| Richards Investment & Consulting Limited | Financial services | 2024 |
| Richards Optometric Services Limited | Professional & scientific | 2023 |
| Richards Property Development Swansea Limited | Real estate | 2020 |
| Richmond Building and Maintenance Contractors Limited | Construction | 2009 |
| Richmond Court (Swansea) Limited | Households | 1966 |
| Richmond Mews (Management) Limited | Households | 1985 |
| Richmond Property Services (RPS) Ltd | Construction | 2023 |
| Richmond Villas (Management) Limited | Households | 1985 |
| Ricketts Radiators Limited | Wholesale & retail | 1977 |
| Ricklee Ltd | Administrative & support | 2021 |
| Ricko Properties Limited | Construction | 2022 |
| Ricochet Properties Ltd | Construction | 2018 |
| Ridertax Ltd | Professional & scientific | 2024 |
| Ridge Nooks Property UK Ltd | Extraterritorial | 2021 |
| Ridgetop Professional Roofing Ltd | Construction | 2025 |
| Ridgeways Limited | Administrative & support | 2003 |
| Ridgeways Trading Company Limited | Wholesale & retail | 2018 |
| Ridley Roofing & Building Ltd | Construction | 2026 |
| RIG Scaffolding (Swansea) Ltd | Construction | 2007 |
| Rigg Solutions Ltd | Extraterritorial | 2018 |
| Right NOW Foods Ltd | Hospitality | 2008 |
| Right to Manage Experts Limited | Professional & scientific | 2019 |
| Right Van Sales Limited | Wholesale & retail | 2025 |
| Rightbuild Building Contractors Ltd | Construction | 2020 |
| Rightpane Ltd | Construction | 2023 |
| Rigi Ground Rents Limited | Real estate | 2025 |
| Rimtalay Limited | Hospitality | 2025 |
| Ring Rock Cyclery Limited | Wholesale & retail | 2023 |
| Ringadoo Ltd | Information & communication | 2026 |
| RIO Rocks Building Limited | Construction | 2024 |
| Rio's Studio Ltd | Professional & scientific | 2025 |
| Rios Azul UK Limited | Health & social care | 2024 |
| Riots Autos Limited | Wholesale & retail | 2024 |
| Ripa Ltd | Hospitality | 2023 |
| Ripnrock Ltd | Arts & recreation | 2014 |
| Riri’S Pizza & Grill Ltd | Hospitality | 2025 |
| Rising Star Films Production CIC | Information & communication | 2025 |
| Rissala Polo UK Ltd | Professional & scientific | 2013 |
| Rissik House Holdings Limited | Construction | 2024 |
| Rita Logistics Ltd | Hospitality | 2016 |
| Ritchie Beynon Property Ltd | Real estate | 2026 |
| Rivadon Limited | Wholesale & retail | 1981 |
| Rivalslot Limited | Real estate | 1992 |
| River Hair Company Ltd | Other services | 2012 |
| Riverglade Accountancy Ltd | Professional & scientific | 2010 |
| Riverside Car and Van Sales Ltd | Wholesale & retail | 2021 |
| Riverside Fish Bar (Swansea) Limited | Hospitality | 2014 |
| Riverside Research Limited | Professional & scientific | 1995 |
| Riverside Supplies Limited | Manufacturing | 2000 |
| Riverside Water Technologies Limited | Construction | 1954 |
| Riversimple Holding Limited | Financial services | 2015 |
| Riviera Swan Properties Ltd | Real estate | 2021 |
| Rivoca Ltd | Real estate | 2026 |
| RJ & Sons Corporate Limited | Wholesale & retail | 2023 |
| RJ Building Services and Maintenance Ltd | Construction | 2021 |
| RJ Carro Services Limited | Transport & logistics | 2026 |
| RJ Collins Ltd | Professional & scientific | 2016 |
| RJ Construction & Renovations Ltd | Construction | 2021 |
| RJ Roofing Carmarthenshire Ltd | Construction | 2023 |
| RJ Services (South Wales) Ltd | Wholesale & retail | 2026 |
| RJ Thomas Properties Ltd | Real estate | 2025 |
| Rj's Pokeshop Ltd | Wholesale & retail | 2024 |
| RJC Estates Management Ltd | Real estate | 2025 |
| RJC Management Consultancy Limited | Professional & scientific | 2022 |
| RJM Autos Ltd | Wholesale & retail | 2020 |
| RJM Properties (Swansea) Limited | Real estate | 2022 |
| RJM Property Maintenance Ltd | Construction | 2006 |
| RJM Psychotherapy Ltd | Health & social care | 2022 |
| RJR Car & Commercial Limited | Wholesale & retail | 2016 |
| RJT Carpentry & Building Ltd | Manufacturing | 2024 |
| RJT Cheshire Limited | Households | 2019 |
| RJT Cornwall Limited | Households | 2019 |
| RJT Derbyshire Limited | Households | 2019 |
| RJT Holdings Ltd | Financial services | 2026 |
| RJT Property Ltd | Real estate | 2024 |
| RK Restaurant Ltd | Hospitality | 2016 |
| RKC Accountancy Ltd | Professional & scientific | 2009 |
| RL Stays Ltd | Hospitality | 2025 |
| RLB Home Improvements Ltd | Construction | 2023 |
| RLF Eco Services Limited | Water & waste | 2019 |
| RLJ Group Ltd | Professional & scientific | 2026 |
| RLO Property Ltd | Real estate | 2012 |
| RLW Healthcare Limited | Health & social care | 2026 |
| RM Blake Ltd | Construction | 2014 |
| RM Darleo Ltd | Wholesale & retail | 2023 |
| RM Sofas Ltd | Wholesale & retail | 2025 |
| RM Sports Analysis Limited | Information & communication | 2022 |
| RM7 Tax Ltd | Professional & scientific | 2022 |
| RMB Electrical Ltd | Construction | 2007 |
| Rmboutique Ltd | Other services | 2016 |
| RMC Systems Ltd | Information & communication | 2025 |
| Rmct Consulting Ltd | Professional & scientific | 2013 |
| Rmdp Limited | Health & social care | 2017 |
| RMH Property Ventures Ltd | Real estate | 2023 |
| RMI Vape Co Limited | Wholesale & retail | 2023 |
| RMP Installations Limited | Information & communication | 2020 |
| Rmppe Ltd | Wholesale & retail | 2023 |
| RMT Contracting Ltd | Information & communication | 2023 |
| RMT Transport Management Services Ltd | Administrative & support | 2024 |
| RNE Accounting Ltd | Professional & scientific | 2023 |