| R I and L Limited | Information & communication | 2017 |
| R L Ferreira Ltd | Professional & scientific | 2019 |
| R M H Scenery Ltd | Construction | 2017 |
| R&L Futures Limited | Other services | 2026 |
| R.J. Property Co. (Ilford) Limited | Real estate | 1955 |
| RA International Europe Limited | Professional & scientific | 2005 |
| Rabars Barbers a Ltd | Other services | 2024 |
| Rachel Meinke Ltd | Other services | 2023 |
| Racking Construction Ltd | Construction | 2026 |
| RAD Electrical Ltd | Construction | 2020 |
| Radash Ltd | Real estate | 2025 |
| Radeklabs Ltd | Information & communication | 2025 |
| Radha Surrey Limited | Public administration | 2015 |
| Radiant Care Limited | Health & social care | 2010 |
| Radio Jackie Limited | Information & communication | 1992 |
| Rae-Matt Consulting Limited | Information & communication | 2024 |
| Raeburn Avenue Limited | Real estate | 2024 |
| Raeburn Limited | Wholesale & retail | 2025 |
| Raewood Projects Ltd | Professional & scientific | 2026 |
| Raft Investment Properties Ltd | Real estate | 2021 |
| RAJ Cash & Carry Limited | Wholesale & retail | 2026 |
| Raja-Helm Limited | Health & social care | 2025 |
| Rajpoot Group Limited | Wholesale & retail | 2024 |
| Raju Pandya Ltd | Other services | 2012 |
| Rakitzis Ltd | Professional & scientific | 2016 |
| RAM Food & Wine UK Limited | Wholesale & retail | 2016 |
| Rami Property Services Ltd | Construction | 2021 |
| Ramovale Limited | Households | 1984 |
| Ramu (UK) Ltd | Health & social care | 2014 |
| Ramunas Valancius Ltd | Construction | 2014 |
| Randall House Management Company Limited | Households | 2012 |
| Ranger Trading Post Ltd | Wholesale & retail | 2024 |
| RAS Traders Ltd | Other services | 2018 |
| Rasoha Trans Ltd | Transport & logistics | 2025 |
| Rate Your Kicks Ltd | Information & communication | 2022 |
| Ratu Bagus International | Administrative & support | 2011 |
| Raven Brickwork Ltd | Construction | 2018 |
| Ravvans Ltd | Wholesale & retail | 2019 |
| Rayala IT Ltd | Information & communication | 2025 |
| Rayyan Enterprises Ltd | Wholesale & retail | 2020 |
| RBA Commerce Ltd | Wholesale & retail | 2023 |
| RBR Surbiton Ltd | Hospitality | 2024 |
| RD Harris Electrical Limited | Energy | 2008 |
| Rdtoz Ltd | Arts & recreation | 2025 |
| Really Useful Kitchen Ltd | Wholesale & retail | 2015 |
| Realty 2 Venture Ltd | Real estate | 2020 |
| Rearden-Cord Limited | Administrative & support | 1975 |
| Recap AV Ltd | Financial services | 2015 |
| Recherche International Ltd | Construction | 2020 |
| Recommend Recruitment Ltd | Administrative & support | 2013 |
| Recon Accountants Ltd | Professional & scientific | 2025 |
| Red Face Films Ltd | Information & communication | 2023 |
| Red Lion Auto & MOT Centre Ltd | Wholesale & retail | 2020 |
| Red Lion MOT & Repair Ltd | Wholesale & retail | 2015 |
| Red Spider Climbing Limited | Arts & recreation | 2015 |
| Redbird Collaborative CIC | Information & communication | 2026 |
| Redbird Productions Ltd | Information & communication | 1991 |
| Redbridge Kingswood UK Limited | Construction | 2026 |
| Redcon Limited | Construction | 2005 |
| Redfern Management Company Limited | Households | 1984 |
| Redr UK | Other services | 2000 |
| Redr UK Trading Limited | Administrative & support | 2010 |
| Redreel Limited | Real estate | 1981 |
| Redro Tech Ltd | Information & communication | 2025 |
| Redy Limited | Other services | 2021 |
| Reflectionaire Events Ltd | Professional & scientific | 2026 |
| Regal House Property Limited | Real estate | 2026 |
| Regal MM Limited | Real estate | 2024 |
| Regal Touch Millinery Ltd | Manufacturing | 2023 |
| Regen Athletics Ltd | Wholesale & retail | 2025 |
| Regency Bookshop Ltd | Wholesale & retail | 2020 |
| Regency Drycleaners (UK) Limited | Other services | 2004 |
| Regency Holdings Limited | Transport & logistics | 2015 |
| Regency House 1887 Ltd | Households | 2011 |
| Regent Marks Accountancy Ltd | Professional & scientific | 2018 |
| Regent Marks Limited | Real estate | 2018 |
| Reinvserv AM Ltd | Real estate | 2017 |
| Rejuvenation Holistic Massage Therapy Ltd | Other services | 2017 |
| Release Your Golf Ltd | Education | 2025 |
| Reliable Building Services Limited | Construction | 2010 |
| Remfore Ltd | Information & communication | 2010 |
| Remmy Care Ltd | Health & social care | 2022 |
| Rene Care Limited | Health & social care | 2014 |
| Renova Consulting Engineers Limited | Administrative & support | 2020 |
| Renova Structural Survey Ltd | Professional & scientific | 2026 |
| Renova Studio Ltd | Real estate | 2026 |
| Renovation Brothers Ltd | Real estate | 2018 |
| Renshaw Liverpool Property Limited | Real estate | 2026 |
| Rentcheck Ltd | Households | 2020 |
| Reorderly Ltd | Other services | 2026 |
| Repairex Ltd | Information & communication | 2023 |
| Replumd Ltd | Construction | 2026 |
| Resin Ways Ltd | Construction | 2019 |
| Restart Consultancy Solutions Limited | Other services | 2021 |
| Restore Civils Ltd | Construction | 2022 |
| Returnstance Property Management Limited | Households | 1998 |
| Revbeam Ltd | Information & communication | 2016 |
| Reviresco Technologies Limited | Information & communication | 2005 |
| Revive Physiotherapy Ltd | Health & social care | 2016 |
| Revive Skin & Beauty Centre Limited | Other services | 2015 |