| RDT Investments Limited | Real estate | 2018 |
| RDZ Consultancy 1 Ltd | Professional & scientific | 2025 |
| React Project CIC | Professional & scientific | 2021 |
| Real Estate Forecasting Limited | Administrative & support | 2000 |
| Realability Limited | Hospitality | 2023 |
| Reardon Consultancy Limited | Public administration | 2025 |
| REB Productions Limited | Arts & recreation | 1992 |
| Rebase Ventures Limited | Financial services | 2020 |
| Rebecca Parry Limited | Health & social care | 2021 |
| Rebecca Whippy Send Consultants Ltd | Education | 2021 |
| Rebel Engineers Ltd | Professional & scientific | 2025 |
| Rebourne Construction Ltd | Construction | 2022 |
| Rebourne Developments Limited | Real estate | 2024 |
| Receipt Lottery Ltd | Professional & scientific | 2016 |
| Recovery Headquarters Ltd | Health & social care | 2025 |
| Recruitment South East Limited | Administrative & support | 2011 |
| Recursive Design Studio Limited | Professional & scientific | 2025 |
| Red Chillies Indian Cuisine Limited | Hospitality | 2023 |
| Red Dangelo Limited | Professional & scientific | 2016 |
| Red Flump Ltd | Real estate | 2025 |
| Red FOX Marketing Ltd | Other services | 2022 |
| Red Kite Legal Consultants Limited | Professional & scientific | 2023 |
| Red Point Recruitment Ltd | Administrative & support | 2016 |
| Red Sea Group UK Limited | Financial services | 2026 |
| Red Sea Stores Ltd | Wholesale & retail | 2020 |
| Red Sphere Holdings Limited | Financial services | 2014 |
| Reda Residential Ltd | Real estate | 2026 |
| Redbreast Ecology Ltd | Professional & scientific | 2024 |
| Redford Residents Association (Bexhill) Limited | Real estate | 1989 |
| Redfox Worldwide Limited | Other services | 2016 |
| Redgold Limited | Wholesale & retail | 1993 |
| Redkyte Ltd | Information & communication | 2015 |
| Redox Lifestyle Limited | Wholesale & retail | 2022 |
| Redray MGA (UK) Limited | Financial services | 2021 |
| Redstone Mansions Management Ltd | Households | 2002 |
| Redtops Construction Ltd | Construction | 2021 |
| Redwood Exhibitions Limited | Professional & scientific | 2018 |
| Redwood Productions | Arts & recreation | 2016 |
| Reel Bliss Films Ltd | Information & communication | 2024 |
| Reelnotes Ltd | Information & communication | 2026 |
| Reflection Glass Scratches Repairs Ltd | Construction | 2014 |
| Reformation Films Limited | Information & communication | 2022 |
| REFR3SH Ltd | Professional & scientific | 2021 |
| Regal Support Services Ltd | Professional & scientific | 2016 |
| Regc Trading Ltd | Arts & recreation | 2014 |
| Regency Property Management Services Ltd | Real estate | 2019 |
| Regenersoil Ltd | Agriculture & fishing | 2021 |
| Regents Court (Eastbourne) Management Company Limited | Real estate | 1995 |
| Regi 2013 Ltd | Hospitality | 2015 |
| Reid Geophysics Limited | Professional & scientific | 2003 |
| Reigate Dental Care Ltd | Extraterritorial | 2010 |
| Rejuvenation by Kiri Limited | Other services | 2021 |
| Relentless Hotel Investments Limited | Hospitality | 2016 |
| Relocation Property Management Limited | Real estate | 2026 |
| Renaissance Properties (UK) Limited | Real estate | 2006 |
| Renceries Ltd | Real estate | 2022 |
| RENOV8 Solutions Ltd | Construction | 2023 |
| Rent Ready Hmos Ltd | Real estate | 2024 |
| Rentwise Real Estate Ltd | Real estate | 2026 |
| Repairful Ltd | Manufacturing | 2020 |
| Requiem for the Living Ltd | Arts & recreation | 2021 |
| Resident Ventures Ltd | Wholesale & retail | 2023 |
| Residential Renovations and Refits Ltd | Construction | 2025 |
| Residential Renovations Ltd | Construction | 2015 |
| Residents Management (NO.34) Limited | Households | 1985 |
| Resolve Salvage & Fire (Europe) Ltd | Manufacturing | 2009 |
| Response Eco Ltd | Water & waste | 2011 |
| Resregen Limited | Professional & scientific | 2017 |
| Restaurants 4 Group Limited | Hospitality | 2023 |
| Rethink Priorities UK Ltd | Professional & scientific | 2023 |
| Returnfinal Property Management Limited | Households | 1994 |
| Revi Building Services Ltd | Construction | 2024 |
| Revi Lago Limited | Real estate | 2020 |
| Revivalsurveyors Ltd | Professional & scientific | 2025 |
| Revive Asset Partnership Limited | Real estate | 2019 |
| Revived Inns Limited | Hospitality | 2016 |
| Revolution Flowers Ltd | Wholesale & retail | 2020 |
| Rewerq Industrial Ltd | Construction | 2023 |
| Reydoog Ltd | Professional & scientific | 2004 |
| RFC Chicken & Ribs BN22 Ltd | Hospitality | 2025 |
| RG Rail Limited | Construction | 2019 |
| Rgmw Properties Ltd | Real estate | 2025 |
| RGN Prime UK Limited | Administrative & support | 2025 |
| RH Bespoke Wood Floors Ltd | Construction | 2014 |
| RH CNC Limited | Manufacturing | 2006 |
| Rhema Healthcare Ltd | Health & social care | 2017 |
| Rhino Medical Ltd | Health & social care | 2019 |
| Rhino Removal Services Limited | Transport & logistics | 2023 |
| Rhino Removals Ltd | Transport & logistics | 2015 |
| Rhobell Ltd | Professional & scientific | 2025 |
| Rhze Limited | Real estate | 2025 |
| Rich Nails & Spa Ltd | Other services | 2022 |
| Richard Brook Property Services Limited | Real estate | 2013 |
| Richard Russell Copywriter Ltd | Extraterritorial | 2019 |
| Richer Lives Limited | Professional & scientific | 2026 |
| Richie Davies Consultancy Limited | Professional & scientific | 2011 |
| Richie Health Care Ltd | Health & social care | 2015 |
| Rick Marr SFX Limited | Manufacturing | 2014 |
| Rickards Design Limited | Other services | 2020 |
| Ricker Restaurants Limited | Professional & scientific | 2004 |