| Ride WIF ME Ltd | Professional & scientific | 2025 |
| Rider Recruits Ltd | Administrative & support | 2018 |
| Rider's Cycle Cardiff Ltd | Manufacturing | 2025 |
| Ridewithelka Limited | Wholesale & retail | 2018 |
| Ridge Group Fit-Out Limited | Professional & scientific | 2023 |
| Ridgeline Recruitments Solutions Ltd | Administrative & support | 2023 |
| Ridgeway Investments Limited | Real estate | 1997 |
| Ridgeway Legal Services Limited | Professional & scientific | 2023 |
| Ridgmont(Catering Services ) Ltd | Hospitality | 2007 |
| Ridha Tech Ltd | Information & communication | 2025 |
| Ridings Management (Cyncoed) Limited | Households | 2012 |
| Rifinna Limited | Wholesale & retail | 2025 |
| Riftforgeita Ltd | Information & communication | 2026 |
| Right Angles PR Ltd | Professional & scientific | 2017 |
| Right Choice Kitchens Limited | Construction | 2017 |
| Right Choice Property Solutions Ltd | Construction | 2023 |
| Right Choice Rooms Limited | Real estate | 2016 |
| Right Choice Utility Ltd | Professional & scientific | 2018 |
| Right Click Accounting Ltd | Professional & scientific | 2019 |
| Right Container Storage Ltd | Extraterritorial | 2021 |
| Right Directions Global Trading Ltd | Wholesale & retail | 2025 |
| Right Gear Motors Ltd | Wholesale & retail | 2018 |
| Right Hand Hero Limited | Information & communication | 2023 |
| Right Home Investments Ltd | Real estate | 2021 |
| Right Lifts Ltd | Construction | 2018 |
| Right Move Contractors Limited | Construction | 2014 |
| Right on Resourcing Ltd | Administrative & support | 2018 |
| Right Propertylink UK Ltd | Construction | 2013 |
| Right Recruiting Ltd | Administrative & support | 2021 |
| Right Source Property Ltd | Real estate | 2019 |
| Right Talent Limited | Professional & scientific | 2011 |
| Rightacres Investment One Limited | Real estate | 2024 |
| Rightacres Property Co. Limited | Construction | 1969 |
| Rightacres Property Developments Limited | Real estate | 2024 |
| Rightacres Property Group Limited | Real estate | 2016 |
| Righteous Partners Group Ltd | Financial services | 2016 |
| Righteous Roofing Ltd | Construction | 2024 |
| Righthousemate Ltd | Real estate | 2015 |
| Rightnow Digital Ltd | Administrative & support | 2010 |
| Rightsearch Information Limited | Extraterritorial | 2019 |
| Rightsearch Limited | Extraterritorial | 2019 |
| Rightsearch Property Information Limited | Extraterritorial | 2019 |
| Rightsearch Solutions Ltd | Professional & scientific | 2010 |
| Rigid Scaffold Solutions Ltd | Construction | 2026 |
| Rigovidap Limited | Wholesale & retail | 2022 |
| Riha Group Ltd | Households | 2017 |
| Riha Properties Limited | Hospitality | 2015 |
| Rihabtech Ltd | Wholesale & retail | 2025 |
| Riimex Group Ltd | Professional & scientific | 2022 |
| Riimon Holdings Ltd | Information & communication | 2021 |
| Riise Consultancy Ltd | Information & communication | 2020 |
| Riital Ltd | Hospitality | 2023 |
| Riival Sports Limited | Information & communication | 2021 |
| Riko Logistic Ltd | Transport & logistics | 2020 |
| Rilli Ltd | Wholesale & retail | 2024 |
| Rilo Ltd | Wholesale & retail | 2025 |
| Rilonson Ltd | Wholesale & retail | 2025 |
| Rilwan World Limited | Information & communication | 2020 |
| Rimal Khathaf for Business Limited | Wholesale & retail | 2025 |
| Rimant Corporation PC | | 2017 |
| Rimko Plumbing Ltd | Construction | 2025 |
| Rimzone Contractors Ltd | Construction | 2025 |
| Rinaston Court Management Company Ltd | Households | 2023 |
| Ringmasteruk Ltd | Wholesale & retail | 2015 |
| Ringo Hammersmith Ltd | Hospitality | 2018 |
| Rinse Mobile Detailing Ltd | Administrative & support | 2021 |
| RIO Architects (London) Limited | Professional & scientific | 2015 |
| RIO FC Ltd | Hospitality | 2019 |
| RIO Green Limited | Professional & scientific | 2010 |
| Riot Time Pictures Limited | Information & communication | 2018 |
| Ripple Ribs Limited | Wholesale & retail | 1989 |
| Risby Consulting Group Limited | Administrative & support | 2023 |
| Rise Bakeries Ltd | Hospitality | 2020 |
| Rise Care Limited | Health & social care | 2017 |
| Rise Care SW Limited | Health & social care | 2025 |
| Rise Construction Cardiff Limited | Construction | 2022 |
| Rise Moon Ltd | Hospitality | 2022 |
| Rise Trend International Limited | Professional & scientific | 2013 |
| RISE9DESIGN Ltd | Information & communication | 2024 |
| Risebray Limited | Health & social care | 2025 |
| Rishko Beauty Ltd | Other services | 2019 |
| Rising Star ITD Limited | Wholesale & retail | 2025 |
| Rising Sun Solar Ltd | Wholesale & retail | 2024 |
| Rising Sun Trading & Consulting Ltd | Administrative & support | 2017 |
| Rising Tide Soft Limited | Information & communication | 2025 |
| Risk Managed Services Limited | Professional & scientific | 2014 |
| Risk Management & Solutions Limited | Administrative & support | 2019 |
| Risk Zone HSE Consultancy Ltd | Professional & scientific | 2024 |
| RISK24 Limited | Administrative & support | 2016 |
| Riskaversity Ltd | Information & communication | 2018 |
| Riso Limited | Wholesale & retail | 2017 |
| Ristel Investments Ltd | Financial services | 2021 |
| Rita Property Solutions Ltd | Real estate | 2018 |
| Rite Homes Cardiff Limited | Real estate | 2016 |
| Rite Recruitment Services Ltd | Administrative & support | 2022 |
| Ritehome Property Ltd | Real estate | 2024 |
| Ritetrack (Cardiff) Ltd | Wholesale & retail | 2012 |
| Ritko Exim Ltd | Wholesale & retail | 2017 |
| Rituelmumler Ltd | Wholesale & retail | 2025 |
| Riuh Group Limited | Wholesale & retail | 2021 |