| Ravikanthi Limited | Information & communication | 2017 |
| Ravinder Kaur Properties Limited | Real estate | 2024 |
| Rawled Consulting Limited | Professional & scientific | 2019 |
| Rawtund Limited | Professional & scientific | 2021 |
| Raybar Limited | Wholesale & retail | 1988 |
| RB RG Properties Ltd | Real estate | 2021 |
| Rbak Group PVT Ltd | Wholesale & retail | 2026 |
| Rbitc Ltd | Arts & recreation | 2024 |
| Rbullion Ltd | Wholesale & retail | 2025 |
| Rc-Transport Limited | Transport & logistics | 2025 |
| RCH Consulting Limited | Professional & scientific | 2005 |
| RD Assets Ltd | Construction | 2012 |
| RD Design and Build Ltd. | Construction | 2020 |
| RDB Pest Control Ltd | Administrative & support | 2025 |
| React Diamond Drillers Limited | Construction | 2023 |
| Real Homes Properties Ltd | Real estate | 2024 |
| Real Online Training & Nutrition Limited | Health & social care | 2020 |
| Real Padel Academy Ltd | Arts & recreation | 2025 |
| Real Property Futures Limited | Real estate | 2019 |
| Real World Impact Ltd | Professional & scientific | 2024 |
| Reassureline Ltd | Administrative & support | 2025 |
| Rebecca Chapman Design LLP | | 2012 |
| Rebecca Clancy English Textiles Ltd | Manufacturing | 2020 |
| Rebecca Nuttall Rnld Limited | Professional & scientific | 2023 |
| Recalibr Ltd | Information & communication | 2023 |
| Recovery Rugby Ltd | Transport & logistics | 2023 |
| Recruitment and Payroll Services Limited | Professional & scientific | 2023 |
| Recycled in Ardleigh Limited | Water & waste | 2009 |
| Red Brick Architecture Limited | Professional & scientific | 2015 |
| Red House Machinery Services Limited | Administrative & support | 1975 |
| Red Panda Rents Limited | Real estate | 2021 |
| Red Sofa London Limited | Administrative & support | 2009 |
| Red Sofa Ltd | Administrative & support | 2020 |
| Redbacks Cushioning Ltd | Manufacturing | 2011 |
| Redhead Technical Services Limited | Construction | 2011 |
| Redhouse Barn Events Ltd | Real estate | 2026 |
| Redi-Lift Holdings Ltd | Financial services | 2023 |
| Redi-Lift Learning Limited | Education | 2024 |
| Redline Presentation Solutions Ltd | Information & communication | 2007 |
| Redplace Limited | Real estate | 1982 |
| Redrock Construction Limited | Construction | 2018 |
| Redsun Digital Ltd | Information & communication | 2023 |
| Redwin Limited | Professional & scientific | 2026 |
| Redwood Accountants (Rugby) Ltd | Professional & scientific | 2017 |
| Redwood Facilities Management Limited | Other services | 2023 |
| Redwood Trees and Landscapes Limited | Administrative & support | 2008 |
| Reece Kenney Ltd | Information & communication | 2019 |
| Reeds Plumbing & Heating Contractors Limited | Construction | 2002 |
| Reeds Property Limited | Real estate | 2020 |
| Reeve Technical Solutions Ltd | Professional & scientific | 2025 |
| Reference Ghar Ltd | Real estate | 2024 |
| Reflection Funeralcare Ltd | Other services | 2023 |
| Reflective Development Limited | Professional & scientific | 2011 |
| Reframe Journals Ltd | Information & communication | 2024 |
| Regalia & Pearl Limited | Information & communication | 2014 |
| Regalia & Pearl Property Limited | Real estate | 2018 |
| Regency Estates (Europe) Limited | Real estate | 2002 |
| Regency Rental Properties Limited | Real estate | 2021 |
| Regent Corner Ltd | Wholesale & retail | 2025 |
| Regent Daily Ltd | Wholesale & retail | 2026 |
| Regent Gate Developments Limited | Construction | 2019 |
| Reid & Sons Ltd | Real estate | 2023 |
| Reidh Limited | Wholesale & retail | 2026 |
| Reign and Shine Play Cafe Ltd | Hospitality | 2025 |
| REIGNITE2 Limited | Real estate | 2023 |
| Reinventing Home Limited | Construction | 2024 |
| REJUVEN8 Physiotherapy Limited | Extraterritorial | 2015 |
| Relaxing VR Ltd | Information & communication | 2024 |
| Relda Estates Ltd | Real estate | 2019 |
| Reliable Customs Limited | Transport & logistics | 2019 |
| Reliable Home Care Ltd | Health & social care | 2023 |
| Relief Care Services Limited | Health & social care | 2022 |
| Religare UK Ltd | Professional & scientific | 1998 |
| Remi Trans Ltd | Transport & logistics | 2023 |
| Removal & Storage Solutions London Limited | Professional & scientific | 2012 |
| Removal Masters Limited | Transport & logistics | 2014 |
| Removal Solutions Rugby Limited | Professional & scientific | 2009 |
| Renatus Beauty Limited | Other services | 2018 |
| Rendercolour Limited | Construction | 2016 |
| Renhal Ltd | Manufacturing | 2014 |
| Renny Delight Ltd | Information & communication | 2020 |
| Renzow Ltd | Real estate | 2024 |
| Repguardian Ltd | Wholesale & retail | 2025 |
| Repolyx Ltd | Manufacturing | 2026 |
| Report Zero Ltd | Professional & scientific | 2024 |
| RES Engineering Services Ltd | Wholesale & retail | 2019 |
| Research Design House Limited | Professional & scientific | 2025 |
| Resonant Thinking Ltd | Professional & scientific | 2022 |
| Resources for Courses Ltd | Education | 2025 |
| Responsive Software Ltd | Information & communication | 2019 |
| Restaurant Thai Ltd | Hospitality | 2026 |
| Resultsmark Ltd | Information & communication | 2009 |
| Resurfacing Excellence (UK) Ltd | Construction | 2021 |
| Revealing Science Limited | Information & communication | 2002 |
| Revel Funeral Care Ltd | Other services | 2020 |
| Revel Healthcare Services Limited | Health & social care | 2011 |
| Revelations Care Agency Limited | Health & social care | 2020 |
| Reviva Homes Ltd | Construction | 2025 |
| Revive! Auto Innovations (High Wycombe) Limited | Wholesale & retail | 2008 |
| Revive! Auto Innovations (Northampton) Limited | Wholesale & retail | 2010 |