| Respectful Bloom Ltd | Wholesale & retail | 2025 |
| Responsible Safety Solutions Ltd | Administrative & support | 2011 |
| Restcare Limited | Administrative & support | 2020 |
| Retford Road 32 Limited | Real estate | 2022 |
| Rethink Consultancy Limited | Information & communication | 2011 |
| Revera Care Limited | Health & social care | 2025 |
| Reverberate Performing Arts LLP | | 2022 |
| Revertex Limited | Professional & scientific | 1966 |
| Review Interiors Limited | Construction | 2010 |
| Revine Healthcare Limited | Administrative & support | 2016 |
| Revolutionise Ltd. | Professional & scientific | 2013 |
| Revontuli Global Limited | Construction | 2025 |
| Rexa Ltd | Wholesale & retail | 2019 |
| Rexgate Ltd | Real estate | 2022 |
| Rexhep Ahmati Electrical Limited | Energy | 2017 |
| Reynolds Capital Group Ltd | Wholesale & retail | 2024 |
| RG Nest Ltd | Health & social care | 2023 |
| RG Technology Limited | Professional & scientific | 2011 |
| RGM Trade Ltd | Wholesale & retail | 2020 |
| Rhiannon Faith Company | Arts & recreation | 2019 |
| Rhtt Limited | Wholesale & retail | 2025 |
| RI8 Choice Ltd | Wholesale & retail | 2020 |
| Riantan Group Ltd | Construction | 2024 |
| Richactive Home Improvements Ltd | Construction | 2025 |
| Richard Anane Services Ltd | Administrative & support | 2019 |
| Richard Brown Accountants Limited | Professional & scientific | 2008 |
| Richard Morris (Construction) Limited | Construction | 1982 |
| Richards Cycles Limited | Wholesale & retail | 2024 |
| Richardson Rfpd UK Limited | Professional & scientific | 2010 |
| Richesse Ltd | Professional & scientific | 2023 |
| Richie Jones Homes Limited | Real estate | 2025 |
| Richmond Place One (Chadwell Heath) Management Company Limited | Households | 2003 |
| Richters Railway Services Limited | Construction | 2018 |
| Ricky's Service & M.O.T. Centre Limited | Wholesale & retail | 2011 |
| Ride on Time Limited | Wholesale & retail | 2016 |
| Ridge Solutions Limited | Information & communication | 2024 |
| Ridi Lighting Limited | Wholesale & retail | 1992 |
| Right Care Ltd | Health & social care | 2020 |
| Riley's Barbershop Ltd | Other services | 2021 |
| Rinden Properties UK Limited | Real estate | 2023 |
| RIS Contracts Ltd | Construction | 2018 |
| Risden Limited | Real estate | 1996 |
| Rise Community CIC | Arts & recreation | 2020 |
| Rise Community Inclusion Education Empowerment & Youth Quake CIC | Health & social care | 2020 |
| Rise UP Building Ltd | Construction | 2024 |
| Risers Bakehouse Ltd | Manufacturing | 2026 |
| Rising Creative Solutions Limited | Other services | 2013 |
| Ritailit Ltd | Other services | 2015 |
| Riva Residential Properties Limited | Real estate | 2026 |
| River Cafe Restaurant Ltd | Hospitality | 2025 |
| River Meadows (MK) Management Company Limited | Households | 2004 |
| Riveramobil Ltd | Construction | 2019 |
| Rivercourt Cirencester Limited | Households | 1989 |
| Rivermill Court Management Company Limited | Real estate | 1985 |
| Rivers Services Ltd | Health & social care | 2022 |
| Riverside Construction (Essex) Limited | Construction | 2016 |
| Riverside Court (Harlow) Limited | Households | 1993 |
| Riverside Drive Residents Company Limited | Households | 1997 |
| Riverside Nursery (Colchester) Number 2 Management Company Limited | Households | 2005 |
| Riverstone Court (Erith) NO.1 Residents Company Limited | Households | 1987 |
| Riverton Health Ltd | Health & social care | 2023 |
| Riverview Court RTM Company Ltd | Households | 2016 |
| Rivia House Management Limited | Households | 2023 |
| Rjburns Electrical Services Limited | Construction | 2018 |
| Rjhc Property Services Ltd | Professional & scientific | 2024 |
| RLA Electrical Ltd | Construction | 2020 |
| RMO UK Limited | Wholesale & retail | 1991 |
| RMR Building &Renovation Ltd | Construction | 2021 |
| RMS Carpentry Ltd | Manufacturing | 2025 |
| RN2016 Limited | Hospitality | 2023 |
| RO Tyres Ltd | Wholesale & retail | 2024 |
| ROA Health Limited | Health & social care | 2025 |
| Road Runner Trans Ltd | Transport & logistics | 2011 |
| Road Workers Facility Ltd | Construction | 2016 |
| Roadmap Series Limited | Wholesale & retail | 2025 |
| Roads & Sons Property Maintenance Ltd | Administrative & support | 2026 |
| Roadway Mover Ltd | Transport & logistics | 2020 |
| Robani Limited | Health & social care | 2022 |
| Robemma Ltd | Transport & logistics | 2019 |
| Robert Day Accountancy Limited | Professional & scientific | 2023 |
| Roberts Motorworks Limited | Wholesale & retail | 2014 |
| Roberts Sperrin Holdings Ltd | Construction | 2026 |
| Robin Pens Company Ltd | Wholesale & retail | 2016 |
| Robson Analytics Limited | Information & communication | 2019 |
| Robust Car Parts Limited | Wholesale & retail | 2020 |
| Robust IT Limited | Information & communication | 2011 |
| Rockdene Close Management Company Limited | Households | 2006 |
| Rocklow Pictures Ltd | Information & communication | 2024 |
| Rodenhurst Road Management Limited | Households | 2004 |
| Rodingtech Ltd | Information & communication | 2011 |
| ROI Property Services Limited | Real estate | 2016 |
| ROJ Express UK Ltd | Wholesale & retail | 2024 |
| Rolek Limited | Real estate | 2025 |
| Roman Stone Properties Ltd | Real estate | 2024 |
| Romans Gate (Gillingham) Management Company Limited | Households | 2005 |
| Rombex Technology Ltd | Information & communication | 2025 |
| Romeo's Venture UK Limited | Administrative & support | 2016 |
| Romsey Works Cambridge Management Company Limited | Households | 2019 |
| Roni Electronics Limited | Wholesale & retail | 1987 |
| Ronlan Limited | Professional & scientific | 2019 |