| Rush Residential Ltd | Real estate | 2017 |
| Rushden Investments 1 Ltd | Real estate | 2025 |
| Rushfield Holidays Limited | Real estate | 2024 |
| Rushify Ltd | Wholesale & retail | 2025 |
| Rushouter Limited | Hospitality | 1986 |
| Ruskaa Limited | Wholesale & retail | 2018 |
| Russ Claridge Building Services Limited | Construction | 2019 |
| Russ Developments Limited | Construction | 2016 |
| Russ J Site Support Ltd | Construction | 2018 |
| Russell & Co Property Development Ltd | Construction | 2019 |
| Russell & Co. Services Limited | Professional & scientific | 2017 |
| Russell & Hanson Limited | Administrative & support | 2012 |
| Russell Bromley Limited | Extraterritorial | 2026 |
| Russell Fullalove Property (Investments) Limited | Real estate | 2018 |
| Russell Jones Kitchens Ltd | Wholesale & retail | 2008 |
| Russell Regal Ltd | Administrative & support | 2016 |
| Russia Bela Agricultural Technology Co., Ltd | Manufacturing | 2023 |
| Russia Sovinick Chemical Co., Ltd | Manufacturing | 2023 |
| Russo&Co Ltd | Wholesale & retail | 2022 |
| Russtour Limited | Transport & logistics | 2013 |
| Rust Publishing Ltd | Professional & scientific | 2017 |
| Rustic Table Ltd | Manufacturing | 2019 |
| Rustico Restaurant Ltd | Hospitality | 2017 |
| Rusticpetals Ltd | Wholesale & retail | 2025 |
| Rustys Plant Engineer Limited | Manufacturing | 2018 |
| Ruth Bills Consulting Ltd | Professional & scientific | 2015 |
| Ruth DAN Ltd | Health & social care | 2018 |
| Ruth Mitchell Homeopathy Limited | Health & social care | 2025 |
| Ruthin Ltd | Professional & scientific | 2017 |
| Rutoru Ltd | Professional & scientific | 2019 |
| Ruttley Property Group Ltd | Real estate | 2025 |
| Ruwash Consultants Limited | Administrative & support | 2015 |
| Ruya London Limited | Other services | 2017 |
| Ruzaffargarh Management Ltd | Households | 2017 |
| RV Calvo Ltd | Information & communication | 2025 |
| RVK Designs Limited | Wholesale & retail | 2018 |
| Rvrl UK Limited | Professional & scientific | 2014 |
| RVS Assets Limited | Arts & recreation | 2026 |
| RWB Actuarial Consulting Limited | Administrative & support | 2010 |
| RWB Improvement Consulting Ltd | Professional & scientific | 2016 |
| RWB Wealth Ltd | Professional & scientific | 2019 |
| RWC Glass Products Ltd | Construction | 2013 |
| RWC Lifts Limited | Manufacturing | 2019 |
| Rwcs Productions Ltd | Information & communication | 2023 |
| RWE Engineering Services Limited | Professional & scientific | 2022 |
| Rwelsh Properties Ltd | Real estate | 2021 |
| RWH Brown Ltd | Health & social care | 2021 |
| RWJ Property Solutions Ltd | Real estate | 2011 |
| RWL Transport Limited | Transport & logistics | 2017 |
| RWM Estates Sales & Lettings Ltd | Real estate | 2018 |
| RWR Recruitment Ltd | Professional & scientific | 2018 |
| RX Pharma Solutions Ltd | Professional & scientific | 2023 |
| RX Virtual Finance Ltd | Professional & scientific | 2024 |
| RY Brothers Ltd | Real estate | 2024 |
| RYA Galcha Ltd | Wholesale & retail | 2023 |
| Ryan and Swainston Food Ventures Limited | Hospitality | 2025 |
| Ryan Burgin Ltd | Other services | 2020 |
| Ryan Immigration Ltd | Professional & scientific | 2015 |
| Ryan IT Services Limited | | 2014 |
| Ryan Landscaping (Holdings) Limited | Financial services | 2024 |
| Ryan Leigh Design Ltd | Information & communication | 2017 |
| Ryan Plant OP Solutions Limited | Professional & scientific | 2014 |
| Ryan Property Limited | Real estate | 1995 |
| Ryan Whittles Ltd | Other services | 2020 |
| Ryaner Co., Ltd | Wholesale & retail | 2021 |
| Ryans Autocare Limited | Administrative & support | 2017 |
| Ryans Rentals Ltd | Administrative & support | 2014 |
| Ryatt Halai Ltd | Real estate | 2025 |
| Rycold Capital Investments Ltd | Hospitality | 2019 |
| Rycon Homes Limited | Construction | 2002 |
| Rycon Victoria Mews Ltd | Real estate | 2016 |
| Rydal Community Gym CIC | Health & social care | 2016 |
| Rydal Developments Limited | | 1989 |
| Ryder Executive Travel Ltd | Transport & logistics | 2016 |
| Ryefield Road Management Company Limited | Professional & scientific | 2003 |
| Ryel Projects Limited | Information & communication | 2019 |
| Ryerson Ltd | Information & communication | 2017 |
| Ryffe Ltd | Wholesale & retail | 2025 |
| Ryhab Capital Ltd | Professional & scientific | 2025 |
| Rykco Foods Ltd | Hospitality | 2017 |
| Ryma Building Ltd | Construction | 2024 |
| Rymer Vehicles Ltd | Transport & logistics | 2021 |
| Rynaty Services Ltd | Other services | 2019 |
| Ryocca Limited | Mining & quarrying | 2023 |
| Rysen Precision Printing Ltd | Manufacturing | 2025 |
| Ryude Trading Limited | Wholesale & retail | 2023 |
| Ryzen Heat Ltd | Construction | 2024 |
| Rzsd Limited | Information & communication | 2025 |
| R\West Advertising Co., Ltd. | Professional & scientific | 2025 |
| Rørservice 24 Limited | Extraterritorial | 2025 |
| S & a Properties (South Wales) Ltd | Wholesale & retail | 2005 |
| S & B (Residents) Management Limited | Households | 1989 |
| S & D Jennings Plumbing & Carpentry Ltd | Manufacturing | 2025 |
| S & J Quality Services Limited | Professional & scientific | 2016 |
| S & JJ Foods Ltd | Hospitality | 2025 |
| S & L V Weston Limited | Arts & recreation | 2006 |
| S & M Decorating Supplies Limited | Wholesale & retail | 2011 |
| S & P Cosmetics Limited | Wholesale & retail | 2015 |
| S & R Estates (Cardiff) Limited | Construction | 2008 |
| S & S Brothers Ltd | Real estate | 2020 |