| Rapidocarto Limited | Wholesale & retail | 2025 |
| Rapss Ltd | Wholesale & retail | 2025 |
| Rapture LDN Ltd | Professional & scientific | 2026 |
| Rashedi Group Limited | Financial services | 2025 |
| Ravenopm Ltd | Wholesale & retail | 2025 |
| Ravensbourne Lodge Freehold Limited | Households | 2016 |
| Ravenscourt 1965 Limited | Extraterritorial | 2013 |
| Ravraj Limited | Wholesale & retail | 2019 |
| RAW Print Solutions Ltd | Manufacturing | 2012 |
| Raymond Paul Cannon Limited | Information & communication | 2012 |
| Razvan Building Ltd | Construction | 2025 |
| RB Therapies Ltd | Health & social care | 2020 |
| RBF Installations GBR Limited | Construction | 2015 |
| RBP Housing Ltd | Construction | 2025 |
| RC Deegans Ltd | Extraterritorial | 2024 |
| RCM Services and Management Ltd | Professional & scientific | 2017 |
| RD Atelier Limited | Professional & scientific | 2023 |
| RD Joinery Limited | Construction | 2025 |
| RDP Ventures Limited | Construction | 2018 |
| RDT Outsourcing Limited | Information & communication | 2017 |
| RDT Property Development Limited | Construction | 2026 |
| RE & RO Ltd | Construction | 2021 |
| React Sound Design Ltd | Professional & scientific | 2023 |
| REACTOR77 Ltd | Construction | 2017 |
| Ready to Clear IT Ltd | Water & waste | 2023 |
| Real Life 3D Limited | Information & communication | 2024 |
| Real Lifestyle Management Ltd | Real estate | 2025 |
| Realcorp Capital Limited | Financial services | 2017 |
| Realia Family Office Ltd | Administrative & support | 2024 |
| Realia Partners Limited | Real estate | 2022 |
| Realis Events Promotions Limited | Administrative & support | 2024 |
| Realistic Trading Group Ltd | Other services | 2026 |
| REALTY360 Ltd | Other services | 2018 |
| Rear Extensions Ltd | Construction | 2022 |
| Rebecca Reffell Consulting Ltd | Professional & scientific | 2026 |
| REC2 Recruitment Limited | Administrative & support | 2017 |
| Reco Genie Ltd | Information & communication | 2025 |
| Recruiterlink Limited | Administrative & support | 2018 |
| Recruitmentpass Ltd | Administrative & support | 2025 |
| Rector Construction Limited | Construction | 2006 |
| Red & Blue Lillies Limited | Health & social care | 2011 |
| Red Barbers Sidcup Ltd | Other services | 2018 |
| Red Hairdressing Orpington Limited | Other services | 2015 |
| Red Parrot Publishing Limited | Information & communication | 2011 |
| Red River Blue Limited | Professional & scientific | 2010 |
| Red Rocket Events Limited | Administrative & support | 2017 |
| Red Sandalwoods Limited | Hospitality | 2023 |
| Reddin Associates | Professional & scientific | 2007 |
| Redditch Limited | Real estate | 2006 |
| Redfields Landscaping & Design Limited | Other services | 1985 |
| Redgo Ltd | Other services | 2018 |
| Redhawk Consulting Limited | Professional & scientific | 2012 |
| Redi City Holdco a Ltd | Financial services | 2021 |
| Redi City Holdco B Ltd | Financial services | 2021 |
| Redi City Holdco C Ltd | Financial services | 2021 |
| Redi City Ltd | Financial services | 2020 |
| Redkafe Ventures Limited | Wholesale & retail | 2010 |
| Redlands Design & Development Ltd | Construction | 2022 |
| Redline Brickwork Midlands Limited | Construction | 2016 |
| Redpin Ltd | Wholesale & retail | 2018 |
| Redriff Trading Limited | Wholesale & retail | 2022 |
| Redspan Limited | Real estate | 2001 |
| Redstone Landscaping Ltd | Administrative & support | 2018 |
| Rees-Davies Education Consultancy Limited | Professional & scientific | 2019 |
| Reevamp Ltd | Information & communication | 2019 |
| Reevamp Properties Ltd | Real estate | 2021 |
| Reevamp Property Management Limited | Real estate | 2021 |
| Refax Systems Limited | Wholesale & retail | 1988 |
| Reflective Health Creation Ltd | Information & communication | 2026 |
| Reflex Apartments (Bromley) RTM Company Limited | Real estate | 2015 |
| Reform Teaching Academy Ltd | Arts & recreation | 2024 |
| Regal Care Trading Ltd | Health & social care | 2012 |
| Regal Rapids Ltd | Manufacturing | 2026 |
| Regal Trading Ltd | Health & social care | 2014 |
| Regency Joinery Works Ltd | Construction | 2026 |
| Rehab Corner Ltd | Extraterritorial | 2025 |
| Rehmet Properties Limited | Real estate | 2023 |
| Reify Solutions Ltd | Information & communication | 2024 |
| Rejuven Limited | Real estate | 2004 |
| Relative Groundwork Limited | Construction | 2002 |
| Relax and Recover Limited | Arts & recreation | 2026 |
| Relax of High Wycombe Ltd | Manufacturing | 2019 |
| Reliable Elevators Ltd | Other services | 2025 |
| Reliable Transport UK Limited | Transport & logistics | 2019 |
| Reloadedfun Ltd. | Wholesale & retail | 2020 |
| Renelm Roofing & Leadworks Ltd | Construction | 2023 |
| Rentadinosaur Ltd | Information & communication | 2000 |
| Replevin Ventures Limited | Professional & scientific | 2021 |
| Replikate Ltd | Professional & scientific | 2020 |
| Repreact Ltd | Manufacturing | 2025 |
| Reserviceua Limited | Transport & logistics | 2025 |
| Resicom Investments Limited | Real estate | 2019 |
| Residents of 111 Arngask Road Limited | Households | 2017 |
| Resilient Property Investments Limited | Real estate | 2021 |
| Resin Kng's Flooring Ltd | Construction | 2025 |
| Resolut Business Solutions (RBS) UK Ltd | Information & communication | 2025 |
| Resolute Media Studio Ltd | Professional & scientific | 2025 |
| Respscare Limited | Health & social care | 2024 |
| Retail Media Associates Ltd | Professional & scientific | 2025 |
| Retention Release Ltd | Administrative & support | 2006 |