| Robinson & Bowens Properties Limited | Real estate | 2015 |
| Robinson Management Services Ltd | Professional & scientific | 2022 |
| Robinson-Jones Consulting Ltd | Professional & scientific | 2025 |
| Robo-Logic Solutions Ltd | Professional & scientific | 2022 |
| Roboost Limited | Information & communication | 2013 |
| Robust Details Limited | Professional & scientific | 2003 |
| Rocco Enterprises Ltd | Wholesale & retail | 2025 |
| Rocco Investments Limited | Real estate | 2014 |
| Roccopia Developments Limited | Construction | 2017 |
| Roccopia Investments 2 Ltd | Real estate | 2016 |
| Roccopia Investments 3 Limited | Construction | 2018 |
| Roccopia Investments 4 Limited | Real estate | 2018 |
| Roccopia Investments Limited | Construction | 2013 |
| Rocga Research Limited | Information & communication | 2017 |
| Rochelle White Group Limited | Professional & scientific | 2022 |
| Rocinante Property Management Ltd | Real estate | 2016 |
| Rock Hard Music Limited | Wholesale & retail | 2007 |
| Rock Hope Limited | Health & social care | 2020 |
| Rock Integrated Systems Limited | Information & communication | 1995 |
| Rock Steady Ltd | Financial services | 2026 |
| Rock Water Healthcare Limited | Real estate | 2008 |
| Rocket 301 Marketing Ltd | Administrative & support | 2017 |
| Rocketsweet Ltd | Wholesale & retail | 2026 |
| Rockfeller Property & Investment Trust Limited | Professional & scientific | 1946 |
| Rockline Logistics Limited | Transport & logistics | 2025 |
| Rocksteady Coaching Limited | Other services | 2015 |
| Rockwave Ltd | Other services | 2020 |
| Rockwell Automation Limited | Manufacturing | 1966 |
| Rockwell Circle Limited | Other services | 2025 |
| Rockwell Commercial Holdings Limited | Professional & scientific | 2009 |
| Rockwell Engineering UK Limited | Professional & scientific | 2026 |
| Rockwell European Holdings Limited | Administrative & support | 1980 |
| Rockwell Group Ltd | Real estate | 2015 |
| Rockwell International | Administrative & support | 1950 |
| Rockwell International Pension Trustees Limited | Financial services | 1973 |
| Rockwell Martyn Ltd | Manufacturing | 2018 |
| Rockyland Drilling Limited | Professional & scientific | 2020 |
| Rockz Production Service Limited | Transport & logistics | 2024 |
| Rocso Site Services Ltd | Construction | 2011 |
| Rocxr Ltd | Wholesale & retail | 2025 |
| ROD Engineering Ltd | Professional & scientific | 2025 |
| Roda Solutions Limited | Information & communication | 2024 |
| Rodisoft Solutions Ltd | Information & communication | 2022 |
| Rodriguesv Ltd | Construction | 2024 |
| Roebb Installation Services Limited | Other services | 2004 |
| Rogers Builders (Aylesbury) Limited | Construction | 1986 |
| Rogers Rental Limited | Real estate | 1988 |
| Rogers Residential Limited | Real estate | 2018 |
| ROH Enterprises Ltd | Real estate | 2019 |
| Rohm Electronics Europe Limited | Professional & scientific | 2000 |
| Rohraj Investments Limited | Real estate | 2025 |
| Rohtau Limited | Information & communication | 2020 |
| ROI Group Limited | Administrative & support | 2001 |
| Roial Caring Services Ltd | Health & social care | 2015 |
| Rojun Properties Limited | Real estate | 2024 |
| Roka Asset Management Limited | Professional & scientific | 2025 |
| Roka Management Group Ltd | Professional & scientific | 2025 |
| Rokaboat Advisory Ltd | Professional & scientific | 2022 |
| Rokerite Property Investments Ltd | Real estate | 2026 |
| Rokk Building Products Ltd | Wholesale & retail | 2007 |
| ROL Engineering Limited | Professional & scientific | 2014 |
| Rola Properties Limited | Real estate | 2004 |
| Roland Archange Ltd | Wholesale & retail | 2025 |
| Roland Enterprises Ltd | Other services | 2019 |
| Roll Over N Play Dead Ltd | Arts & recreation | 2019 |
| Roll Video Limited | Information & communication | 2026 |
| Rollers (U.K.) Limited | Professional & scientific | 1991 |
| Rollfastuk Ltd | Wholesale & retail | 2026 |
| Rolling Wheels Photography Limited | Other services | 2013 |
| Rollonz Technology Ltd | Information & communication | 2015 |
| Roluxa Ltd | Real estate | 2025 |
| Romain Decorators Ltd | Construction | 2024 |
| Roman Cladding (RCL) Ltd | Construction | 2015 |
| Roman Park Flats Management (NO.2) Limited | Households | 1987 |
| Roman Park Flats Management (NO.4) Limited | Households | 1990 |
| Roman Park Management Limited | Hospitality | 1985 |
| Roman Park View Ltd | Hospitality | 2026 |
| Roman Plumbing & Heating Services Ltd | Construction | 2015 |
| Roman Rooms Ltd | Hospitality | 2025 |
| Romanelli Italian Restaurant Ltd | Hospitality | 2022 |
| Romanelli's Italian Food Ltd. | Extraterritorial | 2015 |
| Romanelli's Italians Food Ltd. | Hospitality | 2022 |
| Romar Service Centre MK Ltd | Manufacturing | 2008 |
| Romayne Limited | Real estate | 2019 |
| Romcas Transport Ltd | Transport & logistics | 2024 |
| Romeo Electrico Limited | Construction | 2019 |
| Romimoment Limited | Real estate | 2020 |
| Romsutaza Limited | Transport & logistics | 2015 |
| Romtech UK Limited | Wholesale & retail | 2009 |
| RON Cave Roofing Ltd | Construction | 2019 |
| Roni Car Valeting Limited | Wholesale & retail | 2012 |
| Roni Hand Car Wash Ltd | Other services | 2004 |
| Ronly RO Limited | Wholesale & retail | 2026 |
| Ronobo Ltd | Information & communication | 2007 |
| Roodytamer Ltd | Financial services | 2022 |
| Roofer UK Network Limited | Construction | 2012 |
| Rooffix Southern Limited | Construction | 2026 |
| Room Escape London Limited | Education | 2016 |
| ROOM44 Limited | Professional & scientific | 2014 |
| ROOMS2RENT Limited | Real estate | 2024 |