| Raven Intelligence Limited | Information & communication | 2025 |
| Raven's Convenience Store Ltd | Wholesale & retail | 2018 |
| Ravenoak Joinery Ltd | Manufacturing | 2026 |
| Ravensway Mini Mart Limited | Wholesale & retail | 2024 |
| Ravenswood Sandsend Limited | Households | 2017 |
| RAY of Light Electrical Services Limited | Construction | 2011 |
| Razorline Music Ltd | Information & communication | 2010 |
| Razvan Preda Limited | Transport & logistics | 2017 |
| RB Civil Engineering Ltd | Construction | 2020 |
| RBB Properties Ltd | Real estate | 2014 |
| Rbdealsuk Ltd | Wholesale & retail | 2025 |
| RC Lettings & Management Ltd | Real estate | 2024 |
| RCM Innovation Limited | Administrative & support | 2019 |
| RCS Landscapes Ltd | Professional & scientific | 2026 |
| RDL Coventry Ltd | Financial services | 2018 |
| RDS Tactical Limited | Wholesale & retail | 2025 |
| RDY Steady Ltd | Transport & logistics | 2019 |
| Reachout Training Limited | Information & communication | 2017 |
| Readyspex Holdings Limited | Administrative & support | 2016 |
| Readyspex Limited | Wholesale & retail | 1989 |
| Real Loco Leasing Ltd | Administrative & support | 2026 |
| Real PCS Limited | Health & social care | 2014 |
| Real PCS Properties Ltd | Real estate | 2024 |
| Real Target Ltd | Administrative & support | 2024 |
| Real-Hr Ltd | Administrative & support | 2022 |
| Really Good Action Ltd | Other services | 2016 |
| Reaper-Records Ltd | Wholesale & retail | 2024 |
| Reardon Entrepreneurs Ltd | Information & communication | 2020 |
| Rebel Fit Clothing Ltd | Wholesale & retail | 2025 |
| Rebel Food Co Ltd | Hospitality | 2026 |
| Reckless Auto Parts Limited | Wholesale & retail | 2016 |
| Recoop Health Limited | Other services | 2015 |
| Recruit 4 Medical Limited | Administrative & support | 2024 |
| Red Door Property Solutions Ltd | Real estate | 2020 |
| Red Essence Kitchen Ltd | Hospitality | 2025 |
| Red Lotus Private Limited | Health & social care | 2021 |
| Red Moose Holdings Ltd | Financial services | 2026 |
| Red Rooster Fried Chicken Ltd | Hospitality | 2020 |
| Redgate Pubs Ltd | Hospitality | 2010 |
| Redmann Builders Ltd | Construction | 2024 |
| Redwing Environmental Limited | Professional & scientific | 2003 |
| Redwood Wharf Yard Ltd | Construction | 2017 |
| REE Software UK Ltd | Information & communication | 2026 |
| Reel ROD Squad CIC | Agriculture & fishing | 2024 |
| Refine Medical Aesthetics Ltd | Health & social care | 2022 |
| Reform London Ltd | Arts & recreation | 2025 |
| Reform Solihull Ltd | Arts & recreation | 2025 |
| Reformed Care Limited | Health & social care | 2024 |
| Regent Retail Ltd | Manufacturing | 2006 |
| Regional Warranty Inspectors Limited | Professional & scientific | 2019 |
| Reglaze Glasses Direct Ltd | Wholesale & retail | 2017 |
| Regucy Radiators Limited | Wholesale & retail | 2023 |
| Reiss Blake HGV Driver Limited | Transport & logistics | 2016 |
| Reload Marketing Services Ltd | Professional & scientific | 2016 |
| Remote Sales Specialists Ltd | Professional & scientific | 2024 |
| Renaissance Management Consultancy Limited | Professional & scientific | 2016 |
| Rencl Industries Limited | Professional & scientific | 2016 |
| Rendition Limited | Other services | 2008 |
| Renew Marketing Ltd | Professional & scientific | 2012 |
| Renn Barber Co Ltd | Other services | 2023 |
| Rent a Room (National) Limited | Real estate | 2018 |
| Reopac Consult Limited | Professional & scientific | 2025 |
| Reperis Ltd | Professional & scientific | 2024 |
| RES Props Limited | Real estate | 2025 |
| Resgl Auto Electrical Ltd | Wholesale & retail | 2016 |
| Residential Home Solutions Ltd | Extraterritorial | 2009 |
| Resonate Advanced Engineering Ltd | Professional & scientific | 2026 |
| Resurge Autos Ltd | Wholesale & retail | 2025 |
| Retenshion Limited | Professional & scientific | 2025 |
| Retrodee Toys Ltd | Wholesale & retail | 2026 |
| Reubels Ltd | Wholesale & retail | 2017 |
| Reuben Heaton Limited | Manufacturing | 1998 |
| Revelio Ltd | Wholesale & retail | 2023 |
| Revival Restorations Limited | Manufacturing | 2013 |
| Revive Nest Ltd | Transport & logistics | 2021 |
| Reviverise Ltd | Health & social care | 2024 |
| Revolut Lease Ltd | Financial services | 2023 |
| Revoobit UK Limited | Wholesale & retail | 2022 |
| Reymerston Hall Weddings Limited | Hospitality | 2023 |
| RF Catalyst Automotive Ltd | Professional & scientific | 2026 |
| RG Trade & Recovery Ltd | Transport & logistics | 2024 |
| RH Flooring Limited | Construction | 2020 |
| Rhenus Warehousing Solutions Holdings Limited | Transport & logistics | 1997 |
| Rhenus Warehousing Solutions Ltd | Transport & logistics | 1990 |
| Rhenus Warehousing Solutions UK Ltd | Transport & logistics | 2007 |
| Rhubarb & Mustard Ltd | Hospitality | 2016 |
| Ri-Ro-Ra Limited | Real estate | 2020 |
| RIA Drive Ltd | Transport & logistics | 2019 |
| Ribble North Ltd | Real estate | 2018 |
| Ricco Associates Limited | Professional & scientific | 2010 |
| Rice Group Holdings Ltd | Financial services | 2026 |
| Rice Property Services Midlands Limited | Construction | 2021 |
| Rice Rentals Ltd | Real estate | 2024 |
| Rich DE LA Mare Design Limited | Professional & scientific | 2023 |
| Richard Clark Farriery Limited | Professional & scientific | 2007 |
| Richard Geoffrey Newey Limited | Professional & scientific | 2010 |
| Ricky Global Consultants Limited | Information & communication | 2013 |
| Ricky Phillips Farriery Services Limited | Agriculture & fishing | 2017 |
| Ricofy Ltd | Administrative & support | 2025 |
| Ricosta Capital Limited | Financial services | 2018 |