| Rufta Haulage Ltd | Transport & logistics | 2026 |
| Rugby League Solutions Limited | Professional & scientific | 2023 |
| Rugby League World Tours Ltd | Professional & scientific | 2023 |
| Rugbytots South Manchester Limited | Education | 2022 |
| Ruglenza Ltd | Wholesale & retail | 2025 |
| Rugratz Ltd | Arts & recreation | 2023 |
| Rugs & More Company Limited | Wholesale & retail | 2023 |
| Rukhshussain Ltd. | Professional & scientific | 2016 |
| Rullion Homes Limited | Construction | 2017 |
| Rumbles Cafe Limited | Hospitality | 2025 |
| Rumbles Pizza Leeds Limited | Hospitality | 2022 |
| Rumbles Pizzeria Ltd | Hospitality | 2025 |
| Rumford Tankers Limited | Transport & logistics | 1991 |
| Rumi Hub Ltd | Wholesale & retail | 2026 |
| Rumi Realms Ltd | Real estate | 2025 |
| Rumsey Digital Limited | Professional & scientific | 2023 |
| Run CMD Ltd | Extraterritorial | 2022 |
| Run for ALL Limited | Arts & recreation | 2006 |
| Run for ALL Trading Limited | Arts & recreation | 2023 |
| Run the Gauntlet | Administrative & support | 2025 |
| Run the Streets Ltd | Information & communication | 2022 |
| Rune Films Ltd | Information & communication | 2026 |
| Runestone Supply Ltd | Wholesale & retail | 2025 |
| Rungfar Limited | Extraterritorial | 1987 |
| Runnerz Ltd | Transport & logistics | 2024 |
| Running Shoes Ltd | Wholesale & retail | 2012 |
| Running Wild Ltd | Other services | 2014 |
| Running Wild Travel Limited | Administrative & support | 2023 |
| Runox Technologies Limited | Information & communication | 2026 |
| Runsen Innovations Limited | Wholesale & retail | 2024 |
| Runswick Properties Limited | Real estate | 2001 |
| Runway Construction Ltd | Construction | 2019 |
| Runway Rides Ltd | Transport & logistics | 2025 |
| Runwithliss Ltd | Professional & scientific | 2026 |
| Rupert Pupkin Limited | Real estate | 2020 |
| Rupyal Restaurant Ltd | Hospitality | 2017 |
| Rural & Urban Design Group Limited | Financial services | 2026 |
| Rural Construction Limited | Construction | 2007 |
| Rural HD8 Limited | Real estate | 2011 |
| Rural Offices LLP | | 2018 |
| Rurigu Ltd | Health & social care | 2014 |
| Ruroc Limited | Manufacturing | 2010 |
| Rusel Caley Flooring Limited | Construction | 2013 |
| Rush Breaks Ltd | Wholesale & retail | 2025 |
| Rush Property Lettings Ltd | Real estate | 2024 |
| Rushforth Engineering Limited | Manufacturing | 2012 |
| Rushpay Payments Ltd | Information & communication | 2020 |
| Rushpool Investments Limited | Real estate | 2023 |
| Rushton Asset Holdings Limited | Real estate | 2023 |
| Rushwood Management Services Ltd | Construction | 2016 |
| Russell Financial Consultancy Services Limited | Professional & scientific | 2015 |
| Russell People Ltd | Administrative & support | 2018 |
| Russell PM Services Ltd | Professional & scientific | 2024 |
| Russell Robert Accountants Ltd | Professional & scientific | 2023 |
| Russell Stone Holdings Limited | Financial services | 2025 |
| Russell Trades Ltd | Construction | 2023 |
| Russell Ulyatt Financial Services Limited | Financial services | 1974 |
| Russell Ulyatt Group Limited | Financial services | 2017 |
| Russell Ulyatt Holdings Limited | Extraterritorial | 2006 |
| Rust Guard AC Ltd | Information & communication | 2025 |
| Rustic & Co Salon Ltd | Other services | 2025 |
| Rustless Iron Co.Limited(The) | Manufacturing | 1919 |
| Rusty Lion Limited | Real estate | 2019 |
| Rusu a Trans Ltd | Transport & logistics | 2019 |
| Ruswil Consulting Ltd | Professional & scientific | 2024 |
| Ruth Brady (Harewood) Limited | Health & social care | 2014 |
| Ruth Osborn Limited | Other services | 2021 |
| Ruther Cross Limited | Information & communication | 2011 |
| Rutherford and Wheeler Ltd | Arts & recreation | 2020 |
| Rutherford and Wheeler Partnership LLP | | 2025 |
| Rutherford Bremen Investments | Financial services | 2022 |
| Rutland Drive Management Limited | Households | 2003 |
| Rutland Plastering Ltd | Construction | 2016 |
| Rutter Consulting Group Limited | Professional & scientific | 2012 |
| Ruvah Laboratories Ltd | Manufacturing | 2020 |
| Ruya Supermarket Ltd | Wholesale & retail | 2026 |
| Ruzac Real Estate Limited | Real estate | 2015 |
| RV Powell Holdings Ltd | Financial services | 2025 |
| RV Property Investments (Morley) Limited | Real estate | 2022 |
| RVG Ltd | Health & social care | 2018 |
| Rvit Ltd. | Information & communication | 2019 |
| Rvneonex Limited | Information & communication | 2026 |
| Rvps Consulting Ltd. | Professional & scientific | 2021 |
| Rvtc Ltd | Wholesale & retail | 2026 |
| RW Operations Ltd | Administrative & support | 2023 |
| RW Roofing & Building Ltd | Construction | 2025 |
| RWG (Diagnostics) Limited | Professional & scientific | 2009 |
| RWG Research Limited | Professional & scientific | 2009 |
| RWS Nominees Limited | Professional & scientific | 2020 |
| Rwu-Art Ltd | Arts & recreation | 2015 |
| RX Plus Ltd | Wholesale & retail | 2024 |
| Rxpharma Ltd | Health & social care | 2025 |
| RY Fairfax Ltd | Wholesale & retail | 2026 |
| Ryan & Sons Property Ltd | Households | 2024 |
| Ryan Anthony Properties Limited | Real estate | 2019 |
| Ryan Bownes Installation Ltd | Information & communication | 2019 |
| Ryan Carmody Physiotherapy and Sports Injury Clinic Limited | Health & social care | 2026 |
| Ryan Holden Ltd | Construction | 2024 |
| Ryan Props Ltd | Real estate | 2017 |
| Ryan Scott Electrical Limited | Manufacturing | 2025 |