| RJS Site Services Ltd | Construction | 2012 |
| RK Chinese Limited | Hospitality | 2021 |
| RK Global Arrow Ltd | Information & communication | 2025 |
| RKC Enterprises Limited | Administrative & support | 2015 |
| Rkms (Ryan Kemp Medical Services) Ltd | Health & social care | 2023 |
| RKP Accountancy Services Limited | Professional & scientific | 2015 |
| RKS Accounting Ltd | Professional & scientific | 2020 |
| RL Barber & Beauty Supplies Ltd | Wholesale & retail | 2025 |
| RL Ceilings & Partitions Ltd | Construction | 2018 |
| RL Consultancy Services Ltd | Real estate | 2025 |
| Rlah TM Ltd | Construction | 2021 |
| RLM Music Services Ltd | Arts & recreation | 2023 |
| RLS Comms Limited | Information & communication | 2014 |
| RM Property Ventures Ltd | Real estate | 2024 |
| RM Routledge Solutions Ltd | Professional & scientific | 2017 |
| RM Virdee Ltd | Real estate | 2026 |
| Rmacs Bar Limited | Hospitality | 2024 |
| RMB Evolutions Limited | Information & communication | 2012 |
| RMC Maintenance Ltd | Construction | 2021 |
| Rmct Cleaning Services Ltd | Administrative & support | 2022 |
| RMH Electrical Contractors Limited | Construction | 2014 |
| Rmkv Limited | Health & social care | 2012 |
| RMO Design Ltd | Professional & scientific | 2022 |
| RMT Software Ltd | Information & communication | 2023 |
| Rmwb Ltd | Information & communication | 2018 |
| RNG Technologies Ltd | Information & communication | 2015 |
| Rnhg Limited | Professional & scientific | 2023 |
| RNI Datatech Ltd | Information & communication | 2024 |
| RNI Investments Limited | Real estate | 2020 |
| Rnjs Investments Limited | Real estate | 2024 |
| RO Expert Ltd | Administrative & support | 2013 |
| RO98 Ltd | Professional & scientific | 2025 |
| Roadside Tyre Services Ltd | Wholesale & retail | 2025 |
| Roasted Red Pepper Catering Company Ltd | Hospitality | 2012 |
| ROB Clarke Media Services Limited | Extraterritorial | 2022 |
| ROB Moon Training Ltd | Professional & scientific | 2014 |
| ROB Palmer 87 Ltd | Hospitality | 2024 |
| ROB Wilson Limited | Wholesale & retail | 1997 |
| ROB Yearsley Consulting Ltd | Professional & scientific | 2023 |
| Rob's Copy Shop Limited | Professional & scientific | 2018 |
| ROB648G Limited | Administrative & support | 2024 |
| Robert Bruce Construction Limited | Construction | 1974 |
| Robert Half Holdings Limited | Professional & scientific | 2004 |
| Robert Half Limited | Administrative & support | 1987 |
| Robert Hunt Limited | Administrative & support | 2017 |
| Robert Ordway (Exports) Limited | Manufacturing | 1980 |
| Robery Forensic Engineering Limited | Professional & scientific | 2015 |
| Robin Brittain Scaffolding Limited | Construction | 2008 |
| Robin Property Development Ltd | Construction | 2025 |
| Robinhood House Ltd | Real estate | 2026 |
| Robinson & Co Kitchens & Bathrooms Limited | Construction | 2025 |
| Robinson & Co Plastering Limited | Construction | 2025 |
| Robinson & Rushe Limited | Wholesale & retail | 1973 |
| Robinson Brown Search Limited | Administrative & support | 2024 |
| Robotics & AI Consultancy Ltd | Information & communication | 2025 |
| Robust Operating Systems Limited | Information & communication | 1999 |
| Rochford House Limited | Administrative & support | 2019 |
| Rock My Limited | Extraterritorial | 2011 |
| Rock Traders UK Ltd | Wholesale & retail | 2020 |
| Rock View Cottages Ltd | Construction | 2024 |
| Rockaway Civils Limited | Construction | 2024 |
| Rocket Auto Holdings Limited | Wholesale & retail | 2019 |
| Rockpoint Construction Ltd | Construction | 2021 |
| Rockville Marketing Ltd | Professional & scientific | 2022 |
| Rockwell Black Limited | Real estate | 2013 |
| Rockwell Capital Holdings Limited | Financial services | 2026 |
| Rockwell Capital Limited | Financial services | 2017 |
| ROD Petty Construction Ltd | Construction | 2012 |
| Rodborough Consultancy Ltd | Professional & scientific | 2007 |
| Roesons Limited | Real estate | 2019 |
| ROF Electrical Services Ltd | Professional & scientific | 2009 |
| Rofern Limited | Real estate | 2021 |
| Roger Garner Building Company Limited | Construction | 1980 |
| Roger Lees Limited | Construction | 1966 |
| Rogley Holdings Ltd | Real estate | 2018 |
| Romain Angelier Limited | Professional & scientific | 2016 |
| Romkar Limited | Real estate | 2014 |
| Romy Holdings Ltd | Information & communication | 2020 |
| RON Thompson Machinery Co. Limited | Wholesale & retail | 1984 |
| Ronin Advisory Ltd | Information & communication | 2026 |
| Ronin Muay Thai Ltd | Arts & recreation | 2026 |
| Ronnilys Ltd | Hospitality | 2021 |
| Ronnoc Services Limited | Professional & scientific | 2019 |
| Roof & Lilies Ltd | Real estate | 2019 |
| Roof FIX Midlands Ltd | Construction | 2020 |
| Roof&Lilies Commercial Ltd | Real estate | 2022 |
| Roof&Lilies Homes Ltd | Real estate | 2022 |
| ROOFBOXES4U Ltd | Wholesale & retail | 2023 |
| Roofing Services Midland Ltd | Construction | 2015 |
| Rookery Associates Ltd | Administrative & support | 2021 |
| Rookvale Ltd | Other services | 2015 |
| Room 4 U Ltd | Wholesale & retail | 2022 |
| Room 5 Ltd | Construction | 2016 |
| Room Bond Limited | Other services | 2002 |
| Rooted Essence Ltd | Wholesale & retail | 2025 |
| Rora Gray Ltd | Professional & scientific | 2023 |
| Rorcon Group Ltd | Financial services | 2025 |
| Rorcon Ltd | Construction | 1998 |
| Rosa 410728 Holdings Ltd | Financial services | 2026 |
| Rosa Accommodation Ltd | Real estate | 2026 |