| Responsible Builders Ltd | Construction | 2025 |
| Retailovisibility Limited | Wholesale & retail | 2024 |
| Retro Books Ltd | Wholesale & retail | 2020 |
| Retrofit Eco Ltd | Wholesale & retail | 2024 |
| Retrotechgifts Ltd | Wholesale & retail | 2026 |
| Revalew Consulting Ltd | Professional & scientific | 2025 |
| Revise Roofing Ltd | Construction | 2024 |
| Rewa Traders Limited | Wholesale & retail | 2004 |
| Reyansh Technologies Ltd | Information & communication | 2025 |
| Reyrenovation Ltd | Construction | 2024 |
| Reza Facilites Ltd | Transport & logistics | 2023 |
| RG 1 Investments Limited | Real estate | 2022 |
| RG 2 Consultants Limited | Professional & scientific | 2022 |
| RG Meskill Consultancy Ltd | Other services | 2022 |
| RGM Holdings Limited | Real estate | 2015 |
| RGS Film & Foils Limited | Other services | 2010 |
| RHD Solutions Limited | Information & communication | 2025 |
| Riaans Kitchen Ltd | Hospitality | 2026 |
| Ribroc House Management Limited | Households | 1985 |
| Ricco Estate Limited | Real estate | 2023 |
| Riceinterim Healthcare Management Limited | Administrative & support | 2025 |
| Richan Care (Midlands) Limited | Health & social care | 2023 |
| Richan Properties Limited | Real estate | 2018 |
| Richard Daniels House Management Company Limited | Households | 2008 |
| Richari Holdings Ltd | Real estate | 2026 |
| Rickmansworth Road (Harefield) Management Limited | Households | 1986 |
| Ricky LEE Burrows Ltd | Extraterritorial | 2024 |
| Ricreate Limited | Real estate | 2024 |
| Ridaan and Ruhan UK Ltd | Information & communication | 2012 |
| Ride Luxury Ltd | Transport & logistics | 2026 |
| Rider Jewellery Limited | Wholesale & retail | 2023 |
| Ridgeway Farms Ltd | Agriculture & fishing | 2024 |
| Ridgeway Roadway Ltd | Real estate | 2011 |
| Ridgewell House, Woolwich Management Company Limited | Households | 2025 |
| Riel Estate Limited | Real estate | 2018 |
| Rigel Spices Limited | Wholesale & retail | 2025 |
| Rigg Haulage Limited | Transport & logistics | 2012 |
| Right Care 4 U Ltd | Administrative & support | 2015 |
| Rightchoicescaffolding Limited | Construction | 2013 |
| Rightcoast IT Limited | Information & communication | 2018 |
| Rightmove Investments Limited | Real estate | 2007 |
| Rights Capital Holding Limited | Information & communication | 2024 |
| Rightseal Glazing Limited | Construction | 2026 |
| Righttimefortune Limited | Health & social care | 2014 |
| Righttradesmen Limited | Information & communication | 2008 |
| Rigour Contractors Ltd | Construction | 2022 |
| Rikada Properties Ltd | Real estate | 2020 |
| Rimtrend Limited | Wholesale & retail | 1997 |
| Rimy Limited | Energy | 2022 |
| Ring Property Ltd | Real estate | 2023 |
| Ringan Limited | Professional & scientific | 2017 |
| Rioform Ltd | Construction | 2014 |
| Ripley Close RTM Company Limited | Real estate | 2006 |
| Rippon Boswell & Co. Limited | Professional & scientific | 1993 |
| Rirafield Limited | Households | 2024 |
| Rishabhh Ventures Ltd | Financial services | 2025 |
| Rishans Enterprises Limited | Real estate | 2024 |
| Risheena Limited | Professional & scientific | 2011 |
| Rising Health and Beauty Ltd | Health & social care | 2017 |
| Ritas Chilli Chaat Corner Ltd | Manufacturing | 2020 |
| River Court Ruskin Ltd | Real estate | 2017 |
| River Walk Sunbury Management Limited | Households | 1995 |
| Riverlock (High Wycombe) Management Company Limited | Real estate | 2006 |
| Riversdale (High Wycombe) Management Company Limited | Real estate | 2008 |
| Riverside Ceramics Ltd | Health & social care | 2007 |
| Riverside Fitness House Ltd | Arts & recreation | 2023 |
| Riverstone Trading Ltd | Wholesale & retail | 2025 |
| Riviere Interiors Ltd | Construction | 2019 |
| Rivitan Homes Ltd | Real estate | 2025 |
| Riyaana Fashions UK Ltd | Wholesale & retail | 2023 |
| Rizome Limited | Information & communication | 2025 |
| RJ Harrison Accountancy Ltd | Professional & scientific | 2019 |
| RJ Moto Limited | Wholesale & retail | 2025 |
| RJ Purser Ltd | Construction | 2015 |
| Rjdrg Investments Ltd | Financial services | 2023 |
| Rjdstill Limited | Professional & scientific | 2014 |
| RJM Insulation Limited | Construction | 2014 |
| RJM Renewables Limited | Construction | 2025 |
| RK PI UK 2 Ltd | Real estate | 2025 |
| RK Property Investments UK Ltd | Real estate | 2007 |
| RK Residential Investments UK Limited | Real estate | 2018 |
| Rkeytech Consulting Ltd | Administrative & support | 2025 |
| RKJ Brands Limited | Professional & scientific | 2020 |
| RKP Capital Limited | Real estate | 2025 |
| RKP London Ltd | Wholesale & retail | 2022 |
| RKS Management Ltd | Professional & scientific | 2019 |
| RKS Retailing Ltd | Wholesale & retail | 2025 |
| RKY UK Holdings Ltd | Households | 2025 |
| Rk’S Rentals Limited | Wholesale & retail | 2024 |
| RL Bespoke Joinery Ltd | Construction | 2026 |
| RL Cleaning Ltd | Administrative & support | 2025 |
| RL Electricians Ltd | Construction | 2022 |
| RM Creative Limited | Manufacturing | 2025 |
| RM Management Alliance Limited | Real estate | 2013 |
| RMA Traders Limited | Wholesale & retail | 2019 |
| Rmedeiros Garden Limited | Administrative & support | 2020 |
| RMI Luxury Ltd | Other services | 2026 |
| Rmixia Ltd | Information & communication | 2025 |
| RMP197 Limited | Professional & scientific | 2010 |
| RMT Fruits Limited | Other services | 1984 |