| Rextank Limited | Manufacturing | 2017 |
| Reynolds Air Conditioning Limited | Energy | 2023 |
| Reynolds Fitness Spa's Limited | Arts & recreation | 2011 |
| Reynolds Training Academy Ltd | Education | 1999 |
| RF Roofing Services Limited | Construction | 2022 |
| RG20 Ltd | Transport & logistics | 2017 |
| Rgav Distribution Limited | Wholesale & retail | 2010 |
| RGW Investments Ltd | Real estate | 2026 |
| Rhee Engineering Limited | Administrative & support | 2006 |
| Rhinefield House Hotel Limited | Hospitality | 1999 |
| Rhinefield Time Share Limited | Real estate | 1985 |
| Rhinefield Time Share Management Limited | Hospitality | 1986 |
| RHT Business Advisory Limited | Professional & scientific | 2017 |
| RHT Retail Group Limited | Wholesale & retail | 2017 |
| Rhubarb Crumble Limited | Wholesale & retail | 2008 |
| Rhwydwaith Ltd | Information & communication | 2013 |
| Rich Roberts Consultancy Limited | Professional & scientific | 2018 |
| Richard and Dawn Furlong LLP | | 2013 |
| Richard Elliott Architects Ltd | Professional & scientific | 2018 |
| Richard Hochfeld Management Limited | Professional & scientific | 2004 |
| Richard Smythe Limited | Manufacturing | 2004 |
| Ricketts Global Investments Ltd | Real estate | 2024 |
| Ridgewood Engineering Limited | Construction | 2000 |
| Ridgewood Sevenoaks Limited | Construction | 2011 |
| Ridley & Hicks Limited | Administrative & support | 2010 |
| Right Cash Ltd | Other services | 2013 |
| Rightform Ltd | Professional & scientific | 2025 |
| Rikama Education Limited | Administrative & support | 2015 |
| Rimell Partners Limited | Professional & scientific | 2014 |
| Rimunoor Limited | Hospitality | 2025 |
| Rioja Estates Limited | Professional & scientific | 2019 |
| Rioshap Investments Ltd | Construction | 2023 |
| Rioshap Mdvh Ltd | Construction | 2023 |
| Rishika PVT Limited | Professional & scientific | 2016 |
| Riskai Limited | Professional & scientific | 2024 |
| Risktae Limited | Professional & scientific | 2022 |
| Rite Torc Holdings Ltd | Financial services | 2019 |
| Rite Torc Services Ltd | Administrative & support | 2012 |
| River Lune Holdings Limited | Real estate | 2018 |
| Rivercourt RTM Limited | Extraterritorial | 2003 |
| Riverhead House Management Limited | Real estate | 2006 |
| Riverhead Properties Limited | Real estate | 2007 |
| Riverhill Gardens Limited | Arts & recreation | 2010 |
| Riverhill HCW Ltd | Administrative & support | 2024 |
| Rivermead Estates Ltd | Real estate | 2016 |
| Riveroak (MPS) Limited | Construction | 2014 |
| Riveroak (TJS) Limited | Construction | 2016 |
| Riversdale Investments Ltd | Extraterritorial | 2001 |
| Riverstone Products Ltd | Wholesale & retail | 2016 |
| Rivett Trading Limited | Wholesale & retail | 2007 |
| RJ Metalwork Ltd | Manufacturing | 2012 |
| RJC Holdings Kent Limited | Professional & scientific | 2015 |
| RK Trading Ltd | Wholesale & retail | 2018 |
| RM Fitness Ltd | Health & social care | 2025 |
| RM Services & Solutions Limited | Other services | 2020 |
| RMK Plant Limited | Administrative & support | 2022 |
| RMR Consultants Ltd | Professional & scientific | 2018 |
| RMS Recruitment Holdings Limited | Administrative & support | 2023 |
| Road Safety Answers Ltd | Professional & scientific | 2016 |
| Roam Adventure Vans Ltd | Wholesale & retail | 2010 |
| ROB Kenny Solutions Limited | Information & communication | 2013 |
| Robe Construction Ltd | Construction | 2024 |
| Robe Properties Ltd | Real estate | 2025 |
| Roberts-Jefferson Metal Roofing & Cladding Ltd | Construction | 2021 |
| Robinson Lowe Ltd | Professional & scientific | 2017 |
| Robinwood London Ltd | Wholesale & retail | 2026 |
| Robur Brooks Ltd | Professional & scientific | 2011 |
| Rock Revival C.I.C. | Wholesale & retail | 2022 |
| Rockmead Estates Limited | Construction | 1987 |
| Rockport Brickwork Limited | Construction | 2025 |
| Rockport Civil Engineering Limited | Construction | 2025 |
| Rockport-Group Limited | Construction | 2025 |
| Rockstar Bakers Ltd | Manufacturing | 2016 |
| Rockwell Group Holdings Company Limited | Extraterritorial | 2020 |
| Rockys Grab Hire Ltd | Water & waste | 2019 |
| Rodger Watson Ltd | Real estate | 2025 |
| Rodgers & Rodgers Limited | Professional & scientific | 1995 |
| Rodhett Ltd | Other services | 2020 |
| Roedean Heights Freehold Limited | Households | 2011 |
| Rogo Investments Ltd | Financial services | 2020 |
| Rogue Stunts Limited | Arts & recreation | 2021 |
| ROI Projects LLP | | 2007 |
| Rokkr Trading Limited | Financial services | 2025 |
| Roko Investments Ltd | Real estate | 2020 |
| Rolling and Trolling Ltd | Wholesale & retail | 2026 |
| Romeo Network Limited | Professional & scientific | 2026 |
| Romford Road Developments AC Ltd | Construction | 2020 |
| Rooksmead (Mount Farm) Ltd | Real estate | 2023 |
| Rooksmead Affordable Housing Limited | Real estate | 2024 |
| Rooksmead Investments Ltd | Real estate | 2021 |
| Rooksmead Residential (Cheltenham) Limited | Real estate | 2017 |
| Rooksmead Residential Limited | Real estate | 2017 |
| Rooksmead Securities Limited | Real estate | 2021 |
| Rooney's Boxing Hub Ltd | Arts & recreation | 2018 |
| Rory Barratt Design Ltd | Professional & scientific | 2015 |
| Rosario 154 Ltd | Hospitality | 2011 |
| Rose House (UK) Limited | Professional & scientific | 2001 |
| Roseacre Estates Limited | Real estate | 2021 |
| Roses Pink UK Limited | Hospitality | 2026 |
| Rosh Consulting Limited | Information & communication | 2024 |