| Reeves Wireline Technologies Limited | Manufacturing | 1908 |
| Reflection Studio (Leicester) Limited | Professional & scientific | 2014 |
| Reflex Fleet Solutions Limited | Administrative & support | 2025 |
| Reflex VE Limited | Transport & logistics | 2025 |
| Reflexion Transport Ltd | Transport & logistics | 2015 |
| REFRIGER8 Limited | Manufacturing | 2008 |
| Regal Tools UK Limited | Wholesale & retail | 2013 |
| Reggae Shack Limited | Hospitality | 2025 |
| REGUL8 Mental Health & Well-Being CIC | Education | 2022 |
| Reid Business Consultancy Limited | Professional & scientific | 2008 |
| Reignmakers Ltd | Other services | 2016 |
| Rein Investments Ltd | Real estate | 2021 |
| Rejuvea Ltd | Health & social care | 2010 |
| Rejuvemed Ltd | Health & social care | 2018 |
| Reliable AVC Solutions Ltd | Transport & logistics | 2026 |
| Relocation Management Services Limited | Real estate | 2019 |
| Relva Ltd | Construction | 2006 |
| Remotely Human Limited | Professional & scientific | 2021 |
| Rems Solutions Limited | Construction | 2017 |
| Renaissance Railcars Ltd. | Manufacturing | 2018 |
| Rendell Primary School | Education | 2012 |
| Rendserve Limited | Construction | 2012 |
| Renergy Systems Ltd | Professional & scientific | 2021 |
| Renev Limited | Arts & recreation | 2018 |
| Renevo Holdings Limited | Real estate | 2025 |
| RENOV8 Everything Limited | Extraterritorial | 2017 |
| RENOV8 Spaces Limited | Construction | 2020 |
| Repair Rework Restore Limited | Manufacturing | 2024 |
| Repleat Catering Ltd | Hospitality | 2025 |
| Resistant Inc Limited | Construction | 2023 |
| Resolvpoint Limited | Financial services | 2010 |
| Resonate Accountants & Tax Advisers Limited | Professional & scientific | 2024 |
| Resource Factor Community Interest Company | Professional & scientific | 2017 |
| Responsibly Limited | Manufacturing | 2012 |
| Resto Clean Limited | Administrative & support | 2024 |
| Restoration Europe Limited | Extraterritorial | 2002 |
| Retro Buildings Renovation Ltd | Real estate | 2009 |
| Retro City Touring Ltd | Administrative & support | 2024 |
| Retro MID Century Ltd | Wholesale & retail | 2016 |
| Retro Sugar Rush Ltd | Wholesale & retail | 2024 |
| Revamp Property Limited | Real estate | 2024 |
| Revelation Marketing Ltd | Professional & scientific | 2023 |
| Reveles Limited | Financial services | 2023 |
| Revive Childhood Ltd | Arts & recreation | 2026 |
| Revive POS Ltd | Construction | 2019 |
| Revolt Real Estate Ltd | Real estate | 2025 |
| Rexhaven a LLP | | 2022 |
| Rexhaven B LLP | | 2022 |
| Rexhaven C LLP | | 2022 |
| Rexhaven D LLP | | 2022 |
| Rexhaven E LLP | | 2023 |
| Rexhaven F LLP | | 2023 |
| Rexhaven G LLP | | 2023 |
| Rexhaven H LLP | | 2023 |
| Rexhaven LLP | | 2022 |
| Reynolds Dryline Limited | Construction | 2021 |
| Reynolds Property Limited | Real estate | 2016 |
| RGB Ltd | Real estate | 2024 |
| Rhan Jewellery Limited | Manufacturing | 2025 |
| Rhodes Ebbs Restaurants Limited | Hospitality | 2015 |
| Rhondama Limited | Wholesale & retail | 1974 |
| Rhubarb Properties Limited | Real estate | 2024 |
| Riah Hair Studio Ltd | Other services | 2026 |
| Riata Foods Limited | Manufacturing | 2010 |
| Rich & MI Limited | Hospitality | 2018 |
| Richard Cashmore Limited | Other services | 2003 |
| Richard Harrison Estate Agents and Valuers Ltd | Real estate | 2024 |
| Richard Reed Golf Ltd | Education | 2014 |
| Richard Vincent Ltd | Construction | 2009 |
| Richards Green Consulting Limited | Information & communication | 2025 |
| Richardson Homes Limited | Construction | 2010 |
| Richardson Partners (Loughborough) Limited | Professional & scientific | 2024 |
| Ride Cars Ltd | Administrative & support | 2026 |
| Ridgefield Leasing Ltd | Administrative & support | 2016 |
| Ridwell Interiors Limited | Manufacturing | 2022 |
| Right Blinds Ltd | Wholesale & retail | 2018 |
| Right Blinds(Franchise) Limited | Wholesale & retail | 2019 |
| Righteous Branch Limited | Hospitality | 2019 |
| Rightly Managed Limited | Professional & scientific | 2025 |
| Rightsfix Ltd | Information & communication | 2025 |
| Rightway Property Development Ltd | Construction | 2024 |
| Rigid Erections and Fabrications Ltd | Construction | 2005 |
| Rikooz Partners Limited | Professional & scientific | 2022 |
| Rin's Thai Kitchen Ltd | Hospitality | 2020 |
| Rings Boxing Ltd | Arts & recreation | 2024 |
| Riot Racing Club Ltd | Arts & recreation | 2020 |
| Rise and Roar Limited | Wholesale & retail | 2025 |
| Riskintel Limited | Professional & scientific | 2017 |
| Ritrav Limited | Health & social care | 2022 |
| Riverview Reptiles Ltd | Wholesale & retail | 2024 |
| Rizi Limited | Professional & scientific | 2014 |
| Rizq Renovation Ltd | Construction | 2026 |
| RJB Core Ltd | Real estate | 2025 |
| RJC Accountants Limited | Professional & scientific | 2025 |
| RJF Transport Management Ltd | Transport & logistics | 2024 |
| RJM Livestock Limited | Administrative & support | 2020 |
| RKL Wealth Management Limited | Financial services | 2019 |
| RKS Inspired Ltd | Manufacturing | 2020 |
| RKV Holdings Ltd. | Financial services | 2021 |
| RLC Technology Limited | Manufacturing | 2006 |