| RKC Shedfield Trading Ltd | Professional & scientific | 2026 |
| Rkfx Limited | Education | 2025 |
| Rkhem Limited | Wholesale & retail | 2003 |
| RKR Consulting Limited | Professional & scientific | 2007 |
| RKW Shopfitting Limited | Construction | 2015 |
| RLB Services Limited | Other services | 2002 |
| Rlcjp Catering Limited | Other services | 2019 |
| RLH Roofing Ltd | Construction | 2021 |
| RLK Holdings Limited | Other services | 2021 |
| RLM Services (Southampton) Ltd | Administrative & support | 2012 |
| Rlph Limited | Construction | 2020 |
| RLR Cleaning Services Limited | Administrative & support | 2025 |
| RLS Practice Management Services Ltd | Professional & scientific | 2025 |
| RLY Construction Ltd | Construction | 2018 |
| RM Brand & Marketing Ltd | Professional & scientific | 2024 |
| RM Healthcare Services Limited | Health & social care | 2019 |
| RM Legal Solicitors LLP | | 2010 |
| RMA Heritage Ltd. | Professional & scientific | 2010 |
| RMB Enterprise Sales Limited | Professional & scientific | 2017 |
| RME Projects Ltd | Construction | 2023 |
| RME Property Ltd | Real estate | 2021 |
| RMF Property Services Ltd | Construction | 2026 |
| RMG Leasing Limited | Real estate | 2015 |
| RMH (Manor House) Care LLP | | 2007 |
| RMH (Manor House) Property LLP | | 2011 |
| RMH (Wispers) Care LLP | | 2008 |
| Rmhplastering Ltd | Construction | 2012 |
| RMI Enterprise Ltd | Wholesale & retail | 2025 |
| RMJ Geo-Engineering Services Limited | Construction | 2025 |
| RMK Fleet Consultancy Ltd | Administrative & support | 2023 |
| RMM Property Services Ltd | Real estate | 2026 |
| RNB Management (Southampton) Limited | Financial services | 2016 |
| RND Global Ltd | Administrative & support | 2017 |
| Rnie Group Limited | Financial services | 2020 |
| Rnie Investments Limited | Financial services | 2020 |
| Rnie Properties Limited | Financial services | 2020 |
| RNT Construction Services Limited | Construction | 2016 |
| RO Euro Brick Ltd | Construction | 2019 |
| RO Rail Ltd | Professional & scientific | 2016 |
| RO Rocket Carpentry Limited | Construction | 2020 |
| Road Master One Ltd | Wholesale & retail | 2025 |
| Roadrunner Courier Ltd | Transport & logistics | 2025 |
| Roar Entertainment Limited | Arts & recreation | 2017 |
| Roast & Nibble Ltd | Hospitality | 2026 |
| Roast OUT Catering Limited | Hospitality | 2015 |
| Roath & Roath Limited | Real estate | 2019 |
| Roath Consultancy Limited | Professional & scientific | 2014 |
| Roath Electrical Ltd | Construction | 2021 |
| Roath Holdings Limited | Extraterritorial | 2020 |
| Roath Maintenance Ltd | Households | 2022 |
| Roath Management Limited | Real estate | 2022 |
| Roath Products Ltd | Wholesale & retail | 2025 |
| ROB & Denise Elliott Ltd. | Hospitality | 2013 |
| ROB Nicholls (Civil Engineering) Limited | Professional & scientific | 2016 |
| ROB Owton Retail Limited | Manufacturing | 2016 |
| Robert Eddy Ltd | Professional & scientific | 2017 |
| Robert LE Marechal Ltd | Construction | 2021 |
| Robert Nevin Antiques Limited | Wholesale & retail | 2007 |
| Robert Prowting Project Services Limited | Construction | 2012 |
| Robert Smith Landscape and Gardening Maintenance Limited | Administrative & support | 2008 |
| Robert T Sperring Limited | Administrative & support | 1986 |
| Robertos Foods Ltd | Hospitality | 2026 |
| Roberts and Jones Mechanical Services Limited | Construction | 2018 |
| Roberts Bowden LLP | | 2010 |
| Roberts Consulting Limited | Information & communication | 2005 |
| Roberts Developments (Southampton) Limited | Real estate | 2025 |
| Roberts Metal Roofing Ltd | Construction | 2015 |
| Roberts Property Consultancy Limited | Professional & scientific | 2020 |
| Roberts Property Lettings Limited | Real estate | 2022 |
| Robertson Etos Ltd | Administrative & support | 2017 |
| Robertsons (Fareham) Limited | Real estate | 2022 |
| Robertsons Block Management Ltd | Real estate | 2017 |
| Robertsons Property Solutions Limited | Real estate | 2013 |
| Robian Homes Limited | Construction | 2017 |
| Robin Austin Property Surveyors LLP | | 2024 |
| Robin Austin Surveyors Limited | Professional & scientific | 2002 |
| Robin Court Management Limited | Households | 1983 |
| Robins Nest at 129 Ltd | Wholesale & retail | 2019 |
| Robins Nest Childcare Ltd | Education | 2022 |
| Robins Nest Emporium Limited | Wholesale & retail | 2017 |
| Robinson Holdings 2020 Limited | Professional & scientific | 2020 |
| Robinson Reade Limited | Real estate | 2004 |
| Robinsons Automation Machinery Limited | Manufacturing | 2021 |
| Robinworldwide (U.K.) Ltd | Information & communication | 2024 |
| Robkor Ltd | Construction | 2016 |
| Robosys Automation Ltd | Transport & logistics | 2019 |
| Robsolexpress Ltd | Transport & logistics | 2009 |
| Robust Clothing Ltd | Wholesale & retail | 2026 |
| Robust Packaging Ltd | Wholesale & retail | 2024 |
| Rob’S Plumbing Services Ltd | Construction | 2025 |
| Roccia Machinery Limited | Wholesale & retail | 2009 |
| Rock and River Adventures Ltd | Hospitality | 2023 |
| Rock Box Toys Ltd | Wholesale & retail | 2020 |
| Rock Routes Limited | Arts & recreation | 2016 |
| Rock Solid Talent Entertainment Limited | Information & communication | 2014 |
| Rock Valley Trading Limited | Arts & recreation | 2025 |
| Rockbottom Sales Direct Ltd | Wholesale & retail | 2007 |
| Rocke Limited | Hospitality | 2025 |
| Rocket Ronnie's Ltd | Arts & recreation | 2018 |
| Rockhammer Holdco Limited | Financial services | 2020 |