| R2 Brickwork (Derby) Limited | Construction | 2015 |
| R2 Brickwork Limited | Construction | 2017 |
| R2 Danescroft LLP | | 2026 |
| R2 Developments Ltd | Construction | 2009 |
| R2 Logistics Ltd | Transport & logistics | 2026 |
| R2 Properties Limited | Construction | 2011 |
| R3 (Brownlow) Limited | Construction | 2023 |
| R3 Estates Limited | Financial services | 2021 |
| R5 Ltd | Construction | 2011 |
| R5 Sidhu Limited | Real estate | 2024 |
| R5N Ltd | Information & communication | 2025 |
| R9 Holdings Limited | Real estate | 2025 |
| RA Consultant Engineering Ltd | Professional & scientific | 2019 |
| RA Plumbing & Heating Limited | Construction | 2026 |
| RA Toor Limited | Real estate | 2026 |
| RA Tyre Ltd | Wholesale & retail | 2025 |
| Ra&Gg Ltd | Information & communication | 2018 |
| RAA Real Estate LLP | | 2024 |
| Raaa Property Ltd | Real estate | 2024 |
| Raaf Constructions Limited | Construction | 2024 |
| Rabah Engineering Services Limited | Professional & scientific | 2022 |
| Rabbani Care Ltd | Health & social care | 2021 |
| Rabi Nambi Dermatology Services Ltd | Health & social care | 2011 |
| Rabohan Limited | Wholesale & retail | 2023 |
| Racket Ready Ltd | Education | 2024 |
| Rad-Law Limited | Professional & scientific | 2018 |
| Radbourne Gate Management Company (Number 1) Limited | Households | 2004 |
| Radbourne Investments Limited | Construction | 2024 |
| Radford Castle Limited | Construction | 2014 |
| Radi Homes Property Investment Ltd | Real estate | 2021 |
| Radiant Bathrooms Limited | Construction | 2024 |
| Radiant Heat Limited | Manufacturing | 2017 |
| Radical Fire Family International Ministry CIC | Other services | 2025 |
| Radical International Limited | Professional & scientific | 2000 |
| Radical Thinking Ltd | Professional & scientific | 2025 |
| Radio Control Distribution Company Limited | Other services | 2004 |
| Radio Ikhlas Limited | Information & communication | 2006 |
| Radnik Kennels Ltd | Agriculture & fishing | 2025 |
| Radon Security Ltd | Administrative & support | 2016 |
| Radraxman Limited | Health & social care | 2026 |
| Radstone Properties Ltd | Real estate | 2017 |
| RAE Ingrey Mentoring Ltd | Professional & scientific | 2024 |
| RAE Invest Ltd | Financial services | 2025 |
| RAE Talks Mental Health Limited | Health & social care | 2022 |
| RAF Affinity Ltd | Information & communication | 2013 |
| Rahhat Ltd | Real estate | 2025 |
| Rahman & Sons Properties Ltd | Real estate | 2024 |
| RAI Distribution Ltd | Wholesale & retail | 2026 |
| RAI Portfolio Ltd | Construction | 2024 |
| Raihan Autos Limited | Wholesale & retail | 2022 |
| Raihan Travel Ltd | Transport & logistics | 2025 |
| Raiim Limited | Real estate | 2025 |
| Rail Aspects Limited | Professional & scientific | 2016 |
| Rail Electrification Consultancy Limited | Professional & scientific | 2014 |
| Rail Forum | Administrative & support | 2009 |
| Rail MAN Ltd | Professional & scientific | 2026 |
| Rail Media Group Limited | Extraterritorial | 2004 |
| Rail NDT Ltd | Professional & scientific | 2019 |
| Rail OCS Ltd | Professional & scientific | 2021 |
| Rail Operations (Assets) Limited | Financial services | 2020 |
| Rail Operations (Freight) Limited | Transport & logistics | 2017 |
| Rail Operations (Passenger) Limited | Transport & logistics | 2017 |
| Rail Operations (Rolling Stock Management) Limited | Transport & logistics | 2017 |
| Rail Operations (UK) Limited | Professional & scientific | 2013 |
| Rail Operations Group Limited | Transport & logistics | 2017 |
| Rail Safety & Systems Assurance Limited | Transport & logistics | 2013 |
| Rail Vehicle Control Systems Ltd. | Professional & scientific | 2012 |
| Railist Engineering Ltd | Professional & scientific | 2018 |
| Railstaff Publications Limited | Information & communication | 1995 |
| Railstaff Select Limited | Information & communication | 1997 |
| Railston & Company Ltd | Professional & scientific | 2013 |
| Railway City Trains Ltd. | Wholesale & retail | 2015 |
| Railway Station Fish Ltd | Hospitality | 2023 |
| Railway Vehicle Preservations Limited | Arts & recreation | 1979 |
| Rainbow Ebenezer Care Ltd | Health & social care | 2016 |
| Rainbow Sparkle Solutions UK Ltd | Administrative & support | 2025 |
| Rainbow Welcome Care Services Ltd | Health & social care | 2024 |
| Raine Technical Consulting Ltd | Professional & scientific | 2025 |
| Rainplusplus Ltd. | Professional & scientific | 2016 |
| Rainworth Developments 2021 Limited | Real estate | 2021 |
| Raise Bars Ltd | Wholesale & retail | 2025 |
| Raising Smiles World Ltd | Wholesale & retail | 2025 |
| Raising the Bar Hospitality Limited | Hospitality | 2026 |
| Raiya Aesthetics Ltd | Health & social care | 2025 |
| Raiya Ltd | Health & social care | 2025 |
| Raiyanest Group Ltd | Financial services | 2025 |
| Raiyanest Properties Ltd | Real estate | 2025 |
| RAJ DI Hatti Ltd | Wholesale & retail | 2022 |
| RAJ Suddhi Limited | Wholesale & retail | 2003 |
| Raja Carz Ltd | Wholesale & retail | 2025 |
| Raja Sahib Construction Ltd | Construction | 2020 |
| Raja Sahib Ltd | Construction | 2024 |
| Raja Stores Ltd | Wholesale & retail | 2025 |
| Rajat Sharma Photography Limited | Professional & scientific | 2025 |
| Rajaujinc Ltd | Administrative & support | 2025 |
| Rajiaujphvd Ltd | Transport & logistics | 2025 |
| Rajinder Athwal Ltd | Transport & logistics | 2025 |
| Rajni Ltd | Hospitality | 2024 |
| Rakkar Property Limited | Real estate | 2025 |
| Rakkar Transport Ltd | Transport & logistics | 2022 |