| RNG Services Limited | Professional & scientific | 2020 |
| Roam FAR Ltd | Information & communication | 2026 |
| Robbins & Sons (Holdings) Ltd | Financial services | 2020 |
| Robbins & Sons (HR) Ltd | Administrative & support | 2020 |
| Roben Property Developments Ltd | Construction | 2026 |
| Robert Beale Limited | Administrative & support | 2010 |
| Robert Bowen Planning and Development Ltd | Professional & scientific | 2014 |
| Robert Bowen Site Service Ltd. | Construction | 2006 |
| Robert Fisher Limited | Professional & scientific | 2003 |
| Robert Morgan & Sons Limited | Agriculture & fishing | 1953 |
| Robert Thomas Painters & Decorators Ltd | Construction | 2002 |
| Roberts & Ball Limited | Professional & scientific | 2003 |
| Roberts and Williamson Associates Ltd | Professional & scientific | 2019 |
| Roberts Family Holding Company Ltd | Real estate | 2022 |
| Roberts Homes Estate Agents Limited | Real estate | 2021 |
| Roberts Repairs Limited | Wholesale & retail | 2025 |
| Robertson Languages International Limited | Professional & scientific | 1996 |
| Robex Consulting Ltd | Professional & scientific | 2023 |
| Robinson's Lighting & Electrical Services Limited | Construction | 2023 |
| Roblin Holdings Ltd | Financial services | 2019 |
| Roblin Investments Ltd | Real estate | 2023 |
| Roblins UN Limited | Real estate | 2017 |
| Robo Construction Ltd | Construction | 2019 |
| Rochefreight UK Limited | Transport & logistics | 1953 |
| Rock Eternal Limited | Real estate | 2017 |
| Rock the Dragon Ltd | Manufacturing | 2005 |
| Rockdove Invest Ltd. | Wholesale & retail | 2015 |
| Rocket Jump Technology Ltd | Information & communication | 2015 |
| Rockfield Global Technologies Limited | Financial services | 2014 |
| Rockfield Holdings Limited | Information & communication | 1999 |
| Rockfield Software Limited | Professional & scientific | 1985 |
| Rockstar Hair Studio Ltd | Other services | 2013 |
| Rockview Employment Services Ltd | Administrative & support | 2014 |
| ROE Valley Electrics Ltd | Other services | 2020 |
| Roger Blackmore Autos Limited | Wholesale & retail | 2006 |
| Roger Byers & Co Limited | Professional & scientific | 2014 |
| Roger Castle & Daughter Limited | Other services | 2015 |
| Roger Hopkins Security and Investigations Ltd | Administrative & support | 2023 |
| Roger Roberts (Surveys) Limited | Professional & scientific | 2009 |
| Rogers & Co (Swansea) Limited | Professional & scientific | 2008 |
| Rogers and Russell (Contracting) Limited | Construction | 2020 |
| Rogue Souls Ltd | Wholesale & retail | 2026 |
| Rojbin Food Ltd | Hospitality | 2022 |
| Rokib Uddin Advisory Ltd | Professional & scientific | 2023 |
| Rokoko Limited | Other services | 2010 |
| Roksi Limited | Real estate | 2017 |
| Roll 7 Properties Limited | Real estate | 2022 |
| Rollaclad Limited | Manufacturing | 1990 |
| Rolling Mill Estates Ltd | Real estate | 2025 |
| Roma 2000 Limited | Hospitality | 2013 |
| Roman Market Ltd | Other services | 2024 |
| Romi Chippy Ltd | Hospitality | 2024 |
| Romviet Ltd | Other services | 2006 |
| RON James (Welding Services) Limited | Manufacturing | 2002 |
| Ron's Recovery & Repair Ltd | Wholesale & retail | 2019 |
| Ron's Repair Limited | Wholesale & retail | 2024 |
| Ronan Property Ltd | Real estate | 2024 |
| Ronin Software Limited | Information & communication | 2016 |
| Roobear Consulting Ltd | Professional & scientific | 2021 |
| Roof Craft Bridgend Ltd | Construction | 2021 |
| Roof Renovations Ltd | Construction | 2024 |
| Rooke Rail and Civils Limited | Construction | 2016 |
| Rookrey Foods Limited | Wholesale & retail | 2020 |
| Roomoo Property Ltd | Real estate | 2025 |
| Rooted Fire Fuel Ltd | Wholesale & retail | 2020 |
| Rooted Tree & Landscapes Ltd | Administrative & support | 2013 |
| Rootes Jaguar Limited | Wholesale & retail | 2024 |
| Rootfinance Ltd | Professional & scientific | 2024 |
| Rope & Sling Specialists Limited | Manufacturing | 2000 |
| Rope and Sling Limited | Extraterritorial | 2014 |
| ROS Mortgages Limited | Financial services | 2025 |
| Rosantium Ltd | Wholesale & retail | 2021 |
| Rose & Gordon Limited | Professional & scientific | 2022 |
| Rose and Rebellion Limited | Manufacturing | 2008 |
| Rose Indienne Limited | Hospitality | 2014 |
| Rosehill Community FC CIC | Education | 2025 |
| Rosha Homes Limited | Real estate | 2018 |
| Rosie LEA Bakery Limited | Hospitality | 2011 |
| Ross Car Sales Limited | Wholesale & retail | 2006 |
| Ross Carbery Limited | Professional & scientific | 2001 |
| Ross Moulton Electrical Limited | Construction | 2017 |
| Rossco Surveys Limited | Professional & scientific | 2019 |
| Rosser Developments Limited | Real estate | 2023 |
| Rosser & Sons Ltd | Construction | 2005 |
| Rosser Healthcare Ltd | Health & social care | 2015 |
| Rosser Investments Limited | Financial services | 2023 |
| Rostok Swansea Limited | Health & social care | 2021 |
| Rotafix (Northern) Limited | Manufacturing | 1984 |
| Rotherslade Estate Limited | Hospitality | 1961 |
| Rotherslade Shellfish Limited | Agriculture & fishing | 2011 |
| Rothley Lodge Management Company Limited | Real estate | 2004 |
| Roudh Enterprise Ltd | Hospitality | 2019 |
| Roudh Niwas Properties Ltd | Real estate | 2023 |
| Rough Riders Ltd | Hospitality | 2022 |
| Roundhouse Maintenance Limited | Administrative & support | 2010 |
| Rovin Holdings Ltd | Real estate | 2020 |
| Rovin Lettings Ltd | Real estate | 2021 |
| Rowberry Bridal Limited | Wholesale & retail | 2023 |
| Rowberry's Footwear Limited | Wholesale & retail | 1971 |
| Rowecord Total Access Limited | Construction | 1986 |