| RED19 Global Solutions Ltd | Professional & scientific | 2025 |
| Redback Films Limited | Information & communication | 1990 |
| Redsix Partnership Ltd | Professional & scientific | 2015 |
| Rees & Daughters Limited | Wholesale & retail | 2005 |
| Rees (Holdings) Limited | Professional & scientific | 2013 |
| Rees Brickwork Limited | Construction | 2019 |
| Rees Building & Development Ltd | Construction | 2007 |
| Rees Family Holdings Limited | Administrative & support | 2007 |
| Rees Industries Limited | Real estate | 1967 |
| Rees Metals Limited | Water & waste | 1983 |
| Rees Property Holdings Limited | Real estate | 2023 |
| Refinishing Studio Ltd | Construction | 2026 |
| Refresh Foods Ltd | Hospitality | 2020 |
| Refresh Stores Ltd | Hospitality | 2007 |
| Refynix Limited | Professional & scientific | 2026 |
| Regional Development Consultancy Ltd | Professional & scientific | 2010 |
| Rellevent Ltd | Administrative & support | 2019 |
| Reload Recovery Ltd | Other services | 2026 |
| Remobilise Ltd | Wholesale & retail | 2011 |
| Renewable Axess Ltd | Construction | 2019 |
| Renovate Body Repairs Ltd | Wholesale & retail | 2016 |
| Renovatexpert Limited | Construction | 2024 |
| Residential Project Management Services Ltd | Households | 2013 |
| Responsive Mechanical Services Ltd | Manufacturing | 2024 |
| Result Software Limited | Information & communication | 1997 |
| REV & Roll Ltd | Education | 2023 |
| Revival Fitness Coaching Ltd | Arts & recreation | 2025 |
| Revive Property Partners Ltd | Real estate | 2025 |
| Revived Media Ltd | Professional & scientific | 2024 |
| Revolt Electrical Services Ltd | Construction | 2024 |
| Revolution Maintenance Ltd | Professional & scientific | 2018 |
| RG2 Services Ltd | Arts & recreation | 2025 |
| RHD Consultancy Ltd | Professional & scientific | 2016 |
| Rhian's Cleaning Services Limited | Other services | 2015 |
| Rhiannon Art Ltd | Arts & recreation | 2013 |
| Rhiannon Starling Limited | Health & social care | 2018 |
| RHN Consultancy Ltd | Professional & scientific | 2021 |
| RHN Travel Ltd | Transport & logistics | 2025 |
| Richard Stephens Heating and Plumbing Ltd | Construction | 2020 |
| Richard Thomas Transport Limited | Transport & logistics | 1999 |
| Richies Meats Ltd | Wholesale & retail | 2015 |
| Rid-Xl Ltd | Transport & logistics | 2026 |
| RISHI2002 Ltd | Wholesale & retail | 2020 |
| Risk Kitchen Limited | Financial services | 2017 |
| River Bend Farm Ltd | Agriculture & fishing | 2020 |
| Riverden Group Ltd | Financial services | 2025 |
| RJ Construction Limited | Construction | 2013 |
| RJ Labour Services Ltd | Construction | 2025 |
| RJN Property Limited | Information & communication | 2025 |
| RK Surgical Ltd | Health & social care | 2021 |
| RLR Group Ltd | Hospitality | 2023 |
| RMD Engineering (Wales) Ltd | Manufacturing | 2012 |
| RN & LM Consultancy Limited | Professional & scientific | 2020 |
| RNF Albert Hall Ltd | Construction | 2021 |
| RNF Developments Ltd | Construction | 2020 |
| RNF Environmental Ltd | Water & waste | 2022 |
| RNF Group Holdings Ltd | Financial services | 2021 |
| RNF Investments Ltd | Hospitality | 2024 |
| RNF Services Limited | Other services | 2013 |
| Roadside Media Properties Limited | Administrative & support | 2024 |
| Roadside Poster Properties Limited | Administrative & support | 2025 |
| Roadway UK Logistics Ltd | Transport & logistics | 2020 |
| Rob-Automotive Ltd | Transport & logistics | 2015 |
| Roberts Griffiths Machinery Ltd | Wholesale & retail | 2018 |
| Roberts Keen Independent Financial Advisers Limited | Financial services | 2013 |
| Roberts Wealth & Financial Planning Ltd | Financial services | 2022 |
| Robow Consultancy Ltd | Professional & scientific | 2022 |
| Rockola Limited | Financial services | 2024 |
| ROD Ellis Ltd | Professional & scientific | 2017 |
| Rodact Limited | Real estate | 2006 |
| Rogers Industrial Equipment Limited | Manufacturing | 1971 |
| Ronnie S Evans Limited | Transport & logistics | 2010 |
| Ronnie S Evans Properties Limited | Administrative & support | 2017 |
| Ronnie S. Evans (Holdings) Limited | Transport & logistics | 2010 |
| Rosali Bridal Ltd | Wholesale & retail | 2026 |
| Rose Poppy Investments Ltd | Administrative & support | 2017 |
| Rossi`S Original Limited | Professional & scientific | 2005 |
| Roth Ventures Limited | Financial services | 2025 |
| Rototec-Spintec Limited | Wholesale & retail | 2014 |
| Rovac Holdings Ltd | Manufacturing | 2018 |
| ROY Insulations Ltd | Construction | 2024 |
| RS Automotive Engineering Ltd | Manufacturing | 2010 |
| RS Legal and Property Limited | Households | 2021 |
| RSM Evans Limited | Transport & logistics | 2006 |
| RTC Building Contractors Limited | Construction | 2014 |
| RTD & Sons Ltd | Construction | 1995 |
| Rubicon Safety Ltd | Professional & scientific | 2023 |
| Ruby Draig Ltd | Wholesale & retail | 2025 |
| Rubys Bar & Brasserie Limited | Hospitality | 2015 |
| Rune.Solutions Ltd | Professional & scientific | 2026 |
| Rural Timber Ltd | Manufacturing | 2021 |
| RW Environmental Ltd | Water & waste | 2018 |
| RWM Events and Consultancy Limited | Professional & scientific | 2025 |
| Ryan and Taylor Ltd | Hospitality | 2025 |
| Ryeclover Ltd | Wholesale & retail | 2012 |
| RZ Dine Limited | Hospitality | 2026 |
| Rêverine Ltd | Wholesale & retail | 2021 |
| S & M Pallets Limited | Wholesale & retail | 2016 |
| S Burt Properties Ltd | Real estate | 2020 |
| S Corfield Construction Ltd | Construction | 2020 |