| RD Financial Consultancy Ltd | Professional & scientific | 2019 |
| RD Project Management Limited | Construction | 2015 |
| RDA Electrical Limited | Construction | 2014 |
| RDM Holding Group Ltd | Financial services | 2020 |
| RDM Housing Ltd | Real estate | 2020 |
| RDM Investment Group Ltd | Professional & scientific | 2020 |
| RDM Services Ltd | Professional & scientific | 2015 |
| Rdtb Properties Limited | Real estate | 2018 |
| RE Consulting Ltd | Professional & scientific | 2019 |
| Re:Invent Content Marketing Limited | Professional & scientific | 2020 |
| Reach Development Group Ltd | Construction | 2025 |
| Reachers Cars & Minibuses Ltd | Transport & logistics | 2009 |
| Reactive Tech Limited | Information & communication | 2014 |
| Real Castle Ltd | Real estate | 2018 |
| Real Cleaning Services Ltd | Administrative & support | 2019 |
| Real ERP Ltd | Information & communication | 2015 |
| Real K&L Construction Ltd | Construction | 2023 |
| Real Thai Cooking Ltd | Hospitality | 2024 |
| Realiable Help Limited | Administrative & support | 2016 |
| Realmont Charities Limited | Health & social care | 1995 |
| Realmont Management Limited | Construction | 1989 |
| Realtouch Associates Ltd | Professional & scientific | 2021 |
| Realty ZEN Ltd | Real estate | 2024 |
| Rebel Rebel Salon Limited | Other services | 2022 |
| Rebel Training Ltd | Professional & scientific | 2015 |
| Reby Media Ltd | Information & communication | 2014 |
| Recharge Energy Limited | Real estate | 2013 |
| Reclaim Residential Limited | Real estate | 2026 |
| Reco Accounting Services Ltd | Professional & scientific | 2013 |
| Recojunior Ltd | Arts & recreation | 2015 |
| Recojunior Properties Ltd | Real estate | 2023 |
| Reconstructing Minds Ltd | Professional & scientific | 2019 |
| Recover Building Ltd | Construction | 2012 |
| Recrev Ltd | Administrative & support | 2026 |
| Recruitnet Limited | Administrative & support | 2024 |
| Recsource Engineering Consultants Limited | Administrative & support | 2023 |
| Recycle Station Ltd | Wholesale & retail | 2014 |
| Recycling Bank Limited | Water & waste | 2004 |
| Red & Clay Limited | Information & communication | 2018 |
| Red 2 Black UK Limited | Administrative & support | 2007 |
| Red 8 Live Limited | Arts & recreation | 2022 |
| Red 8 Management Limited | Arts & recreation | 2022 |
| Red and Black Commercial Limited | Real estate | 2023 |
| Red Bean Ice Limited | Information & communication | 2025 |
| Red Dragon Developments Limited | Construction | 2002 |
| Red Flag Technology Private Ltd. | Information & communication | 2020 |
| Red Hawk Fire Solutions Ltd | Public administration | 2023 |
| Red Hearing Ltd | Wholesale & retail | 2019 |
| Red Kite Veterinary Consultants Limited | Professional & scientific | 2013 |
| Red Merlin Limited | Real estate | 2010 |
| Red Pepper Pizza Ltd | Hospitality | 2018 |
| Red Pillar Consultancy Limited | Information & communication | 2026 |
| Red Porch Ltd | Real estate | 2020 |
| Red Rock & Greenstone Limited | Administrative & support | 2010 |
| Red Tangerine Group Limited | Professional & scientific | 2022 |
| Red Technologies Limited | Information & communication | 2018 |
| Red Volta Ltd | Real estate | 2026 |
| Red Wolff Limited | Administrative & support | 2025 |
| Redas Associates Limited | Professional & scientific | 2014 |
| Redas Investments Limited | Real estate | 2016 |
| Redbus Media Limited | Professional & scientific | 2003 |
| Redbus Outdoor (Malls) Limited | Professional & scientific | 2006 |
| Reddconsult Limited | Arts & recreation | 2009 |
| Reddy Property Ltd | Real estate | 2020 |
| Reddy Recruitment Ltd | Administrative & support | 2022 |
| Redeez Resources Limited | Other services | 2024 |
| Redefine Hairworks Ltd | Manufacturing | 2025 |
| Redfearn Optical Services Limited | Professional & scientific | 2010 |
| Redhill Street Management Limited | Real estate | 1996 |
| Redhouse Creativity Limited | Information & communication | 2014 |
| Redifined Property Services Ltd | Households | 2019 |
| Redjar Food Ltd | Hospitality | 2026 |
| Redjoker Limited | Information & communication | 2015 |
| Redline Car Storage Limited | Transport & logistics | 2017 |
| Redpath Financial Planning Limited | Financial services | 2002 |
| Redray Limited | Administrative & support | 2018 |
| Redrobin Surveyors Ltd | Professional & scientific | 2025 |
| Redrock Operations Ltd | Real estate | 2026 |
| Reds Development Limited | Construction | 2016 |
| Redstacks Ltd | Wholesale & retail | 2023 |
| Redstowe Limited | Real estate | 2024 |
| Reducta (Holdings) Limited | Financial services | 1990 |
| Reducta (Sales) Limited | Manufacturing | 1963 |
| Redwing Surveying Ltd | Professional & scientific | 2015 |
| Reech Ltd | Administrative & support | 2013 |
| Reeds Auto Services Ltd | Wholesale & retail | 2025 |
| Reeds Court (Watford) Ltd | Real estate | 2020 |
| Reego Travel Ltd | Administrative & support | 2025 |
| Reelmark Ltd. | Transport & logistics | 2013 |
| Reels on Wheels Ltd | Transport & logistics | 2026 |
| Reena Anand Ltd | Professional & scientific | 2021 |
| Reepac Limited | Wholesale & retail | 2018 |
| Reevara Ltd | Wholesale & retail | 2025 |
| Reeve Consulting (UK) Ltd | Professional & scientific | 2020 |
| Reference Tree Limited | Extraterritorial | 2009 |
| Reficio Development Ltd | Construction | 2023 |
| Refillabell Workshops C.I.C. | Education | 2022 |
| Refollen Events Ltd | Administrative & support | 2008 |
| Reformation Accounts Limited | Professional & scientific | 2025 |
| Refynd Beauty Ltd | Other services | 2026 |