| RMR Development Limited | Real estate | 2018 |
| RMT Management Limited | Professional & scientific | 2025 |
| RND Realtors Ltd | Real estate | 2022 |
| Ro-Tel FM Ltd | Real estate | 2012 |
| ROB Sulman Motion Limited | Administrative & support | 2016 |
| Robart Developments Ltd | Construction | 2022 |
| Robert & Friends Limited | Professional & scientific | 2013 |
| Robert Denney Services Ltd | Information & communication | 2015 |
| Robert Page Property Ltd | Real estate | 2025 |
| Robin FX Ltd | Professional & scientific | 2016 |
| Robobike 4D Limited | Other services | 2025 |
| Robobike IP Limited | Other services | 2025 |
| Robobike Ltd | Other services | 2024 |
| Robosfx Ltd | Information & communication | 2019 |
| ROC Remotes Limited | Information & communication | 2010 |
| Rocco Mana (Management) Limited | Real estate | 2014 |
| Rock Media Marketing Ltd | Professional & scientific | 2020 |
| Rockbridge Medical Ltd | Professional & scientific | 2016 |
| Rocketship Jobs Ltd | Information & communication | 2024 |
| Rockford Real Estate Limited | Administrative & support | 2013 |
| Rockheath Limited | Professional & scientific | 2020 |
| Rockstarx Ltd | Information & communication | 2022 |
| Rockurstyle Ltd | Arts & recreation | 2020 |
| Rocky Property Services Limited | Information & communication | 2016 |
| Rodev Inc Limited | Construction | 2026 |
| Rogo Productions Limited | Arts & recreation | 2020 |
| Rohan & Co. Limited | Real estate | 1977 |
| Roka Search Limited | Administrative & support | 2020 |
| Roliver Constructions Ltd | Construction | 2021 |
| Roll UP Catering Ltd | Hospitality | 2023 |
| Rollingfilmandtv Ltd | Transport & logistics | 2019 |
| ROM BR Construction Ltd | Construction | 2018 |
| Romain Prasad Limited | Administrative & support | 2009 |
| Roman Road Management Company Limited(The) | Households | 1985 |
| Romima (Management) Limited | Real estate | 2014 |
| Ronco Investments Limited | Professional & scientific | 2023 |
| Roof KNG Ltd | Construction | 2019 |
| Rookwood Advisors Ltd | Professional & scientific | 2024 |
| Room Key Capital Limited | Financial services | 2017 |
| Room Key Ltd | Real estate | 2017 |
| Roots & Future Ltd | Wholesale & retail | 2025 |
| Roots and Hoots Limited | Wholesale & retail | 2020 |
| Rophet Property Co.Limited | Real estate | 1958 |
| Rosary Manor Freehold Limited | Real estate | 2025 |
| Rose & Crown Rickmansworth Ltd | Hospitality | 2017 |
| Rose Court (Ingatestone) Management Company Limited | Professional & scientific | 2014 |
| Rose Gold Limited | Other services | 2012 |
| Rose Sydney Limited | Wholesale & retail | 2020 |
| Rosecam Limited | Health & social care | 2022 |
| Rosegoldi Ltd | Health & social care | 2022 |
| Rosenberry's Limited | Administrative & support | 2013 |
| Rosenthal Design Services Limited | Other services | 2010 |
| Roseplex Services Limited | Administrative & support | 2009 |
| Rosevic Aesthetics Ltd | Other services | 2025 |
| Roseward Investments Limited | Financial services | 2024 |
| Rosewood Medical Consultancy Ltd | Professional & scientific | 2019 |
| Rosneft Marine (UK) Limited | Wholesale & retail | 2008 |
| Rospet Packaging Limited | Professional & scientific | 1997 |
| Ross Motors (Streatham) Ltd | Other services | 2014 |
| Rossetti House Management Limited | Households | 2023 |
| Rostrack Limited | Construction | 2021 |
| Rotar Electrics Ltd | Construction | 2018 |
| Rotm Limited | Wholesale & retail | 2020 |
| Roto VR Ltd | Wholesale & retail | 2015 |
| Rotten ROW Limited | Information & communication | 2004 |
| Rough and Refined Ltd | Professional & scientific | 2017 |
| Rough CUT Ltd | Arts & recreation | 2025 |
| Round Bush Management Company Limited | Real estate | 2011 |
| Roundhill Developments Limited | Construction | 2024 |
| Roundwood Management Limited | Professional & scientific | 2016 |
| Rounton Place (Watford) Management Company Ltd | Households | 2014 |
| Route 2066 Ltd | Professional & scientific | 2025 |
| Route to Market Excellence Ltd | Wholesale & retail | 2022 |
| Rowalk Holdings Limited | Wholesale & retail | 2010 |
| Rowe-It Group Ltd | Administrative & support | 2025 |
| Rowit Limited | Information & communication | 2005 |
| Rowland Park Management Company Limited | Households | 2005 |
| Rowtrack Limited | Extraterritorial | 2017 |
| Roxas Learning Solutions Ltd | Administrative & support | 2019 |
| Roxy London Driving School Ltd | Education | 2021 |
| ROY Poribar Group Ltd | Real estate | 2026 |
| RP OPS Consultancy Ltd | Professional & scientific | 2026 |
| RPB Worldwide Ltd | Information & communication | 2023 |
| RPC Property Maintenance Limited | Construction | 2021 |
| Rpfu Ltd | Real estate | 2020 |
| RPM Advisory Limited | Administrative & support | 2021 |
| RPO Electrical Ltd | Construction | 2018 |
| Rpuk Investments Limited | Financial services | 2012 |
| Rpuk London Limited | Financial services | 2023 |
| Rrgm Properties Limited | Construction | 2025 |
| RS & UC Development Limited | Construction | 2023 |
| RS Best Food & Wine Ltd | Wholesale & retail | 2023 |
| RS Build&Renovate Ltd | Construction | 2024 |
| RS Legal Search Ltd | Administrative & support | 2015 |
| RS3 Consulting Limited | Information & communication | 2018 |
| RSM Media Group Ltd | Arts & recreation | 2024 |
| RSP Developments and Investments Limited | Construction | 2011 |
| RSY Holdings Limited | Financial services | 2021 |
| Rtribe Technical Services Limited | Information & communication | 2017 |
| Rtsd Limited | Wholesale & retail | 2018 |