| RJ Property Holdings Ltd | Real estate | 2021 |
| RJ Realty Estates Limited | Real estate | 2019 |
| RJ3 Property Services Limited | Real estate | 2025 |
| RJ3 Services Limited | Health & social care | 2025 |
| RJH Reinforcement Solutions Ltd | Construction | 2013 |
| RK FOX Limited | Real estate | 2025 |
| RK Holmes Limited | Administrative & support | 2009 |
| RKB Rail Services Ltd | Professional & scientific | 2016 |
| RKS Clean Scaffolding Ltd | Construction | 2026 |
| RKS Partners Ltd | Real estate | 2013 |
| RKS UK Holdings Limited | Financial services | 2025 |
| RKS UK Properties Limited | Real estate | 2025 |
| RL Carpet Cleaning Services Ltd | Administrative & support | 2023 |
| RL Educational Consultancy Limited | Education | 2025 |
| Rleka Limited | Construction | 2025 |
| Rlin Limited | Wholesale & retail | 2026 |
| RLS Construction Limited | Construction | 2015 |
| RLV Building Ltd | Construction | 2017 |
| RM Autos Solutions Limited | Wholesale & retail | 2025 |
| RM Builders (Romford) Ltd | Construction | 2011 |
| RM Constructions London Ltd | Construction | 2024 |
| RM Fades Ltd | Other services | 2026 |
| RM Transfer Ltd | Transport & logistics | 2017 |
| RM Windows and Doors Limited | Manufacturing | 2019 |
| RMB Electrical Services Ltd | Construction | 2026 |
| RMB Solutions Ltd | Professional & scientific | 2026 |
| Rmds Finance Ltd | Professional & scientific | 2026 |
| RMH Global Wealth Ltd | Real estate | 2022 |
| RMI Trans Ltd | Transport & logistics | 2024 |
| Rmsz Ltd | Construction | 2020 |
| RN Building Services Ltd | Construction | 2015 |
| RNB Fire Ltd | Public administration | 2019 |
| RNB Security Ltd | Other services | 2017 |
| Rndsa Investments Ltd | Real estate | 2023 |
| RNM Builders Ltd | Financial services | 2025 |
| RNN Properties Ltd | Households | 2024 |
| RNR Designs Ltd | Manufacturing | 2026 |
| RNS Training Centre Ltd | Education | 2021 |
| RNT Mobile Shop Limited | Wholesale & retail | 2024 |
| RO2OL Limited | Construction | 2015 |
| Roab Ltd | Transport & logistics | 2020 |
| Road Ready Driving Instructors Ltd | Education | 2024 |
| Roak Care Ltd | Health & social care | 2023 |
| Roal Limited | Construction | 2019 |
| Robbinn Electrical Limited | Wholesale & retail | 2025 |
| Robbuild Construction Ltd | Construction | 2026 |
| Robert Botezatu Transport Ltd | Transport & logistics | 2019 |
| Roberto Parts Ltd | Wholesale & retail | 2018 |
| Robin Construction Ltd. | Construction | 2014 |
| Robinson & Co UK Limited | Construction | 2025 |
| Robseenz Ltd | Health & social care | 2022 |
| Rock X3 Security Ltd | Administrative & support | 2023 |
| Rockel Shipping Company Limited | Transport & logistics | 2009 |
| Rocky Global Services Ltd | Other services | 2022 |
| Rockyfella Ltd | Arts & recreation | 2025 |
| Rodera Ltd | Construction | 2024 |
| Roflorea Ltd | Manufacturing | 2020 |
| Rojber Ltd | Other services | 2022 |
| Rokristal Ltd | Transport & logistics | 2019 |
| Roku Sports UK Ltd | Manufacturing | 2020 |
| Rolat Properties Ltd | Real estate | 2021 |
| Rolats Services UK Limited | Transport & logistics | 2007 |
| Rolling Solutions Ltd | Construction | 2025 |
| ROLO7FIXING Ltd | Administrative & support | 2019 |
| Roman JOB Ltd | Construction | 2017 |
| Romec Care Limited | Health & social care | 2020 |
| Romeo and Halide Ltd | Construction | 2015 |
| Romford Car & Van Rental Ltd | Administrative & support | 2018 |
| Romford Catering Equipment Ltd | Manufacturing | 2025 |
| Romtrans International Ltd | Transport & logistics | 2019 |
| Ronkus Care Limited | Health & social care | 2016 |
| Rontol Limited | Real estate | 2019 |
| Rony's Ltd | Administrative & support | 2020 |
| Roohi ZIA Limited | Health & social care | 2020 |
| Rookwise Ltd | Information & communication | 2026 |
| Root + Bloom Limited | Manufacturing | 2026 |
| Rootedwords Ltd | Administrative & support | 2025 |
| ROS Solutions Ltd | Hospitality | 2025 |
| Rosaform Ltd | Health & social care | 2026 |
| Rose Estates and Developments Ltd | Hospitality | 2024 |
| ROSECARE24/7 Limited | Health & social care | 2023 |
| Rosen Drylinings Ltd | Construction | 2025 |
| Roses N Roses Ltd | Wholesale & retail | 2025 |
| Rosewood Southend Limited | Real estate | 2022 |
| Roshtech Solutions Ltd | Information & communication | 2003 |
| Roswib International Limited | Construction | 2022 |
| Rotech Systems Limited | Mining & quarrying | 2018 |
| Rowland & Co Safety Limited | Construction | 2016 |
| Rowney Road Limited | Real estate | 2024 |
| Roxx Sports Ltd | Wholesale & retail | 2022 |
| Royal Flush Plumbing Limited | Construction | 2024 |
| Royal Oak Court (Dagenham) Management Limited | Administrative & support | 2001 |
| Royale Cement UK Ltd | Construction | 2025 |
| Royale Lahore Limited | Hospitality | 2023 |
| Royale Sports League Ltd | Arts & recreation | 2025 |
| Royance Security Ltd | Administrative & support | 2025 |
| Royaume Business & Project Management Services Limited | Professional & scientific | 2008 |
| Rozana Fresh Foods Company Ltd | Wholesale & retail | 2019 |
| RP Impex Limited | Wholesale & retail | 2026 |
| Rpfireprotect Ltd | Construction | 2026 |