| Rrab Investments Ltd | Real estate | 2020 |
| RRG Lettings Ltd | Real estate | 2023 |
| Rrgm Limited | Financial services | 2024 |
| RRK Group Investments Limited | Real estate | 2024 |
| RROBINS4PROPERTY Ltd | Real estate | 2025 |
| RRP Constructions Ltd | Construction | 2021 |
| RRS Medical Ltd | Health & social care | 2021 |
| RS & L Limited | Real estate | 2010 |
| RS Design and Build Limited | Construction | 2011 |
| RS Kitchens Design Studio Ltd | Wholesale & retail | 2020 |
| RS Nexus Group Limited | Financial services | 2026 |
| RS Response Trustees Limited | Real estate | 2020 |
| RS Services Ltd | Manufacturing | 2023 |
| RS Signature Foods Ltd | Hospitality | 2026 |
| RSA Financial Solutions Ltd | Professional & scientific | 2014 |
| RSA Surgical Centre Limited | Health & social care | 2020 |
| RSB Surveys Limited | Construction | 2016 |
| RSF Seller Ltd | Wholesale & retail | 2024 |
| RSH Concerts Limited | Arts & recreation | 2025 |
| RSH7 Consulting Ltd | Administrative & support | 2025 |
| Rsmd Ltd | Information & communication | 2014 |
| Rsnit Consultancy Ltd | Information & communication | 2019 |
| RSO Recruitment Ltd | Administrative & support | 2026 |
| Rsoft-Tech Ltd | Information & communication | 2022 |
| RSP Daisy Bidco Limited | Financial services | 2025 |
| RSP Daisy Midco Limited | Financial services | 2025 |
| RSP Holdco Limited | Financial services | 2024 |
| RSP Snowdrop Bidco Limited | Financial services | 2026 |
| RSP Snowdrop Holdco Limited | Financial services | 2026 |
| Rsps London Limited | Real estate | 2014 |
| RSR Commercial Limited | Real estate | 2021 |
| RSR Prestige Properties Ltd | Real estate | 2026 |
| RSR Residential Solutions Limited | Construction | 2017 |
| RSS Tech Limited | Information & communication | 2008 |
| RST Telecom Ltd | Construction | 2025 |
| Rstyling Limited | Other services | 2018 |
| RT & Sons Property Ltd | Real estate | 2025 |
| RT Mach Ltd | Wholesale & retail | 2024 |
| Rtcs Limited | Professional & scientific | 1999 |
| Rtfix Ltd | Manufacturing | 2023 |
| RTL of Portsmouth Limited | Transport & logistics | 2016 |
| RTP Trading Ltd | Real estate | 2026 |
| RTS Financial Planning Limited | Financial services | 2017 |
| RTS MAT Ltd | Professional & scientific | 2024 |
| Rtsm Properties Ltd | Real estate | 2025 |
| RTT3 Ltd | Information & communication | 2022 |
| RTZ Services Limited | Transport & logistics | 2017 |
| RTZ UK Direct Ltd | Transport & logistics | 2017 |
| Ruach MK Limited | Wholesale & retail | 2019 |
| Ruben Developments Limited | Real estate | 2026 |
| Rubi Murray Ltd | Real estate | 2022 |
| Rubi Properties Ltd | Real estate | 2022 |
| Rubicon Drinks Limited | Manufacturing | 1981 |
| Rubicon UK Holdings Limited | Wholesale & retail | 2022 |
| Rubik Digital Ltd | Information & communication | 2010 |
| Rubix Software Ltd | Administrative & support | 2016 |
| Ruby Digital Ltd | Professional & scientific | 2025 |
| Ruby Logistics Ltd | Transport & logistics | 2024 |
| Ruby's Glow Tanning Limited | Other services | 2025 |
| Rudd Design Ltd | Professional & scientific | 2023 |
| Rudeva Services Ltd | Information & communication | 2022 |
| Rudgeway Construction Ltd | Construction | 2018 |
| Rudhra Info Solutions Limited | Information & communication | 2022 |
| Rudhran Limited | Real estate | 2021 |
| Rudradev Technologies Limited | Information & communication | 2025 |
| Rudragna Ltd | Wholesale & retail | 2021 |
| Rudram Foods Limited | Wholesale & retail | 2025 |
| Ruen Thai Spa Ltd | Other services | 2019 |
| Ruff Barkinson Ltd | Other services | 2026 |
| Ruff Cutz Linford Wood Ltd | Other services | 2024 |
| Ruff Edge Sharpening Services Ltd | Administrative & support | 2023 |
| Ruffcutz MK Ltd | Other services | 2019 |
| Rufuski Limited | Health & social care | 2021 |
| Rugby Apparel Merchandising UK Ltd. | Wholesale & retail | 2012 |
| RUI Feng Chen Ltd. | Wholesale & retail | 2025 |
| RUI Painting and Decorating Ltd | Construction | 2025 |
| RUI Pereira Services Ltd | Information & communication | 2024 |
| Rukeeeyz Creative Studios Limited | Professional & scientific | 2025 |
| Rukhiya's Cakes Ltd | Manufacturing | 2018 |
| Rukhmini Technologies Limited | Information & communication | 2008 |
| Rula Ltd | Professional & scientific | 2022 |
| Rullet Healthcare Ltd | Health & social care | 2025 |
| Rullet Services Ltd | Real estate | 2023 |
| Rumah Consultancy Services Ltd | Financial services | 2021 |
| Rumi Beaution Limited | Wholesale & retail | 2024 |
| Rumi Essentials Ltd | Wholesale & retail | 2024 |
| Rumiri Properties Ltd | Real estate | 2019 |
| Run QI Cultural Media Ltd | Wholesale & retail | 2025 |
| Runad Medico-Legal Services Ltd | Professional & scientific | 2016 |
| Runak Ltd | Real estate | 2025 |
| Runners Base Ltd | Arts & recreation | 2015 |
| Running Heads Music Limited | Information & communication | 2024 |
| Runz Solution Ltd | Information & communication | 2022 |
| Rupam Purohit Ltd | Administrative & support | 2017 |
| Ruperts Landscapes Limited | Administrative & support | 2019 |
| Rupingazi Smiles Ltd | Health & social care | 2022 |
| Rural and Urban Strategic Limited | Real estate | 2022 |
| RUS Dumitru JUS Ltd | Construction | 2023 |
| Ruscounting Limited | Professional & scientific | 2013 |
| Rush Haulage Ltd | Transport & logistics | 2019 |