| Rental Brighton Ltd | Real estate | 2022 |
| Rep.Labpr Ltd | Information & communication | 2025 |
| Replica by Rhys Limited | Wholesale & retail | 2026 |
| Required Automotive Ltd | Wholesale & retail | 2025 |
| RES Commercial and Project Management Limited | Construction | 2015 |
| Rescare CIC | Health & social care | 2026 |
| Residential and Estate Support Services Ltd | Construction | 2025 |
| Reso Digital Limited | Education | 2025 |
| Resolutions (Wales) Limited | Professional & scientific | 2012 |
| Resolve Consultancy Services (UK) Ltd | Information & communication | 2014 |
| Resolven Pharmacy Ltd | Public administration | 2020 |
| Resource Efficiency Solutions Ltd | Professional & scientific | 2016 |
| Resource Resolutions Limited | Professional & scientific | 2002 |
| Resourcing Collective Limited | Professional & scientific | 2004 |
| Respiratory Training Wales Ltd | Education | 2023 |
| Response Support Services Limited | Water & waste | 2023 |
| Responsible Strategies Limited | Extraterritorial | 2003 |
| Rest Assured Property Solutions Ltd | Financial services | 2022 |
| Restaurant SW Ltd | Hospitality | 2026 |
| Restore Exteriors Ltd | Construction | 2026 |
| Restored.Swansea Limited | Arts & recreation | 2025 |
| Retail Solutions (Wales) Ltd | Construction | 2014 |
| Rethink PR & Marketing Ltd | Professional & scientific | 2020 |
| Retire Limited | Real estate | 2018 |
| Retirement Excellence CIC | Education | 2025 |
| Retro Solutions Ltd | Manufacturing | 2023 |
| Revamp Property Maintenance Limited | Construction | 2015 |
| Reverb Marketing & Communications Limited | Professional & scientific | 2003 |
| Reverse Attire Limited | Wholesale & retail | 2015 |
| Revia Properties & Investments Ltd | Real estate | 2025 |
| Revitalise Limited | Administrative & support | 2004 |
| Revive & Rejuvenate Ltd | Other services | 2018 |
| Revive Derma Clinic Ltd | Health & social care | 2022 |
| Revive Futures Ltd | Health & social care | 2026 |
| Revive Homes (South Wales) Ltd | Construction | 2025 |
| Revive Skin Aesthetics Ltd | Health & social care | 2021 |
| Revive Swansea Ltd | Other services | 2025 |
| Revived Property Ltd | Real estate | 2026 |
| Revolution Interiors Limited | Other services | 2013 |
| REW Enterprise Ltd. | Wholesale & retail | 2003 |
| Rewbridge Design Ltd | Professional & scientific | 2025 |
| Rewbridge Properties Ltd. | Real estate | 2018 |
| Rewent Ltd. | Wholesale & retail | 2003 |
| Rewild Gower CIC | Agriculture & fishing | 2025 |
| Rewise Foundation CIC | Information & communication | 2014 |
| Rewise Learning Limited | Information & communication | 2008 |
| Rewrite Subliminals Limited | Information & communication | 2025 |
| Rexford Valeting Limited | Administrative & support | 2024 |
| Reyhan Restaurant Limited | Hospitality | 2013 |
| Reynaldo Car Wash Ltd | Other services | 2015 |
| Reynolds Day Ltd | Information & communication | 2026 |
| Reynolds Hotel Limited | Hospitality | 2012 |
| RF Shielding Solutions Limited | Administrative & support | 2016 |
| Rfdj Ltd | Construction | 2026 |
| RFO Limited | Health & social care | 2023 |
| RG & Sons Town & Country Garden Services Limited | Other services | 2018 |
| RG Electrical Installation and Testing Ltd | Construction | 2021 |
| RGD Associates Ltd | Professional & scientific | 2010 |
| RGD Residential Ltd | Real estate | 2025 |
| RGI IT Solutions Limited | Information & communication | 2018 |
| Rgjl Limited | Hospitality | 2017 |
| RGM Engineering Maintenance Ltd | Extraterritorial | 2019 |
| RGM Security Limited | Administrative & support | 2014 |
| Rgrack Ltd | Wholesale & retail | 2023 |
| RGS Accountants Limited | Professional & scientific | 2013 |
| RGS Mortgages Limited | Financial services | 2023 |
| RHE U.K. Ltd | Professional & scientific | 2017 |
| RHEGZS324 Limited | Public administration | 2023 |
| Rheilffordd Limited | Hospitality | 2024 |
| RHF Installations Ltd | Construction | 2021 |
| Rhian Lindley Consulting Limited | Professional & scientific | 2024 |
| Rhian Loring Healthcare Services Limited | Health & social care | 2021 |
| Rhian's Diner Limited | Hospitality | 2023 |
| Rhino Lifting Limited | Manufacturing | 2012 |
| RHL Catering Ltd | Hospitality | 2005 |
| Rhocs Eiddo Ystad LLP | | 2020 |
| Rhondda Developments SPV 1 Ltd | Construction | 2022 |
| Rhondda Developments SPV 2 Ltd | Construction | 2023 |
| Rhos Car Wash Ltd | Other services | 2024 |
| Rhos Football Club Sports and Playing Fields Ltd | Arts & recreation | 2026 |
| Rhos Y Fedwen Limited | Households | 2023 |
| Rhossili Bunkhouse Limited | Hospitality | 2013 |
| Rhossili Leisure Limited | Hospitality | 2005 |
| Rhossili Lookout Limited | Hospitality | 2019 |
| Rhossili Sunflowers Limited | Wholesale & retail | 2021 |
| RHS Foods Ltd | Hospitality | 2020 |
| Rhydafon Technologies Limited | Professional & scientific | 2024 |
| Rhymney Developments Ltd | Construction | 2017 |
| Rhys Brown ONE2ONE Limited | Education | 2024 |
| Rhys Jones Homes Ltd | Real estate | 2016 |
| Rhys Jones Homes Management Ltd | Real estate | 2024 |
| Rhys-Lloyd Group Limited | Other services | 2018 |
| RI Pharma Limited | Wholesale & retail | 2008 |
| RIA International Limited | Wholesale & retail | 2023 |
| Rich Axon Limited | Real estate | 2017 |
| Rich Catering Limited | Hospitality | 2025 |
| Richamos Ltd | Health & social care | 2018 |
| Richard Meadley Associates Limited | Professional & scientific | 1991 |
| Richard S. Jones Ltd | Health & social care | 2008 |
| Richard Williams Electrical Limited | Construction | 2008 |