| Redstripe (U.K) Limited | Administrative & support | 2021 |
| Redstripe Environmental Limited | Administrative & support | 1996 |
| Redwood Residential Investments Ltd | Real estate | 2019 |
| Reeveselectro and Company Limited | Wholesale & retail | 2024 |
| Refill Van Ltd | Hospitality | 2019 |
| Refresh Brands Limited | Manufacturing | 2013 |
| REG 10 Limited | Professional & scientific | 2009 |
| Regallocs and Beauty Ltd | Other services | 2026 |
| Regals Construction Ltd | Construction | 2023 |
| Regen Automation Ltd | Manufacturing | 2022 |
| Regency Financial Management (Properties) Limited | Real estate | 2003 |
| Regent Wrought Iron Limited | Manufacturing | 2002 |
| Regrounded Limited | Wholesale & retail | 2024 |
| Rehoboth View Photos Limited | Professional & scientific | 2024 |
| Reid Logiq LLP | | 2003 |
| Reimagined Spaces Ltd | Real estate | 2024 |
| REINV8 Ltd | Information & communication | 2023 |
| Relate HR Ltd | Professional & scientific | 2020 |
| Relayfactor Limited | Manufacturing | 1990 |
| Reliable Air Tightness Testing Ltd | Professional & scientific | 2026 |
| Remmis Healthcare Ltd | Health & social care | 2026 |
| Renaissance Business Services Ltd | Administrative & support | 2018 |
| Renaissance Chauffeur Service Ltd | Administrative & support | 2018 |
| Renaisskin Limited | Other services | 2024 |
| Renovate Limited | Other services | 1992 |
| Renovation Street Ltd | Construction | 2025 |
| Renovo International Limited | Administrative & support | 1997 |
| Rensal Ltd | Hospitality | 2023 |
| Renturapp Limited | Information & communication | 2014 |
| Renuntians Ltd | Health & social care | 2024 |
| Resilient Creator Network Ltd | Professional & scientific | 2026 |
| Resolva Limited | Information & communication | 2017 |
| Respiratory Technology Limited | Manufacturing | 2019 |
| Rest and Nest Ltd | Hospitality | 2024 |
| Rest Assured Rooms Ltd | Real estate | 2022 |
| Rest&Calm Ltd | Health & social care | 2016 |
| Results Logistics Ltd | Transport & logistics | 2026 |
| Retail Protection Group Limited | Administrative & support | 2023 |
| Retro Healthcare Limited | Health & social care | 2016 |
| Retro Rogue Ltd | Wholesale & retail | 2025 |
| Retrowise Energy UK Ltd | Administrative & support | 2025 |
| Retune Ltd | Other services | 2025 |
| Return on Incentives Ltd | Administrative & support | 2020 |
| Reuse Electronics Ltd | Manufacturing | 2021 |
| Reveal Sales and Marketing Ltd | Wholesale & retail | 2018 |
| Review & Improve Ltd | Professional & scientific | 2017 |
| REVIN8 Ltd | Professional & scientific | 2023 |
| Revive Kettering CIC | Professional & scientific | 2025 |
| Revo Consultancy Services Limited | Administrative & support | 2013 |
| Revolution Sports (GB) Limited | Administrative & support | 2013 |
| RF Current Solutions Ltd | Construction | 2025 |
| Rflb Management Limited | Households | 2024 |
| Rgflex Ltd | Transport & logistics | 2021 |
| Rhino Bros Limited | Professional & scientific | 2011 |
| Rhino GAS, Plumbing & Heating Solutions Limited | Construction | 2007 |
| RHS Brickwork Limited | Construction | 2021 |
| RHT Property Ltd | Real estate | 2023 |
| Rhww Holdings Ltd | Real estate | 2021 |
| Richard Crouse Art Ltd | Administrative & support | 2021 |
| Richard James Estate Agents (Irthlingborough) Limited | Other services | 2005 |
| Richard James Estate Agents (Rushden) Ltd | Other services | 2015 |
| Richard James Estate Agents (Wellingborough) Limited | Other services | 2005 |
| Richard James Lettings & Management Limited | Real estate | 2018 |
| Richard Meaden Media Limited | Information & communication | 2011 |
| Richard Sanders Holdings Limited | Administrative & support | 2019 |
| Richard Sanders Limited | Wholesale & retail | 2002 |
| Richmond Ceramics Limited | Construction | 2011 |
| Richmond Hill Park Limited | Real estate | 2021 |
| Rico-Scapes Ltd | Construction | 2021 |
| Ricotta Plumbing and Heating Limited | Construction | 2019 |
| Riddings Limited | Wholesale & retail | 2016 |
| Ridge Roofing and Building Contractors Ltd | Construction | 2025 |
| Ridout Consultancy Limited | Professional & scientific | 2012 |
| Rigby-White Property Ltd | Real estate | 2024 |
| Right Choice Lettings Ltd | Real estate | 2022 |
| Right Lettings Company Limited | Extraterritorial | 2011 |
| Rightjob Limited | Extraterritorial | 1988 |
| Rightside London Ltd | Wholesale & retail | 2022 |
| Riley and Revell Limited | Professional & scientific | 2011 |
| Rise Marketing & Commerce Limited | Professional & scientific | 2025 |
| Riverhale Properties Limited | Real estate | 2022 |
| Riverstone Real Estates Ltd | Real estate | 2020 |
| Riya Davies Ltd | Wholesale & retail | 2024 |
| RIZ One Group Ltd | Hospitality | 2020 |
| RJ Plumbing and Heating Ltd | Construction | 2016 |
| RJ Pooni Limited | Real estate | 2022 |
| RJ Propco Ltd | Real estate | 2023 |
| RJB Engineering Solutions Ltd | Manufacturing | 2015 |
| RJB Scientific Consulting Limited | Professional & scientific | 2018 |
| RJE Holdings Ltd | Financial services | 2016 |
| RJH Plumbing & Pipework Services Ltd | Construction | 2014 |
| RJM Consultants Ltd | Information & communication | 2017 |
| RJM Design Studios Limited | Professional & scientific | 2021 |
| RK Cabs Limited | Transport & logistics | 2025 |
| RK Homes (Northants) Ltd | Construction | 2024 |
| Rkeb Holdings Ltd | Real estate | 2023 |
| RKM Consultants Limited | Professional & scientific | 2024 |
| RL Napier Properties Ltd | Real estate | 2020 |
| RLJ Logistics Ltd | Transport & logistics | 2026 |
| RLK Repairs & Renovations Ltd | Construction | 2020 |