| Richmond Environmental Services Limited | Construction | 2013 |
| Richmond Farm Mews Limited | Households | 1992 |
| Richmond Reclamation Holdings Ltd | Water & waste | 2017 |
| Richmond Reclamation Ltd | Water & waste | 2017 |
| Richness Ltd | Wholesale & retail | 2025 |
| Richtech Limited | Wholesale & retail | 2019 |
| Rick Haulage Ltd | Water & waste | 2026 |
| Rick Parker Limited | Construction | 2012 |
| Rick's Continental Ltd | Wholesale & retail | 2019 |
| Ricson Mechanical Electrical Ltd | Construction | 2019 |
| Riddington Legal Services Limited | Professional & scientific | 2025 |
| Riddle ME This Ltd | Professional & scientific | 2016 |
| Ride Decals Ltd | Manufacturing | 2019 |
| Ride Prestige Ltd | Transport & logistics | 2025 |
| Rides R US UK Ltd | Wholesale & retail | 2022 |
| Rides Riding School Ltd | Education | 2024 |
| Ridge and Ellison Ltd | Wholesale & retail | 2016 |
| Ridge Court Lessees Limited | Households | 1974 |
| Ridgemount Management Company Limited | Households | 2018 |
| Ridgeway Environmental Limited | Water & waste | 2004 |
| Ridgeway Inns Limited | Hospitality | 1999 |
| Ridgeway Thompson & Associates Ltd | Financial services | 2015 |
| Rifm Global Ltd | Transport & logistics | 2023 |
| Right Build Developments Ltd | Construction | 2021 |
| Right MIX Concrete Limited | Manufacturing | 2006 |
| Right Room 4 U Limited | Information & communication | 2013 |
| Right Strategy Ltd | Professional & scientific | 2012 |
| Right Talent LAB Limited | Transport & logistics | 2023 |
| Right Track Advisory Ltd | Real estate | 2025 |
| Rightangle Learning Limited | Professional & scientific | 1998 |
| Rightframe Holdings Limited | Financial services | 2019 |
| Rightframe Installations Limited | Extraterritorial | 2019 |
| Rights Asset Management Ltd | Information & communication | 2018 |
| Rights Evaluation Studio Ltd | Professional & scientific | 2020 |
| Rihla Stays Ltd | Administrative & support | 2025 |
| Rikabad Holdings Limited | Real estate | 2026 |
| Rileys Boxing & Fitness Centre Ltd | Arts & recreation | 2024 |
| Rina George Surgery Ltd | Health & social care | 2025 |
| Ring Rolled Products Limited | Professional & scientific | 1942 |
| Ringinglow Solutions Ltd | Real estate | 2024 |
| Ringinglow Ventures Ltd | Hospitality | 2010 |
| Ringside World Ltd | Administrative & support | 2012 |
| Rinnemakeovers Ltd | Other services | 2024 |
| Rinri Therapeutics Limited | Professional & scientific | 2018 |
| Rinse & DRY Limited | Administrative & support | 2023 |
| RIO Weight Management Limited | Health & social care | 2008 |
| Rios Barber Ltd | Other services | 2025 |
| Ripley Limited | Administrative & support | 2013 |
| Ripley Villas Limited | Real estate | 2023 |
| Ripples International Limited | Manufacturing | 2026 |
| Rippling Ideas Ltd | Education | 2025 |
| Rippon & Dean Limited | Real estate | 1947 |
| Riqa Ltd | Professional & scientific | 2016 |
| Risco Roofing and Seamless Aluminium Guttering Ltd | Manufacturing | 2019 |
| Rise Investment Group Limited | Real estate | 2026 |
| Rise Online Coaching Ltd | Arts & recreation | 2024 |
| Rise Properties SY Ltd | Real estate | 2025 |
| Rise Tech Equipment Ltd | Manufacturing | 2025 |
| Riseproject Global Ltd | Professional & scientific | 2024 |
| Risetalent Global Recruitment Ltd | Administrative & support | 2023 |
| Risewell Group Limited | Health & social care | 2025 |
| Rishe Supermarket Limited | Wholesale & retail | 2004 |
| Rising Folks Ltd | Information & communication | 2016 |
| Rising Steps Living CIC | Real estate | 2025 |
| Rising Steps Supported Housing Ltd | Real estate | 2025 |
| Rising Sun (DP) Limited | Hospitality | 2019 |
| Rising Sun Overlanders Ltd | Wholesale & retail | 2026 |
| Rising Together Housing Group Ltd | Construction | 2025 |
| RISK2VALUE Limited | Financial services | 2004 |
| Riskwise Limited | Information & communication | 2024 |
| Risqly Ltd | Professional & scientific | 2025 |
| Risward Ltd | Professional & scientific | 2022 |
| Rita's Building and Property Maintenance Limited | Construction | 2025 |
| Rite Turn Limited | Education | 2011 |
| Ritetrax Records Community Interest Company | Information & communication | 2015 |
| Ritth Ltd | Financial services | 2026 |
| Ritual Tattoo & Coffee Ltd | Hospitality | 2025 |
| Rivarm Ltd | Wholesale & retail | 2024 |
| Rivelin Consulting Limited | Professional & scientific | 2018 |
| Rivelin Counselling and Wellbeing Services Ltd | Health & social care | 2023 |
| Rivelin ERP Consulting Limited | Information & communication | 2024 |
| Rivelin Garden & Landscapes Limited | Administrative & support | 2026 |
| Rivelin Hotel Limited | Hospitality | 2018 |
| Rivelin Joinery Limited | Construction | 2010 |
| Rivelin Mechanical Services Limited | Construction | 2003 |
| Rivelin Rail Limited | Professional & scientific | 2023 |
| Rivelin Robotics Limited | Manufacturing | 2018 |
| Rivelin Valley Properties Limited | Real estate | 2018 |
| Rivelin Ventures Ltd | Professional & scientific | 2026 |
| Rivelin View Management Limited | Households | 2003 |
| Rivelinco Creative | Education | 2021 |
| River Cruise Films UK Limited | Information & communication | 2023 |
| River DON Properties Limited | Real estate | 1999 |
| River Effra Music Limited | Information & communication | 2018 |
| River Sheaf Car Wash Ltd | Other services | 2025 |
| River Stewardship Company Limited | Administrative & support | 2008 |
| Riverbank Exotic Wood Limited | Manufacturing | 2023 |
| Riverdale Freehold Limited | Real estate | 2021 |
| Riverdale Grange Properties Limited | Professional & scientific | 2014 |
| Riverdale House Freehold Ltd | Households | 2024 |