| RT Scenery Ltd. | Manufacturing | 2014 |
| RT Wellbeing Ltd | Wholesale & retail | 2023 |
| RTB Estates Blackpool Ltd | Real estate | 2005 |
| RTB Liverpool Ltd | Arts & recreation | 2026 |
| RTB Property Group Ltd | Construction | 2016 |
| RTC Projects Ltd | Hospitality | 2024 |
| RTF Consultancy Ltd | Professional & scientific | 2026 |
| RTF United Service Limited | Information & communication | 2023 |
| RTK Partner Ltd | Construction | 2015 |
| RTL Real Limited | Transport & logistics | 2016 |
| RTM Holdings Ltd | Real estate | 2025 |
| RTP Engineering Limited | Administrative & support | 2010 |
| RTR 25 Limited | Wholesale & retail | 2025 |
| Rtriibe (East Midlands) Ltd | Administrative & support | 2020 |
| Rtriibe Ltd | Administrative & support | 2019 |
| RTS Europe Ltd | Wholesale & retail | 2018 |
| RTS Performance Ltd | Wholesale & retail | 2024 |
| Rtsportsconsultancy Ltd | Professional & scientific | 2017 |
| Rtts Travel Ltd | Transport & logistics | 2022 |
| RUA Care Limited | Public administration | 2020 |
| Ruah Catering Ltd | Hospitality | 2024 |
| Rubardy Ltd | Financial services | 2014 |
| Rubatsiro Limited | Health & social care | 2023 |
| Rubells Limited | Hospitality | 2024 |
| Rubicon Coffee Point Ltd | Wholesale & retail | 2014 |
| Rubilston Ltd | Wholesale & retail | 2022 |
| Rubinu Ltd | Transport & logistics | 2019 |
| Ruby Debt Solutions Ltd | Financial services | 2019 |
| Ruby Food Ltd | Hospitality | 2020 |
| Ruby Lily Crystals Limited | Other services | 2025 |
| Ruby Nails Walton Ltd | Other services | 2022 |
| Rubymine Ltd | Arts & recreation | 2026 |
| Rudd Management Consultants Ltd | Information & communication | 2013 |
| Rudra Impex Limited | Other services | 2020 |
| Ruen Thai Massage Limited | Other services | 2014 |
| Rufford Road Management Company Limited | Real estate | 2007 |
| Rufo Productions Ltd | Information & communication | 2019 |
| Rugby Refunds Limited | Professional & scientific | 2018 |
| Rugged 4X4 Ltd | Wholesale & retail | 2020 |
| Rugged and Mobile Ltd | Information & communication | 2008 |
| Rugged Guide 4X4.COM Limited | Wholesale & retail | 2016 |
| Ruhee Estates Ltd | Real estate | 2026 |
| Ruji Group Ltd | Wholesale & retail | 2021 |
| RUK Pro Ltd | Other services | 2014 |
| Ruknw Limited | Professional & scientific | 2024 |
| Rule 10 Digital Ltd | Information & communication | 2021 |
| Rule AI Limited | Information & communication | 2026 |
| Rule of Three Arts Ltd | Arts & recreation | 2018 |
| Ruler Analytics Limited | Information & communication | 2015 |
| RUM Town Ltd | Wholesale & retail | 2021 |
| Ruma Estates Ltd | Real estate | 2026 |
| Rumbarber Ltd | Other services | 2014 |
| Rumble Electrics Ltd | Construction | 2026 |
| Rumford Court (North West) Limited | Extraterritorial | 1993 |
| Rumford Maritime Limited | Transport & logistics | 2022 |
| Rumsby Healthcare Consultancy Ltd | Health & social care | 2018 |
| Run a Mocha (Liverpool) Ltd | Arts & recreation | 2009 |
| Runaway Bay (Holdings) Ltd | Financial services | 2023 |
| Runaway Dubai Limited | Wholesale & retail | 2023 |
| Runbiz Limited | Professional & scientific | 2019 |
| Runcorn Glass & Bending Co Limited | Manufacturing | 2008 |
| Runcorn Hydroponics Ltd | Other services | 2010 |
| Runcorn Recycling Scrap Metal Limited | Water & waste | 2012 |
| Rundum Meir (UK) Limited | Wholesale & retail | 2000 |
| Runfibre Ltd | Construction | 2020 |
| Runfluence Limited | Administrative & support | 2025 |
| Running Paws Maghull Ltd | Arts & recreation | 2026 |
| Rupert Property Ltd | Construction | 2025 |
| Rupes Holdings Ltd | Construction | 2024 |
| Ruru Cosmetics Ltd | Wholesale & retail | 2023 |
| Rusa Investments PTE Ltd | Real estate | 2024 |
| Rusestar Limited | Wholesale & retail | 1980 |
| Rush HEY Consultancy Ltd | Administrative & support | 2023 |
| Rushie 9 Ltd | Administrative & support | 2022 |
| Rushton Clay Developments Limited | Construction | 2010 |
| Rushton Properties Limited | Real estate | 1998 |
| Rushworths Ltd | Manufacturing | 2021 |
| Rushworths Property Development Ltd | Real estate | 2022 |
| Russell & Bailey Construction Limited | Construction | 2018 |
| Russell Academics Ltd | Education | 2023 |
| Russell and Company (Accountants) Limited | Professional & scientific | 2014 |
| Russell Property Rentals Ltd | Real estate | 2024 |
| Russell R Limited | Professional & scientific | 2025 |
| Russell Transport Limited | Transport & logistics | 2011 |
| Russell's at the Pavilion Limited | Hospitality | 2022 |
| Russmaster Ltd | Administrative & support | 2011 |
| Rust G Media Ltd | Information & communication | 2025 |
| Rust Media Limited | Professional & scientific | 2019 |
| Rusty Nail Limited | Extraterritorial | 2025 |
| Ruth Bousso Limited | Information & communication | 2022 |
| Rutherfords Cheshire Limited | Wholesale & retail | 2019 |
| Rutherfords Luxury Products Limited | Wholesale & retail | 2025 |
| Ruthless Talent Ltd | Professional & scientific | 2023 |
| Ruths Treasures Ltd | Wholesale & retail | 2018 |
| Ruthvik Chandra Properties Ltd | Real estate | 2024 |
| Rutland Commercial Limited | Real estate | 2021 |
| Rutland NW Ltd | Real estate | 2025 |
| Rutland Rendering Specialists Limited | Construction | 2013 |
| Ruusunen IT Ltd | Information & communication | 2026 |
| Ruvi Designs Ltd | Arts & recreation | 2024 |