| Rkundan Ltd | Health & social care | 2014 |
| RKV Solutions Ltd | Information & communication | 2025 |
| RKZ Hotel and PUB Company Ltd | Hospitality | 2020 |
| RL Distribution AMZ Limited | Administrative & support | 2021 |
| RL Engineering Group Limited | Professional & scientific | 2026 |
| RL Stylum Ltd | Other services | 2018 |
| Rlal Limited | Other services | 2016 |
| Rlam Investment Ltd | Financial services | 2018 |
| RLC & Partners Ltd | Professional & scientific | 2017 |
| RLC Inc Ltd | Other services | 2019 |
| Rlgd Ltd | Hospitality | 2024 |
| RLH Associates Limited | Administrative & support | 2018 |
| RLH Estates Limited | Real estate | 2026 |
| RLJ & Co Ltd | Professional & scientific | 2008 |
| Rljd Civils & Groundworks Ltd | Construction | 2019 |
| RLK Estate Agents Ltd | Real estate | 2018 |
| RLL Property Services Limited | Real estate | 2022 |
| Rllt Consultancy Ltd | Professional & scientific | 2011 |
| Rlosolar Limited | Construction | 2025 |
| Rlslabouringservices CYF | Administrative & support | 2025 |
| Rluk Fire Ltd | Construction | 2022 |
| RLW Surgical Limited | Health & social care | 2022 |
| RM Brothers Limited | Hospitality | 2023 |
| RM Ecoair Services Ltd | Construction | 2025 |
| RM Global Holdings Ltd | Financial services | 2025 |
| RM Global Performance Ltd | Education | 2019 |
| RM Heating Solutions Penarth Limited | Construction | 2023 |
| RM Inspection Services Ltd | Manufacturing | 2018 |
| RM Lifts Ltd | Construction | 2025 |
| RM Retail Store Ltd | Wholesale & retail | 2024 |
| RM Techniek Bouw Ltd | Construction | 2024 |
| RMA Holdings Limited | Wholesale & retail | 2018 |
| Rmab Consulting Ltd | Administrative & support | 2015 |
| Rmartialarts Ltd | Arts & recreation | 2020 |
| RMB Capital Limited | Financial services | 2020 |
| RMC 1 Limited | Construction | 2017 |
| RMC AV Ltd | Information & communication | 2014 |
| RMC Engineering Ltd | Manufacturing | 2015 |
| RMC Property Solutions Limited | Construction | 2016 |
| Rmc-Rt Limited | Manufacturing | 2019 |
| RMD Technologies Limited | Administrative & support | 2017 |
| RMF 2024 Limited | Wholesale & retail | 1996 |
| RMI Construction Limited | Construction | 2023 |
| RMI Group Limited | Wholesale & retail | 2017 |
| RMJ Accessories Ltd | Wholesale & retail | 2025 |
| RML MAN & Van Ltd | Water & waste | 2022 |
| RMM SPV 1 Ltd | Other services | 2025 |
| Rmmj Ltd | Financial services | 2022 |
| RMP Scaffold Solutions Limited | Construction | 2019 |
| Rmparts Ltd | Extraterritorial | 2017 |
| Rmpts Ltd | Administrative & support | 2020 |
| RMS Healthcare Limited | Health & social care | 2019 |
| RMS Retail Construction Ltd. | Construction | 2019 |
| RMS Technology Limited | Information & communication | 2019 |
| Rmsm Consultancy Limited | Professional & scientific | 2019 |
| RMZ Trade London Ltd | Wholesale & retail | 2025 |
| RNC Build Ltd | Construction | 2024 |
| Rnceese Limited | Wholesale & retail | 2025 |
| RND Capital Ltd | Administrative & support | 2012 |
| RNE Consulting Limited | Wholesale & retail | 1984 |
| RNG Engineering Limited | Professional & scientific | 2017 |
| RNH Anaesthetics Ltd | Health & social care | 2019 |
| RNH Automation Limited | Manufacturing | 2002 |
| Rnjones Properties Ltd | Real estate | 2019 |
| RNS Global Limited | Administrative & support | 2015 |
| RNU Transport Ltd | Transport & logistics | 2025 |
| Rnwl Ltd | Financial services | 2019 |
| RNZ UK Ltd | Transport & logistics | 2012 |
| RO Holdings Limited | Professional & scientific | 2022 |
| Roach Holdings Ltd | Construction | 2020 |
| Roacompanybiz Ltd | Wholesale & retail | 2025 |
| Road Krave Ltd | Hospitality | 2026 |
| Road Occountment Limited | Information & communication | 2021 |
| Road Runner Loads Logistic Ltd | Professional & scientific | 2013 |
| Roadaway Limited | Administrative & support | 2025 |
| Roadchef (Employee Benefits Trustees) Limited | Professional & scientific | 1993 |
| Roadline Traffic Management Ltd | Construction | 2019 |
| Roadmentor Driving School Ltd | Education | 2025 |
| Roadrunner Recovery & Valeting Ltd | Transport & logistics | 2022 |
| Roamcraft Ltd | Transport & logistics | 2025 |
| Roaming IT Limited | Information & communication | 2012 |
| Roar Engineering Limited | Construction | 2018 |
| Roath Cottage Limited | Hospitality | 2013 |
| Roath Court Flats Service Limited | Households | 1959 |
| Roath Housing Company Limited | Construction | 1988 |
| Roath Mill Limited | Information & communication | 2023 |
| Roath Minimarket Ltd | Wholesale & retail | 2024 |
| Roath Park Dairy Company Ltd | Manufacturing | 2015 |
| Roath Park Indian Ltd | Hospitality | 2024 |
| Roath Park Management Company Limited | Professional & scientific | 2007 |
| Roath Park Properties Limited | Real estate | 1974 |
| ROB Adams Implantology Limited | Health & social care | 2017 |
| ROB POL Trans Ltd | Wholesale & retail | 2014 |
| Robans Electrical Ltd | Construction | 2017 |
| Robbal Ltd | Wholesale & retail | 2023 |
| Robbie Jones Ltd | Arts & recreation | 2026 |
| Robert a Bleasdale Frcp Limited | Health & social care | 2019 |
| Robert E Lloyd Limited | Wholesale & retail | 1987 |
| Robert Hugh Limited | Professional & scientific | 2005 |
| Robert James Web Services Limited | Information & communication | 2018 |