| Regent Cafe CIC | Hospitality | 2026 |
| Regent Court Bawtry Ltd | Households | 2019 |
| Regent Hotel (Doncaster) Limited | Hospitality | 1961 |
| Regent Serviced Suites Limited | Hospitality | 2017 |
| Regent Square Residentials Limited | Construction | 2026 |
| Regfa Limited | Financial services | 2018 |
| Regional Auctioneers Ltd | Professional & scientific | 2013 |
| Regional Groundwork Ltd | Construction | 2013 |
| Regional Surfacing Ltd | Administrative & support | 2014 |
| Regright Ltd | Professional & scientific | 2025 |
| Rehabilitate Therapy Limited | Other services | 2014 |
| Rehoboth Care Properties and Care Solutions Ltd | Financial services | 2019 |
| Reiki Light Works Ltd | Extraterritorial | 2022 |
| Reiki Moon Limited | Wholesale & retail | 2023 |
| Reins & Roots CIC | Health & social care | 2026 |
| Reiss Delaney TM Ltd | Public administration | 2025 |
| Reiss Estates Ltd | Real estate | 2025 |
| Rejus Construction Limited | Construction | 2013 |
| Rejus Limited | Real estate | 2000 |
| Rejuvenair a Holistic Healing Sanctuary Ltd | Other services | 2023 |
| Relate Nottinghamshire | Other services | 2001 |
| Relationship Living Ltd | Professional & scientific | 2026 |
| Relative Media Limited | Administrative & support | 2011 |
| Relay Taxis (Doncaster) Limited | Transport & logistics | 2024 |
| Release Performance Ltd | Education | 2026 |
| Release Performance Property Solutions Limited | Real estate | 2023 |
| Relevant Properties Ltd | Real estate | 2024 |
| Reliable LED Ltd | Other services | 2010 |
| Reliable Unique Safe Scaffolding Ltd. | Construction | 2025 |
| Reliant Resource Services Limited | Administrative & support | 2021 |
| Relianze Group Ltd | Real estate | 2019 |
| Relief Point Ltd | Professional & scientific | 2026 |
| Relu Haulage Ltd | Transport & logistics | 2020 |
| Relveo Systems Ltd | Information & communication | 2026 |
| Remi Transport Ltd | Transport & logistics | 2025 |
| Remiktransport Ltd | Transport & logistics | 2019 |
| Remotorvate Recovery Limited | Transport & logistics | 2017 |
| Rendkarn Limited | | 1980 |
| Renees Services Ltd | Health & social care | 2015 |
| Renew Access & Security Ltd | Construction | 2017 |
| Renew HER CIC | Education | 2026 |
| Renewable Sales and Service Solutions Ltd | Construction | 2024 |
| Renewables Three Limited | Administrative & support | 2015 |
| Renmic Property Investment Limited | Real estate | 2004 |
| Renna.Anna.Bella Ltd | Wholesale & retail | 2021 |
| RENOV8 Roofing Ltd | Construction | 2025 |
| Renovationsprayuk Ltd | Construction | 2023 |
| Renove Immobilier Limited | Real estate | 2017 |
| Renowned Group Ltd | Construction | 2024 |
| Renowned Recruitment Services Ltd | Administrative & support | 2021 |
| Renrut International Limited | Administrative & support | 2023 |
| Rent Bridge Ltd | Real estate | 2023 |
| Rent Doncaster Ltd | Real estate | 2016 |
| Renteer Homes Limited | Real estate | 2020 |
| Renthouse Ltd | Real estate | 2025 |
| Renuvo Aesthetics Ltd | Other services | 2022 |
| Renuvo Beauty Ltd | Other services | 2020 |
| REP Group Limited | Wholesale & retail | 2020 |
| Repair App Limited | Households | 2021 |
| Repair My Technology Ltd | Other services | 2025 |
| Repchoice Limited | Wholesale & retail | 1985 |
| Repipe Plumbing&Heating Ltd | Manufacturing | 2014 |
| Repossessions-Uk Limited | Administrative & support | 1996 |
| Represent Trading Ltd | Wholesale & retail | 2019 |
| Repurpose I.T Ltd | Other services | 2022 |
| Request to PAY Solutions Ltd | Construction | 2025 |
| Requested Refund Ltd | Extraterritorial | 2025 |
| Resco Properties Management Ltd | Real estate | 2025 |
| Research and Innovation Center Ltd | Manufacturing | 2026 |
| Reservation Providers Ltd | Professional & scientific | 2024 |
| Resgl Blue Light Ltd | Wholesale & retail | 2023 |
| Reshape Wellbeing Limited | Health & social care | 2026 |
| Resida Management Ltd | Real estate | 2007 |
| Resilience United CIC | Health & social care | 2022 |
| Resin Bound Renovations Ltd | Construction | 2024 |
| Resin Building Products Holdings Limited | Financial services | 2018 |
| Resin Building Products Ltd | Construction | 1995 |
| Resin Driveways Yorkshire Ltd | Construction | 2025 |
| Resin Pro Limited | Wholesale & retail | 2020 |
| Resin Property Holdings Ltd | Financial services | 2018 |
| Resistor Investments Ltd | Real estate | 2024 |
| Resko Pizza Limited | Hospitality | 2023 |
| Resolute Investment Group Ltd | Professional & scientific | 2015 |
| Resolution Construction Limited | Construction | 2025 |
| Resolution Roofing Limited | Construction | 2022 |
| Resonance Medicine Ltd | Administrative & support | 2020 |
| Resonate Electrical & Security Ltd | Construction | 2021 |
| Resource Support Services Limited | Construction | 2020 |
| Respect Funeral Services Ltd | Other services | 2023 |
| Respect, Innovation and Integrity Through Sport & Education CIC | Arts & recreation | 2021 |
| Respectful Observations Ltd | Information & communication | 2026 |
| Restaur Artelia Ltd | Manufacturing | 2025 |
| Restaurant Augustine Limited | Hospitality | 2017 |
| Restay Ltd | Real estate | 2023 |
| Restore Group Inc Ltd | Construction | 2023 |
| Result XL Ltd. | Financial services | 2009 |
| Retail Sales Expansion UK Ltd | Wholesale & retail | 2009 |
| Retford Senior Care Services Limited | Health & social care | 2015 |
| Rethync Ltd | Construction | 2016 |
| Retravaillé Ltd | Wholesale & retail | 2024 |