| Rockingham Reins Limited | Arts & recreation | 2018 |
| Rockland Homes Ltd | Real estate | 2019 |
| ROCKPORT24 Ltd | Professional & scientific | 2021 |
| Rocque Investments Limited | Real estate | 2002 |
| Rod's Academy CIC | Other services | 2020 |
| Rodean Developments Limited | Construction | 2003 |
| Rodenstock (U.K.) Limited | Manufacturing | 1932 |
| Rodin's Kitchen Ltd | Hospitality | 2025 |
| Rodrigo Electrical and Refrigeration Ltd | Construction | 2025 |
| Roeburn Capital Ltd | Financial services | 2015 |
| Roffed Ltd. | Professional & scientific | 1992 |
| Roko Properties Ltd | Real estate | 2023 |
| Roktom Care Ltd | Hospitality | 2020 |
| Roktom Jewels Limited | Wholesale & retail | 2016 |
| Rollins Tools Group Limited | Wholesale & retail | 2026 |
| Roman One Ltd | Real estate | 2024 |
| Roman Stone Paving Ltd | Extraterritorial | 2023 |
| Roman Three Ltd | Real estate | 2025 |
| Roman Two Ltd | Real estate | 2024 |
| Roman-Stockwell Consultants Ltd | Other services | 2025 |
| Romar Properties Limited | Households | 2023 |
| Romax Investment Ltd | Real estate | 2020 |
| Romford Road Developments GU Ltd | Construction | 2020 |
| Romford Road Developments PS Ltd | Construction | 2020 |
| Romtech Electrical Ltd | Construction | 2020 |
| Ronel Limited | Administrative & support | 2014 |
| Roni Rail Ltd | Construction | 2019 |
| Roof Rescue Ltd | Construction | 2015 |
| Roofing Specialist Group Ltd | Construction | 2026 |
| Roofline Ltd | Construction | 2025 |
| Roofteam Limited | Construction | 2016 |
| Roofwizards Limited | Construction | 2022 |
| ROOM8 Limited | Real estate | 2024 |
| Roots College Limited | Education | 2024 |
| Roots Management Consultancy (PVT) Ltd | Information & communication | 2010 |
| Rosalie KAY Ltd | Administrative & support | 2024 |
| Rosam Enterprises Ltd | Real estate | 2022 |
| Rosam Health Consultancy Ltd | Health & social care | 2021 |
| Rosca Group Limited | Construction | 2013 |
| Roscourt Estates Limited | Agriculture & fishing | 2015 |
| Rose & Albert Property Co Ltd | Real estate | 2023 |
| Rose & Crown (Dartford) Limited | Hospitality | 2020 |
| Rose Joy Ltd | Wholesale & retail | 2025 |
| Rose Summer Ice Ltd | Hospitality | 2025 |
| Rosedaniel Events Ltd. | Other services | 2014 |
| Rosegrove Developments Limited | Construction | 1988 |
| Rosemont Services Limited | Real estate | 2002 |
| Rosenheim Technologies Ltd | Information & communication | 2023 |
| Rosewood Future Investments Limited | Financial services | 2021 |
| Ross Decor Limited | Construction | 2017 |
| Rotobb Global Property Group Limited | Real estate | 2025 |
| Rouc Property Ltd | Real estate | 2025 |
| Roughneck Limited | Extraterritorial | 2006 |
| Roundhouse Tech Limited | Information & communication | 2025 |
| Route 66 Garage & Recovery Ltd | Transport & logistics | 2012 |
| Routex Limited | Transport & logistics | 1980 |
| Rowe & Simmonds Building Services Limited | Construction | 2023 |
| Rowin Design & Build Limited | Administrative & support | 2015 |
| ROX Food Services Limited | Wholesale & retail | 2023 |
| ROX Holdings Limited | Real estate | 2020 |
| ROX Meat Limited | Wholesale & retail | 2017 |
| Roxboro Design Limited | Information & communication | 2023 |
| Roxrose London Communications Limited | Information & communication | 2025 |
| ROY Properties Group Limited | Real estate | 2025 |
| Royale Muzik Productionz Ltd | Wholesale & retail | 2024 |
| Royce & Daughters Interior Design Ltd | Extraterritorial | 2017 |
| Rozey Records Group Limited | Information & communication | 2019 |
| RP Arnold Limited | Professional & scientific | 2012 |
| RP Supply Group Limited | Wholesale & retail | 2026 |
| RP Traders Ltd. | Wholesale & retail | 2016 |
| Rplogic UK Ltd | Extraterritorial | 2021 |
| RPO Complete Packhouse Services Limited | Professional & scientific | 2022 |
| RR Skin, Body & Laser Clinic Ltd | Other services | 2022 |
| RR Social Care Limited | Health & social care | 2021 |
| RRB Services Ltd. | Construction | 2016 |
| RS Coffee (Bearwood) Limited | Hospitality | 2016 |
| RS Coffee (Bromsgrove) Limited | Hospitality | 2022 |
| RS Coffee (Chelmsley Wood) Limited | Wholesale & retail | 2016 |
| RS Coffee (Cotteridge) Limited | Hospitality | 2019 |
| RS Coffee (Hall Green) Limited | Hospitality | 2022 |
| RS Coffee (Northfield) Ltd | Wholesale & retail | 2016 |
| RS Coffee (Sheldon) Limited | Hospitality | 2019 |
| RS Coffee (Smethwick) Limited | Hospitality | 2020 |
| RS Coffee Limited | Hospitality | 2019 |
| RS Ductwork Services Ltd | Construction | 2021 |
| RS Equities Ltd | Real estate | 2024 |
| RS Group (London) Ltd | Construction | 2018 |
| RS Group Companies Limited | Financial services | 2019 |
| RS Group Investments Limited | Financial services | 2018 |
| RS Vehicle Maintenance Ltd | Wholesale & retail | 2017 |
| RS1 Fitness Ltd | Arts & recreation | 2016 |
| RS2 Fitness Ltd | Arts & recreation | 2019 |
| Rsalpha Tech Limited | Information & communication | 2024 |
| RSC Training Ltd | Education | 2015 |
| Rsdj Property Solutions Ltd | Construction | 2025 |
| RSE Testing & Maintenance Ltd | Construction | 2017 |
| Rsgd (Barnsley) Limited | Hospitality | 2021 |
| Rsgd (Boar Lane) Limited | Hospitality | 2021 |
| Rsgd (Boucher) Limited | Hospitality | 2022 |
| Rsgd (Byres Road) Limited | Hospitality | 2024 |