| R Carson Consulting Limited | Wholesale & retail | 2019 |
| R Contractors & Services Ltd | Construction | 2022 |
| R Croft Management Limited | Arts & recreation | 2009 |
| R D Rees Plant Services Ltd | Manufacturing | 2021 |
| R E 4 Properties Limited | Real estate | 2023 |
| R E Morrish Ltd | Wholesale & retail | 2025 |
| R Edwards Electrical Services Ltd | Construction | 2023 |
| R F Building & Utilities Ltd | Construction | 2020 |
| R Flynn Engineering Limited | Wholesale & retail | 2016 |
| R G a Haulage Ltd | Transport & logistics | 2019 |
| R G W R Ltd | Real estate | 2025 |
| R Grillhouse Limited | Hospitality | 2023 |
| R H G Property Investments Limited | Real estate | 2021 |
| R H S Engineering Limited | | 1980 |
| R J & M J Phillips Limited | Health & social care | 2003 |
| R J Countryside Developments Ltd | Construction | 2021 |
| R J Rice Ltd | Administrative & support | 2015 |
| R J Smith Catering Wales Ltd | Hospitality | 2026 |
| R K Russell Ltd | Transport & logistics | 2010 |
| R K S Cardiff Ltd | Real estate | 2022 |
| R Lewis & Co (UK) Holdings Limited | Financial services | 2021 |
| R Lewis & Co (UK) Limited | Construction | 2007 |
| R M C Estates Limited | Real estate | 2002 |
| R M Gravesend Ltd | Construction | 2018 |
| R M J General Trading Limited | Wholesale & retail | 2025 |
| R M Rees & Co Limited | Professional & scientific | 2017 |
| R Matthews Contracting Limited | Construction | 2007 |
| R Matthews Holdings 2 Limited | Financial services | 2025 |
| R Matthews Holdings Limited | Financial services | 2017 |
| R Maxwell & Sons Ltd | Real estate | 2023 |
| R Parfitt Construction Limited | Construction | 2013 |
| R R Global Ltd | Water & waste | 2011 |
| R S Bakshi Limited | Real estate | 2016 |
| R S Entertainment Ltd | Construction | 2025 |
| R Singh & K Singh Limited | Real estate | 2018 |
| R Sourcing Limited | Wholesale & retail | 2018 |
| R Surveys Ltd | Professional & scientific | 2024 |
| R T Bodywork Specialists Limited | Wholesale & retail | 2017 |
| R T C Holdings (Wiltshire) Limited | Administrative & support | 2010 |
| R Thomas Plumbing and Heating Ltd | Construction | 2012 |
| R V Power Limited | Wholesale & retail | 2022 |
| R W 2024 Cyfyngedig | Real estate | 2024 |
| R W Waste Ltd | Water & waste | 2021 |
| R Willard Roofing Services Limited | Construction | 2016 |
| R Witts Photography Ltd | Professional & scientific | 2023 |
| R&A Creative Ltd | Professional & scientific | 2025 |
| R&A Wood Creations Ltd | Wholesale & retail | 2024 |
| R&B Essentials Ltd | Other services | 2022 |
| R&Co Solutions LLP | | 2023 |
| R&D Events Limited | Administrative & support | 2025 |
| R&D Heating Limited | Wholesale & retail | 2007 |
| R&D Iproperties Ltd | Real estate | 2019 |
| R&E Cleaning Services Ltd | Administrative & support | 2025 |
| R&G London Trade Ltd | Wholesale & retail | 2025 |
| R&G Property Cardiff Ltd | Real estate | 2024 |
| R&H Building Contractors Limited | Construction | 2016 |
| R&I Building Ltd. | Construction | 2018 |
| R&L Pawfit Ltd | Manufacturing | 2025 |
| R&Lb Limited | Health & social care | 2018 |
| R&M Thermal Insulations Ltd | Construction | 2017 |
| R&N Marketing Ltd | Administrative & support | 2026 |
| R&N Properties Cardiff Ltd | Real estate | 2025 |
| R&R (PMS) Limited | Information & communication | 2015 |
| R&R Cabs Ltd | Transport & logistics | 2020 |
| R&R Cardiff Ltd | Hospitality | 2025 |
| R&R Electrical Solutions Limited | Construction | 2016 |
| R&R Elite Services Limited | Construction | 2020 |
| R&R Tiling Ltd | Construction | 2019 |
| R&S Lifts Ltd | Construction | 2021 |
| R&S Trading Co. Ltd | Information & communication | 2025 |
| R&T Electrical Solutions Ltd | Construction | 2020 |
| R&T Holdings (Cardiff) Limited | Financial services | 2024 |
| R&V Building Projects Ltd | Construction | 2021 |
| R&W Hughes Roofing/Building Ltd | Construction | 2018 |
| R&Z Building Ltd | Construction | 2024 |
| R&Z Construction Ltd | Construction | 2021 |
| R. Churchill Building & Roofing Ltd | Construction | 2024 |
| R.A. Elliott & Associates Limited | Health & social care | 2006 |
| R.A. Jackson Limited | Other services | 1960 |
| R.A. Rail Services Limited | Construction | 2016 |
| R.A. Valleys Ltd | Arts & recreation | 2025 |
| R.C.Hillman Limited | Real estate | 1954 |
| R.C.T.I. Company UK Ltd | Construction | 2014 |
| R.Cartwright & Co. Limited | Professional & scientific | 1931 |
| R.E.D. Landscapes Ltd | Construction | 2017 |
| R.F.A. Manufacturing Limited | Professional & scientific | 1985 |
| R.H Interior Specialist Solutions Ltd | Manufacturing | 2018 |
| R.H. Jackson (Butchers) Limited | Real estate | 1947 |
| R.H.Babbage & SON Limited | Real estate | 1958 |
| R.K. Aggarwal Limited | Wholesale & retail | 1986 |
| R.Kuit & Ashley(Hindley)Limited | Manufacturing | 1965 |
| R.L.Glover(Motors)Limited | Real estate | 1964 |
| R.M.F Plumbing Limited | Construction | 2025 |
| R.Mason & Co Repairs Ltd | Wholesale & retail | 2018 |
| R.P.C.S Limited | Wholesale & retail | 2003 |
| R.S Express Services Ltd | Transport & logistics | 2018 |
| R.S. Construction Demolition and Groundworks Ltd | Construction | 2020 |
| R.S. Gascare Ltd | Construction | 2013 |
| R.S.T. Electrical Limited | Construction | 2003 |
| R.T. (Contractors) Limited | Construction | 1946 |