| Remarkable Solutions Limited | Information & communication | 2025 |
| Reme Luxury Goods Ltd | Wholesale & retail | 2022 |
| Remiam Limited | Information & communication | 2017 |
| Remm Limited | Professional & scientific | 2011 |
| Rems Ventures Limited | Professional & scientific | 2021 |
| Renew Well Being Winchester | Hospitality | 2025 |
| Renovagas Ltd | Construction | 2019 |
| Renovation HB Ltd | Construction | 2024 |
| Renplicity Ltd | Construction | 2026 |
| Repulink Ltd | Wholesale & retail | 2009 |
| Reseau Consulting Limited | Professional & scientific | 2024 |
| Residence Architects Limited | Professional & scientific | 2023 |
| Residential and Commercial Properties Limited | Construction | 1960 |
| Residential Logbook Ltd | Information & communication | 2025 |
| Resonance Body Art Ltd | Wholesale & retail | 2022 |
| Resource Recruitment Limited | Extraterritorial | 2000 |
| Resourceful Marketing Ltd | Administrative & support | 2013 |
| Responsible Owner Ltd | Wholesale & retail | 2026 |
| Responsible Reptile Keeping Limited | Information & communication | 2023 |
| Restless Stories Ltd | Information & communication | 2026 |
| Results Catalysts Ltd | Administrative & support | 2003 |
| Retuned Media Ltd | Information & communication | 2020 |
| Reuben James Consulting Ltd | Wholesale & retail | 2026 |
| Revenews Consultants Limited | Professional & scientific | 2023 |
| Revie Management Limited | Administrative & support | 2020 |
| REX Daniel Ltd | Wholesale & retail | 2022 |
| RG Forrest Limited | Administrative & support | 2011 |
| Rginsights Limited | Professional & scientific | 2025 |
| RH Orthopaedics Limited | Health & social care | 2024 |
| RHB Partnership (North) Ltd | Professional & scientific | 2025 |
| Rhla Ltd | Administrative & support | 2016 |
| Rhodius Partners Ltd | Financial services | 2005 |
| Ribbesford Home Care Winchester Limited | Health & social care | 2023 |
| Richard Bore Consulting Limited | Professional & scientific | 2019 |
| Richard Edwards Limited | Information & communication | 2006 |
| Richard Steel & Partners Limited | Other services | 2003 |
| Richard Tyndall Limited | Administrative & support | 2006 |
| Richard White Consultancy Services Ltd | Education | 2023 |
| Richard Worrall Limited | Professional & scientific | 2010 |
| Richmond Woodhouse Limited | Agriculture & fishing | 2012 |
| Rick Munro Mediation Limited | Professional & scientific | 2023 |
| Ridewinchester Ltd | Transport & logistics | 2024 |
| Ridgeland Landscapes Ltd | Administrative & support | 2025 |
| RIG Electrics Limited | Construction | 2002 |
| Rigana UK Limited | Manufacturing | 2020 |
| Right Land Profits Ltd | Real estate | 2024 |
| Right Result: Right Way Ltd | Professional & scientific | 2010 |
| Rightcruit Ltd | Administrative & support | 2020 |
| Rinder Limited | Agriculture & fishing | 2003 |
| Ringbourne Copse Management Company Limited | Real estate | 2015 |
| Ripple Consulting Ltd | Information & communication | 2023 |
| Rishi Chau Limited | Real estate | 2025 |
| Riskcovered Limited | Professional & scientific | 2001 |
| River RAT Limited | Information & communication | 2007 |
| Rivers Engineering Company (Winchester) Limited | Manufacturing | 1951 |
| Riviera Real Estate Limited | Real estate | 2023 |
| RJ Gallagher Investments Ltd | Real estate | 2021 |
| RJB Horticulture Limited | Other services | 2012 |
| RJM Corporation (EC) Limited | Administrative & support | 2000 |
| RJM Corporation Limited | Professional & scientific | 2010 |
| RJM Corporation Technical Services Limited | Professional & scientific | 2016 |
| RJM Europe Limited | Administrative & support | 2026 |
| RJM Land Investments Limited | Agriculture & fishing | 2020 |
| RJM PDS Ltd | Construction | 2022 |
| RJP South Coast Developments Limited | Real estate | 2017 |
| RKF (Andover) Ltd. | Professional & scientific | 2007 |
| RL AI Limited | Information & communication | 2019 |
| RLB Design Consultancy Ltd | Administrative & support | 2007 |
| RLF Academy Limited | Arts & recreation | 2022 |
| RMB 101 Limited | Extraterritorial | 2005 |
| RMB 102 Limited | Real estate | 2011 |
| RMJ Surveys Ltd | Professional & scientific | 2007 |
| RMP Networks Limited | Information & communication | 2024 |
| RNR Traffic Management Services Ltd | Construction | 2022 |
| Road RAT Limited | Information & communication | 2017 |
| Roasting Party Retail Limited | Hospitality | 2025 |
| ROB and Claud Cleaning Limited | Administrative & support | 2026 |
| ROB Whiting Fencing Limited | Construction | 2008 |
| Robden Holdings Limited | Financial services | 2016 |
| Robert Adam Architectural Consultancy Ltd | Construction | 2019 |
| Robert Charles Hutchison Ltd | Professional & scientific | 2021 |
| Robin Creative Media Ltd | Information & communication | 2017 |
| Robin Lewis HR Ltd. | Professional & scientific | 2023 |
| Robot Fish Limited | Arts & recreation | 2014 |
| Robust Performance Ltd | Arts & recreation | 2024 |
| Rochem Fyrewash Ltd | Manufacturing | 1983 |
| Rocinante Investments Ltd | Real estate | 2018 |
| Rock (Hospitality & Retail) Limited | Hospitality | 2021 |
| Rockdale Computing Limited | Information & communication | 1995 |
| Rocket Launch Limited | Professional & scientific | 2014 |
| Rockstar Ltd | Wholesale & retail | 2019 |
| Rockstone Data Ltd | Professional & scientific | 2019 |
| Roebuck Property Solutions Limited | Construction | 2024 |
| Roehampton Court Limited | Real estate | 1987 |
| Rofgo Racing Limited | Professional & scientific | 2014 |
| Rogene Trailer Parts Limited | Transport & logistics | 1982 |
| Roger Bitmead (Cholsey) Limited | Agriculture & fishing | 1972 |
| Romania Live Limited | Administrative & support | 2025 |
| Romet Solutions Limited | Professional & scientific | 2014 |
| Romsey Medical Limited | Health & social care | 2014 |