| Rizai's London Ltd | Real estate | 2024 |
| Rizons International Limited | Information & communication | 2025 |
| Rizq (UK) Limited | Real estate | 2005 |
| RJ Protects Security Ltd | Administrative & support | 2026 |
| RJ Training Limited | Administrative & support | 2024 |
| RK Recycle and Waste Management Limited | Water & waste | 2024 |
| RK Sons Limited | Real estate | 2017 |
| Rksk Homes Ltd | Hospitality | 2025 |
| RM Blocks Ltd | Real estate | 2025 |
| Rmbe Ltd | Real estate | 2018 |
| RMK Motor & Repair Centre Ltd | Wholesale & retail | 2018 |
| RMS Associates Limited | Professional & scientific | 2021 |
| RMS Employment Ltd | Administrative & support | 2019 |
| RN Powder Coating Limited | Manufacturing | 2026 |
| RNB Ventures Ltd | Wholesale & retail | 2025 |
| RNK Care Limited | Health & social care | 2021 |
| RNS Global Consultants Limited | Education | 2025 |
| RNS Prime Services Ltd | Construction | 2025 |
| RNS Solutions Limited | Administrative & support | 2025 |
| RO Consult Ltd | Administrative & support | 2016 |
| RO Consulting Limited | Professional & scientific | 2014 |
| RO Consulting Services Ltd | Administrative & support | 2020 |
| RO Invest Ltd | Real estate | 2022 |
| RO Umbrella Ltd | Administrative & support | 2017 |
| Road Lynx Transport Limited | Transport & logistics | 2026 |
| Roadlink Haulage Ltd | Transport & logistics | 2025 |
| Robert Motors Limited | Wholesale & retail | 2023 |
| Robindom Ltd | Construction | 2014 |
| Robsam Solutions Ltd | Hospitality | 2018 |
| Roby Services Ltd | Transport & logistics | 2017 |
| ROC IT Solutions Ltd | Information & communication | 2008 |
| ROC Security Solutions Ltd | Administrative & support | 2013 |
| Rock Furniture Limited | Wholesale & retail | 2021 |
| Rockel Limited | Professional & scientific | 2005 |
| Rockstar Estate Limited | Real estate | 2022 |
| Rohan Enterprise London Ltd | Wholesale & retail | 2021 |
| Rojalpark Express Ltd | Wholesale & retail | 2022 |
| Rokafela Ltd | Construction | 2022 |
| Rollmoor Limited | | 1981 |
| Rollot Ltd | Hospitality | 2017 |
| Rolvantis Ltd | Information & communication | 2025 |
| Rom-Construct Limited | Construction | 2008 |
| Roman & LU Limited | Water & waste | 2019 |
| Romanian Products Cash&Carry Limited | Wholesale & retail | 2020 |
| Romano Group Ltd | Construction | 2016 |
| Romanoff Ltd | Administrative & support | 2022 |
| Romas Construction Ltd | Other services | 2021 |
| Romb Research Ltd | Manufacturing | 2021 |
| Romclean Limited | Administrative & support | 2013 |
| Rommel Capital Ltd | Real estate | 2025 |
| Rondale Caribbean Cuisine Limited | Hospitality | 2020 |
| Roof Top Construction Designs Limited | Professional & scientific | 2023 |
| Rooff Construction Ltd | Construction | 2021 |
| Rooff Holdings Limited | Financial services | 2019 |
| Rooff Ltd | Construction | 1976 |
| Rooff Residential Ltd. | Construction | 1966 |
| Roofmate Exteriors Ltd | Construction | 2023 |
| Roofs & on Ltd | Real estate | 2023 |
| Roofson Ltd | Construction | 2018 |
| Roopra Global Limited | Real estate | 2026 |
| Rooted Logistics Ltd | Transport & logistics | 2025 |
| Rootz General Trading Ltd | Wholesale & retail | 2025 |
| Rosartus Ltd | Information & communication | 2021 |
| Rose KA Construction Ltd | Construction | 2024 |
| Rose Logistics Ltd | Professional & scientific | 2026 |
| Rosegate QA Consulting Ltd | Information & communication | 2013 |
| Rosegold Estates Limited | Real estate | 2016 |
| Rosewood Integration Centre Community Interest Company | Public administration | 2025 |
| Ross Build Ltd | Construction | 2026 |
| Ross Mckinley Accountants Limited | Professional & scientific | 2012 |
| Roveta Ltd | Professional & scientific | 2012 |
| Rowplc Holdings Ltd | Administrative & support | 2023 |
| ROY Pharma Limited | Wholesale & retail | 2015 |
| ROY Properties & Management Limited | Hospitality | 2024 |
| Royaal Signs and Awnings Limited | Manufacturing | 2015 |
| Royrose Estate Ltd | Real estate | 2024 |
| Rozafa Shkoder Ltd | Transport & logistics | 2025 |
| Rozin Real Estates Ltd | Real estate | 2025 |
| RQ5 Ltd | Wholesale & retail | 2021 |
| RR Global Solutions Limited | Hospitality | 2018 |
| RR Solutions BD Ltd | Professional & scientific | 2026 |
| RRK Btec College Limited | Education | 2026 |
| Rroinvestments Limited | Real estate | 2022 |
| RS Beauty Enterprise Ltd | Wholesale & retail | 2021 |
| RS Constructions London Ltd | Construction | 2023 |
| RS Investments Holdco Limited | Real estate | 2023 |
| RS.M1 Ltd | Manufacturing | 2026 |
| RSG Electrics Ltd | Construction | 2018 |
| Rshair Extensions Ltd | Other services | 2024 |
| Rshairuk Ltd | Other services | 2021 |
| RSK Property and Services Limited | Real estate | 2023 |
| RSL Management Ltd | Real estate | 2020 |
| RSM Hospitality Limited | Administrative & support | 2015 |
| RSR Essex Properties Ltd | Extraterritorial | 2024 |
| Rssa 2 Group Ltd | Hospitality | 2023 |
| Rssa Group Limited | Real estate | 2022 |
| RT Property Ventures Limited | Real estate | 2021 |
| Rubix London Limited | Professional & scientific | 2015 |
| Rubylife Care Ltd | Professional & scientific | 2022 |
| Ruchithaa Software Solutions Limited | Information & communication | 2012 |