| R&S Collective Ltd | Other services | 2026 |
| R. Bryan (Tyneside) Limited | Other services | 2013 |
| R. Mead Phase 1 (Swindon) Management Company Limited | Households | 2005 |
| R.J. & N.J. Clarke Limited | Agriculture & fishing | 2003 |
| R.J. Pearce Plumbing & Heating Limited | Construction | 2003 |
| R.S Bricklaying Ltd | Construction | 2017 |
| R.S.W. Medico-Legal Limited | Professional & scientific | 2001 |
| R.W.R. Property Maintenance Limited | Construction | 1985 |
| R7 Consultants Limited | Information & communication | 2018 |
| R7 Properties Limited | Real estate | 2023 |
| RA Computers Limited | Information & communication | 2006 |
| RA FFF Coaching LLP | | 2026 |
| Raagya Consulting Ltd | Information & communication | 2026 |
| Raahavy Limited | Information & communication | 2025 |
| Raas Limited | Hospitality | 2014 |
| RAB Courier Ltd | Transport & logistics | 2025 |
| Rabia Swindon Ltd | Hospitality | 2026 |
| Rachamin Health Care Ltd | Health & social care | 2025 |
| Rachana Bhatta Ltd | Health & social care | 2020 |
| Rachel BA Consulting Ltd | Professional & scientific | 2023 |
| Rackham Electrical Ltd | Construction | 2023 |
| Racoo Screening Ltd | Professional & scientific | 2019 |
| Radad Ltd | Professional & scientific | 2020 |
| Radar Commercial Ltd | Construction | 2019 |
| Radiant Aesthetics Clinic Ltd | Public administration | 2024 |
| Radio Taxis (Swindon) Limited | Transport & logistics | 1966 |
| Radnor Estates Limited | Construction | 2015 |
| Radsafe CLG | Water & waste | 2008 |
| Radsafe Limited | Water & waste | 2026 |
| Radu Logistics Ltd | Transport & logistics | 2024 |
| Raduc Limited | Transport & logistics | 2018 |
| RAE Maries Wellbeing Therapies Ltd | Other services | 2023 |
| Raegas Ltd | Other services | 2011 |
| Raez Body Limited | Wholesale & retail | 2024 |
| RAF Logistics Ltd | Transport & logistics | 2019 |
| RAF Trans Care Ltd | Transport & logistics | 2019 |
| Ragin Cajun Limited | Hospitality | 2019 |
| Ragnar Investments Limited | Financial services | 2024 |
| Ragu SFK Ltd | Manufacturing | 2022 |
| Raheel Travels and Tours Ltd | Administrative & support | 2018 |
| Railquest International Travel &Education Ltd | Administrative & support | 2025 |
| Railston Holdings Limited | Professional & scientific | 2005 |
| Railway Village Convenience Shop Ltd | Wholesale & retail | 2023 |
| Railwise Engineering Ltd | Professional & scientific | 2020 |
| Rainbow Entertainment & Prom Ltd | Information & communication | 2018 |
| Rainbowsend Band UK Ltd | Information & communication | 2025 |
| Rais Optometry Ltd | Health & social care | 2024 |
| Raise the Reef Ltd | Wholesale & retail | 2025 |
| Raise the Reef Retail Ltd | Wholesale & retail | 2026 |
| RAJ Swindon Restaurant Ltd | Hospitality | 2020 |
| Raja Fawad Technology Services Limited | Information & communication | 2024 |
| Rako UK Ltd | Real estate | 2019 |
| Raleigh House RTM Company Ltd | Households | 2017 |
| RAM Fuels Limited | Wholesale & retail | 2024 |
| Ramal Ltd | Wholesale & retail | 2019 |
| Ramla Limited | Information & communication | 2010 |
| Ramleaze Court (Lydiard) Management Company Limited | Households | 1989 |
| Ramleaze Swindon Limited | Hospitality | 2018 |
| Ramo's Kebab Limited | Wholesale & retail | 2022 |
| Ramona Catering Ltd | Wholesale & retail | 2017 |
| Rampion Extension Development Limited | Construction | 2019 |
| Rampion Offshore Wind Limited | Energy | 2010 |
| Rampo Carpentry Ltd | Construction | 2023 |
| Ramsbury Building Services Ltd | Construction | 2012 |
| Ramzan Business Services Limited | Wholesale & retail | 2017 |
| RAN Communications Limited | Information & communication | 2006 |
| RAN Experts Ltd | Professional & scientific | 2012 |
| RAN Projects PM Ltd | Information & communication | 2020 |
| Randek UK Ltd | Professional & scientific | 2019 |
| Random Spark Ltd | Information & communication | 2024 |
| Raneti Care Ltd | Wholesale & retail | 2018 |
| Rang Threads Ltd | Wholesale & retail | 2024 |
| Rangel Limited | Construction | 2026 |
| Ranng Investment Services Limited | Financial services | 2025 |
| Ranng Property Services Ltd | Real estate | 2024 |
| Ranng Services Limited | Information & communication | 2015 |
| RAP Construction Limited | Construction | 2017 |
| Rapid Emergency Plumbing Limited | Construction | 2025 |
| Rapid Impact Engineering Ltd | Manufacturing | 2024 |
| Rapid Shift Limited | Wholesale & retail | 2024 |
| Rapido Television Limited | Information & communication | 2003 |
| RAPROP8 Ltd | Real estate | 2024 |
| Rarry Ltd | Wholesale & retail | 2020 |
| Rasifo Services Ltd | Transport & logistics | 2023 |
| Rasu Pharma Ltd | Wholesale & retail | 2025 |
| Rath Properties Limited | Real estate | 2023 |
| Rathmore Property Holdings Ltd | Real estate | 2026 |
| Raven Athletics Ltd | Wholesale & retail | 2021 |
| Raven Scaffolding Ltd | Construction | 2023 |
| Raven.Gg Limited | Professional & scientific | 2013 |
| Raviraj Properties Ltd | Real estate | 2018 |
| RAW4PAWZ Limited | Wholesale & retail | 2020 |
| Rayan's Lettings Ltd | Real estate | 2024 |
| Raylam Construction Limited | Construction | 2017 |
| Rays Ice Cream Ltd | Manufacturing | 2025 |
| Raza Foods Limited | Hospitality | 2025 |
| Razor Television Limited | Information & communication | 1997 |
| Razu Properties Ltd | Real estate | 2025 |
| Razzor Limited | Transport & logistics | 2023 |
| Rb&Gl Logistic Ltd | Transport & logistics | 2020 |