| Reminiscens Ltd | Wholesale & retail | 2025 |
| Reminisceuk Ltd | Professional & scientific | 2024 |
| Remity Staffing Solution Ltd | Administrative & support | 2021 |
| Remkol Ltd | Information & communication | 2019 |
| Remodelling Homes Ltd | Construction | 2023 |
| Remon Fire Safety Limited | Public administration | 2017 |
| Remora Vehicle Leasing Limited | Administrative & support | 2023 |
| Remote Growth Limited | Administrative & support | 2025 |
| Rems International Limited | Information & communication | 1998 |
| Remus RBM Limited | Hospitality | 2025 |
| Remworx Limited | Information & communication | 2015 |
| REN Pharma Limited | Professional & scientific | 2022 |
| Rena Jawad Ltd | Other services | 2017 |
| Renasci Concepts Ltd | Health & social care | 2020 |
| Renatus IT Consulting Limited | Professional & scientific | 2025 |
| Renbe UK Ltd | Wholesale & retail | 2022 |
| Rence Logistics Ltd | Extraterritorial | 2019 |
| Renergy Power Limited | Wholesale & retail | 2016 |
| Renew Life CIC | Health & social care | 2026 |
| Renew Ventures Ltd | Wholesale & retail | 2011 |
| Renewable on (MK) Ltd | Other services | 2014 |
| Renewable on Ltd | Construction | 2004 |
| Renewable Solutioners Ltd | Construction | 2021 |
| Renewable Technology Ltd | Information & communication | 2018 |
| Renewed Strength CIC | Arts & recreation | 2024 |
| Renewright Ltd | Construction | 2012 |
| Renewvest Limited | Financial services | 2026 |
| Renkeith Property Services Ltd | Real estate | 2019 |
| Renna Care Consultancy and Training Ltd | Health & social care | 2020 |
| Rennison Consulting Limited | Professional & scientific | 2008 |
| Reno MK Investment Ltd | Real estate | 2025 |
| Reno Transport Ltd | Wholesale & retail | 2025 |
| Renomk Group Ltd | Construction | 2025 |
| Renomk Ltd | Construction | 2024 |
| RENOV8 Kitchens Limited | Construction | 2016 |
| Renovaforma Limited | Construction | 2025 |
| Renovation Repair Limited | Construction | 2025 |
| Renovationmk Limited | Construction | 2018 |
| Rensburg & SON Limited | Information & communication | 2021 |
| Rent Home Made Easy Limited | Real estate | 2017 |
| Rentakeeper Ltd | Administrative & support | 2003 |
| Rentmove Ltd | Real estate | 2016 |
| Rentplus Homes Limited | Real estate | 2021 |
| Rentplus-Uk Limited | Real estate | 2013 |
| Renushance Limited | Extraterritorial | 2024 |
| Renvia IT Ltd | Water & waste | 2025 |
| Renz (UK) Ltd | Manufacturing | 1992 |
| Repaircare London Limited | Construction | 2010 |
| Repaired by MO Ltd | Information & communication | 2025 |
| Repr Fitness Limited | Information & communication | 2025 |
| Rept Ltd | Wholesale & retail | 2012 |
| Republika Interactive UK Ltd | Other services | 2016 |
| Reputly Group Limited | Information & communication | 2025 |
| Research & Insights Ltd. | Information & communication | 2016 |
| Reset Corporation Ltd | Manufacturing | 2020 |
| Reset Minds Therapies Ltd | Health & social care | 2014 |
| Reshape Your Mind Psychotherapy Limited | Health & social care | 2022 |
| Reship (UK) Logistics Services Limited | Administrative & support | 2007 |
| Residential Building Solutions (Party Wall) Ltd | Professional & scientific | 2015 |
| Residential Building Solutions Developments Ltd | Construction | 2017 |
| Residential Building Solutions Ltd | Professional & scientific | 2014 |
| Residia Properties Limited | Real estate | 2007 |
| Resilientresource Ltd | Information & communication | 2023 |
| Resoil Systems Ltd | Other services | 2023 |
| Resonance EAR Care Ltd | Health & social care | 2025 |
| Resonate, Audio Visual & Event Hire Ltd | Wholesale & retail | 2024 |
| Resort Life UK Ltd | Administrative & support | 2026 |
| Resource Advantage Limited | Professional & scientific | 2010 |
| Resources Control Limited | Construction | 2015 |
| Resources Productivity Management Limited | Professional & scientific | 1985 |
| Responsa Ltd | Professional & scientific | 2019 |
| Response Direct Post Ltd | | 2009 |
| Responsetap Limited | Information & communication | 2008 |
| Responsible Events Limited | Administrative & support | 2017 |
| Responsible Recruitment Ltd | Extraterritorial | 2006 |
| Restaurant Solutions Ltd | Manufacturing | 2015 |
| Restoration Assembly Ltd | Other services | 2022 |
| Restoration Property 1 Limited | Real estate | 2020 |
| Restoration Property Limited | Real estate | 2019 |
| Restore Consultancy Ltd | Professional & scientific | 2021 |
| Restore Global Academy Ltd | Education | 2025 |
| Restoria Classics Ltd | Wholesale & retail | 2019 |
| Restoria Limited | Wholesale & retail | 1992 |
| Results Base Limited | Arts & recreation | 2014 |
| Resurge Growth Partners LLP | | 2023 |
| Resz Limited | Information & communication | 2018 |
| Retail Invasion Limited | Wholesale & retail | 2024 |
| Retail Pharma 1 Ltd | Wholesale & retail | 2026 |
| Retail Project Services (UK) Limited | Professional & scientific | 2006 |
| Retail Results Limited | Wholesale & retail | 2003 |
| Retail Shops 2020 Limited | Wholesale & retail | 1975 |
| Retail Technology Services Ltd | Information & communication | 2002 |
| Retailguard AI Ltd | Construction | 2026 |
| Retained Reflexes Limited | Other services | 2019 |
| Retec Technology (UK) Limited | Information & communication | 2006 |
| Rethink Lighting Ltd | Construction | 2014 |
| Retirement Income Ltd | Extraterritorial | 2014 |
| Retrade Limited | Manufacturing | 2006 |
| Retro Commercial Training Ltd | Education | 2018 |
| Retro Frank Limited | Wholesale & retail | 2018 |