| R63 Limited | Transport & logistics | 1990 |
| Rabwah Ltd | Real estate | 2021 |
| Raccoon Active Events Limited | Administrative & support | 2020 |
| Raccoon Events (Mena) Limited | Administrative & support | 2026 |
| Raccoon Events Limited | Administrative & support | 2016 |
| Raccoon Media Group Holdings Ltd | Financial services | 2023 |
| Racing Line Consulting Ltd | Professional & scientific | 2022 |
| RAD Corgi Games Ltd | Manufacturing | 2021 |
| Radar Training Limited | Extraterritorial | 2018 |
| Radiant HUT Limited | Wholesale & retail | 2020 |
| Radiatron Components Limited | Professional & scientific | 1969 |
| Radiatron Holdings Limited | Professional & scientific | 1983 |
| Radical Systems (UK) Limited | Information & communication | 1992 |
| Radical Systems Limited | Information & communication | 2022 |
| Radstock Land | | 2008 |
| Raffy's Limited | Hospitality | 2023 |
| RAG Traders London Ltd | Wholesale & retail | 2012 |
| Railaco LAU Cleaning Limited | Administrative & support | 2024 |
| Rainbow Health & Care Ltd | Health & social care | 2018 |
| Rais Consultants Ltd | Real estate | 2022 |
| Rajput Properties Limited | Real estate | 2017 |
| Rajul Technology Solutions Limited | Information & communication | 2021 |
| Ralfn | Financial services | 2020 |
| Ralge Limited | Administrative & support | 2010 |
| Ralph and Pippa Ltd | Wholesale & retail | 2020 |
| Ralph Ryan Construction Limited | Construction | 2021 |
| Ralph Ryan Homes Limited | Construction | 2021 |
| Ralph Ryan Interiors Limited | Wholesale & retail | 2024 |
| Ralph Ryan Investments (Farm Road) Limited | Real estate | 2026 |
| Ralph Ryan Investments (Oakley Road) Limited | Real estate | 2026 |
| RAM United Ltd | Information & communication | 2021 |
| Ramble Marbling Ltd | Manufacturing | 2023 |
| Ramon.Space UK Ltd | Manufacturing | 2023 |
| Ramsac Limited | Information & communication | 1992 |
| Randall Stuart Associates Limited | Financial services | 1980 |
| Rangerlab Studios CIC | Wholesale & retail | 2023 |
| Rangerlab Trading Ltd | Manufacturing | 2022 |
| Rangetrack Technologies Limited | Extraterritorial | 2016 |
| Rangom Limited | Real estate | 2024 |
| Rangrung Holdings Limited | Real estate | 2026 |
| Ranmore Consulting Ltd | Professional & scientific | 1998 |
| Ranmore Court Shalford (Management) Limited | Real estate | 1977 |
| RAP Kemp Properties Limited | Real estate | 2019 |
| Rapid Food Limited | Hospitality | 2024 |
| Rapid Launch Ltd | Information & communication | 2011 |
| Rapidcae Engineering&Consultancy Ltd | Information & communication | 2018 |
| Rara Warehouse Limited | Wholesale & retail | 2022 |
| Rareangels Ltd | Health & social care | 2025 |
| Rareform Limited | Financial services | 1995 |
| Ratchet Limited | Information & communication | 2014 |
| Rathplace Developments Limited | Construction | 2015 |
| Rating Publishers Limited | Information & communication | 1964 |
| Ratp DEV UK Ltd | Transport & logistics | 2010 |
| Ravenbridge Properties Limited | Real estate | 2025 |
| Ravenspoint Capital Limited | Professional & scientific | 2025 |
| Ravintomatka Limited | Manufacturing | 2025 |
| Raviz UK Ltd | Hospitality | 2017 |
| Rawlinson Partners Limited | Professional & scientific | 2009 |
| Rayan Enterprise (PVT) Ltd | Wholesale & retail | 2018 |
| Rayhan Market Limited | Wholesale & retail | 2020 |
| Raymond 1967 Limited | Extraterritorial | 2013 |
| Rayners (Buildings) Limited | Construction | 1948 |
| Raywood Court Management Company Limited | Households | 2011 |
| RB Care Limited | Health & social care | 2018 |
| RBA Acoustics Limited | Professional & scientific | 2002 |
| RCA Architecture and Design Limited | Professional & scientific | 2013 |
| Rclone Services Ltd | Information & communication | 2023 |
| Rcnw Ltd | Hospitality | 2017 |
| Rcrs Enterprises Limited | Professional & scientific | 2015 |
| RD Creative Holdings Ltd | Households | 2025 |
| RD Macey Composites Ltd | Professional & scientific | 2014 |
| RDC Heating Ltd | Construction | 2022 |
| Rdgs (Ratp DEV Global Sightseeing) Limited | Administrative & support | 2015 |
| Rdkb Ltd | Professional & scientific | 2022 |
| RE Adventures Ltd | Arts & recreation | 2013 |
| RE Financial Services Ltd | Professional & scientific | 2026 |
| React Robotics Limited | Information & communication | 2016 |
| Reactive Logistics Limited | Transport & logistics | 2008 |
| Readybus (Heathrow) Limited | Transport & logistics | 2008 |
| Realforce Limited | Professional & scientific | 2017 |
| Reality Co XYZ Ltd | Information & communication | 2026 |
| Realm Foundry Ltd | Information & communication | 2025 |
| Realquin Ltd | Financial services | 2024 |
| Rebecca Jane Designs Limited | Real estate | 2016 |
| Rebel Group Technologies Ltd | Wholesale & retail | 2026 |
| Recipe for Success Ltd | Professional & scientific | 2025 |
| Recordmended Ltd | Wholesale & retail | 2023 |
| Recover Cosmetics Limited | Wholesale & retail | 2013 |
| Recovery Capital CIC | Health & social care | 2024 |
| Recreational Sporting Ltd | Arts & recreation | 2020 |
| Recruitment FDS Limited | Other services | 2019 |
| Rectifier Ltd | Manufacturing | 2023 |
| Rectory Place (Guildford) Limited | Households | 1985 |
| Recurate Limited | Information & communication | 2024 |
| Red (London) Limited | Information & communication | 2015 |
| Red Angel Catering Limited | Hospitality | 2019 |
| Red Autocentres Ltd | Manufacturing | 2015 |
| Red Box Planning Ltd | Professional & scientific | 2021 |
| Red Branch Productions Ltd | Arts & recreation | 2014 |
| Red Clam Limited | Real estate | 2008 |