| Rasch (U.K.) Limited | Wholesale & retail | 1987 |
| Rashan Pani UK Limited | Wholesale & retail | 2020 |
| Rashman Ltd | Hospitality | 2025 |
| Rasotan Health and Beauty Limited | Other services | 2025 |
| Rasp Compliancy Ltd | Professional & scientific | 2025 |
| Rass Assets Ltd | Real estate | 2021 |
| Raswella Business and Career Transition Coach and Consultant Ltd | Education | 2018 |
| Rathbone Management Consultancy Ltd | Administrative & support | 2025 |
| Rathgar Care Home Ltd | Other services | 2016 |
| Rathore Consultancy Limited | Professional & scientific | 2019 |
| Rational Endeavour Ltd. | Education | 2024 |
| Ratty-Mk Limited | Wholesale & retail | 2024 |
| Raul Serv Ltd | Transport & logistics | 2018 |
| Ravalue Services Ltd | Professional & scientific | 2014 |
| Ravensden Consulting Ltd | Real estate | 2021 |
| Ravensden Holdings Limited | Financial services | 2013 |
| Ravv Consulting Ltd | Information & communication | 2019 |
| Ravv Properties Limited | Financial services | 2023 |
| RAW Collection Ltd | Wholesale & retail | 2024 |
| RAW Corporate Health Limited | Arts & recreation | 2001 |
| RAW Deal Limited | Other services | 2017 |
| RAW Fire Ltd | Manufacturing | 2025 |
| RAW FITN3Z Ltd | Information & communication | 2026 |
| RAW Sports Management Limited | Arts & recreation | 2016 |
| Rawace Developments (London) Ltd | Real estate | 2025 |
| Rawvita Limited | Wholesale & retail | 2025 |
| RAX Ginny Ltd | Wholesale & retail | 2023 |
| RAY Accountancy Limited | Professional & scientific | 2014 |
| RAY Accountants Limited | Extraterritorial | 2015 |
| RAY Borley Dunkley LLP | | 2010 |
| RAY KAY Engineering Limited | Professional & scientific | 2016 |
| Rayan’S Rentals Ltd | Administrative & support | 2024 |
| Rayaru Group Holdings Ltd | Financial services | 2026 |
| Rayes Medical Ltd | Health & social care | 2025 |
| Rayes Ventures Limited | Wholesale & retail | 2020 |
| Rayfem Limited | Information & communication | 2010 |
| Raymen and Co Electrical Ltd | Construction | 2008 |
| Raymodaw Services Limited | Mining & quarrying | 2014 |
| Raymond Yeates Project Management Ltd | Construction | 2026 |
| Rayton Civil Engineering Limited | Construction | 2024 |
| Rayton Construction Limited | Construction | 2025 |
| Rayton Group Limited | Financial services | 2024 |
| Rayton Plant Hire Limited | Construction | 2024 |
| Rayton Recruitment Limited | Construction | 2024 |
| Raza Educational Limited | Education | 2020 |
| Raza Property Ltd | Real estate | 2021 |
| RB Farriery Ltd | Agriculture & fishing | 2024 |
| RB Homes & Interiors Limited | Manufacturing | 2023 |
| RB Liquid Art Limited | Arts & recreation | 2022 |
| RB Property Solutions (MK) Ltd | Real estate | 2023 |
| RB Taxsolutions Ltd | Professional & scientific | 2023 |
| RB Tyres Ltd | Wholesale & retail | 2019 |
| Rbdm Limited | Manufacturing | 2007 |
| RBG Community Services CIC | Other services | 2019 |
| RBS Construct Ltd | Construction | 2017 |
| RC Advisory Group Limited | Professional & scientific | 2020 |
| RC Assignments Limited | Professional & scientific | 2024 |
| RC Park Bar Ltd | Hospitality | 2026 |
| RC Park Cafe Ltd | Hospitality | 2026 |
| RC Park Functions Ltd | Hospitality | 2025 |
| RC Park Sports Ltd | Arts & recreation | 2026 |
| RC Property Group Limited | Real estate | 2026 |
| RC Resonance Ltd | Wholesale & retail | 2026 |
| RC Student Holdings Limited | Households | 2018 |
| RC Student Housing 1 Limited | Households | 2018 |
| RC Trans Ltd | Transport & logistics | 2024 |
| RC Wivelsfield LLP | | 2019 |
| RCA Renovations Ltd | Construction | 2024 |
| Rcbm Solutions Ltd | Information & communication | 2018 |
| RCG Associates Limited | Information & communication | 2012 |
| RCL Urban Developments and Holdings Ltd | Construction | 2026 |
| RCL Urban Developments Ltd | Construction | 2025 |
| RCM IT Services Limited | Information & communication | 2019 |
| RCM Partitions Limited | Construction | 2018 |
| Rcor Technologies Limited | Information & communication | 2025 |
| RCP Hospitality Group Ltd | Professional & scientific | 2025 |
| RCP London Ltd | Hospitality | 2025 |
| RCS Construct Ltd | Construction | 2019 |
| RCY Consultancy Ltd | Professional & scientific | 2021 |
| RD Anzen Ltd | Administrative & support | 2014 |
| RD Services MK Limited | Construction | 2010 |
| RDC Connect Electrical Limited | Construction | 2023 |
| RDC Electrical Services Limited | Construction | 2018 |
| RDD Consulting Ltd | Professional & scientific | 2026 |
| RDK Mediatech Ltd | Information & communication | 2024 |
| RDM Carpentry Limited | Construction | 2011 |
| RDM Tech Services Limited | Information & communication | 2009 |
| Rdos Services Ltd | Transport & logistics | 2023 |
| Rdpl Consultants Limited | Manufacturing | 2016 |
| RDS Building Services Ltd | Construction | 2019 |
| RDW Composites Ltd | Professional & scientific | 2025 |
| RDY Trans Limited | Transport & logistics | 2026 |
| RE Bourse Limited | Construction | 2020 |
| RE USE Community Project CIC | Wholesale & retail | 2013 |
| RE-CO2GNITION Ltd | Construction | 2024 |
| Re-Decs MK Limited | Construction | 2019 |
| Re-Mark-It Limited | Wholesale & retail | 2018 |
| Re:Esg Limited | Administrative & support | 2025 |
| Reaching OUT Limited | Information & communication | 1995 |
| Reachout Integrated Solutions Limited | Administrative & support | 2017 |