| Recovery Inc Ltd | Health & social care | 2023 |
| Red Amber Green (Holdings) Limited | Professional & scientific | 2006 |
| Red Armour Ltd | Information & communication | 2002 |
| Red Exports Ltd | Construction | 2022 |
| Redrip Solutions Ltd | Information & communication | 2026 |
| Redrose Construction (Herts) Ltd | Construction | 2024 |
| Reeray Management Services Ltd | Administrative & support | 2012 |
| Refeasy Limited | Professional & scientific | 2016 |
| Reference Audio Ltd | Wholesale & retail | 2021 |
| Reflex Elite Ltd | Construction | 2021 |
| Reform Collective Group Ltd. | Wholesale & retail | 2024 |
| Regency Removals Ltd | Transport & logistics | 2025 |
| Relativity Investment Ltd | Real estate | 2020 |
| Reliance Biotech Consultancy Ltd | Professional & scientific | 2022 |
| Relocate Educate Ltd | Education | 2021 |
| Remote Tech Work Ltd | Information & communication | 2024 |
| Reniani Limited | Wholesale & retail | 2024 |
| Repairs Plus Limited | Other services | 2013 |
| Rephos Ltd | Information & communication | 2018 |
| Reshape IT Limited | Information & communication | 2017 |
| Reskammel Property Company Limited | Real estate | 2021 |
| Resolute Software Limited | Information & communication | 2018 |
| Resolve Accountancy Ltd | Professional & scientific | 2015 |
| Resolve Accountancy Services Limited | Professional & scientific | 2001 |
| Resolve Corporate Ltd | Professional & scientific | 2014 |
| Restored Ladskay Ltd | Professional & scientific | 2010 |
| Restorit Ventures International Company Ltd | Wholesale & retail | 2021 |
| Revilorellim Ltd | Real estate | 2020 |
| Revington Limited | Real estate | 1997 |
| Revivall | Other services | 2003 |
| Reyhankara Limited | Wholesale & retail | 2025 |
| Reznation Limited | Professional & scientific | 2025 |
| RF Barbering Ltd | Other services | 2025 |
| RG Carpentry Ltd | Construction | 2018 |
| RG Leisure Group Limited | Other services | 2023 |
| RH Facades & Interiors Ltd | Construction | 2020 |
| RHM Lettings Limited | Real estate | 2017 |
| Ribbex (UK) Holdings Limited | Financial services | 2019 |
| Ribbex (UK) Limited | Water & waste | 1984 |
| Rice Lane Estates Ltd | Real estate | 2018 |
| Richard Adams Group Ltd | Information & communication | 2009 |
| Richard Jenkins Ltd | Professional & scientific | 2011 |
| Rick Clark's Site Surveys Ltd | Professional & scientific | 2015 |
| Ridge Farm Developments Ltd | Real estate | 2025 |
| Ridge Hill Homes (Long Road Cambridge) Ltd | Construction | 2019 |
| Rilta Limited | Hospitality | 2025 |
| Rinnahville Limited | Information & communication | 2013 |
| Rise 365 Fitness Fuel Limited | Other services | 2023 |
| Rise Health & Fitness Limited | Other services | 2024 |
| Rising Education and Wellbeing Ltd | Education | 2026 |
| Ritchie Security Services Ltd | Administrative & support | 2025 |
| Rivoxa AI Limited | Wholesale & retail | 2026 |
| RJ Business Solutions Ltd | Professional & scientific | 2020 |
| RJ Developments London Ltd Ltd | Real estate | 2023 |
| RJK Creative Ltd | Information & communication | 2025 |
| RJK Groundworks Limited | Construction | 2020 |
| RJK Plant Ltd | Administrative & support | 2022 |
| RJM Aviation Ltd | Manufacturing | 2025 |
| Rmlg Wood Art Ltd | Construction | 2025 |
| RMM Nursery Holdings Limited | Financial services | 2015 |
| Road to Resurgence Ltd | Information & communication | 2024 |
| Roadmaster Concrete Mixers Europe Limited | Manufacturing | 2010 |
| Robertchris Ltd | Transport & logistics | 2022 |
| Robust Developments & Acquisitions Ltd | Real estate | 2018 |
| Rocafella Services Limited | Construction | 2018 |
| Roche Healthcare Trustee Limited | Administrative & support | 2016 |
| Roche Products Limited | Wholesale & retail | 1908 |
| Roche Registration Limited | Professional & scientific | 1995 |
| Rogers-Overy Design Ltd | Arts & recreation | 2017 |
| Romfords Direct Ltd | Wholesale & retail | 2024 |
| Ronin Fitness Ltd | Arts & recreation | 2020 |
| Ronmani Properties Ltd | Real estate | 2024 |
| Ronovax Ltd | Construction | 2025 |
| Roots to Roam Ltd | Information & communication | 2026 |
| Rosewood Banquet Catering Limited | Hospitality | 2025 |
| Rosewood Montessori Nursery Limited | Education | 2000 |
| Rouge Group Ltd | Manufacturing | 2012 |
| Royale Essance Ltd | Manufacturing | 2015 |
| Royan & Partners Ltd. | Construction | 2025 |
| Rozeegold Private Limited | Health & social care | 2014 |
| RP Design & Build Ltd | Construction | 2018 |
| Rpios Limited | Construction | 2020 |
| RSA (Holdings) Ltd | Administrative & support | 2011 |
| RSA Chicago Limited | Administrative & support | 2018 |
| RSA Consulting Limited | Administrative & support | 1984 |
| RSA Interims Limited | Administrative & support | 2013 |
| Rsbmartialarts Ltd | Education | 2025 |
| RSM 2000 Limited | Information & communication | 1999 |
| RTL Supply Limited | Administrative & support | 2019 |
| RTP Management & Events Limited | Professional & scientific | 2022 |
| Rubber Road Ltd | Information & communication | 2012 |
| Ruddick Contractors Ltd | Construction | 2017 |
| RUG Empire Ltd | Real estate | 2018 |
| RVR Private Limited | Construction | 2021 |
| RWT Consultancy Ltd | Administrative & support | 2018 |
| S & R (Southern) Limited | Professional & scientific | 1997 |
| S & R London Drylining Ltd | Construction | 2025 |
| S F Boiler Maintenance Service Ltd | Professional & scientific | 2017 |
| S Roberts Architects Ltd | Professional & scientific | 2021 |
| S&R (Southern) EOT Limited | Administrative & support | 2020 |