| Roemer Immobilien Limited | Administrative & support | 2010 |
| Roerich Limited | Financial services | 2016 |
| ROF414L Ltd | Administrative & support | 2026 |
| Rogancorp Ltd | Construction | 2023 |
| Rogenhanyu Trading Ltd | Wholesale & retail | 2021 |
| Roger Cleaning Services Ltd | Administrative & support | 2020 |
| Roger Jackson Associates Limited | Professional & scientific | 2010 |
| Roger Mcpherson Ltd | Health & social care | 2020 |
| Roger Pearce & Associates Ltd | Professional & scientific | 2022 |
| Rogerio Costa Transport Ltd | Transport & logistics | 2013 |
| Rogers & Sons Services Ltd | Construction | 2020 |
| Rogers Joiners Ltd | Construction | 2018 |
| Rogerstan Finance Limited | Financial services | 1962 |
| Rogilded Limited | Professional & scientific | 2024 |
| Roglam Marketplace Limited | Wholesale & retail | 2025 |
| Roglo Group Ltd | Professional & scientific | 2025 |
| Rogue Creative Limited | Arts & recreation | 2018 |
| Rohad&Rehan Ltd | Wholesale & retail | 2025 |
| Roines Estates Limited | Real estate | 1938 |
| Rojal Property Limited | Real estate | 2019 |
| Rojcan Ltd | Wholesale & retail | 2025 |
| Rojj Limited | Construction | 2013 |
| Rojora Ltd | Wholesale & retail | 2026 |
| ROK Financial Investments Ltd | Financial services | 2024 |
| Roka Card Limited | Information & communication | 2026 |
| Roka Developments Ltd | Construction | 2016 |
| Rokh Global Limited | Administrative & support | 2024 |
| Rokhto Forged Customs and Mechanics Ltd | Wholesale & retail | 2025 |
| Roland (Guangzhou) Auto Parts Co., Ltd. | Administrative & support | 2024 |
| Roland Gift Limited | Wholesale & retail | 2021 |
| Rolilha Ltd | Wholesale & retail | 2015 |
| Roll and Grill Ltd | Hospitality | 2025 |
| Roll Express Limited | Hospitality | 2024 |
| Roll Revolution Limited | Hospitality | 2024 |
| Rollas Global Ltd | Wholesale & retail | 2025 |
| Rolling Stock Solutions Ltd. | Construction | 2014 |
| Rollingmotion Auto Electrical Limited | Wholesale & retail | 2013 |
| Rollo’S Doughnuts Ltd | Manufacturing | 2025 |
| Rollr Limited | Transport & logistics | 2019 |
| Rolph’S Body Repairs Ltd | Wholesale & retail | 2025 |
| ROM Group Limited | Manufacturing | 1996 |
| ROM Limited | Manufacturing | 1926 |
| ROM Trans Services Ltd | Transport & logistics | 2017 |
| Romak Group Ltd | Construction | 2019 |
| Roman Lane Management Company Limited | Real estate | 2020 |
| Roman Property Group Ltd | Real estate | 2019 |
| Roman Scaffolding Limited | Construction | 2020 |
| Roman VL Ltd | Transport & logistics | 2021 |
| Romana Capital LLP | | 2012 |
| Romana GP Limited | Financial services | 2018 |
| Romana Nominees Limited | Financial services | 2018 |
| Romanian Builder Ltd | Transport & logistics | 2022 |
| Romanic Ltd | Wholesale & retail | 2022 |
| Romano Retail Limited | Wholesale & retail | 2019 |
| Romar Developments Ltd | Real estate | 2017 |
| Romark Limited | Wholesale & retail | 1987 |
| Romas Properties Ltd | Households | 2024 |
| Romaya Projects Ltd | Construction | 2024 |
| Romboc Limited | Administrative & support | 2024 |
| Rome Barbers Ltd | Other services | 2024 |
| Rome Mini Market Ltd | Wholesale & retail | 2026 |
| ROMEOB2M Clothing Ltd | Wholesale & retail | 2019 |
| Romi Services Limited | Information & communication | 2013 |
| Romibee Ltd | Wholesale & retail | 2025 |
| Romilly Business Services Limited | Administrative & support | 2023 |
| Romilly Life Sciences Ltd | Professional & scientific | 2023 |
| Romilly Management Services Limited | Real estate | 2005 |
| Romilly Road 4D Limited | Households | 2012 |
| Romly Limited | Professional & scientific | 2026 |
| Romman Trading Ltd | Wholesale & retail | 2025 |
| Romod Company Limited | Construction | 2019 |
| Rompney Castle Estate Ltd | Construction | 2020 |
| Romtech Limited | Manufacturing | 1999 |
| Romypets Limited | Wholesale & retail | 2016 |
| Rondata Ltd | Wholesale & retail | 2026 |
| Rondovald Ltd | Real estate | 2026 |
| Rone Watch Company Ltd | Manufacturing | 2025 |
| Roneen (Cardiff) Ltd | Real estate | 2021 |
| Ronie Consultancy Ltd | Health & social care | 2020 |
| Ronmuth Consultants Ltd | Health & social care | 2018 |
| Ronson Seaborn Limited | Transport & logistics | 2021 |
| Ronyadent Ltd | Health & social care | 2026 |
| Roocroft (Plant Hire) Limited | | 1973 |
| Roof 2 Roofs Specialist Ltd | Construction | 2026 |
| Roof Force Property Solutions Ltd | Construction | 2025 |
| Roof Rider Ltd | Wholesale & retail | 2023 |
| Roof Right Roofing Ltd | Construction | 2024 |
| Roof Surge Group Ltd | Construction | 2025 |
| Roof Survey UK Ltd | Construction | 2023 |
| Roofa Ltd | Professional & scientific | 2023 |
| Roofbond Roof Restoration Ltd. | Construction | 1991 |
| Roofcare Roofing Ltd | Construction | 2025 |
| Roofco UK Building Contractors Ltd | Construction | 2026 |
| Roofguard Protection Ltd | Construction | 2025 |
| Roofing & Damp Proofing Ltd | Construction | 2023 |
| Roofing Master PVT Ltd | Construction | 2025 |
| Roofing Pro Manchester Ltd | Construction | 2025 |
| Roofshieldroofs Ltd | Construction | 2025 |
| Rooftech Cardiff Ltd | Construction | 2021 |
| Rookron Limited | Wholesale & retail | 2025 |