| Regintel Consulting Ltd | Professional & scientific | 2025 |
| Regnbue Ltd | Administrative & support | 2016 |
| REJ Architects Ltd | Professional & scientific | 2025 |
| Related Properties Ltd | Real estate | 2023 |
| Remigia Limited | Administrative & support | 1977 |
| Renaissance Renovations Group Ltd | Construction | 2022 |
| Renegade Wines Limited | Manufacturing | 2016 |
| Renney Resources Limited | Professional & scientific | 2011 |
| RENOV8 Building Contractors Ltd | Construction | 2021 |
| Renumbered Limited | Professional & scientific | 2024 |
| Replacement Keys Ltd | Manufacturing | 2019 |
| RES Firma Ltd | Professional & scientific | 2016 |
| Resilient Beans Limited | Manufacturing | 2024 |
| Resolutum Developments Ltd | Financial services | 2017 |
| Restart Vodka Limited | Wholesale & retail | 2026 |
| Restorer Network Ltd | Information & communication | 2024 |
| Result XG Limited | Information & communication | 2025 |
| Retail and Commercial Interiors Ltd | Construction | 2019 |
| Revampt Ltd | Wholesale & retail | 2024 |
| Revana Ltd | Real estate | 2025 |
| Revva Holdings Limited | Information & communication | 2024 |
| REX & OBI Limited | Health & social care | 2018 |
| REX Apartments Management Company Limited | Households | 2002 |
| RGK Media Limited | Information & communication | 2005 |
| RGM Group Holdings Ltd | Hospitality | 2022 |
| RGP Geology Limited | Professional & scientific | 2021 |
| Rhino Shark Services Limited | Information & communication | 2023 |
| Ri-Conx Limited | Professional & scientific | 2022 |
| Richard Grant Mouldings Limited | Manufacturing | 1992 |
| Richard Roff Limited | Agriculture & fishing | 2006 |
| Richardson Financial Operations Ltd | Financial services | 2019 |
| Richardson-Prachai Solutions Ltd | Professional & scientific | 2012 |
| Richmond House Hotel & Apartments (Hunstanton) Ltd | Hospitality | 2024 |
| Rick Dickinson Solutions Ltd | Information & communication | 2008 |
| Rickesh Kundi Financial Services Ltd | Financial services | 2022 |
| Ricky Artee Patel Limited | Real estate | 2021 |
| Ridgefleet Limited | Households | 1984 |
| Ridgelift AM Ltd | Professional & scientific | 2019 |
| Ridgelift DM Limited | Professional & scientific | 2018 |
| Ridgeway Court (Aylesbury) Residents Company Limited | Households | 1970 |
| Ridgeway Furniture Manufacturing Limited | Manufacturing | 2002 |
| Ridgeway Leisure Online Limited | Extraterritorial | 2016 |
| Rigoletto Limited | Financial services | 2018 |
| RIJ Property Developers Limited | Construction | 2016 |
| Ringcraft Boxing Limited | Other services | 2020 |
| Rios Chicken and Burgers Limited | Hospitality | 2024 |
| Riptide Espresso Limited | Hospitality | 2022 |
| Rise Property Services Limited | Real estate | 2007 |
| Riverbank Housing Ltd | Health & social care | 2023 |
| Riverview PM Ltd | Professional & scientific | 2022 |
| Rizzi & Atlas Solutions Limited | Information & communication | 2025 |
| RJZ Property Investments Limited | Real estate | 2020 |
| Rktek Labs Ltd | Information & communication | 2026 |
| RM Architectural Consultants Limited | Professional & scientific | 2013 |
| RMF Engineering Systems Limited | Professional & scientific | 2017 |
| RMS Estate Agents Limited | Real estate | 2013 |
| RMS Mortgage Services Limited | Financial services | 2005 |
| RNS Welding Limited | Construction | 2010 |
| Roadgrip Ltd | Construction | 1995 |
| Roam and Roost Canal Boat Holidays Ltd | Administrative & support | 2022 |
| ROB Archer Limited | Professional & scientific | 2013 |
| ROB Howard Entertainment Ltd | Arts & recreation | 2021 |
| Robcoach Ltd | Education | 2025 |
| Robcon Industries Ltd | Real estate | 2022 |
| Robert Frances LLP | | 2015 |
| Robert Hill Limited | Construction | 2005 |
| Robert S J Lucas Limited | Information & communication | 2007 |
| Robert Webb Developments Limited | Administrative & support | 2014 |
| Roberts & Co Property Management Limited | Extraterritorial | 2006 |
| Roberts Accountancy & Tax Limited | Professional & scientific | 2013 |
| Robyon Limited | Construction | 2014 |
| Rochat Ventures Ltd | Health & social care | 2026 |
| Rocket & Robes Limited | Extraterritorial | 2020 |
| Rockleigh Court Maintenance Company Limited | Households | 1979 |
| Rocky Road Rescue UK Ltd | Other services | 2021 |
| ROD and Reel Entertainment Limited | Professional & scientific | 2025 |
| ROD and Reel Studios Limited | Professional & scientific | 2025 |
| Roger Fife Therapy Ltd | Health & social care | 2026 |
| Rojser Limited | Hospitality | 2026 |
| ROL Properties Limited | Real estate | 2022 |
| Rollhard Group Limited | Wholesale & retail | 2020 |
| Rolling Drums Studio Ltd | Arts & recreation | 2011 |
| Roma Domestic and Commercial Heating Services Ltd | Construction | 2019 |
| Ropa Court Residents Association Limited | Households | 1995 |
| Ropa Investment Holdings Limited | Professional & scientific | 1973 |
| Rosa Investigations Limited | Administrative & support | 2025 |
| Rosalind Martin Consulting Ltd | Education | 2015 |
| Rose Vill Group Ltd | Real estate | 2023 |
| Rose Vill Homes (West Raynham 1) Ltd | Real estate | 2026 |
| Rose Vill Homes Ltd | Real estate | 2022 |
| Rose Wellbeing Limited | Health & social care | 2025 |
| Rosebery Mews Mentmore Management Company Limited | Households | 1991 |
| Rosetta Systems Ltd. | Information & communication | 2015 |
| Rosina Antenucci Aesthetics Ltd | Other services | 2022 |
| Rosroe Ltd | Information & communication | 2021 |
| Rothesay Court Management Company Limited | Households | 1989 |
| Roundarch Property Management Company Limited | Households | 1991 |
| Route 47 Events Ltd | Hospitality | 2023 |
| ROUTE66DINERLB Limited | Hospitality | 2024 |
| Rowland Close Management Company Limited | Households | 2007 |