| Rinse & Shine Limited | Administrative & support | 2018 |
| RIO Grande Meat Market Ltd | Wholesale & retail | 2022 |
| Rio's Hendon Ltd | Hospitality | 2026 |
| Rio's Piri Piri Ltd | Hospitality | 2013 |
| Rionm Ltd | Real estate | 2025 |
| Rios KSA Ltd | Hospitality | 2025 |
| Ripan Transport Services Ltd | Water & waste | 2020 |
| Ripples Security and Support Services Ltd | Administrative & support | 2024 |
| Risa Property Company Limited | Real estate | 2021 |
| Rise Aesthetics Ltd | Other services | 2017 |
| Rise Traders Ltd | Wholesale & retail | 2025 |
| Risiko Limited | Professional & scientific | 2015 |
| Rising Damp Limited | Construction | 1979 |
| Rising Ltd | Construction | 2018 |
| Rising Solutions Consultancy Ltd | Professional & scientific | 2013 |
| Risk Focused Consulting Ltd | Information & communication | 2012 |
| Risk Focused Ltd | Real estate | 2020 |
| Riskspotlight Holdings Ltd | Financial services | 2023 |
| Riskspotlight Limited | Professional & scientific | 2012 |
| Riso (U.K.) Limited | Manufacturing | 1992 |
| Ritcha Ltd | Construction | 2021 |
| Riteway Claims Limited | Information & communication | 2017 |
| Ritzmart Ltd | Wholesale & retail | 2017 |
| Rivaroma Limited | Real estate | 2020 |
| River Gardens Ltd | Professional & scientific | 2024 |
| Rivington Crescent (Mill Hill) Management Company Limited | Households | 1983 |
| RIX Holdings Ltd | Financial services | 2025 |
| Riya Consultancy Services Limited | Professional & scientific | 2013 |
| Riya Prakash Ltd | Health & social care | 2022 |
| Riyatech Limited | Information & communication | 2020 |
| Rize 360 Ltd | Professional & scientific | 2022 |
| RIZMART24 Limited | Wholesale & retail | 2026 |
| Rizqon Ltd | Wholesale & retail | 2026 |
| Rizz Agogo Ltd | Arts & recreation | 2024 |
| RJ Clarke Computing Services Ltd | Information & communication | 2021 |
| RJ UK Holdings Ltd | Real estate | 2024 |
| RJA Consultants and Tax Advisers Ltd | Administrative & support | 2016 |
| RJB Trading Limited | Professional & scientific | 1998 |
| RJH Designs Limited | Construction | 2013 |
| RJK Capital Ltd | Real estate | 2026 |
| Rjlc Properties Ltd | Real estate | 2021 |
| Rjrj Investment Limited | Financial services | 2025 |
| Rjrs Engineering Limited | Transport & logistics | 2014 |
| RJW Advisory Limited | Professional & scientific | 2010 |
| RJW Financial Limited | Financial services | 2005 |
| RK Learning & Consulting Limited | Information & communication | 2015 |
| RK Technology Limited | Information & communication | 2014 |
| RK81 Stores Ltd | Wholesale & retail | 2025 |
| Rkak Investments Limited | Real estate | 2025 |
| Rkbe Limited | Professional & scientific | 2021 |
| RKD Tune Ltd | Wholesale & retail | 2025 |
| RKJ Media Marketing Ltd | Information & communication | 2025 |
| RKJ Property Consultants Limited | Professional & scientific | 2014 |
| RKJ Surveys LLP | | 2021 |
| RKK Management Ltd | Real estate | 2018 |
| RKM Holdings Limited | Real estate | 2023 |
| Rkrf Ltd | Transport & logistics | 2019 |
| RKS Adventures Limited | Real estate | 2021 |
| RKS Global Trade Ltd | Wholesale & retail | 2025 |
| RKS Real Estate Ltd | Real estate | 2021 |
| Rksm Group Ltd | Wholesale & retail | 2025 |
| RL Harrison Limited | Wholesale & retail | 2025 |
| RL Retail Services Limited | Administrative & support | 1999 |
| Rlgs Maison Limited | Real estate | 2026 |
| RLS Gouda IT Consulting Ltd | Information & communication | 2016 |
| Rlvproject Limited | Information & communication | 2017 |
| RM Associates Limited | Professional & scientific | 1998 |
| RM Executive Ltd | Transport & logistics | 2025 |
| RM Holdco Ltd | Financial services | 2021 |
| RM80 Limited | Information & communication | 2018 |
| Rmac Consulting Limited | Professional & scientific | 2020 |
| RMB Site Services Ltd | Administrative & support | 2022 |
| RMD Bentley Limited | Health & social care | 2022 |
| RMD Cams Limited | Health & social care | 2023 |
| RMD Properties (London) LLP | | 2011 |
| RMD Westlands Limited | Health & social care | 2014 |
| Rmdf Investments Limited | Real estate | 2025 |
| Rmdf Limited | Other services | 2022 |
| Rmgs Pharma & Auditing Services Ltd | Professional & scientific | 2022 |
| RMI Transport Ltd | Transport & logistics | 2021 |
| RMT Exclusive Auto Services Ltd | Wholesale & retail | 2022 |
| RMW FCS Limited | Professional & scientific | 2019 |
| RMW Systems Ltd | Professional & scientific | 2024 |
| RN Invest Ltd | Wholesale & retail | 2022 |
| RN Management Services Limited | Real estate | 2017 |
| RN Wealth Group Limited | Real estate | 2018 |
| RNK Diagnostics Ltd | Health & social care | 2026 |
| RNR Investments Limited | Wholesale & retail | 2015 |
| Rnrk Limited | Professional & scientific | 2022 |
| RNS Business Consultancy Limited | Professional & scientific | 2014 |
| RO Plant Ltd | Construction | 2014 |
| ROA Holdings Ltd | Financial services | 2025 |
| Road Communications Limited | Administrative & support | 2006 |
| Road Haulage Transport Ltd | Water & waste | 2017 |
| Road Media Pass Limited | Information & communication | 2023 |
| Road Tech Computer Systems Limited | Information & communication | 1986 |
| Road Tech Holdings Limited | Financial services | 2016 |
| Roadsense Ltd | Extraterritorial | 2012 |
| ROB Building Services Ltd | Construction | 2023 |
| ROB Whalley & Sons Ltd | Agriculture & fishing | 2006 |