| Roshni's Health & Beauty Limited | Other services | 2005 |
| Rosie Bogle Ltd | Professional & scientific | 2023 |
| Rosie Cartwright Ltd | Professional & scientific | 2023 |
| Rosimeri Weirich Limited | Other services | 2019 |
| Roslea Company Limited | Construction | 1945 |
| Roslin Educational Limited | Education | 2007 |
| Rosmaria George Healthcare Limited | Health & social care | 2022 |
| Roson Group Ltd | Professional & scientific | 2023 |
| Ross & WYE Court (Ealing) Limited | Households | 1968 |
| Ross Electrical (UK) Services Limited | Construction | 2011 |
| Rossestech Limited | Information & communication | 2024 |
| Rosslyn Investments Limited | Construction | 1987 |
| Rosslyn Practice Limited | Health & social care | 2022 |
| Rossmore Finance NO 9 Limited | Financial services | 2024 |
| Rossmore Finance Number 8 Limited | Financial services | 2020 |
| Rostley Care Home Limited | Health & social care | 2025 |
| Rotamol Ltd | Wholesale & retail | 2000 |
| Rotary Brickwork Ltd | Construction | 2025 |
| Rotiling Ltd | Construction | 2016 |
| Rotli and Shaak Foods Limited | Hospitality | 2016 |
| Rottanda UK Limited | Real estate | 2021 |
| ROU Yacht Ltd | Transport & logistics | 2024 |
| Rouge Property Estates Ltd | Real estate | 2019 |
| Rouge UK Holdings Limited | Financial services | 2018 |
| Rouse Property Services Limited | Real estate | 2008 |
| Rouse Refurbs Limited | Real estate | 2010 |
| Route to Transition | Health & social care | 2013 |
| ROUTE2UNI International Group Limited | Education | 2024 |
| ROUTE79 Ltd | Construction | 2020 |
| Rovera Ltd | Real estate | 2017 |
| Rovers Return Birmingham Limited | Construction | 2013 |
| Rowan FEE Photography Limited | Professional & scientific | 2016 |
| Rowaround Properties Ltd | Construction | 2022 |
| Rowdash Motors Limited | Manufacturing | 2025 |
| Rowing Promotions Limited | Administrative & support | 1986 |
| Rowsham Court (Harrow) Limited | Households | 1970 |
| Rowswells Limited | Real estate | 1976 |
| ROX Contracts Limited | Construction | 2021 |
| ROX Interiors Limited | Construction | 2009 |
| Roxan Services Ltd | Construction | 2025 |
| Roxborough Avenue (Residents) Limited | Households | 1972 |
| Roxborough Heights Management (RTM) Limited | Other services | 2004 |
| Roxborough Road Flats Limited | Households | 1979 |
| Roxeth Green Avenue NO 73 Limited | Households | 2006 |
| Roxeth Youth Zone | Health & social care | 2008 |
| Roxi Invest Ltd | Construction | 2024 |
| Roxinford Education Group Ltd | Education | 2007 |
| Roxxstar Limited | Financial services | 2024 |
| Roxyalin Construction Ltd | Construction | 2018 |
| ROY Regis Limited | Extraterritorial | 2025 |
| Royal Tunbridge Trading Ltd | Professional & scientific | 2023 |
| Royal Winton Limited | Professional & scientific | 1993 |
| Royale Cars Hire Ltd | Administrative & support | 2025 |
| Royale Luxe Ltd | Wholesale & retail | 2020 |
| Royale Touch Events Ltd | Hospitality | 2018 |
| Rozaliaa Stefan Ltd | Construction | 2024 |
| RP Aesthetics Limited | Health & social care | 2023 |
| RP Associates Ltd | Other services | 2016 |
| RP Contracting Limited | Financial services | 2019 |
| RP Elevate Limited | Health & social care | 2025 |
| RP Estates Ltd | Administrative & support | 2016 |
| RP Films (London) Ltd | Administrative & support | 2018 |
| RP Pharma Distributions Ltd | Wholesale & retail | 2020 |
| RP Removals and Couriers Ltd | Transport & logistics | 2023 |
| RP Ventures Limited | Real estate | 2016 |
| RPA Specialist Consultancy Limited | Information & communication | 2025 |
| RPC Management Services Ltd | Construction | 2026 |
| RPD Properties (UK) Limited | Real estate | 2003 |
| Rpdp Properties Ltd | Real estate | 2020 |
| RPG 304 Limited | Real estate | 2022 |
| RPH Properties Ltd | Real estate | 2023 |
| Rpjs Holding Ltd | Real estate | 2021 |
| RPK Properties Ltd | Real estate | 2020 |
| RPM Homes Limited | Real estate | 2020 |
| RPP Kilburn Ltd | Hospitality | 2025 |
| RPS IT Solutions Limited | Information & communication | 2012 |
| RPSD2 Limited | Information & communication | 2016 |
| Rpth Associates Ltd | Professional & scientific | 2023 |
| RR Eyecare Ltd | Health & social care | 2023 |
| RR Home Developments Limited | Construction | 2018 |
| RR IT Consultancy & Services Ltd | Information & communication | 2019 |
| RR Property Consultants Ltd | Real estate | 2011 |
| RR Real Build Ltd | Construction | 2023 |
| RR School of Music Ltd | Arts & recreation | 2024 |
| RR SUB1 Ltd | Professional & scientific | 2022 |
| RR Wealth Management Ltd | Financial services | 2020 |
| Rraikmo Limited | Manufacturing | 2025 |
| Rrak Properties Limited | Real estate | 2019 |
| RRC Associates Limited | Information & communication | 2012 |
| Rrgs Freehold Ltd | Real estate | 2022 |
| Rrm-Designs Limited | Information & communication | 2017 |
| RRP Healthcare Limited | Extraterritorial | 2014 |
| Rrrb Services Ltd | Other services | 2025 |
| RRS Consultancy Limited | Professional & scientific | 2024 |
| RRT Cleaning and Driving Services Limited | Transport & logistics | 2013 |
| RRT Orthopaedics Limited | Health & social care | 2019 |
| RS & SR Ltd | Wholesale & retail | 2025 |
| RS Aesthetics Limited | Health & social care | 2025 |
| RS Consultancy Solutions Ltd | Information & communication | 2017 |
| RS Homes Hillingdon Ltd | Real estate | 2020 |