| Responsible AI Collective Ltd | Information & communication | 2025 |
| Responsive Security Services Ltd | Administrative & support | 2018 |
| Responsive Technology Ltd | Wholesale & retail | 2019 |
| Ressl Limited | Information & communication | 2017 |
| Rest Assured Residences Ltd | Households | 2025 |
| Rest Bay Café Bar Limited | Hospitality | 2019 |
| Rest Bay Property Company Limited(The) | Real estate | 1960 |
| Restaurant 207 Ltd | Real estate | 2019 |
| Restaurante - Pizzeria Durazzo Ltd | Hospitality | 2013 |
| Restaurarte Ltd | Hospitality | 2023 |
| Restless by Nature Limited | Information & communication | 2013 |
| Resto Classics(Cardiff) Limited | Wholesale & retail | 2022 |
| Resto Consultancy Limited | Professional & scientific | 2022 |
| Restock Resell Limited | Wholesale & retail | 2025 |
| Restoration Chapel Evangelical Ministries | Other services | 2016 |
| Restoration Pathways Community CIC | Education | 2026 |
| Restore Consulting PC | | 2020 |
| Restore Transform Heal CIC | Health & social care | 2025 |
| Restore Wild Ltd | Wholesale & retail | 2024 |
| Restore Yourself Ltd | Professional & scientific | 2024 |
| Restorehousing Ltd | Real estate | 2026 |
| Restoring Number Four Limited | Information & communication | 2024 |
| Resu IT Solutions Ltd | Information & communication | 2012 |
| Resu Metals Ltd | Wholesale & retail | 2022 |
| Resultas Limited | Administrative & support | 2017 |
| Reswappy Limited | Wholesale & retail | 2025 |
| RET Consulting Ltd | Water & waste | 2014 |
| Retail Crazy 1 Ltd | Wholesale & retail | 2026 |
| Retail Crazy Retail Ltd | Wholesale & retail | 2026 |
| Retail Direct Online Limited | Wholesale & retail | 2015 |
| Retail Merchandising Services Ltd | Administrative & support | 2005 |
| Retail River One Ltd | Wholesale & retail | 2024 |
| Retailvio Ltd | Wholesale & retail | 2021 |
| Retermak Consulting Ltd | Professional & scientific | 2023 |
| Retford Court Limited | Households | 1966 |
| Retics & Reptiles Ltd | Wholesale & retail | 2020 |
| Retired to the Beach Limited | Hospitality | 2003 |
| Retive 22 Ltd | Professional & scientific | 2021 |
| Reto's Services Ltd | Health & social care | 2019 |
| Retrapro Group Limited | Professional & scientific | 2025 |
| Retreat Coventry Limited | Other services | 2012 |
| Retro Fitting Ltd | Construction | 2019 |
| Retro Gym Solutions Ltd | Wholesale & retail | 2025 |
| Retro Highres Ltd | Information & communication | 2023 |
| Retro Lounge Ltd | Arts & recreation | 2008 |
| Retro to Go Go Limited | Arts & recreation | 2019 |
| Retro Vault Limited | Wholesale & retail | 2025 |
| Retro Whispers Ltd | Wholesale & retail | 2025 |
| Retro-Juice Films Limited | Information & communication | 2013 |
| Retrofit Survey Specialists Limited | Professional & scientific | 2021 |
| Return of the MAC Ltd | Hospitality | 2018 |
| Reuben Evans Ltd | Real estate | 2012 |
| Reuben Jack Property Ltd | Real estate | 2021 |
| Reuben-Jude Ltd | Professional & scientific | 2012 |
| Reunion Group Holdings Limited | Administrative & support | 2025 |
| REUSE4LIFE Limited | Wholesale & retail | 2021 |
| Reutervard Limited | Wholesale & retail | 2025 |
| Rev-Evo Consulting Ltd | Professional & scientific | 2021 |
| REVA2108 Limited | Construction | 2019 |
| Revalox Ltd | Wholesale & retail | 2025 |
| Revamp Home Improvements NG Ltd | Professional & scientific | 2018 |
| Revealed Business Limited | Professional & scientific | 2017 |
| Revel X Ltd | Professional & scientific | 2023 |
| Revell Estates Ltd | Real estate | 2018 |
| Revelse Ltd | Wholesale & retail | 2026 |
| Revenue for Good Limited | Professional & scientific | 2024 |
| Revenue Systems AI Ltd | Information & communication | 2025 |
| Revenueup Ltd | Professional & scientific | 2025 |
| Revere Logistics Ltd | Administrative & support | 2019 |
| Reverie Holdings Ltd | Financial services | 2018 |
| Reverieco Ltd | Professional & scientific | 2025 |
| Revina Ltd | Wholesale & retail | 2025 |
| Revina Tours UK Limited | Administrative & support | 2025 |
| Revinea Ltd | Wholesale & retail | 2025 |
| Reviprog Ltd | Wholesale & retail | 2025 |
| Reviresco Group Ltd | Hospitality | 2025 |
| Revised Recruitment Group Limited | Education | 2020 |
| Revit Limited | Administrative & support | 2019 |
| Revitacare Limited | Wholesale & retail | 2025 |
| Revival Eagles Apostolic Living Ministries Ltd | Other services | 2011 |
| Revival Floatation Centre Ltd | Health & social care | 2018 |
| Revive Autos Ltd | Other services | 2020 |
| Revive Exterior Solutions Ltd | Manufacturing | 2021 |
| Revive Maintenance Services Ltd | Construction | 2026 |
| Revive Medical Performance Ltd | Health & social care | 2025 |
| Revive Properties (SW) Ltd | Real estate | 2026 |
| Revivecore Ltd | Professional & scientific | 2026 |
| Revlinkers Ltd | Professional & scientific | 2026 |
| Revnix Ltd | Wholesale & retail | 2025 |
| Revoid Ltd | Information & communication | 2025 |
| Revolution Fundraising Limited | Wholesale & retail | 2025 |
| Revolution IT Consultants Ltd | Information & communication | 2013 |
| Revolution Motors Ltd | Wholesale & retail | 2017 |
| Revolutionary Industry's. Ltd | Construction | 2022 |
| Revonova Motors Ltd | Wholesale & retail | 2023 |
| Revops Fractional Ltd | Professional & scientific | 2026 |
| Revwa Ltd | Wholesale & retail | 2025 |
| Revworks GTM Ltd | Professional & scientific | 2025 |
| Rewallet Limited | Information & communication | 2018 |
| Reward Music Limited | Administrative & support | 2000 |