| Radu Estate Limited | Real estate | 2024 |
| Radu Interiors Ltd | Construction | 2009 |
| Radu Investco Limited | Other services | 2024 |
| Radudotcom Limited | Information & communication | 2024 |
| RAF Refurb Ltd | Construction | 2020 |
| Ragen SF Ltd | Information & communication | 2022 |
| Rahman Brothers Holdings Ltd | Financial services | 2026 |
| Rahman Brothers Restaurants Ltd | Hospitality | 2026 |
| Rahul Properties Limited | Real estate | 2026 |
| RAJ Bhandar Limited | Hospitality | 2015 |
| Rajalakshmi Magesan Ltd | Wholesale & retail | 2025 |
| Rajh Services Ltd | Wholesale & retail | 2024 |
| RAM Power Limited | Manufacturing | 2013 |
| Ramsco Properties Ltd | Real estate | 2024 |
| Rana KAM Ltd | Hospitality | 2024 |
| Ranci Endo Property Services Ltd | Real estate | 2016 |
| Randall Property Holdings Limited | Real estate | 2023 |
| Randle Autos Limited | Wholesale & retail | 2016 |
| Rangamati Limited | Hospitality | 2025 |
| Ranger Group of Companies Ltd | Administrative & support | 2025 |
| RAP Mechanical Services Limited | Professional & scientific | 2016 |
| Rasoi Limited | Hospitality | 2023 |
| Ratne Group Ltd | Real estate | 2026 |
| Raucent UK Limited | Hospitality | 2020 |
| Ravenjet Limited | Extraterritorial | 1997 |
| Ravexo Ltd | Wholesale & retail | 2026 |
| Ravinia Limited | Hospitality | 2025 |
| RAY Cars Sales Ltd | Wholesale & retail | 2024 |
| Rayney Homes Limited | Construction | 2011 |
| Razors Barber Group Ltd | Other services | 2023 |
| Razzi Educational Services Ltd. | Education | 2013 |
| RB & MW Properties Ltd | Real estate | 2017 |
| RBB Consulting Services Ltd | Professional & scientific | 2020 |
| RBJ Accounting Services Limited | Professional & scientific | 2002 |
| Rcbo Electrics Ltd | Manufacturing | 2022 |
| RCC Building Services Ltd | Construction | 2017 |
| Rccg Hope House | Other services | 2019 |
| RCF Commodities Trading Co. (UK) Limited | Mining & quarrying | 2022 |
| RCI Audit and Assurance Services Limited | Professional & scientific | 2006 |
| RCI Future Limited | Financial services | 2020 |
| RCI Luton Limited | Professional & scientific | 2012 |
| RD Electrical Solutions Ltd | Construction | 2016 |
| RDA Financial Planning Limited | Financial services | 2013 |
| RDB Heating-Cooling Services Ltd | Construction | 2016 |
| Rdtruck Ltd | Administrative & support | 2020 |
| RE Work Associates Ltd | Professional & scientific | 2023 |
| Realign Health Ltd | Health & social care | 2023 |
| Realogist Limited | Real estate | 2020 |
| Realtime Journey Ltd | Transport & logistics | 2026 |
| Reavive Limited | Manufacturing | 2026 |
| Rebecca ANN Aesthetics Ltd | Other services | 2023 |
| Rebel Vision Digital Ltd | Professional & scientific | 2024 |
| Recovery Pablo 24/7 Ltd | Transport & logistics | 2024 |
| Rectory Drive Limited | Households | 2009 |
| Recycling Commodities Ltd | Wholesale & retail | 2018 |
| Red Bridge Loans Limited | Financial services | 2019 |
| Red Content Limited | Other services | 2013 |
| Red Herts Ltd | Hospitality | 2024 |
| Red Rated Limited | Hospitality | 2023 |
| Red SHU Limited | Extraterritorial | 2017 |
| Red Stella Ltd | Wholesale & retail | 2014 |
| Red X Limited | Wholesale & retail | 2007 |
| Redak Ltd | Transport & logistics | 2015 |
| Redbox Talent Partners Limited | Information & communication | 2020 |
| Redbridge Assets 2 Limited | Real estate | 2023 |
| Redbridge Assets 3 Limited | Real estate | 2024 |
| Redbridge Assets 4 Limited | Real estate | 2025 |
| Redbridge Assets Limited | Real estate | 2021 |
| Redfern Drywall Limited | Construction | 2022 |
| Redline Trans Limited | Transport & logistics | 2024 |
| Reelcare Limited | Administrative & support | 2006 |
| Reformed Gardening Ltd | Households | 2018 |
| REG Transfers Holdings Limited | Wholesale & retail | 2017 |
| REG Transfers Limited | Financial services | 2019 |
| REG247 Dunstable Ltd | Wholesale & retail | 2026 |
| REG247 Ltd | Wholesale & retail | 2023 |
| Regal Contractors Limited | Construction | 2017 |
| Regal Couriers Ltd | Transport & logistics | 2018 |
| Regal Developments Group Limited | Real estate | 2018 |
| Regal Eco Maintenance Group Ltd | Administrative & support | 2024 |
| Regal Installations Limited | Construction | 2003 |
| Regalstaycleaning Ltd | Administrative & support | 2021 |
| Regent Motors (Dunstable) Ltd | Wholesale & retail | 2012 |
| Regis Electrical Distribution Limited | Wholesale & retail | 2009 |
| Regis Electrical Supplies Limited | Wholesale & retail | 2012 |
| Regis Electrical Wholesale Limited | Wholesale & retail | 2012 |
| Regis Gymnastics Club Ltd | Arts & recreation | 2025 |
| Regis Supplies Ltd | Wholesale & retail | 2011 |
| Registration Transfers Holdings Limited | Financial services | 2026 |
| Regplatewarehouse Limited | Manufacturing | 2020 |
| Rehoboth Heights Ltd | Health & social care | 2025 |
| Reigate Hill Limited | Health & social care | 2009 |
| Reim Intelligence Ltd | Professional & scientific | 2021 |
| Rejuvenate Therapy Limited | Health & social care | 2019 |
| Relabb Limited | Real estate | 2021 |
| Reliable Appliance Repairs Limited | Other services | 2018 |
| Reliable Home Services Limited | Wholesale & retail | 2026 |
| Reliable Law Services Ltd | Professional & scientific | 2012 |
| Reliant Removals Ltd | Transport & logistics | 2025 |
| Relish Health Holdings Limited | Financial services | 2025 |