| Rockhopper Racing Limited | Professional & scientific | 2025 |
| Rockin Robin Gifts Ltd | Manufacturing | 2025 |
| Rockrise Estates Limited | Real estate | 2025 |
| Rocksalt Ltd | Professional & scientific | 1999 |
| Rocksolid Contractors Ltd | Construction | 2025 |
| Rockstone Communications Limited | Professional & scientific | 2018 |
| Rockstone Recruitment Ltd | Administrative & support | 2016 |
| Rockwood and Sons Ltd | Wholesale & retail | 2025 |
| Rockwood Roofing & Building Ltd | Construction | 2025 |
| ROD Jolley Coachbuilding Limited | Real estate | 1984 |
| Roda Consulting & Management Services Ltd | Professional & scientific | 2024 |
| Roda Polo Limited | Wholesale & retail | 2023 |
| Roddington Forge Leisure Storage Limited | Real estate | 2011 |
| Roddington Forge Limited | Transport & logistics | 2006 |
| Roddington Forge Motorhome Storage Limited | Transport & logistics | 2015 |
| Rodina Investments Ltd | Hospitality | 2012 |
| Rodina Property Lettings and Management Ltd | Hospitality | 2021 |
| Rodose Company Ltd | Financial services | 2023 |
| Rodriguez PUB Co Ltd | Hospitality | 2024 |
| Roger Fast Deliveries Ltd | Transport & logistics | 2026 |
| Roger Smallman & Co Limited | Professional & scientific | 1999 |
| Roger the Window MAN Limited | Construction | 2014 |
| Rogers Company Holdings Ltd | Financial services | 2025 |
| Rogers Demolition & Salvage Ltd | Construction | 2012 |
| Rogers Design Consultancy Ltd | Professional & scientific | 2019 |
| Rogers Sailing Consultancy Ltd | Arts & recreation | 2024 |
| Rogers Scientific Limited | Manufacturing | 2022 |
| Rohify Ltd | Wholesale & retail | 2024 |
| Rohk Property Limited | Real estate | 2024 |
| Rohk Southern Limited | Construction | 2018 |
| Roji Consulting Limited | Professional & scientific | 2022 |
| Rojiro Ltd | Wholesale & retail | 1998 |
| Rokk Building & Groundwork Contractors Ltd | Construction | 2025 |
| Roland Security (Andover) Limited | Administrative & support | 2012 |
| Roll-Out Carpets and Beds Ltd | Wholesale & retail | 2026 |
| Roller Collective CIC | Other services | 2026 |
| Roller Shutter Bits Ltd | Manufacturing | 2019 |
| Rolleston Property Management Limited | Households | 2006 |
| Rollestone Instrument Engineering Limited | Professional & scientific | 2007 |
| Rolls & Bowls Ltd | Wholesale & retail | 2023 |
| Rollsy's Retro Ltd | Wholesale & retail | 2024 |
| ROM Property Holdings Limited | Real estate | 2016 |
| ROM Property Lettings Limited | Real estate | 2020 |
| Roman Drylining Ltd | Construction | 2014 |
| Roman Kolcz Transport Ltd | Transport & logistics | 2013 |
| Roman Land Lords Ltd | Real estate | 2022 |
| Romanian Cultural Association -South Coast C.I.C. | Education | 2025 |
| Romanian Flavours Ltd | Hospitality | 2025 |
| Romano Deli Limited | Hospitality | 2018 |
| Romans Exterior Cleaning Services Ltd | Administrative & support | 2024 |
| Romant Construction Limited | Administrative & support | 2016 |
| Romax Engineering Limited | Professional & scientific | 2023 |
| Rome Fashion Ltd | Extraterritorial | 2024 |
| Romeo Cabs Ltd | Transport & logistics | 2024 |
| Romeo Construct Ltd | Construction | 2026 |
| Romeo Pizza South Ltd | Hospitality | 2025 |
| Romeva Engineering Services Limited | Professional & scientific | 2023 |
| Romick Services Ltd | Construction | 2015 |
| Romishk Limited | Real estate | 2019 |
| Romkim Limited | Transport & logistics | 2015 |
| Romsey Builders Limited | Construction | 1997 |
| Romsey Court Management Company Limited | Households | 1986 |
| Romsey Estates Limited | Construction | 2021 |
| Romsey Leasure Limited | Hospitality | 2026 |
| Romsey Limited | Real estate | 1980 |
| Romsey Road (Winchester) Limited | Households | 2021 |
| Romsey Services Ltd | Professional & scientific | 2026 |
| Romsey SO16 Management Limited | Professional & scientific | 2017 |
| Romsey Steelwork & Cladding Limited | Construction | 1986 |
| Romsey Vehicle Bodyshop Limited | Wholesale & retail | 2025 |
| RON A-G Ltd | Transport & logistics | 2020 |
| RON Lines Limited | Wholesale & retail | 2019 |
| RON Meldrum Ltd | Real estate | 2010 |
| Ron-Berks Acoustic Limited | Professional & scientific | 2022 |
| Ronald Travel Management Limited | Administrative & support | 2019 |
| Rong Forest Limited | Hospitality | 2025 |
| Ronniehub Ltd | Information & communication | 2026 |
| Ronnix Limited | Information & communication | 2003 |
| Rooben's Catering Ltd | Hospitality | 2025 |
| Roof Surveying Services Ltd | Extraterritorial | 2025 |
| Roofcentre Ltd | Construction | 2023 |
| Roofing & Property Maintenance Limited | Construction | 1999 |
| Roofing Cladding & Building Limited | Construction | 1994 |
| Roofing Cladding & Felting Services Limited | Construction | 2009 |
| Roofing Contracts & Building Limited | Construction | 2003 |
| Roofing Kits Direct Limited | Wholesale & retail | 2018 |
| Roofing Systems Limited | Construction | 2026 |
| Room 8 Hair and Beauty Limited | Other services | 2016 |
| Room 8 Salon Group Limited | Financial services | 2025 |
| ROOM8 Sarisbury Green Ltd | Other services | 2026 |
| Rooster Buzz Limited | Extraterritorial | 2019 |
| Rooster Digital Limited | Information & communication | 2009 |
| Rooster Marketing Limited | Professional & scientific | 2014 |
| Rooster Piri Piri Ltd | Hospitality | 2020 |
| Roosters High Street Ltd | Hospitality | 2019 |
| Roosters Lounge Limited | Hospitality | 2025 |
| Roosts Holdings Limited | Financial services | 2018 |
| Root Clause Limited | Professional & scientific | 2014 |
| Root System Limited | Manufacturing | 2025 |
| Rope Walk Hamble Limited | Arts & recreation | 2003 |