| Rackham Investments Limited | Wholesale & retail | 1960 |
| Radiant Solutions Limited | Information & communication | 2000 |
| Radical Acceptance Limited | Arts & recreation | 2019 |
| Radicore Software Limited | Information & communication | 2004 |
| Ragnar Ltd | Wholesale & retail | 2020 |
| Rags & Svets Limited | Wholesale & retail | 2002 |
| Raiden Property Limited | Real estate | 2017 |
| RAJ Bangladeshi Restaurant Limited | Hospitality | 2004 |
| Rajeevs Cuisine Ltd | Hospitality | 2016 |
| Raju Consultancy Limited | Real estate | 2004 |
| Rakrin Medics Limited | Other services | 2014 |
| Ralcon Limited | Financial services | 1982 |
| Ralph Hackman Solutions Limited | Information & communication | 2004 |
| Rampart Properties Limited | Construction | 1987 |
| Ramster Events and Consulting Ltd | Professional & scientific | 2002 |
| Rand Pharma Ltd | Health & social care | 2013 |
| Randolph Walk Management Limited | Real estate | 1983 |
| Raner Reinforcements Limited | Manufacturing | 1979 |
| Ranjan Properties Limited | Real estate | 2008 |
| Ransoms (Hook) Limited | Construction | 1934 |
| Ransoms Enterprises Limited | Real estate | 1964 |
| Ransoms(Plant Hire)Co.,Limited | Administrative & support | 1964 |
| RAP Design & Build Ltd | Construction | 2024 |
| Rapidmile Limited | Construction | 1994 |
| Rarebreed Dining Limited | Hospitality | 2014 |
| Rarer Properties Limited | Real estate | 2017 |
| Rarity Properties Limited | Real estate | 2016 |
| Rarver Limited | Professional & scientific | 2012 |
| Rashaj Company Limited | Hospitality | 1999 |
| Raspberry Digital Studio Limited | Arts & recreation | 2005 |
| Ratnam Jewels Ltd | Wholesale & retail | 2007 |
| Ravenwood Developments Limited | Real estate | 2005 |
| Rawling & Sons (Opticians) Limited | Wholesale & retail | 1993 |
| RAY Dudman Associates Limited | Professional & scientific | 1992 |
| RAY Lewis Sports & Leisurewear Limited | Wholesale & retail | 2003 |
| Raymond Foster Letting Company Limited | Wholesale & retail | 1976 |
| Rayn-Tech Limited | Professional & scientific | 1990 |
| Raynes Trading Limited | Wholesale & retail | 2020 |
| Raypark Properties Limited | | 1986 |
| Rays Florist Limited | Wholesale & retail | 2006 |
| RAZ Kebab & Cafe Limited | Hospitality | 2017 |
| Reach Delivery International Limited | Administrative & support | 2002 |
| Ready 2 Drop Limited | Wholesale & retail | 2014 |
| Real Hosts Limited | Information & communication | 2006 |
| Real Runners Ltd | Arts & recreation | 2005 |
| Reallyspecial Ltd. | Wholesale & retail | 2000 |
| Reap Services Ltd | Information & communication | 2013 |
| Reasden Electronics Limited | | 1979 |
| Recall Communications Limited | Administrative & support | 1988 |
| Recognition Awards Limited | Administrative & support | 2007 |
| Red Barns UK Limited | Information & communication | 2006 |
| Red Grape Music Ltd | Information & communication | 2006 |
| Red Lane Cottages Limited | Households | 2018 |
| Red Moon Catering Ltd | Hospitality | 2024 |
| Redgull Data Limited | Information & communication | 1994 |
| Redland Purle (Northern) Limited | | 1949 |
| Redland Roadstone Limited | | 1894 |
| Redleaf Associates Ltd | Professional & scientific | 2002 |
| Redmar Inns Ltd | Hospitality | 2003 |
| Redro Limited | Information & communication | 2004 |
| Redwood Construction (U.K.) Limited | | 1985 |
| Redworth Properties Limited | Real estate | 1961 |
| Reed Accounts Limited | Professional & scientific | 2003 |
| Reem NL Group Ltd | Health & social care | 2026 |
| Rees Design Partnership Limited | Professional & scientific | 1985 |
| Reform Consultancy Services Limited | Professional & scientific | 2002 |
| Refresh Consulting Limited | Professional & scientific | 2000 |
| Refrigair Limited | Construction | 2005 |
| Regulatory Projects Limited | Administrative & support | 2006 |
| Rehman Clinical Consulting Limited | Health & social care | 2025 |
| Reigate Premises Ltd | Extraterritorial | 2019 |
| Reigate Travel Holdings Limited | Administrative & support | 2002 |
| Reigate Travel Limited | Administrative & support | 1972 |
| Relationships Care Community (RCC) Ltd. | Professional & scientific | 2007 |
| Relative Roots Limited | Arts & recreation | 2007 |
| Relaxation Rooms Ltd | Other services | 2003 |
| Releasecycle Solutions Limited | Information & communication | 2016 |
| Relton Inns Limited | Hospitality | 2001 |
| Renaissance Pharma Ltd | Professional & scientific | 2022 |
| Rendlesham Park Estate (Freehold) Limited | Real estate | 2002 |
| Rentrin Properties Ltd | Real estate | 2021 |
| Repaircraft (UK) Limited | Professional & scientific | 2007 |
| Repaircraft PLC | Manufacturing | 1959 |
| Response Surveys Limited | Administrative & support | 2006 |
| Restmore Surveying Ltd | Professional & scientific | 2014 |
| Resultbright Limited | Other services | 1998 |
| Results Marketing & Training Limited | Professional & scientific | 1988 |
| Rethink Print & Marketing Services Limited | Professional & scientific | 2014 |
| Revomark Limited | Professional & scientific | 2005 |
| REX Poolco Limited | Financial services | 2026 |
| Rfid Centre Ltd | Manufacturing | 2003 |
| RHD Research Limited | Arts & recreation | 2003 |
| Rhema Church Ministries Ltd | Extraterritorial | 2011 |
| Rhetorik Global Limited | Information & communication | 2017 |
| Rhetorik Limited | Professional & scientific | 1994 |
| Rhodes Foods Limited | Hospitality | 1970 |
| Rhodes Watkins Limited | Construction | 2005 |
| Rhop Company Limited | Real estate | 2024 |
| RHT Business Advisors Limited | Professional & scientific | 2005 |
| Ribdeal Limited | Wholesale & retail | 1990 |