| Rojon Transporters Limited | Other services | 2011 |
| Rokim Tours and Travel Ltd | Administrative & support | 2023 |
| Roksa Cleaning Limited | Other services | 2013 |
| Rokyl Logistics Limited | Transport & logistics | 2018 |
| Roland Allen & Co. Limited | Other services | 1958 |
| Roland Construction Services Ltd | Transport & logistics | 2024 |
| Rolfe & Sons Group Ltd | Construction | 2026 |
| Rolii Ltd | Wholesale & retail | 2026 |
| Rolley LOW Ltd | Professional & scientific | 2023 |
| Rolling Wheels Ltd | Transport & logistics | 2019 |
| Rollo Dining Ltd | Professional & scientific | 2026 |
| ROM Team Solutions Ltd | Other services | 2022 |
| Roma Entertainment Limited | Information & communication | 2025 |
| Romaelvisuals Ltd | Information & communication | 2019 |
| Roman Accountancy Limited | Professional & scientific | 2014 |
| Roman BS Limited | Construction | 2024 |
| Romanian Contact Point UK CIC | Professional & scientific | 2024 |
| Romar Solutions Limited | Professional & scientific | 2013 |
| Romco Limited | Real estate | 2010 |
| Romeox Ltd | Wholesale & retail | 2025 |
| Romi's Garden Ltd | Wholesale & retail | 2025 |
| Romprod Ltd | Wholesale & retail | 2025 |
| RON Electrical Ltd | Construction | 2019 |
| Ronico Security Ltd | Administrative & support | 2012 |
| Ronnie MAC Limited | Professional & scientific | 2018 |
| Roof Over Head Properties Ltd | Real estate | 2026 |
| Roofline Roofing Solutions Limited | Construction | 2021 |
| ROOM4SPORT Ltd | Hospitality | 2026 |
| Roomi Investments Ltd | Real estate | 2023 |
| Rooms and Bloom Limited | Wholesale & retail | 2025 |
| Roop Ghotra Ltd | Construction | 2019 |
| Roopa Management Limited | Real estate | 2022 |
| Roopa Property Limited | Real estate | 2025 |
| Rooster Grill Ltd | Hospitality | 2023 |
| Root Community Transformation CIC | Administrative & support | 2015 |
| Roots & Matrix Limited | Other services | 2021 |
| Roots & Rights Community Interest Company | Professional & scientific | 2026 |
| Roots Occupational Therapy and Wellbeing Consultancy Ltd | Health & social care | 2020 |
| Roots Origin Ltd | Hospitality | 2020 |
| Roots Property Services Limited | Real estate | 2025 |
| Rope Rebels Limited | Construction | 2022 |
| Roralle Ltd | Wholesale & retail | 2025 |
| Rosa Anton Ltd | Administrative & support | 2022 |
| Rosa Logistics Ltd | Transport & logistics | 2025 |
| Rosalia Giugno Hair Limited | Other services | 2015 |
| Rosan Travel Limited | Administrative & support | 2012 |
| Rose Automotive Group Limited | Wholesale & retail | 2024 |
| Rose Blue Surveys and Groundworks Ltd | Construction | 2020 |
| Rose Garden Enterprises Limited | Real estate | 2008 |
| Rose Gold Housing Ltd | Real estate | 2024 |
| Rose Hill Aesthetics Ltd | Health & social care | 2025 |
| Rose Valley Estates Limited | Administrative & support | 2016 |
| Roseberry Management Ltd | Professional & scientific | 2002 |
| Rosebud Estates Ltd | Real estate | 1998 |
| Rosefrancisva Limited | Extraterritorial | 2021 |
| Roseground (UK) Limited | Real estate | 2012 |
| Roseground Limited | Construction | 2008 |
| Roses Home Care Limited | Health & social care | 2008 |
| Rosetta Bridge Ltd | Information & communication | 2025 |
| Roseyblue Ltd | Wholesale & retail | 2020 |
| Rosh Catering PVT Limited | Hospitality | 2022 |
| Roshan Trading & Investments Limited | Information & communication | 2026 |
| Rosjam Properties Ltd | Real estate | 2017 |
| Roslan Jewellers Ltd | Wholesale & retail | 2026 |
| Ross 1973 Limited | Extraterritorial | 2013 |
| Ross Witton Decorators (Harpenden) Ltd | Construction | 2020 |
| Rossbro Holdings Limited | Financial services | 2023 |
| Rossbro Limited | Construction | 1989 |
| Rosses Civils Ltd | Construction | 2021 |
| Rosu Transport Ltd | Transport & logistics | 2019 |
| Rosy Rose Limited | Wholesale & retail | 2016 |
| Rosygold Ltd | Wholesale & retail | 2020 |
| Rotaru Transport Ltd | Transport & logistics | 2026 |
| Rotary Beds, Bucks and Herts Limited | Other services | 2024 |
| Rotary Logistics Ltd | Transport & logistics | 2018 |
| Rothesay Homes Ltd | Construction | 2019 |
| Roti Junction Ltd | Hospitality | 2025 |
| Roto-Gen Limited | Construction | 2009 |
| Roumai Limited | Transport & logistics | 2021 |
| Round 1 Fightgear Limited | Wholesale & retail | 2023 |
| Round Green (Luton) Ltd | Manufacturing | 2009 |
| Round Green Chippy Ltd | Hospitality | 2025 |
| Round the Clock Care and Support Services Limited | Health & social care | 2018 |
| Roupa Ltd | Wholesale & retail | 2026 |
| Rousden Limited | Hospitality | 2017 |
| Route to Market Europe Limited | Administrative & support | 2017 |
| Routepro Limited | Construction | 2024 |
| Rowan Couriers Limited | Transport & logistics | 2024 |
| Rowington Homes Limited | Construction | 2015 |
| Rowles Home Care Ltd | Health & social care | 2025 |
| Rowles House Limited | Health & social care | 2002 |
| ROX Homes Limited | Real estate | 2019 |
| Roxins Solutions Limited | Professional & scientific | 2018 |
| Roxpal Ltd | Construction | 2017 |
| Roxstar Concierge Consulting Ltd | Administrative & support | 2015 |
| Roxsy Car Wash Limited | Other services | 2020 |
| Roxsy Detailing Ltd | Professional & scientific | 2025 |
| Royal Motor Traders Ltd | Wholesale & retail | 2020 |
| Royale Heritage Limited | Wholesale & retail | 2023 |
| Royall Rides Ltd | Transport & logistics | 2024 |