & support | 2021 |
| Resv Enterprise Ltd | Wholesale & retail | 2025 |
| Retail AID Ltd | Information & communication | 2016 |
| Retail Huddle Limited | Professional & scientific | 2022 |
| Retail Revolt Ltd | Information & communication | 2025 |
| Retbond Limited | Professional & scientific | 2013 |
| Rethink Later Life Limited | Financial services | 2024 |
| Retro Universe Ltd | Wholesale & retail | 2025 |
| Retroco Limited | Arts & recreation | 1991 |
| Return Ticket Ltd | Information & communication | 2024 |
| Return to Movement Ltd | Other services | 2023 |
| Reva River Ltd | Hospitality | 2025 |
| Revere Realty Ltd | Real estate | 2025 |
| Reverend Close Limited | Households | 2010 |
| Reverse Time Machine Limited | Information & communication | 2014 |
| Revira Limited | Information & communication | 2023 |
| Reviso Cloud Accounting Limited | Information & communication | 2015 |
| Revista Limited | Wholesale & retail | 2017 |
| Revita Limited | Real estate | 2020 |
| Revita MED Aesthetics Limited | Health & social care | 2023 |
| Revital Stores Limited | Real estate | 2022 |
| Revive Health Care Ltd | Administrative & support | 2016 |
| Revore London Ltd | Wholesale & retail | 2026 |
| Revotech Solutions Limited | Manufacturing | 2024 |
| Revox B77 Limited | Wholesale & retail | 2020 |
| Revsynq Limited | Information & communication | 2025 |
| Rewardstick GB Limited | Information & communication | 2023 |
| Rewine Recruitment Limited | Wholesale & retail | 2022 |
| Rexliz Healthcare Limited | Health & social care | 2023 |
| REY Engineering Solutions Ltd | Information & communication | 2014 |
| REY Property Investments Ltd | Real estate | 2018 |
| Reyansh Limited | Health & social care | 2015 |
| Reymas Limited | Real estate | 2023 |
| Reynold United Ltd | Wholesale & retail | 2016 |
| Reynolds Groundwork Services Limited | Construction | 2006 |
| Reynolds Property Developments Limited | Construction | 2021 |
| Reyvin Health Limited | Professional & scientific | 2023 |
| Reyvin Limited | Arts & recreation | 2022 |
| Reza Corporation Ltd | Health & social care | 2014 |
| Reza Group Limited | Professional & scientific | 2020 |
| RFC Peri Peri Chicken Limited | Wholesale & retail | 2020 |
| Rfgs Investments Limited | Real estate | 2024 |
| RFS DRY Cleaning Suppliers Ltd | Wholesale & retail | 2023 |
| RFW Estates Limited | Hospitality | 2025 |
| RG Berkshire Properties Ltd | Real estate | 2020 |
| RG Design Engineer Limited | Professional & scientific | 2026 |
| RG Insolvency Limited | Professional & scientific | 2017 |
| RG Insolvency Trustee Limited | Professional & scientific | 2024 |
| RG Mctague Ltd | Professional & scientific | 2019 |
| RG Services London Ltd | Wholesale & retail | 2021 |
| RGA Innovation Limited | Construction | 2019 |
| Rgab Ltd | Wholesale & retail | 2026 |
| Rggd Consulting Limited | Other services | 2020 |
| Rgmd World Ltd | Administrative & support | 2012 |
| Rgmkc Ltd | Real estate | 2023 |
| RGR Events Ltd | Financial services | 2026 |
| RGS Intellect Ltd | Information & communication | 2015 |
| RGT Estates UK Ltd | Real estate | 2025 |
| RH Carthew Services Ltd | Professional & scientific | 2025 |
| RH Elite Investments Ltd | Administrative & support | 2025 |
| RH Fortuity Estates Ltd | Real estate | 2024 |
| RH Investment Capital Ltd | Real estate | 2020 |
| RH Primary Care Limited | Health & social care | 2022 |
| RH Waste Ltd | Water & waste | 2024 |
| RHA Clinics Limited | Financial services | 2021 |
| Rhanaya Consultancy Ltd | Health & social care | 2018 |
| RHD Property Investments Limited | Real estate | 2017 |
| Rheavek Ltd | Real estate | 2024 |
| Rhodesco Ltd | Real estate | 2025 |
| Rhydan Solutions Limited | Health & social care | 2019 |
| Rhym Property Group Ltd | Real estate | 2025 |
| Rhyme Ltd | Wholesale & retail | 2020 |
| Rhymes for Little Minds Ltd | Wholesale & retail | 2020 |
| Rhynikrav Ltd | Real estate | 2017 |
| Rhys Benjamin Ltd | Other services | 2017 |
| Rhythm Haven Limited | Hospitality | 2025 |
| Rhythmic Healing Limited | Health & social care | 2020 |
| RI Delta Ltd | Professional & scientific | 2011 |
| RI2K Limited | Manufacturing | 2000 |
| RIA Consulting Limited | Administrative & support | 2002 |
| Riaan K Limited | Real estate | 2021 |
| Rialto Social Limited | Hospitality | 2026 |
| Riana Ltd | Construction | 2023 |
| Riaz Khin Limited | Health & social care | 2022 |