| Rosemont RHL Limited | Hospitality | 2002 |
| Rosemoor Management Company Limited | Households | 2023 |
| Roserich (UK) Limited | Real estate | 2011 |
| Rosha Group Ltd | Construction | 2021 |
| Roshen Care Group Limited | Health & social care | 2026 |
| Rosie Leighs of Devonport Ltd | Hospitality | 2024 |
| Ross Bryant Financial Limited | Financial services | 2012 |
| ROSS4U Ltd | Transport & logistics | 2025 |
| Rotiz Healthcare Ltd | Health & social care | 2025 |
| Rouch Cleaning Services Ltd | Transport & logistics | 2026 |
| Rouge London Limited | Wholesale & retail | 2025 |
| Round Brick Properties Ltd | Construction | 2021 |
| Round One Films Ltd | Information & communication | 2015 |
| Roundhouse Web Designs Ltd | Information & communication | 2021 |
| Roundtable Consulting Limited | Professional & scientific | 2023 |
| Roundy RDJ Ltd | Hospitality | 2025 |
| Routeways Centre Limited | Health & social care | 1997 |
| Rowans 818 Limited | Households | 2023 |
| Rowe & Associates Ltd | Professional & scientific | 2026 |
| Rowe & Co.Cornwall(Properties)Limited | Construction | 1953 |
| Rowe (SW) Holdings Ltd | Professional & scientific | 2011 |
| Rowe Electrical Engineers Limited | Construction | 2009 |
| Rowe Estates (UK) Limited | Construction | 1953 |
| Rowe Estates Holdings Limited | Professional & scientific | 2005 |
| Rowe Potatoes Limited | Agriculture & fishing | 2024 |
| Rowe Property Developments Limited | Professional & scientific | 2004 |
| Rowett Construction & Groundworks Ltd | Construction | 2025 |
| Rowse Limited | Wholesale & retail | 2004 |
| Roxie Cosmetics Ltd | Wholesale & retail | 2019 |
| Roxy Cars Limited | Wholesale & retail | 2024 |
| ROY Davey Contracting Limited | Agriculture & fishing | 2014 |
| Royal Adelaide Art & Yoga CIC | Administrative & support | 2018 |
| Royal Plymouth Corinthian Yacht Club Limited | Arts & recreation | 2012 |
| Royal William Yard Marina Limited | Transport & logistics | 2017 |
| Rozco Construction Ltd | Construction | 2019 |
| RP Decor Ltd | Construction | 2026 |
| RP T/A Bengal Ltd | Hospitality | 2018 |
| RP Technician Ltd | Professional & scientific | 2012 |
| RP8 Limited | Wholesale & retail | 2020 |
| RPB Reporting Ltd | Health & social care | 2018 |
| RPB Vehicle Solutions Ltd | Wholesale & retail | 2004 |
| RPC Engineering Limited | Construction | 2014 |
| RPC Land Ltd | Extraterritorial | 2009 |
| RPM GAS Supplies Limited | Wholesale & retail | 2009 |
| RPM Revenue Ltd | Professional & scientific | 2025 |
| RPP Studios Ltd | Arts & recreation | 2025 |
| RR Brand Ltd | Wholesale & retail | 2024 |
| RS Lock Ltd | Hospitality | 2022 |
| RS PUB Management Limited | Hospitality | 2019 |
| RS Twenty 2 Limited | Real estate | 2015 |
| Rssa Investments Limited | Real estate | 2018 |
| RST Real Estate Investment Ltd | Real estate | 2023 |
| Rstore Limited | Extraterritorial | 2014 |
| RT Electrical Engineers Ltd | Construction | 2026 |
| RT Graphics Ltd | Manufacturing | 2017 |
| RT the Boss Ltd | Other services | 2020 |
| RT3 Consultancy Ltd | Information & communication | 2012 |
| RTC Training and Safety Ltd | Professional & scientific | 2018 |
| Rtek South West Ltd | Arts & recreation | 2025 |
| Rtes Electrical Ltd | Construction | 2026 |
| RTH RAD Limited | Professional & scientific | 2018 |
| RTJ Martin Group Holdings Limited | Financial services | 2024 |
| RTO Media Limited | Professional & scientific | 2025 |
| Rubane Leisure Group Ltd | Wholesale & retail | 2019 |
| Rubbish Clearance Surrey Ltd | Water & waste | 2019 |
| Rubus Limited | Hospitality | 2024 |
| Rubys Dock Ltd | Hospitality | 2025 |
| Ruckus Marketing Ltd | Professional & scientific | 2017 |
| Rudrasai Ltd | Wholesale & retail | 2015 |
| Ruff-Dog RAW Ltd | Wholesale & retail | 2025 |
| Rukiro Ltd | Administrative & support | 2016 |
| RUM Barberz Ltd | Other services | 2023 |
| Runkings Limited | Wholesale & retail | 2017 |
| Runner Sameday Transport Ltd | Transport & logistics | 2025 |
| Running Dog Theatre CIC | Arts & recreation | 2021 |
| Russell Anaesthetics Ltd | Health & social care | 2021 |
| Russell Martin Ltd | Other services | 2022 |
| Russells Flooring Ltd | Wholesale & retail | 2011 |
| Russells Group Limited | Professional & scientific | 2018 |
| Russells Properties Ltd | Real estate | 2019 |
| Rusty Sheds Limited | Hospitality | 2022 |
| Rusty Tractor Ltd | Hospitality | 2023 |
| Ruthon Ltd | Wholesale & retail | 2024 |
| RV Services UK Ltd | Construction | 2007 |
| RW Consulting Ltd | Information & communication | 2026 |
| Rwandiz Ltd | Hospitality | 2023 |
| Rwandz Delivery Ltd | Hospitality | 2025 |
| Rwandz Restaurant Ltd | Hospitality | 2025 |
| RWCARS2025 Limited | Wholesale & retail | 2025 |
| RWH Construction Ltd | Construction | 2020 |
| RWK Barber Ltd | Other services | 2026 |
| RWT Carpets Limited | Construction | 2025 |
| RY Orthopaedics Limited | Health & social care | 2022 |
| Ryan Jack Consulting Ltd | Professional & scientific | 2026 |
| Ryan Jenkins Electrical Limited | Manufacturing | 2024 |
| Ryan Poultry Services Limited | Administrative & support | 1984 |
| Ryan Wilson Conveyors Ltd | Professional & scientific | 2026 |
| Rybinski & Co Ltd | Real estate | 2026 |
| Rybinskimcdonnell Estates Ltd | Real estate | 2025 |
| Ryder Investment | Professional & scientific | 2024 |