| RAE Global Marketing Limited | Professional & scientific | 2024 |
| Raeso Holdings Ltd | Financial services | 2018 |
| Ragnarok Events Ltd | Hospitality | 2024 |
| RAI Resell Limited | Wholesale & retail | 2023 |
| Rail Network Limited | Professional & scientific | 2008 |
| Rail Safety Limited | Professional & scientific | 2002 |
| Railway Inn (Winchester) Ltd | Hospitality | 2014 |
| Rainbird Systems Services Limited | Information & communication | 2012 |
| Rainbow Interchange Limited | Information & communication | 2013 |
| RAM Investement Ltd | Real estate | 2025 |
| RAM Technologies Limited | Information & communication | 2025 |
| Ramkaj UK Ltd | Real estate | 2021 |
| Ramura Barber Limited | Other services | 2019 |
| Ranelagh Property Limited | Real estate | 2021 |
| Range Fashion Limited | Other services | 2019 |
| Rangers Agricultural Limited | Administrative & support | 2010 |
| Rangers Commercial Services Limited | Manufacturing | 2008 |
| Rangers Farm & Properties Ltd | Real estate | 2002 |
| Rangers Hampshire Ltd | Administrative & support | 2011 |
| Rangers Roofing Ltd | Construction | 2026 |
| Raphaela Dyer Nutrition Ltd | Health & social care | 2021 |
| Rapid Test Digital Limited | Professional & scientific | 2020 |
| Rapport in Winchester Limited | Other services | 1998 |
| Raptor Properties Limited | Wholesale & retail | 1986 |
| Rare Digital Limited | Information & communication | 2016 |
| Rassam Innovations Ltd | Professional & scientific | 2015 |
| Ratestack Reviews Limited | Information & communication | 2025 |
| Ratim Ltd | Transport & logistics | 2022 |
| Ratlake Farm (Leisure) Limited | Construction | 1984 |
| Ratlake Solutions Ltd | Professional & scientific | 2008 |
| Raven Enterprises Limited | Administrative & support | 2005 |
| Ravens Court Finance Ltd. | Professional & scientific | 2017 |
| Ravensford Health Limited | Administrative & support | 2011 |
| Ravenswood Properties Limited | Construction | 2010 |
| RAW Bean Limited | Wholesale & retail | 2012 |
| Rawding Partners Limited | Agriculture & fishing | 2011 |
| Rawles Motorsport Limited | Wholesale & retail | 1998 |
| Rawlings Professionals Limited | Other services | 2006 |
| Rawside Limited | Professional & scientific | 2016 |
| RAY Jordan & Company Limited | Information & communication | 2014 |
| Raylive Limited | Professional & scientific | 1989 |
| Raymonds Roofing Ltd | Construction | 2022 |
| RB House Group Ltd | Hospitality | 2026 |
| RBL Education Limited | Education | 2020 |
| RBM Global Ltd | Other services | 2022 |
| RBS Scaffolding Asset Company Limited | Administrative & support | 2016 |
| RBS Scaffolding Limited | Construction | 1999 |
| RDB Green Limited | Construction | 2012 |
| RDC2 Ltd | Professional & scientific | 2023 |
| RDL Scientific Limited | Administrative & support | 1996 |
| Re:Dress Winchester Limited | Wholesale & retail | 2011 |
| Re:Impact Mosaic Limited | Other services | 2023 |
| Reach Cricket Management Ltd | Arts & recreation | 2022 |
| Reach Home Improvements Ltd | Construction | 2021 |
| REACT24 (Southern) Limited | Wholesale & retail | 2018 |
| Readysupp Limited | Manufacturing | 2013 |
| Real Escape Investments Ltd | Real estate | 2019 |
| Rebecca Lester Limited | Professional & scientific | 2021 |
| Rebos Trading Limited | Wholesale & retail | 2022 |
| Record Cleaning Box Ltd | Manufacturing | 2023 |
| Rectory Gardens Management Limited | Households | 2007 |
| Rectory Pump Limited | Households | 1996 |
| Red Ensign Properties Limited | Real estate | 2013 |
| Red Ensign Property Management Limited | Real estate | 2016 |
| Red Kite Collective Limited | Real estate | 2026 |
| Red Kite Property Holdings Limited | Real estate | 2022 |
| Red Labels Ltd | Wholesale & retail | 2017 |
| Red Lion Farm Limited | Agriculture & fishing | 1992 |
| Red Penguin Ventures Ltd | Professional & scientific | 2021 |
| Red Sky Partners Limited | Professional & scientific | 2018 |
| Red Sky Roofing Ltd | Construction | 2024 |
| Red Top Resources Limited | Administrative & support | 2002 |
| Red Tulip Solutions Ltd | Professional & scientific | 2017 |
| Red Tunic Ltd | Professional & scientific | 2025 |
| Red White & CRU Limited | Extraterritorial | 2008 |
| Redbox Solutions UK Ltd | Information & communication | 2005 |
| Redburn Mechanical Services Ltd | Construction | 2012 |
| Redhill Media Limited | Information & communication | 2015 |
| Redthorne Developments Ltd | Professional & scientific | 2017 |
| Reeb Holdings Limited | Hospitality | 2017 |
| Reece Residences Ltd | Construction | 2022 |
| Reef Technologies UK Limited | Information & communication | 2011 |
| Rees Estates Limited | Real estate | 2025 |
| Refined Design and Construction Ltd | Construction | 2026 |
| Refined Developments Ltd | Other services | 2018 |
| Regen:Biologics Ltd | Manufacturing | 2024 |
| Regency House (Freehold) Limited | Households | 2019 |
| Regencydances.Org | Arts & recreation | 2014 |
| Regeneration Services Limited | Agriculture & fishing | 2004 |
| Regime Barbers Limited | Other services | 2017 |
| Regis Property Management Ltd | Households | 2006 |
| Regni Dining Limited | Hospitality | 2025 |
| Regnum Court Residents' Association Limited | Households | 1999 |
| Rejen Classics Ltd | Wholesale & retail | 2020 |
| Rejuvime Aesthetics Ltd | Health & social care | 2023 |
| Rekan Limited | Administrative & support | 2011 |
| Relish Productions Limited | Information & communication | 2019 |
| Rellik Films Limited | Arts & recreation | 2019 |
| Reluxe Limited | Construction | 2016 |
| Reluxury Limited | Wholesale & retail | 2026 |