| Renz Supplies Ltd | Wholesale & retail | 2021 |
| Reodeco Energy International Ltd | Construction | 2024 |
| Repairfast Ltd | Construction | 2004 |
| Repeak Ltd | Wholesale & retail | 2020 |
| Reprohouse Limited | Manufacturing | 1999 |
| Reptile Discovery Ltd | Wholesale & retail | 2022 |
| Republic Limited | Extraterritorial | 2008 |
| Repulse UK Ltd | Administrative & support | 2023 |
| Rerr Ltd | Health & social care | 2021 |
| RES Solutions Limited | Real estate | 2025 |
| Research & Development Advisors UK Ltd | Professional & scientific | 2021 |
| Research and Development Consulting Limited | Professional & scientific | 2012 |
| Reset Your Cache Ltd | Information & communication | 2025 |
| Resicum Limited | Professional & scientific | 2017 |
| Residencepro Limited | Construction | 2023 |
| Resign Driveways 4 U Ltd | Administrative & support | 2023 |
| Resolute Marketing Group Ltd | Administrative & support | 2024 |
| Resolution Rentals Ltd | Real estate | 2022 |
| Resolved Claims Limited | Professional & scientific | 2009 |
| Resonance Group Limited | Real estate | 2022 |
| Resource Weaver (UK) Limited | Information & communication | 2011 |
| Respond Electrical Ltd. | Construction | 2017 |
| Respond Services Limited | Other services | 2000 |
| Restora Property Holidings Ltd | Real estate | 2025 |
| Restoration Claims Direct Limited | Construction | 2026 |
| Restore Collectivism CIC | Hospitality | 2024 |
| Restyle Design Ltd | Construction | 2010 |
| Resurgam Therapy Limited | Health & social care | 2025 |
| Retail Automotive Alliance Limited | Other services | 2004 |
| Retail Stores Services Limited | Wholesale & retail | 2017 |
| Retreat Rituals Limited | Health & social care | 2026 |
| Retrodrivestudio Ltd | Other services | 2020 |
| Reuben T Investments Limited | Real estate | 2017 |
| Review My LOO Ltd | Information & communication | 2024 |
| Revilo Sports Limited | Wholesale & retail | 2015 |
| Revint Limited | Wholesale & retail | 2024 |
| Revive Hypnotherapy Ltd | Other services | 2019 |
| Revive Landscaping Ltd | Administrative & support | 2024 |
| Revived Network Ltd | Information & communication | 2025 |
| Revivelle Ltd | Education | 2023 |
| Revline Motors Ltd | Wholesale & retail | 2024 |
| Revolution Electric & Engineering Ltd | Wholesale & retail | 2020 |
| Revvon Ltd | Construction | 2026 |
| Rework Homes Ltd | Professional & scientific | 2026 |
| Rewplus Limited | Real estate | 2002 |
| REX Factor Limited | Information & communication | 2016 |
| Rexomedia Graphic Design & Software Ltd | Wholesale & retail | 2020 |
| REY Cleaning Services Ltd | Administrative & support | 2025 |
| Reya Enterprises Limited | Health & social care | 2014 |
| Reyland Johnson Mapp (Sawbridgeworth) Limited | Real estate | 2021 |
| Reyland Johnson Mapp Limited | Real estate | 2014 |
| Reynolds Retail Limited | Wholesale & retail | 2020 |
| RF 1214 Limited | Health & social care | 2020 |
| RFE Properties Limited | Real estate | 2017 |
| Rfhm Ltd | Real estate | 2020 |
| RGM Hvac Ltd | Construction | 2024 |
| RGP Solutions Limited | Manufacturing | 1995 |
| Rhino Hire Limited | Administrative & support | 2010 |
| Rhinofish Digital Ltd | Information & communication | 2022 |
| RHK EPM Solutions Ltd | Information & communication | 2025 |
| Rhombi Holdings Limited | Professional & scientific | 2011 |
| Rhombus Solutions Ltd | Information & communication | 2018 |
| Rhwellnessltd Ltd | Arts & recreation | 2026 |
| Rhyvex Ltd | Information & communication | 2022 |
| RI Pro Cleaning Ltd | Administrative & support | 2024 |
| RI Student Accommodation Limited | Hospitality | 2021 |
| Richard Awbery Limited | Real estate | 2005 |
| Richard H. Williams Limited | Financial services | 2017 |
| Richard Improvement Services Limited | Construction | 2019 |
| Richard Pond Ltd | Professional & scientific | 2016 |
| Richard Saunders Ltd | Financial services | 2025 |
| Richard Speakman Farms Limited | Extraterritorial | 2012 |
| Richard Tufnell Limited | Extraterritorial | 2021 |
| Richfair Roofing and Facades Limited | Construction | 2024 |
| Richside Limited | Wholesale & retail | 1981 |
| Richten Ltd | Health & social care | 2022 |
| Richwell Partners Limited | Professional & scientific | 2014 |
| Richychip Gaming Ltd | Wholesale & retail | 2019 |
| Rickard Luckin Financial Services (F&A) Limited | Professional & scientific | 2016 |
| Rickard Luckin Financial Services (OWM) Holdings Limited | Financial services | 2025 |
| Rickard Luckin Financial Services (OWM) Limited | Financial services | 2016 |
| Rickard Luckin Financial Services Limited | Financial services | 2015 |
| Rickard Luckin Limited | Professional & scientific | 2015 |
| Rickard Luckin Statutory Services Limited | Professional & scientific | 1987 |
| Rickshaw (Mayland) Limited | Hospitality | 2025 |
| Ricky Rooms 2 Limited | Real estate | 2021 |
| Ricky Rooms Lettings Ltd | Real estate | 2025 |
| Ricky Rooms Limited | Real estate | 2017 |
| Ridanshe Flat Management Company Limited | Households | 1978 |
| Ridne UK Ltd | Wholesale & retail | 2025 |
| Riemannzeta Limited | Professional & scientific | 2026 |
| Riga Enterprises Limited | Real estate | 2023 |
| Right Balance Accountants and Business Consultants Limited | Professional & scientific | 2025 |
| Right Car Move Limited | Wholesale & retail | 2008 |
| Right Global Associates Limited | Administrative & support | 2020 |
| Right Group Limited | Information & communication | 2025 |
| Right Motors Limited | Wholesale & retail | 2023 |
| Rightpet Ltd | Wholesale & retail | 2023 |
| Rights and Issues Investment Trust Public Limited Company | Financial services | 1962 |
| Rightway Building Solutions Limited | Construction | 2019 |