| Rahf Renewables Limited | Construction | 2025 |
| RAL Associates (Consultancy Services) Limited | Professional & scientific | 2015 |
| RAL Associates Limited | Professional & scientific | 2020 |
| Ramp Electrical Ltd | Construction | 2020 |
| Ramper Construction Limited | Construction | 1992 |
| Ransford Electrical Services Limited | Construction | 2005 |
| Ranskill Farms Limited | Agriculture & fishing | 2000 |
| Ranskill Management Company Limited | Households | 2004 |
| Ranskill Motors Limited | Administrative & support | 2019 |
| Rbig Corporate Risk Services Limited | Professional & scientific | 1989 |
| Rbig Financial Services Limited | Financial services | 1989 |
| Rbig Limited | Financial services | 2009 |
| RC Civils & Construction Services Limited | Construction | 2022 |
| RCS Trustee Limited | Extraterritorial | 2026 |
| Rdac Properties Limited | Real estate | 2025 |
| Reach Wellness Limited | Administrative & support | 2003 |
| Reader Cement Products Limited | Manufacturing | 1995 |
| Reajb Ltd | Real estate | 2026 |
| Rebecca Wimble Limited | Financial services | 2017 |
| Rebuilding Ukraine C.I.C. | Health & social care | 2022 |
| Recognised Marketing Ltd | Professional & scientific | 2026 |
| Recovery Rising Ltd | Health & social care | 2024 |
| Rectors Gate Management Limited | Households | 1998 |
| Red 2 Black Recoveries Limited | Administrative & support | 2008 |
| Redbearofficial Ltd | Wholesale & retail | 2023 |
| Redg Consultancy Limited | Professional & scientific | 2012 |
| Redmen Developments Limited | Construction | 2004 |
| Redmen Property Ltd | Real estate | 2021 |
| Redwood Scholars (Derby) Limited | Education | 2017 |
| Redwood Scholars Tuition Ltd | Health & social care | 2021 |
| Reep Foundation Limited | Arts & recreation | 2024 |
| Refine Treatments Ltd | Other services | 2022 |
| Refinesurgical Ltd | Health & social care | 2020 |
| Reform Civils Ltd | Construction | 2025 |
| Reformed Property Management Ltd | Administrative & support | 2025 |
| Regenscape Biodiversity Ltd | Professional & scientific | 2026 |
| Rennspeed Limited | Manufacturing | 2007 |
| RENT4SURE Ltd | Administrative & support | 2009 |
| Resolution M&E Limited | Professional & scientific | 2025 |
| Resysten Medical Limited | Administrative & support | 2023 |
| Retainright Solutions Ltd | Professional & scientific | 2024 |
| Retford & Worksop (Chesterfield Canal) Boat Club Limited | Hospitality | 1966 |
| Retford ALL Events Catering Ltd | Hospitality | 2024 |
| Retford Auto Centre Limited | Wholesale & retail | 2024 |
| Retford Auto Electrical Limited | Wholesale & retail | 2014 |
| Retford Baptist Church | Other services | 2007 |
| Retford Business Forum C.I.C. | Professional & scientific | 2013 |
| Retford Chiropractic Clinic Ltd | Health & social care | 2003 |
| Retford Craft House Limited | Hospitality | 2025 |
| Retford Engineering Services Limited | Wholesale & retail | 2011 |
| Retford FC Juniors Ltd | Arts & recreation | 2008 |
| Retford Fencing Ltd | Manufacturing | 2017 |
| Retford Fisheries Ltd | Wholesale & retail | 2012 |
| Retford Football Club | Arts & recreation | 2021 |
| Retford Football Club 3G Limited | Arts & recreation | 2026 |
| Retford Fred's Limited | Hospitality | 2015 |
| Retford Glass & Glazing Ltd | Construction | 2017 |
| Retford Glass Centre Ltd | Construction | 2014 |
| Retford Golf Club Limited (the) | Arts & recreation | 1973 |
| Retford Holdings Limited | Real estate | 2022 |
| Retford Market Ltd | Wholesale & retail | 2023 |
| Retford Masonic Hall Limited | Other services | 1962 |
| Retford Minimix Limited | Extraterritorial | 2010 |
| Retford One Limited | Real estate | 2012 |
| Retford Paranormal Research UK Ltd | Other services | 2024 |
| Retford Paving Ltd | Construction | 2010 |
| Retford Physio Clinic Limited | Health & social care | 2017 |
| Retford Physiotherapy and Pilates Practice Limited | Health & social care | 2017 |
| Retford Property Management Ltd | Real estate | 2014 |
| Retford Property Services Ltd | Construction | 2013 |
| Retford Ready MIX Concrete & Screed Ltd | Manufacturing | 2013 |
| Retford Salad Bar Ltd | Hospitality | 2026 |
| Retford Snooker Ltd | Arts & recreation | 2024 |
| Retford Squash Club Limited | Arts & recreation | 1979 |
| Retford Surfacing Solutions Ltd | Construction | 2020 |
| Retford Together CIC | Other services | 2024 |
| Retford United Football Club Limited | Arts & recreation | 2018 |
| Revival Graphics Ltd | Professional & scientific | 2024 |
| Revival Music Ltd | Information & communication | 2025 |
| Revive Doncaster Ltd | Other services | 2006 |
| Revolution Mobile Ltd | Information & communication | 2014 |
| Reynolds Carpentry & Building Services Ltd | Construction | 2018 |
| RFB Engineering Limited | Professional & scientific | 2004 |
| RH & RB Limited | Real estate | 2023 |
| RHS Agri Services Limited | Agriculture & fishing | 2025 |
| Rich Tapestry Limited | Arts & recreation | 2020 |
| Richmond Electrical (Yorkshire) Limited | Construction | 2026 |
| Riddings Wood Holiday Park Limited | Hospitality | 2019 |
| Ridley Homes Limited | Construction | 2012 |
| Rings of Saturn Limited | Information & communication | 2025 |
| Rinseandrake Services Ltd | Administrative & support | 2024 |
| Ritchiecampers Ltd | Manufacturing | 2025 |
| RJS Farming Ltd | Agriculture & fishing | 2020 |
| RJT Limited | Administrative & support | 2016 |
| RK Joinery Services Limited | Construction | 2025 |
| RLM Properties Ltd | Real estate | 2018 |
| RMH Property Investments Ltd | Real estate | 2019 |
| Rmmez Global Limited | Professional & scientific | 2025 |
| Rmsol Ltd | Construction | 2025 |
| Roam Transport Ltd | Transport & logistics | 2025 |