| Rhiwbina Services Ltd | Construction | 2025 |
| Rhiwlas Energy Park Limited | Energy | 2020 |
| Rhizome Connects Ltd | Professional & scientific | 2025 |
| Rhodethorn Limited | Construction | 1987 |
| Rhodri Davies Limited | Health & social care | 2010 |
| Rhombus Resources Ltd | Administrative & support | 2020 |
| Rhomco Consulting Ltd | Construction | 2007 |
| Rhomco Property Management Ltd | Real estate | 2011 |
| Rhondda Drives & Patios Ltd | Construction | 2025 |
| Rhondda Leisure Adventures CIC | Education | 2022 |
| Rhondda Merthyr Limited | Real estate | 2023 |
| Rhondda Recoveries Ltd | Manufacturing | 2022 |
| Rhos Y Cribed LLP | | 2013 |
| Rhosclawdd Ltd | Real estate | 2024 |
| Rhostio Coffee Cardiff Ltd | Hospitality | 2026 |
| Rhotech Ltd | Manufacturing | 2015 |
| RHP Bathroom Services Limited | Construction | 2014 |
| RHS Commerece Ltd | Wholesale & retail | 2020 |
| Rht-Co Global Ltd | Wholesale & retail | 2025 |
| Rhun CYF. | Information & communication | 2024 |
| Rhyd Consult Ltd | Professional & scientific | 2019 |
| Rhyden Scar Ltd | Wholesale & retail | 2026 |
| Rhydian John Limited | Information & communication | 2012 |
| Rhydlafar Properties Ltd | Real estate | 2023 |
| Rhymney Brewery (Cardiff) Limited | Hospitality | 2012 |
| Rhymney Court Ltd | Administrative & support | 2016 |
| Rhyno Ltd | Construction | 2017 |
| Rhys Andrews Carpentry Ltd | Manufacturing | 2019 |
| Rhys David Carpentry Ltd | Manufacturing | 2021 |
| Rhys Enoch Golf Limited | Arts & recreation | 2023 |
| Rhys Gosling Plumbing & Heating Ltd | Construction | 2015 |
| Rhys Harris Construction Ltd | Construction | 2025 |
| Rhys Ifan Ltd | Information & communication | 2014 |
| Rhys Morg Ltd | Administrative & support | 2019 |
| Rhys Padarn Limited | Information & communication | 2019 |
| Rhys Welsh Ltd | Professional & scientific | 2012 |
| Rhys-Pennant CYF | Health & social care | 2019 |
| Rhythm & Reason Consulting Ltd | Professional & scientific | 2024 |
| Rhythm and Muse Music Library LLP | | 2007 |
| Rhythm and Muse Publishing LLP | | 2006 |
| Rhythm and Muse Records LLP | | 2007 |
| Rhythmus Cordis Ltd | Health & social care | 2019 |
| RI & Co Holdings Limited | Financial services | 2022 |
| RI Communications Ltd | Wholesale & retail | 2019 |
| RI Eateries Ltd | Hospitality | 2025 |
| Rialuce Ltd | Manufacturing | 2018 |
| Riana Group Ltd | Wholesale & retail | 2022 |
| Riande Test Limited | Administrative & support | 2012 |
| Ribbon of Life Ltd | Professional & scientific | 2022 |
| Ribeiro Accountancy Limited | Professional & scientific | 2016 |
| Ribh Ltd | Information & communication | 2025 |
| RIC Motors Ltd | Wholesale & retail | 2017 |
| Rice Wheat Aroma Ltd | Hospitality | 2023 |
| Rich Prop Group Limited | Real estate | 2026 |
| Richard Alsept Limited | Professional & scientific | 2004 |
| Richard Andrew Home and Landscapes Ltd | Construction | 2018 |
| Richard Anthony Hair & Beauty Ltd | Other services | 2016 |
| Richard Coles Properties Ltd | Real estate | 2024 |
| Richard Crossland Ltd | Health & social care | 2021 |
| Richard Dunston (Hessle) Limited | Energy | 1931 |
| Richard H.Powell and Partners Limited | Construction | 1972 |
| Richard Healey Finance Ltd | Financial services | 2017 |
| Richard House Management Company Limited | Households | 2006 |
| Richard Jones Builders Limited | Construction | 2004 |
| Richard Kemble Contracts Holdings Ltd | Financial services | 2020 |
| Richard Kemble Contracts Limited | Construction | 2014 |
| Richard King Estate Agents Limited | Real estate | 2025 |
| Richard Language College Limited | Education | 1981 |
| Richard Llynfi Limited | Manufacturing | 2003 |
| Richard Morgan & Company Limited | Real estate | 1980 |
| Richard Newton Consulting Ltd | Professional & scientific | 2011 |
| Richard Parfitt Associates Limited | Extraterritorial | 2016 |
| Richard Parish Limited | Health & social care | 2004 |
| Richard Sutton Limited | Construction | 2010 |
| Richardom Limited | Wholesale & retail | 2025 |
| Richards & Aspin Limited | Real estate | 2026 |
| Richards Architectural Design Ltd | Professional & scientific | 2020 |
| Richards Bros (Wire Wheels) Limited | Manufacturing | 2003 |
| Richards Developments Ltd | Real estate | 2023 |
| Richards LE Services Limited | Construction | 2019 |
| Richards One Ltd | Real estate | 2021 |
| Richards Training Services Limited | Administrative & support | 2012 |
| Richardson Analysis Limited | Information & communication | 2020 |
| Richfield Global Limited | Information & communication | 2023 |
| Richie Nolan Limited | Information & communication | 2015 |
| Richie Turner Associates Limited | Professional & scientific | 2022 |
| Richify Trading Limited | Financial services | 2025 |
| Richkins Ltd | Manufacturing | 2020 |
| Richmond Bagel Limited | Hospitality | 2012 |
| Richmond Court (Cardiff) Residents Association Limited | Households | 1981 |
| Richmond Heights (Bristol) Management Limited | Real estate | 1998 |
| Richmond Properties (Manchester) Limited | Administrative & support | 2015 |
| Richmond Twin Collection Ltd | Real estate | 2025 |
| Richspring Limited | Wholesale & retail | 2025 |
| Ricide Limited | Real estate | 1994 |
| Rickie S Barton Limited | Manufacturing | 2018 |
| Rickndyl Limited | Wholesale & retail | 2025 |
| Ricochet Effect Ltd | Wholesale & retail | 2022 |
| Ride Innerleithen Limited | Wholesale & retail | 2021 |
| Ride on Timee Limited | Wholesale & retail | 2020 |