| Riuk Holdings Ltd | Financial services | 2025 |
| Riuk Investments a Ltd | Real estate | 2025 |
| Rivabelle Ltd | Wholesale & retail | 2021 |
| Rivage Clothing Ltd | Wholesale & retail | 2015 |
| River Carmelle Systems Ltd | Information & communication | 2025 |
| River Gods Limited | Construction | 2014 |
| River Tea Rooms Limited | Hospitality | 2006 |
| River Vale Systems Limited | Information & communication | 2025 |
| River View Heights Limited | Households | 2005 |
| River Wing Saas Ltd | Information & communication | 2025 |
| Riverace Limited | Health & social care | 2015 |
| Riverbay Capital Limited | Real estate | 2021 |
| Riverbend Gate Ltd | Information & communication | 2025 |
| Riverbend Saas Technologies Ltd | Information & communication | 2025 |
| Riverbendartisans Ltd | Wholesale & retail | 2025 |
| Riverbridge Accountants Ltd | Professional & scientific | 2025 |
| Riverbridge Management Ltd | Real estate | 2024 |
| Rivermaiin Limited | Construction | 2025 |
| Riverside Advice Ltd | Other services | 2003 |
| Riverside Holiday Homes Ltd | Hospitality | 2020 |
| Riverside Housing Property Management Ltd | Real estate | 2020 |
| Riverside Launch Ventures Ltd | Financial services | 2026 |
| Riverside Sourdough Limited | Manufacturing | 2015 |
| Riverstone Property Developers Limited | Real estate | 2020 |
| Rivertide Developments Limited | | 1989 |
| Riverwalk Business Park (NO.1) Limited | Real estate | 2006 |
| Riverwalk Business Park (NO.3) Limited | Real estate | 2006 |
| Rivet Recruiters Ltd | Administrative & support | 2018 |
| Rivexa Ltd | Wholesale & retail | 2026 |
| Riviera CAD Ltd | Professional & scientific | 2025 |
| Riviera Cloud Path Ltd | Information & communication | 2025 |
| Rivora Glow Ltd | Wholesale & retail | 2026 |
| Rivtech Fastening Systems Co., Ltd | Extraterritorial | 2021 |
| Riwaaz Ltd | Wholesale & retail | 2025 |
| RIX Bros.Limited | | 1961 |
| Rixos Holdings Limited | Administrative & support | 2007 |
| Rixtolls Limited | Information & communication | 2024 |
| Riyaad Estates Ltd | Real estate | 2018 |
| Riyan Trading Limited | Wholesale & retail | 2024 |
| RIZ Properties Cardiff Limited | Real estate | 2022 |
| RIZ69 Supermarket Ltd | Wholesale & retail | 2020 |
| Rizco International Ltd | Wholesale & retail | 2016 |
| Rizcom Ltd | Wholesale & retail | 2026 |
| Rizecom Ltd | Wholesale & retail | 2026 |
| Rizk Foods Ltd | Hospitality | 2019 |
| Rizqan Cloud Kitchen Ltd | Hospitality | 2026 |
| Rizqdua Horizon Properties Limited | Real estate | 2025 |
| Rizvi Wholesalers Limited | Wholesale & retail | 2025 |
| Rizvy Sadik Ltd | Wholesale & retail | 2024 |
| Rizwa.Group Ltd | Hospitality | 2020 |
| Rizwan Ullah Ltd | Wholesale & retail | 2025 |
| Rizyg Ltd | Wholesale & retail | 2021 |
| RJ Aesthetics Limited | Health & social care | 2024 |
| RJ Heating GAS Ltd | Construction | 2022 |
| RJ Hirani Ltd | Information & communication | 2024 |
| RJ Hospo Ltd | Professional & scientific | 2025 |
| RJ IT Consultancy Limited | Information & communication | 2014 |
| RJ Multimedia Ltd | Information & communication | 2024 |
| RJ Steel Ltd | Construction | 2017 |
| RJ Wellbeing CIC | Health & social care | 2024 |
| RJA Accountancy Limited | Professional & scientific | 2017 |
| Rjas Apps Ltd | Information & communication | 2025 |
| RJB Electrical Associates Limited | Construction | 2017 |
| RJC Entertainment Limited | Real estate | 2018 |
| RJC Surgery Ltd | Health & social care | 2022 |
| RJC Trade Limited | Wholesale & retail | 2011 |
| Rjcc Developments Ltd | Construction | 2022 |
| Rjcc Homes Ltd | Real estate | 2026 |
| Rjcc Properties Ltd | Real estate | 2026 |
| RJD Property Solutions Ltd | Real estate | 2021 |
| RJG Transport Ltd | Transport & logistics | 2016 |
| RJH Consult Ltd | Professional & scientific | 2014 |
| RJM Hair Salon Ltd | Other services | 2017 |
| RJM Opticman Ltd | Professional & scientific | 2026 |
| RJP Global Limited | Professional & scientific | 2014 |
| RJR Bar Services Limited | Hospitality | 2021 |
| RJS Property Holdings Ltd | Real estate | 2024 |
| RJT Catering Limited | Hospitality | 2026 |
| RJW Medical Services Ltd | Health & social care | 2023 |
| RJW Ventures Limited | Financial services | 2023 |
| RK Radiology Services Ltd | Health & social care | 2014 |
| RK Telecome Ltd | Information & communication | 2024 |
| RK19 Ltd | Wholesale & retail | 2024 |
| RKA Cardiff Holdings Limited | Financial services | 2021 |
| RKA Cardiff Holdings One Ltd | Financial services | 2025 |
| RKA Cardiff Investments Holdings Limited | Financial services | 2023 |
| RKA Cardiff Investments Limited | Real estate | 2021 |
| RKA Talent Investment Limited | Administrative & support | 2024 |
| Rkade Limited | Wholesale & retail | 2011 |
| RKB Fitness Ltd | Arts & recreation | 2026 |
| Rkcorp Ltd | Information & communication | 2023 |
| Rkdigital Ltd | Other services | 2025 |
| RKH Consultants Limited | Administrative & support | 2010 |
| RKO MG Ltd | Wholesale & retail | 2025 |
| RKP Property Services Ltd | Real estate | 2017 |
| RKR Landscape & Driveways Ltd | Professional & scientific | 2026 |
| RKS Trading Alliance Ltd | Wholesale & retail | 2023 |
| Rksha Ltd | Health & social care | 2014 |
| RKT Enterprises Limited | Wholesale & retail | 2015 |
| RKT Enterprises Monmouth Ltd | Wholesale & retail | 2022 |