| Robert Campbell Consulting Ltd | Information & communication | 2013 |
| Robert George Group Ltd | Financial services | 2025 |
| Robert George Investments Ltd | Extraterritorial | 2022 |
| Robert George Ltd | Construction | 2018 |
| Robert Service Company Limited | Construction | 2000 |
| Robert Taussig Co. Limited | Wholesale & retail | 1983 |
| Roberto DM Limited | Construction | 2015 |
| Roberts Civils & Construction Ltd | Professional & scientific | 2019 |
| Roberts Executive Cars Limited | Transport & logistics | 2026 |
| Roberts Gallagher Construction Ltd | Construction | 2023 |
| Roberts Heating Ltd | Construction | 2022 |
| Roberts Muir Limited | Professional & scientific | 2015 |
| Robin Dash Ltd | Information & communication | 2023 |
| Robin Eyre Change Management Ltd | Professional & scientific | 2014 |
| Robin Ring Ltd | Financial services | 2019 |
| Robin Scott Limited | Information & communication | 1979 |
| Robinson House Corp Limited | Households | 2019 |
| Robkit Developments Ltd | Construction | 2017 |
| Robkit Enterprises Limited | Construction | 2012 |
| Robo' S African Convenient Food Store Ltd | Wholesale & retail | 2020 |
| Robobyte Services Limited | Information & communication | 2015 |
| Robots of London Ltd | Professional & scientific | 2020 |
| Robson's Associates Limited | Professional & scientific | 2014 |
| Roch Services Ltd | Professional & scientific | 2019 |
| Rock Foundation Properties Ltd | Real estate | 2017 |
| Rock Wall Facade Limited | Construction | 2025 |
| Rockabilly Motors Ltd | Wholesale & retail | 2024 |
| Rockberry Consulting Limited | Information & communication | 2019 |
| Rocket and Co Engineering Limited | Professional & scientific | 2012 |
| Rocket Barber Shop Limited | Other services | 2013 |
| Rocket Barber Shop Walthamstow Limited | Other services | 2015 |
| Rocket Brockley Ltd | Other services | 2019 |
| Rocket E17 Limited | Other services | 2017 |
| Rocket Homerton Ltd | Other services | 2023 |
| Rocket Leyton Limited | Other services | 2016 |
| Rocket Streatham Limited | Other services | 2022 |
| Rockettes Limited | Other services | 2017 |
| Rockgreen Limited | Real estate | 1973 |
| Rockingham Gate (Bushey) Residents Company Limited | Real estate | 1999 |
| Rockstar Consultancy Services Ltd | Professional & scientific | 2023 |
| Rockstar Properties Limited | Real estate | 2023 |
| Rocky Dog Software Ltd | Information & communication | 2022 |
| ROD Gonzales Limited | Health & social care | 2014 |
| Rodan Invest Ltd | Real estate | 2025 |
| Rodan Progress Ltd | Construction | 2024 |
| Rodgers Health Group Ltd | Health & social care | 2022 |
| Rodinciuc Ltd | Transport & logistics | 2020 |
| Roen GAS & Electric Ltd | Construction | 2020 |
| Roger Gracie Watford Limited | Wholesale & retail | 2023 |
| Roger Olive Electrical Ltd | Construction | 2016 |
| Rogers Associates Limited | Professional & scientific | 2002 |
| Roglazing Limited | Construction | 2020 |
| Rohni Process Solution Limited | Professional & scientific | 2011 |
| Roisure Limited | Information & communication | 2004 |
| Rojet Ltd | Construction | 2021 |
| Roland Gardens (Freehold) Limited | Households | 1998 |
| Rolefine Limited | Households | 1986 |
| Roller Wheels Skating Club Limited | Arts & recreation | 2024 |
| Rolling 27 Ltd | Extraterritorial | 2013 |
| Rolls N Rice Ltd | Hospitality | 2023 |
| Rolomex Food Manufacturer Limited | Manufacturing | 2012 |
| Roma Catering Limited | Hospitality | 2016 |
| Roma's Legacy Ltd | Administrative & support | 2026 |
| Roman Heights Residents Limited | Households | 2003 |
| Romanian Community CIC | Hospitality | 2024 |
| Romanian Retail Limited | Wholesale & retail | 2014 |
| Romb Estates Limited | Real estate | 2018 |
| Romdoc Ltd | Health & social care | 2019 |
| Romead Holdings Limited | Wholesale & retail | 2017 |
| Romico Ltd | Real estate | 2018 |
| Romsor Ltd | Transport & logistics | 2017 |
| Roneska Solutions Limited | Administrative & support | 2022 |
| Ronix (UK) Ltd | Other services | 2009 |
| Ronney's Novelty Ltd | Wholesale & retail | 2016 |
| Ronnie Sunshines Limited | Administrative & support | 2011 |
| Ronnie Wang Limited | Wholesale & retail | 2013 |
| Roof Gardens Management Company Limited | Households | 1989 |
| Roof Masters Watford Limited | Construction | 2011 |
| Roofrepairslondon Ltd | Construction | 2016 |
| Roofs-Uk Limited | Wholesale & retail | 2002 |
| Rooftop Apartments Developments Ltd | Real estate | 2019 |
| Roomade Ltd | Wholesale & retail | 2025 |
| Roomforrent Ltd | Information & communication | 2019 |
| Roomtrust Event Management Ltd | Administrative & support | 2014 |
| Roomtrust Systems Ltd | Information & communication | 2009 |
| Rooney Sustainable Homes Limited | Professional & scientific | 2019 |
| Root Access Ltd | Information & communication | 2012 |
| Rooted Parenting C.I.C. | Education | 2016 |
| Roots Teddington Ltd | Hospitality | 2022 |
| Ros-Wind Land and Property Ltd | Construction | 2013 |
| Rosal Business Ltd. | Other services | 2011 |
| Rosarlyn Investments Limited | Real estate | 2015 |
| Rosco Group Ltd | Construction | 2020 |
| Rose & Hall Financial Services Limited | Financial services | 2017 |
| Rose and Hugh Limited | Education | 2018 |
| Rose D9NTAL Limited | Health & social care | 2014 |
| Rose Grocers Limited | Wholesale & retail | 2007 |
| Rose PM Services Ltd | Health & social care | 2020 |
| Rose Property Enterprise Ltd | Real estate | 2018 |
| Rose's Caribbean Cuisine Limited | Hospitality | 2016 |