| Remicist Limited | Information & communication | 2024 |
| Remilo Limited | Health & social care | 2023 |
| Remoteq Limited | Information & communication | 2025 |
| Renade UK Ltd | Wholesale & retail | 2022 |
| Renaissance Stoves Limited | Construction | 2012 |
| Renderfx Ltd | Financial services | 2023 |
| Rendervex Ltd | Information & communication | 2026 |
| Rene Crevel Consulting Ltd | Professional & scientific | 2017 |
| Renewables for Schools C.I.C. | Professional & scientific | 2015 |
| Renewclean Group Ltd | Administrative & support | 2025 |
| Renewlar Ltd | Professional & scientific | 2024 |
| Renova Construction & Property Maintenance Ltd | Construction | 2025 |
| Renovate Concepts Limited | Construction | 2018 |
| Renovations by Duke Ltd | Construction | 2023 |
| Renowins Ltd | Administrative & support | 2025 |
| Rentu App Ltd | Information & communication | 2025 |
| Renu Medical Aesthetics Clinic Ltd | Health & social care | 2022 |
| Renx Management Ltd | Professional & scientific | 2020 |
| Repair and Restore Limited | Construction | 2017 |
| Repairs ETC Newcastle Ltd | Other services | 2019 |
| Repeatable Solutions Ltd | Professional & scientific | 2025 |
| Replastify (Precious Plastic) Limited | Extraterritorial | 2023 |
| Repm Solutions Ltd | Professional & scientific | 2012 |
| Repose Stays Ltd | Hospitality | 2024 |
| Repossessions Fleet Direct Ltd | Wholesale & retail | 2026 |
| Repro Stream Ltd | Information & communication | 2021 |
| Reqoraq Form Records Ltd | Information & communication | 2026 |
| Requisite Limited | Information & communication | 2011 |
| Rescue Line Wellness and First AID Training Ltd | Public administration | 2022 |
| Research Academy Limited | Education | 2013 |
| Research Seed Ltd | Information & communication | 2023 |
| Researcherconferences Ltd | Professional & scientific | 2025 |
| Reset and Restore CIC | Health & social care | 2026 |
| Resi Surveys Ltd | Professional & scientific | 2024 |
| Residency Property Investments Limited | Real estate | 2026 |
| Residential Business Services Ltd | Construction | 2010 |
| Resilience Vessel Systems Ltd | Professional & scientific | 2025 |
| Resilient Records Group Ltd | Information & communication | 2023 |
| Resolute Biocare Limited | Administrative & support | 2025 |
| Resolutio Mundi Limited | Information & communication | 2025 |
| Resolve LDN Limited | Professional & scientific | 2026 |
| Resonant Tech Ltd | Information & communication | 2024 |
| Resonify Limited | Information & communication | 2025 |
| Responding to Climate Change Limited | Professional & scientific | 2002 |
| Rest Wine Ltd | Wholesale & retail | 2018 |
| Restorative Holidays Ltd | Hospitality | 2025 |
| Restorative IQ Community Interest Company | Professional & scientific | 2018 |
| Restoring Relationships Ltd | Administrative & support | 2023 |
| Resva Limited | Construction | 2013 |
| Rethink Recovery Ltd | Health & social care | 2021 |
| Retisentia Ltd | Wholesale & retail | 2020 |
| Retna of Soho Limited | Construction | 2001 |
| Retro Styler Ltd | Wholesale & retail | 2009 |
| Retrofitted Limited | Manufacturing | 2019 |
| Retrorev Limited | Wholesale & retail | 2025 |
| REV Fitness Academy Ltd | Arts & recreation | 2014 |
| Reva Homes Limited | Administrative & support | 2022 |
| Reva Projects Ltd | Construction | 2019 |
| Revale Homes Ltd | Real estate | 2026 |
| Revawake Ltd | Manufacturing | 2026 |
| Revelation Housing Ltd | Real estate | 2024 |
| Revenue DIY Ltd | Information & communication | 2023 |
| Revenue Genie Limited | Professional & scientific | 2024 |
| Review Sense AI Limited | Information & communication | 2025 |
| Revise Route Ltd | Information & communication | 2025 |
| Revisionquest Ltd | Information & communication | 2026 |
| Revive Innovations Ltd | Professional & scientific | 2019 |
| Revive Suffolk CIC | Agriculture & fishing | 2024 |
| Revo Software Limited | Information & communication | 2024 |
| Revolution Fabrications Ltd | Professional & scientific | 2020 |
| Revolutionary Change Ltd | Professional & scientific | 2021 |
| Revupretail Limited | Wholesale & retail | 2024 |
| Revvies Energy Strips Limited | Manufacturing | 2014 |
| Rewired Southwest Electrical Ltd | Construction | 2025 |
| REX AI Ltd | Information & communication | 2026 |
| Rexberg Enterprises Limited | Wholesale & retail | 2022 |
| Rexmia Limited | Real estate | 2022 |
| Reyach Multimedia Arts and Entertainment Services Limited | Information & communication | 2004 |
| Reynamaldita Ltd | Administrative & support | 2016 |
| Rezeki Clothing Limited | Wholesale & retail | 2026 |
| Rezsecops Ltd | Information & communication | 2024 |
| RF Tracking Ltd | Transport & logistics | 2009 |
| RG London 2023 Limited | Hospitality | 2023 |
| RGG Telecommunication Services Ltd | Information & communication | 2018 |
| RGO Anywhere Limited | Information & communication | 2015 |
| Rgtc Services Ltd | Wholesale & retail | 2025 |
| Rgvm Property Services Ltd | Transport & logistics | 2026 |
| RGY Homes Limited | Construction | 2024 |
| RH Marketing Limited | Professional & scientific | 2023 |
| RH Real Estate Holdings Limited | Real estate | 2025 |
| Rheen Group Ltd | Wholesale & retail | 2025 |
| Rhema Hair Ltd | Other services | 2026 |
| Rheo Clothing Ltd | Wholesale & retail | 2024 |
| Rheo UNO Ltd | Other services | 2020 |
| Rheya Labs Limited | Professional & scientific | 2026 |
| Rhinecore Solutions Ltd | Information & communication | 2025 |
| Rhino Projects Ltd | Construction | 2022 |
| RHK Entertainment Ltd | Arts & recreation | 2023 |
| Rhys Ecom Ltd | Wholesale & retail | 2023 |
| Rhys Warlow Ltd | Information & communication | 2021 |