| Release Ltd | Health & social care | 2001 |
| Reliable Work Force Ltd | Wholesale & retail | 2014 |
| Reliant Colour Solutions Ltd | Manufacturing | 2002 |
| Relish Clothing Limited | Manufacturing | 2011 |
| Relocation Support Services Limited | Transport & logistics | 2002 |
| Rematch STM Ltd | Arts & recreation | 2018 |
| Remote Jobs Ltd | Administrative & support | 2020 |
| Remsa Swimwear Limited | Wholesale & retail | 2022 |
| REN Cube Ltd | Information & communication | 2020 |
| Renaissance Bespoke Metal Work Limited | Manufacturing | 2024 |
| Renkel Property Limited | Real estate | 2017 |
| Rennen Legal Services Limited | Professional & scientific | 2022 |
| RENOV8 Estate Ltd | Real estate | 2019 |
| RENOVA8 Ltd | Construction | 2025 |
| Rensu Distribution Limited | Wholesale & retail | 1993 |
| Repala Construction Ltd | Construction | 2019 |
| Reptic Ltd | Information & communication | 2026 |
| Reset by Rekha Ltd | Other services | 2026 |
| Reside Property Solutions Ltd | Real estate | 2021 |
| Resilience Insights Ltd | Information & communication | 2022 |
| Resolv-E Regulatory Limited | Other services | 2024 |
| Resolve Holdings Limited | Financial services | 2024 |
| Resolvedevops Limited | Information & communication | 2017 |
| Resonance MBM Limited | Administrative & support | 2002 |
| Ress Damp and Condensation Prevention Ltd | Construction | 2022 |
| Restore Talent Solutions Limited | Administrative & support | 2025 |
| Rethink Management Consulting Ltd | Professional & scientific | 2025 |
| Retimac Limited | Information & communication | 2024 |
| Retirement & Investment Limited | Financial services | 2015 |
| Retreaders Requirements Limited | Wholesale & retail | 1974 |
| Retro Lemon Ltd | Wholesale & retail | 2020 |
| Revenue Acceleration Partners Ltd | Professional & scientific | 2026 |
| Revere Developments (Finchampstead Road) Ltd | Construction | 2023 |
| Revere Developments (Flackwell Heath) Limited | Construction | 2019 |
| Revere Developments (Lady Bray Farm) Ltd | Construction | 2022 |
| Revere Developments (ST James AVE) Ltd | Construction | 2022 |
| Revere Developments Limited | Construction | 2014 |
| Revert International Limited | Information & communication | 2008 |
| Reviewity Ltd | Public administration | 2023 |
| Revops Transformation Limited | Professional & scientific | 2025 |
| Revx Software Limited | Professional & scientific | 2020 |
| REX Bionics PLC | Administrative & support | 2007 |
| Reynold Rodrigues Ltd | Professional & scientific | 2025 |
| Reynolds Mateve Properties Ltd | Real estate | 2024 |
| Rezincote (1995) Limited | Professional & scientific | 1980 |
| RF Care Limited | Administrative & support | 2025 |
| RF Computers Limited | Wholesale & retail | 2006 |
| RG Gates Limited | Extraterritorial | 2016 |
| RGB Investments (Winchester) Limited | Real estate | 2016 |
| RGH Consultants Limited | Professional & scientific | 2013 |
| Rgkg Properties Limited | Real estate | 2024 |
| RGM Drmsolutions Ltd | Information & communication | 2011 |
| Rhiannon Roberts Ltd | Information & communication | 2025 |
| Rhodes James Associates Ltd | Professional & scientific | 2013 |
| RHP Bearings Europe Limited | Professional & scientific | 1988 |
| RHS EHR Solutions Ltd | Information & communication | 2022 |
| Rhubarb Street Limited | Wholesale & retail | 1990 |
| Rian Limited | Professional & scientific | 2019 |
| Ribbon Communications UK Limited | Information & communication | 2003 |
| Richard Brown Planning Limited | Professional & scientific | 2015 |
| Richard Clark Ltd | Other services | 2013 |
| Richard George Violin Limited | Arts & recreation | 2019 |
| Richard Global Goods Limited | Wholesale & retail | 2025 |
| Richfin Services Ltd | Professional & scientific | 2015 |
| Richinfo Limited | Real estate | 2013 |
| Richway Food and Wine Ltd | Wholesale & retail | 2020 |
| Rideflow Barakah Ltd | Transport & logistics | 2026 |
| Ridgeline Adventures Limited | Education | 2016 |
| Ridgwell Windows Ltd | Construction | 2022 |
| RIF Group Holdings Ltd | Professional & scientific | 2006 |
| RIF Logistics Limited | Administrative & support | 2008 |
| RIF Worldwide PLC | Transport & logistics | 2002 |
| Rifl Construction Ltd | Construction | 2023 |
| RIG & Run Ltd | Construction | 2025 |
| Right Kare Limited | Health & social care | 2012 |
| Rilsa Ltd | Administrative & support | 2026 |
| Rindt Vehicle Design Ltd | Manufacturing | 2017 |
| Ringdale Limited | Real estate | 1999 |
| Riosan Computing Solutions Ltd | Information & communication | 2015 |
| Rippledene Forensics Limited | Health & social care | 2010 |
| Rippon Beck Ltd | Professional & scientific | 2025 |
| Rise Stays Ltd | Real estate | 2026 |
| Riseup Digital Ltd | Information & communication | 2023 |
| Riskognition Limited | Professional & scientific | 2015 |
| Rissi Advisers Limited | Administrative & support | 2018 |
| Ritaje Company Ltd | Wholesale & retail | 2023 |
| Rite Price (Fruit & VEG) Limited | Wholesale & retail | 2019 |
| Riva Productions Limited | Manufacturing | 2002 |
| Rivelin Limited | Professional & scientific | 2018 |
| River Arts Collective CIC | Health & social care | 2025 |
| River Arts Observatory Limited | Health & social care | 2026 |
| River Corp AI Ltd | Information & communication | 2025 |
| River Gardens Management Company Limited | Real estate | 1987 |
| River Thames Music Academy Ltd | Education | 2022 |
| River Vista Health Ltd | Health & social care | 2024 |
| Riverborne Ltd | Construction | 2026 |
| Riverside Medical Systems Ltd | Other services | 2006 |
| Riverswale Productions Limited | Information & communication | 2019 |
| Rivertime Boat Trust Limited | Health & social care | 2005 |
| Rixon Lighting Ltd | Administrative & support | 2019 |