| Rookwood Close (Even Numbers 30-40) Limited | Households | 1997 |
| Rookwood Close (ODD Numbers 21-31) Limited | Households | 1997 |
| Rookwood Close (ODD Numbers 33-43) Limited | Real estate | 1997 |
| Rookwood Heights Limited | Households | 1997 |
| Room Designs (UK) Ltd | Other services | 2013 |
| Room Jagger Group Ltd | Hospitality | 2023 |
| ROOM2RENTUK Ltd | Real estate | 2018 |
| Roomiespace Ltd | Wholesale & retail | 2024 |
| Rooms Property Group Ltd | Real estate | 2024 |
| Roomy Ltd | Hospitality | 2011 |
| Roosla Limited | Professional & scientific | 2025 |
| Rooster Camping Gear Ltd | Wholesale & retail | 2025 |
| Roosters Grill Shack International Ltd | Hospitality | 2020 |
| Root Accessories Ltd | Wholesale & retail | 2024 |
| Root Security Limited | Information & communication | 2015 |
| Rooted Beauty Limited | Other services | 2026 |
| Rootessence Ltd | Wholesale & retail | 2026 |
| Rootr Web Hosting Ltd | Information & communication | 2022 |
| Roots & Rotis CIC | Hospitality | 2025 |
| Roots Fundraising Ltd | Other services | 2019 |
| Roox Analysis Ltd | Professional & scientific | 2020 |
| Rope Access Resourcing Ltd | Construction | 2019 |
| Rope Access Tradesmen Limited | Construction | 2018 |
| Rope Graft Ltd | Other services | 2019 |
| Rope Reborn Ltd | Wholesale & retail | 2026 |
| Rope-Pro Access Solutions Limited | Administrative & support | 2015 |
| Ropetechnik Ltd | Professional & scientific | 2016 |
| Rory Taylor Limited | Professional & scientific | 2008 |
| ROS Jabar Medics Limited | Health & social care | 2016 |
| Rosa Stem Ltd | Wholesale & retail | 2020 |
| Rosaleesa Healthcare Ltd | Health & social care | 2021 |
| Rosaya Beauty Ltd | Health & social care | 2018 |
| Rosbeg Charter LLP | | 2024 |
| Rosbuild Limited | Construction | 2024 |
| Roscoes BBQ Grill Ltd. | Hospitality | 2015 |
| Rosdale Developments Limited | Real estate | 2014 |
| Rose (Newport) Estate Ltd | Real estate | 2023 |
| Rose Developments Cardiff Limited | Real estate | 2025 |
| Rose Holdings (Cardiff) Limited | Administrative & support | 2025 |
| Rose International Estate Ltd | Real estate | 2016 |
| Rose M Ltd | Construction | 2025 |
| Rose Parade Recording Community Interest Company | Information & communication | 2020 |
| Rose Peak Group Ltd | Other services | 2020 |
| Rose Properties Cardiff Limited | Real estate | 2022 |
| Rose Rees Limited | Professional & scientific | 2008 |
| Rose Research Limited | Professional & scientific | 2012 |
| Rose Retreat Spa Limited | Other services | 2024 |
| Rose-Innes Designs Limited | Professional & scientific | 2009 |
| Roseanne OT Limited | Professional & scientific | 2008 |
| Rosehall Resources Limited | Professional & scientific | 2019 |
| Rosejames Solutions Limited | Professional & scientific | 2020 |
| Roseland Dental Healthcare Limited | Health & social care | 2006 |
| Roseling Limited | Wholesale & retail | 2025 |
| Rosemary Nails & Spa Ltd | Other services | 2023 |
| Rosemary Roofing Ltd | Construction | 2026 |
| Rosemont Accounting Ltd | Professional & scientific | 2018 |
| Rosemont Consulting Services Ltd | Professional & scientific | 2024 |
| Rosenbird Ltd | Wholesale & retail | 2018 |
| Rosendale 99 Ltd | Information & communication | 2018 |
| Rosenfeld Ltd | Financial services | 2025 |
| Rosepool Recruits Ltd | Administrative & support | 2022 |
| Roses of Olympus Ltd | Wholesale & retail | 2020 |
| Rosewell-Marks Solutions Ltd | Professional & scientific | 2013 |
| Rosewood (Alsagar) Limited | Real estate | 2021 |
| Rosewood (Atherton) Limited | Construction | 2022 |
| Rosewood Property Development Ltd | Construction | 2020 |
| Rosewoodlavender Ltd | Wholesale & retail | 2025 |
| Rosewoods Care Limited | Health & social care | 2026 |
| Rosgon Recruitment Ltd | Administrative & support | 2020 |
| Roshanzaib Ltd | Wholesale & retail | 2025 |
| Rosi Regan Ltd | Professional & scientific | 2024 |
| Roskilly's Limited | Manufacturing | 1999 |
| Rosoman Ltd | Extraterritorial | 2021 |
| Ross - Business Consultancy Ltd | Financial services | 2020 |
| Ross Poole (Isleworth) Limited | Other services | 2015 |
| Ross Poole (UK) Limited | Professional & scientific | 2013 |
| Rossgold Limited | Wholesale & retail | 1998 |
| Rossi Homes Limited | Real estate | 2025 |
| Rossini & Damsel Limited | Hospitality | 2012 |
| Rossmanor Limited | Health & social care | 2008 |
| Rossondert Ltd | Wholesale & retail | 2026 |
| Rossprop Limited | Financial services | 2022 |
| Rost Ltd | Wholesale & retail | 2026 |
| Rost Media Ltd | Professional & scientific | 2018 |
| Rostella Limited | Administrative & support | 2017 |
| Rostov Media Group Ltd | Manufacturing | 2021 |
| Rostrum Global Limited | Information & communication | 2016 |
| Rosura Ltd | Wholesale & retail | 2019 |
| Rosvisco | Professional & scientific | 2025 |
| Rota Digital Ltd | Other services | 2025 |
| Rota Investments Ltd | Real estate | 2022 |
| Rotanev Limited | Information & communication | 2018 |
| Rotarunicolas Ltd | Construction | 2020 |
| Rotcore Records Ltd | Information & communication | 2018 |
| Rother Valley Commodities Limited | Manufacturing | 2011 |
| Rother Valley Press Limited | Manufacturing | 1984 |
| Rothhain Ltd | Wholesale & retail | 2021 |
| Rothwells Imports Ltd | Wholesale & retail | 2016 |
| Roti Darbar Dhaba Ltd | Hospitality | 2025 |
| Roti Darbar Food Ltd | Hospitality | 2025 |