| Reliable Recruit Limited | Health & social care | 2016 |
| Relocating 4YOU Ltd. | Real estate | 2017 |
| Rely 1 Cars Ltd | Transport & logistics | 2025 |
| Remedicare Education Services Limited | Administrative & support | 2023 |
| Remedy RX Ltd | Professional & scientific | 2021 |
| Renaissance Associates Group (UK) Limited | Professional & scientific | 2021 |
| Renaissance Biology Limited | Professional & scientific | 2023 |
| Renew Earth Ltd | Professional & scientific | 2025 |
| Renovapro Limited | Construction | 2024 |
| Renovate Green Ltd | Construction | 2018 |
| Rent & Live Limited | Real estate | 2024 |
| Rentassured Ltd | Real estate | 2024 |
| Repairers Ltd | Other services | 2023 |
| Replica Biomaterials Ltd | Professional & scientific | 2023 |
| Replicable Limited | Information & communication | 2025 |
| Report UK Limited | Health & social care | 2007 |
| Repro 01 Ltd | Information & communication | 2019 |
| Repscout AI Ltd | Information & communication | 2017 |
| Repton Holdings Ltd | Real estate | 2024 |
| Residence Property Management Limited | Real estate | 2023 |
| Residual Carbon Limited | Professional & scientific | 2025 |
| Resilience Attire Ltd | Wholesale & retail | 2024 |
| Resonant Architecture Ltd | Professional & scientific | 2020 |
| Resonate Studio Ltd | Information & communication | 2022 |
| Resource Decisions Limited | Professional & scientific | 2007 |
| Response Organisation | Hospitality | 2003 |
| Restorativu Ltd | Information & communication | 2024 |
| Restore Building Maintenance Limited | Construction | 2024 |
| Restorit Ltd | Health & social care | 2019 |
| Restpaper Portfolio One Limited | Financial services | 2025 |
| RESULTS360 Limited | Professional & scientific | 2012 |
| Retail Compass Ltd | Information & communication | 2025 |
| Retro Van Cafe Bakery Limited | Manufacturing | 2025 |
| Reveco Ltd | Real estate | 2017 |
| Revelyne London Limited | Administrative & support | 2023 |
| Revenue Pilot Ltd | Professional & scientific | 2026 |
| Revenue Recovery Group Ltd | Information & communication | 2026 |
| Reverse Admissions Portal Ltd | Education | 2024 |
| Reverse Resources UK Limited | Information & communication | 2023 |
| Revive Driveways and Landscaping Ltd | Construction | 2025 |
| Revive Motor Sales Ltd | Wholesale & retail | 2025 |
| Revive Professional (Oxford) Limited | Administrative & support | 2018 |
| Revive Roofing and Building Ltd | Construction | 2026 |
| Revolutionary Innovations Limited | Health & social care | 2024 |
| Revrac Limited | Construction | 1998 |
| Rewaju Ltd | Wholesale & retail | 2025 |
| Rewley Park Management Company Limited | Households | 1997 |
| Rexhep Properties Limited | Real estate | 2016 |
| Reynard Consulting Services Limited | Professional & scientific | 2023 |
| RF Investment Solutions Ltd | Real estate | 2014 |
| RFA Advertising & Marketing Limited | Professional & scientific | 2010 |
| RFA Property Limited | Real estate | 2021 |
| RFI (Emea) Ltd | Information & communication | 2010 |
| RG Banbury Limited | Real estate | 2021 |
| RG Construction and Services Ltd | Construction | 2025 |
| RGI BUS & Coach Refurbishment Limited | Professional & scientific | 2016 |
| Rhodes House Limited | Real estate | 2008 |
| Riach Architects Limited | Professional & scientific | 2014 |
| Riccio Ltd. | Arts & recreation | 2018 |
| Rice Box Limited | Hospitality | 2011 |
| Richard Bauer Wash Associates Limited | Professional & scientific | 2014 |
| Richard Dawkins Limited | Arts & recreation | 2009 |
| Richard Pantlin Limited | Professional & scientific | 2011 |
| Richardson Associates Regulatory Affairs Limited | Professional & scientific | 2008 |
| Richfarm Oxford Ltd | Real estate | 2020 |
| Richmond Valley Limited | Wholesale & retail | 2016 |
| Rick's Vegetarian Ltd | Hospitality | 2017 |
| Ricks Cafe Ltd | Manufacturing | 2015 |
| Ricky Builders Limited | Construction | 2026 |
| Rida Reports Limited | Professional & scientific | 2017 |
| Ride to the MAX Ltd | Manufacturing | 2025 |
| Ridge Birmingham TC Limited | Real estate | 2023 |
| Ridge Cardiff TC Limited | Real estate | 2023 |
| Ridge EW TC Limited | Real estate | 2021 |
| Ridge Hayes TC Limited | Real estate | 2024 |
| Ridge Kangaroo Works TC Limited | Real estate | 2023 |
| Ridge Leeds TC Limited | Real estate | 2023 |
| Ridge Liverpool TC Limited | Real estate | 2023 |
| Ridge Manchester TC Limited | Real estate | 2023 |
| Ridge Oxford Ltd | Manufacturing | 2022 |
| Ridge PM Ltd | Households | 2022 |
| Ridge Salford TC Limited | Real estate | 2023 |
| Ridge Sherborne Wharf TC Limited | Real estate | 2024 |
| Ridge Soft Tissue Therapy Ltd | Education | 2025 |
| Ridgeback Properties Limited | Real estate | 2002 |
| Ridgefield Consulting Limited | Professional & scientific | 2010 |
| Ridgemont Close Residents Association Limited | Households | 1972 |
| Ridgeway (East Hendred) Management Company Limited | Real estate | 2017 |
| Ridgeway Ecotox & Risk Assessment Ltd | Professional & scientific | 2013 |
| Rift Valley Research Limited | Professional & scientific | 2001 |
| Rigginology Ltd | Construction | 2011 |
| Right Angle Photography Limited | Professional & scientific | 2020 |
| Right for YOU Ltd | Administrative & support | 2019 |
| Right Honourable Company of Merchants of Hong Kong Trading in Britain Limited | Wholesale & retail | 2025 |
| Right Tile Ltd | Information & communication | 2023 |
| Righton Group Limited | Hospitality | 2005 |
| Rightsource Solutions Ltd | Administrative & support | 2010 |
| Rila Holdings Limited | Real estate | 2022 |
| Rina Renovations Limited | Construction | 2023 |
| Ringrose Tree Services Ltd | Agriculture & fishing | 2005 |