| Resinest Ltd | Real estate | 2021 |
| Resolute Deso Ltd | Information & communication | 2025 |
| Resolute Security Solutions Global Ltd | Administrative & support | 2025 |
| Resorts Golf Limited | Arts & recreation | 2024 |
| Resource Maintenance Limited | Real estate | 1980 |
| Resourceful Interim Management Limited | Administrative & support | 2014 |
| Respectful Care Franchising Limited | Health & social care | 2015 |
| Restgate Holdings Limited | Financial services | 2026 |
| Resting Limited | Hospitality | 2025 |
| Restoration Trading Limited | Hospitality | 2025 |
| Retail Property Advantage Limited | Professional & scientific | 2026 |
| Retail Revolution Ltd | Wholesale & retail | 2008 |
| Retail Systems Limited | Information & communication | 2002 |
| Retail With Clarity Ltd | Professional & scientific | 2018 |
| Retricity Limited | Professional & scientific | 2026 |
| Reveni SPV 1 LLP | | 2022 |
| Review (Bicester) Limited | Real estate | 2021 |
| Review (Oxfordshire) Limited | Real estate | 2020 |
| Review Partners Limited | Real estate | 2015 |
| Revisepal Limited | Information & communication | 2021 |
| Revitaleyes Aesthetics Ltd | Health & social care | 2025 |
| Revo Secondary SPV LLP | | 2021 |
| Revolutionise Recruitment Limited | Administrative & support | 2024 |
| Revolve Management Limited | Professional & scientific | 2017 |
| Revsite Limited | Construction | 1977 |
| Rewind Productions Ltd | Information & communication | 2018 |
| Rextech Consulting Ltd | Professional & scientific | 2020 |
| Reynolds Studio Limited | Administrative & support | 2022 |
| RF Comms Ltd | Information & communication | 2014 |
| RF Personal Training Ltd | Other services | 2019 |
| RFH Radiology Ltd | Health & social care | 2020 |
| RFK Architects Limited | Professional & scientific | 2002 |
| RFM Shepherd Ltd | Manufacturing | 2025 |
| RG Consultant Ltd | Administrative & support | 2023 |
| RGH Software Ltd | Information & communication | 2022 |
| RGS Golf Services Ltd | Wholesale & retail | 2018 |
| RH Technical Solutions Ltd | Information & communication | 2012 |
| Ribbon Technologies Ltd | Professional & scientific | 2020 |
| Riberaway Ltd | Professional & scientific | 2024 |
| Richard Dorsett Research Ltd | Professional & scientific | 2014 |
| Richard Foulger Consulting Ltd | Professional & scientific | 2023 |
| Richard Griffin (1820) Limited | Wholesale & retail | 1891 |
| Richard LEE Consultancy Limited | Professional & scientific | 2011 |
| Richard LEE Goalkeeping Consultancy Ltd | Professional & scientific | 2019 |
| Richard LEE Holdings Ltd | Professional & scientific | 2019 |
| Richard Price and Chris Hunt Limited | Information & communication | 1999 |
| Richard Sheppard Photography Ltd | Professional & scientific | 2023 |
| Richards Carpentry & Joinery of ST Albans Ltd | Manufacturing | 2025 |
| Richardson Birkett Communications Limited | Professional & scientific | 1991 |
| Richs Wine Club Ltd | Wholesale & retail | 2026 |
| Ricson Group Limited | Administrative & support | 2019 |
| Ricson Hapstone Ltd | Administrative & support | 2007 |
| Ricson Rowcastle Ltd | Administrative & support | 2007 |
| Ricson Services Ltd | Administrative & support | 2004 |
| Ricson Zarlon Ltd | Administrative & support | 2007 |
| Ride the Warble Ltd | Arts & recreation | 2008 |
| Rider Taxis Limited | Transport & logistics | 2026 |
| Ridgemore Ltd | Water & waste | 2024 |
| Ridgewhite Consultancy Ltd | Professional & scientific | 2012 |
| Ridgewood Property Solutions Limited | Construction | 2014 |
| Ridgmont Road Nursery Limited | Health & social care | 2011 |
| Riga Logistical Ltd | Hospitality | 2025 |
| Right Motorsport Ltd | Professional & scientific | 2024 |
| Right Plumbing Limited | Construction | 2023 |
| Right Touch Roofing Ltd | Construction | 2019 |
| Rightbuild App Limited | Information & communication | 2021 |
| Rightflow Ltd | Wholesale & retail | 2025 |
| Rigon Energy Limited | Professional & scientific | 2018 |
| Rigon Exploration Limited | Mining & quarrying | 2019 |
| Rigon Operations Limited | Mining & quarrying | 2020 |
| Rina Barbers Limited | Other services | 2022 |
| Rina Construction Limited | Construction | 2019 |
| Rina Properties Limited | Real estate | 2021 |
| Rina's Coffee Ltd | Hospitality | 2022 |
| Rinkt Ltd | Information & communication | 2021 |
| RIO Lounge Ltd | Administrative & support | 2012 |
| Ripple Innovation Limited | Professional & scientific | 2023 |
| Ripsu Ltd | Information & communication | 2012 |
| Rise Commercial Cleaning Limited | Administrative & support | 2015 |
| Riseley Property Services Ltd | Extraterritorial | 2018 |
| Rising Sons Ltd | Education | 2026 |
| Risingstar Haven Ltd | Health & social care | 2026 |
| River Shwe LI Ltd | Hospitality | 2022 |
| RIZ Dasu Consulting Ltd. | Professional & scientific | 2016 |
| Rize AG X Semper SPV 1 LLP | | 2021 |
| RJ Connect Ltd | Wholesale & retail | 2025 |
| RJ Moody Properties Limited | Real estate | 2026 |
| RJ T.Projects Ltd | Construction | 2019 |
| Rjlenterprises Ltd | Professional & scientific | 2026 |
| RJT Investments Ltd | Real estate | 2021 |
| RJW Auto Solutions Ltd | Manufacturing | 2018 |
| RK GP Locum Ltd | Health & social care | 2015 |
| RK Interior Architectural Design Ltd. | Professional & scientific | 2021 |
| Rkug Ltd | Professional & scientific | 2025 |
| RL Zeyko Ltd | Administrative & support | 2012 |
| Rlcb Limited | Administrative & support | 2016 |
| RLF Works Ltd | Manufacturing | 2024 |
| RM Accountants Limited | Professional & scientific | 1999 |
| RM Ventures Limited | Arts & recreation | 2019 |
| RMA Consultants Limited | Professional & scientific | 2012 |