| Redecor (Painting Contractors) Limited | Wholesale & retail | 1974 |
| Redeemed Christian Church of GOD the Chapel of Courage | Other services | 2019 |
| Redehills Ltd | Information & communication | 2018 |
| Redemption Hour Ministries Ltd | Administrative & support | 2001 |
| Redgate Property Services Limited | Construction | 2003 |
| Redman Hope Consulting Ltd. | Information & communication | 2006 |
| Redoak Ventures Limited | Real estate | 2026 |
| Redshield Limited | Construction | 1981 |
| Redspice Limited | Real estate | 2007 |
| Redspot Care Holdings Limited | Financial services | 2019 |
| Redspot Healthcare Services Limited | Health & social care | 2013 |
| Redstar Healthcare Limited | Health & social care | 2006 |
| Reece Surfacing Limited | Construction | 2025 |
| Reed Residential Ltd | Real estate | 2007 |
| Reede Properties Limited | Real estate | 2024 |
| Reem London Ltd | Real estate | 2021 |
| Rees Furniture & Beds Ltd | Wholesale & retail | 2003 |
| Reeswood Services Limited | Households | 1999 |
| Reeve & SON (Maldon) Limited | Wholesale & retail | 1965 |
| Reeves & Spencer Engineering Limited | | 1977 |
| Refurbishment and Building Limited | | 1986 |
| Regal Media Press Limited | Professional & scientific | 2026 |
| Regents Park F.C. Limited | Arts & recreation | 2006 |
| Regional Properties (Cambridge) Ltd. | Professional & scientific | 1971 |
| Regnum Group Ltd | Real estate | 2024 |
| Rehaa Ltd | Wholesale & retail | 2024 |
| Rehoboth Gold Holdings Limited | Information & communication | 2024 |
| Reichsilver Ltd | Wholesale & retail | 2025 |
| Reilly Property Ltd | Real estate | 2024 |
| Reine Homes Ltd | Health & social care | 2022 |
| Reinvent U Homes Ltd | Real estate | 2021 |
| Reisap Ltd | Wholesale & retail | 2026 |
| Rekla Ltd | Information & communication | 2024 |
| Relaxblends Ltd | Wholesale & retail | 2024 |
| Reliable Domestic Appliances Limited | Manufacturing | 2006 |
| Reliance Aviation Limited | Administrative & support | 2017 |
| Reliance Garage (Leigh) Limited | Wholesale & retail | 1963 |
| Reliatek Limited | Wholesale & retail | 2024 |
| Relichunters Ltd | Wholesale & retail | 2025 |
| Relocate Stay Ltd | Administrative & support | 2025 |
| Remtech Automation Ltd | Professional & scientific | 2007 |
| Renew Counselling Ltd. | Education | 2000 |
| Renica Limited | Information & communication | 2006 |
| Renoj Limited | Information & communication | 2015 |
| Renorent Estates Limited | Real estate | 2024 |
| Rent a Property Ltd | Real estate | 2019 |
| Replication Centre Limited | Information & communication | 2008 |
| Research Report Limited | | 1981 |
| Reshaped Construction Ltd | Construction | 2026 |
| Resincraft Limited | Construction | 2000 |
| Resonance Counselling & Psychotherapy Ltd | Professional & scientific | 2025 |
| Response Law Ltd | Professional & scientific | 2025 |
| Restaurant 1 Ltd | Hospitality | 2022 |
| Restored Health Consults Ltd | Health & social care | 2025 |
| Restorex 2000 Limited | Professional & scientific | 1997 |
| Reta Holdings Limited | Financial services | 2025 |
| Retail Development Instore Ltd | Manufacturing | 1998 |
| Retreatu Ltd | Hospitality | 2026 |
| Retro Fashion Sense Limited | Wholesale & retail | 2018 |
| Reunion Media Ltd | Information & communication | 2023 |
| Revcore AI Limited | Information & communication | 2026 |
| Revelation Holdings Ltd | Health & social care | 2022 |
| Revermont Investments Ltd | Wholesale & retail | 2023 |
| Review Properties (Rayleigh) Limited | Real estate | 1974 |
| Revolve Reach Ltd | Wholesale & retail | 2025 |
| Rewarded Properties Ltd | Real estate | 2018 |
| REX Venture Resources Limited | Financial services | 2007 |
| Rexfox Tech Ltd | Information & communication | 2025 |
| RGH Building Services Limited | Administrative & support | 2003 |
| Rgprl Ltd | Information & communication | 2025 |
| RHA Print and Packaging Limited | Manufacturing | 2007 |
| RHC Europe LLP | | 2007 |
| Rhode Property Limited | Real estate | 2024 |
| Rholab Ltd | Information & communication | 2013 |
| RHY Design & Build Limited | Wholesale & retail | 2002 |
| Rhythmic Property Relocation Ltd | Real estate | 2022 |
| Rhythmic Skills UK Limited | Education | 2021 |
| Rich Almond (UK) Limited | Wholesale & retail | 2013 |
| Rich Fittings A/C Ltd | Construction | 2024 |
| Richard Gilbert | | 1993 |
| Richard Hopkins French Polishers Limited | Other services | 2007 |
| Richard Percy Limited | Professional & scientific | 2025 |
| Richardson Communications (UK) Limited | Information & communication | 2014 |
| Richmond (A.S.) Limited | Wholesale & retail | 1993 |
| Richmond Consultancy Limited | Agriculture & fishing | 2004 |
| Richris Limited | Extraterritorial | 2003 |
| Ricks Enterprises Ltd | Real estate | 2003 |
| Ricks Properties Ltd | Real estate | 1996 |
| Rico (UK) Ltd | Real estate | 1998 |
| Ride on Railways Limited | Manufacturing | 2002 |
| Ridgell & Guildway Accountants Limited | Professional & scientific | 2004 |
| Rigas Worldwide Limited | Wholesale & retail | 2026 |
| Righi Services Ltd | Administrative & support | 2026 |
| Right Solutions Ltd | Professional & scientific | 2007 |
| Rigidring Limited | | 1980 |
| Rigonometry Properties Ltd | Real estate | 2018 |
| Rihama Logistics Cargo Ltd | Transport & logistics | 2026 |
| Riimi Surg Ltd. | Wholesale & retail | 2024 |
| Rila Tech Limited | Information & communication | 2022 |
| Rinaldi Financial Services Limited | Administrative & support | 2007 |