| RCT Furniture Limited | Wholesale & retail | 2005 |
| RD Dragon Limited | Hospitality | 2020 |
| RD Reserves Ltd | Professional & scientific | 2020 |
| RDC PD Ltd | Transport & logistics | 2018 |
| Rdcsafg Mart Ltd | Wholesale & retail | 2025 |
| RDD Limited | Manufacturing | 2000 |
| RDE Financial Advising Services Limited | Financial services | 2026 |
| RDJ Cars Limited | Wholesale & retail | 2025 |
| RDJ Williams Investments Limited | Hospitality | 2014 |
| Rdkpropertyservices Limited | Real estate | 2021 |
| RDM Fire & Security Ltd | Administrative & support | 2026 |
| RDM Fire & Security Systems Ltd | Administrative & support | 2023 |
| RDM Property Services Limited | Real estate | 2025 |
| RDM Wines Limited | Wholesale & retail | 2008 |
| Rdmf Ltd | Professional & scientific | 2016 |
| Rdmpubco Ltd | Hospitality | 2025 |
| RDP Properties (Wales) Limited | Construction | 2007 |
| RDS Transport Ltd | Transport & logistics | 2026 |
| Rduk Ltd | Extraterritorial | 2010 |
| RDW QA Limited | Financial services | 2013 |
| RDW QCA Limited | Financial services | 2022 |
| RE - Create - Cardiff and Vale Play Services Association | Wholesale & retail | 1989 |
| RE Properties Limited | Real estate | 2011 |
| RE Property Developers Ltd | Construction | 2025 |
| RE Tech Group Ltd | Wholesale & retail | 2025 |
| Re-Mortgagemyhouse Ltd | Financial services | 2017 |
| Re:Evolve Consulting Limited | Administrative & support | 2024 |
| Reach Axis Software Limited | Information & communication | 2025 |
| Reach HR Ltd | Administrative & support | 2024 |
| Reach Material Co., Ltd | Wholesale & retail | 2020 |
| Reach OUT Interpretation Services UK (Rois UK) | Administrative & support | 2018 |
| Reach Your Full Potential Limited | Professional & scientific | 2024 |
| Reacher Stanson Limited | Financial services | 2023 |
| Reachic Limited | Wholesale & retail | 2025 |
| React Facilities Management Ltd | Energy | 2019 |
| Reaction Martial Arts Limited | Arts & recreation | 2022 |
| Reaction Nine Limited | Manufacturing | 2019 |
| Reactive Climate Management Group Limited | Administrative & support | 2013 |
| Reactive Medical Ltd | Education | 2025 |
| Reactive Plumbing Care Limited | Construction | 2016 |
| Reactive Rail and Civil Engineering Ltd | Construction | 2025 |
| Read Home Improvement Ltd | Construction | 2025 |
| Readar Limited | Information & communication | 2019 |
| Readiaw Ltd | Information & communication | 2025 |
| Reading City Estates Ltd | Real estate | 2019 |
| Reading Interior Concepts Ltd | Construction | 2012 |
| Ready Guys Ltd | Construction | 2024 |
| Ready Management Limited | Professional & scientific | 2018 |
| Readyrides Ltd | Wholesale & retail | 2022 |
| Real Investment Time Ltd | Information & communication | 2018 |
| Real 60 Property Ltd | Real estate | 2015 |
| Real Art Invest Ltd | Wholesale & retail | 2018 |
| Real Communication and Coaching Ltd | Information & communication | 2018 |
| Real Deal Parts Online Ltd | Wholesale & retail | 2018 |
| Real Estate Deals Limited | Real estate | 2019 |
| Real Estate DXB Ltd | Real estate | 2025 |
| Real Estate Eschbach Limited | Administrative & support | 2010 |
| Real Estate Financial Immo AS Ltd | Professional & scientific | 2018 |
| Real Estate MD Ltd | Real estate | 2025 |
| Real Experience Ltd | Administrative & support | 2026 |
| Real Fibre Limited | Construction | 2021 |
| Real Ingredients Limited | Professional & scientific | 1983 |
| Real Life Choices Health Care Ltd | Health & social care | 2022 |
| Real One Properties Ltd | Real estate | 2024 |
| Real Players Estates Ltd | Real estate | 2025 |
| Real Protection Limited | Administrative & support | 2025 |
| Real Reply Ltd | Information & communication | 2023 |
| Real SFX Group Limited | Financial services | 2019 |
| Real SFX Limited | Information & communication | 2008 |
| Real Signature Factory Ltd | Hospitality | 2025 |
| Real Talk TV Nottingham Community Interest Company | Information & communication | 2020 |
| Real Traders Limited | Wholesale & retail | 2017 |
| Realdesign Ltd. | Administrative & support | 2019 |
| Reale Inns Limited | Hospitality | 2003 |
| Realecom Ltd | Wholesale & retail | 2025 |
| Reality Estate Agents Limited | Real estate | 2009 |
| Reality Realestate Limited | Water & waste | 2024 |
| Reall Ecom Star Limited | Wholesale & retail | 2025 |
| Really Useful Machinery Limited | Information & communication | 2020 |
| Realmultimedia Ltd | Information & communication | 2018 |
| Realsage Ltd | Real estate | 2024 |
| Realscene Ltd | Construction | 2017 |
| Realtex (UK) Ltd | Wholesale & retail | 2019 |
| Realtex Development Ltd | Professional & scientific | 2015 |
| Realtilaunch Consulting Ltd | Professional & scientific | 2023 |
| Realtime Care Solutions PVT Company Ltd | Administrative & support | 2018 |
| Realty Direct Limited | Real estate | 2021 |
| Realvision Ltd | Wholesale & retail | 2025 |
| Realway Global Limited | Transport & logistics | 2026 |
| Reangel Biotechnology Co., Ltd. | Administrative & support | 2019 |
| Reanne Services Limited | Hospitality | 2025 |
| Reansa Medical Services Limited | Health & social care | 2002 |
| Reas Consultants Ltd | Professional & scientific | 2020 |
| Reay Residential Ltd | Real estate | 2017 |
| Reba Consulting Ltd | Construction | 2021 |
| Rebar Reinforcements Limited | Construction | 2018 |
| Rebecca Bland Ltd | Information & communication | 2024 |
| Rebecca Carter Aesthetics Limited | Health & social care | 2012 |
| Rebecca Hmzcd Limited | Wholesale & retail | 2025 |
| Rebecca Knox Casting Ltd | Arts & recreation | 2016 |