| R.A. Walton Limited | Transport & logistics | 1971 |
| R.I.M.E Properties Limited | Real estate | 2024 |
| R.I.M.E. Holdings Limited | Financial services | 2024 |
| R3G Finance Ltd | Financial services | 2016 |
| R3G Properties Limited | Real estate | 2021 |
| R3G Properties Woodcombe Ltd | Real estate | 2025 |
| Raad Investments Limited | Financial services | 2026 |
| Raad Properties Limited | Real estate | 2025 |
| Rabb Ltd | Financial services | 2020 |
| Rafiki Estates (Developments) Ltd | Construction | 2026 |
| Rafiq Sweet House Ltd | Manufacturing | 2024 |
| Rahmqvist UK Ltd. | Administrative & support | 1976 |
| RAK Corporate Ltd | Wholesale & retail | 2025 |
| RAM Property Rental Ltd | Real estate | 2020 |
| Ramex Corp Ltd | Wholesale & retail | 2018 |
| Ramvest Ltd | Real estate | 2026 |
| Rapid Aquatics Limited | Wholesale & retail | 2017 |
| Rashid AL Arabia Trading Ltd | Wholesale & retail | 2024 |
| Ravi Developments Limited | Real estate | 2005 |
| RBV Property Rentals UK Ltd | Real estate | 2020 |
| RBV Property UK Ltd | Real estate | 2020 |
| RCT Webdesigns Ltd | Information & communication | 2012 |
| Real Autotrader Ltd | Wholesale & retail | 2025 |
| Real Estate Van Buuren Ltd | Real estate | 2024 |
| Reawake Estate Ltd | Real estate | 2021 |
| Rebirth Recruitment Ltd | Administrative & support | 2019 |
| Reckoon Limited | Information & communication | 2014 |
| Rectory Court Care Home Limited | Financial services | 2017 |
| Red Box Teacher Recruitment Limited | Administrative & support | 2009 |
| Red Bricks and Mortar Properties Ltd | Real estate | 2024 |
| Red for JU UK Ltd | Real estate | 2019 |
| Red Sea Gate Trading Co. Ltd | Professional & scientific | 2023 |
| Redlum Ltd | Real estate | 2024 |
| Redman Tech Ltd | Information & communication | 2026 |
| Redmango Tech Solutions LLP | | 2023 |
| Redrock Property Group Ltd | Real estate | 2025 |
| Reelax Media Ltd | Manufacturing | 2025 |
| Reelistic Dreams Ltd | Professional & scientific | 2023 |
| Reencara Limited | Construction | 2013 |
| Regalair Ltd | Professional & scientific | 2024 |
| Regalis of London Limited | Transport & logistics | 2024 |
| Regi Investments Ltd | Real estate | 2024 |
| Reia Truck Parts Limited | Wholesale & retail | 2017 |
| Reigning Paradigms Limited | Administrative & support | 2010 |
| Reiz Invest Ltd | Real estate | 2023 |
| Relay Secure Systems Ltd | Construction | 2026 |
| Relf Audley Retirement Living II LLP | | 2019 |
| Relf Audley Retirement Living LLP | | 2019 |
| Rendlesham Estates Ltd | Construction | 1993 |
| Rendlesham Park Properties Limited | Financial services | 1997 |
| Renew Eco Fuel Solutions Ltd | Professional & scientific | 2015 |
| Renovastic Limited | Construction | 2024 |
| Rensom Capital Ltd | Other services | 2025 |
| Rental Claims Services Limited | Financial services | 2019 |
| Rentperk Ltd | Information & communication | 2026 |
| Repando Properties Ltd | Real estate | 2022 |
| Resurface Ltd | Information & communication | 2016 |
| Retail Bond Limited | Other services | 2024 |
| Retakiso Ltd | Other services | 2023 |
| Rethrive Ltd | Financial services | 2021 |
| Reus Property Investments Limited | Real estate | 2021 |
| Reval Real Estate Ltd | Real estate | 2025 |
| Revion Realty Ltd | Real estate | 2025 |
| Revived Hard Surface Restoration Ltd | Construction | 2022 |
| Revolugen Limited | Professional & scientific | 1998 |
| Rewinkel Real Estate Ltd | Real estate | 2025 |
| Rexston Limited | Wholesale & retail | 2019 |
| Rgee Limited | Wholesale & retail | 2015 |
| Rgga Limited | Real estate | 2017 |
| Rhijan Limited | Real estate | 2021 |
| Rhombus Real Estate Ltd | Real estate | 2025 |
| Rhos Cottage Dental Practice Limited | Health & social care | 2008 |
| Riasia Ltd | Wholesale & retail | 2025 |
| Ricea Invest Ltd | Real estate | 2024 |
| Richard Gort Property Ltd | Real estate | 2025 |
| Richstone Investments Limited | Real estate | 1999 |
| Richstone Procurement Limited | Professional & scientific | 2010 |
| Richstone Properties Construction Ltd | Administrative & support | 1996 |
| Richstone Properties Limited | Construction | 2014 |
| Ricigi Limited | Professional & scientific | 2015 |
| RIENSBERG100 Ltd | Financial services | 2021 |
| Rifin Ltd | Professional & scientific | 2023 |
| Right Track Property Investment Ltd | Real estate | 2021 |
| Right Track Property Trading Ltd | Real estate | 2021 |
| Rijnders Ltd | Real estate | 2025 |
| Rima Becketts Ltd | Real estate | 2025 |
| Rima Market Street Ltd | Real estate | 2025 |
| Rima Real Estate Holding Ltd | Financial services | 2025 |
| Rima Real Estate Ltd | Real estate | 2022 |
| Rimako Property Invest Ltd | Real estate | 2023 |
| Rimako Property Trade Ltd | Hospitality | 2023 |
| Riot Investments & Finance Corporation PLC | Financial services | 2018 |
| Riri Developments Limited | Construction | 2022 |
| Rise Developments Group Ltd | Construction | 2024 |
| Rissa Investments Limited | Real estate | 2019 |
| Rissington Media Publishing Ltd | Professional & scientific | 2024 |
| Rissmann Financial Group United Kingdom Ltd | Financial services | 2021 |
| Riverside Living Investments Ltd | Real estate | 2022 |
| RJA Invest Ltd | Real estate | 2024 |
| RKN Sohi Ltd | Real estate | 2026 |