| Quindex Limited | Financial services | 2006 |
| R & Q Solutions Ltd | Wholesale & retail | 2025 |
| R&M London Ltd | Construction | 2025 |
| R&P Investments Limited | Real estate | 2019 |
| R&S Plumbing Construction Innovation Ltd | Construction | 2021 |
| R.D. Holdings (London) Limited | Hospitality | 1986 |
| R4 Property Management Limited | Real estate | 2021 |
| RAA Assets Limited | Real estate | 2023 |
| Raaj Developments Limited | Construction | 2024 |
| RAD Drywall Ltd | Manufacturing | 2020 |
| Rad&Co Ltd | Construction | 2019 |
| Radiant Home Cleaners Limited | Administrative & support | 2025 |
| Radiant Prysm Limited | Professional & scientific | 2026 |
| Ragini and Co Limited | Real estate | 2024 |
| Ragu Estate Agents Limited | Real estate | 2002 |
| Ragu Estate Property Investment Ltd | Real estate | 2024 |
| RAJ Developments Limited | Real estate | 2012 |
| Ranger Consultancy Ltd | Professional & scientific | 2026 |
| Rapid Auto Assist Limited | Administrative & support | 2016 |
| Rapid Facilities Management Ltd | Administrative & support | 2021 |
| Ravway Limited | Construction | 2014 |
| RAY & Builder Ltd | Construction | 2026 |
| RAY Harris Design Limited | Construction | 2002 |
| Rayan Holding Limited | Real estate | 2017 |
| Rbkb Solutions Limited | Professional & scientific | 2021 |
| RC Soft Limited | Information & communication | 2022 |
| RC Sports Ltd | Wholesale & retail | 2026 |
| RCW Real Estate Ltd | Real estate | 2025 |
| RDS Properties Limited | Real estate | 2024 |
| Re-Integrate CIC | Hospitality | 2023 |
| Reach Tone Ltd | Construction | 2011 |
| Realistic Onsite Operational Training Limited | Administrative & support | 2024 |
| Reanimationuk Limited | Wholesale & retail | 2017 |
| Recall LDN Limited | Wholesale & retail | 2022 |
| Recpro Services Limited | Administrative & support | 2009 |
| Rectory Court (Loughton) Limited | Households | 1995 |
| Red Clarity Ltd | Information & communication | 2015 |
| Redbridge International Limited | Administrative & support | 2020 |
| Redfin Solutions Private Ltd. | Information & communication | 2013 |
| Regency Apartments (Chigwell) Management Company Limited | Households | 2013 |
| Regency Close Management Company Limited | Households | 1986 |
| Regpro Contractors Ltd | Professional & scientific | 2024 |
| Reignite Corporate Services Ltd | Administrative & support | 2025 |
| Reiss Scaffolding Ltd | Construction | 2013 |
| Renaissance Developments Ltd | Real estate | 2018 |
| Rentiko Ltd | Real estate | 2026 |
| Rexglobe Anderson Limited | Construction | 2014 |
| Reya's LAB Ltd | Wholesale & retail | 2025 |
| RFI Properties Ltd | Real estate | 2023 |
| RG Tradeco Limited | Financial services | 2021 |
| RGE Bidco Limited | Financial services | 2024 |
| RGE Holdco Limited | Financial services | 2024 |
| RGE Midco Limited | Financial services | 2024 |
| RGE Services Limited | Construction | 1997 |
| Ribb Ltd | Professional & scientific | 2020 |
| Right Track Trading Limited | Financial services | 2009 |
| Rikpel Properties Limited | Real estate | 2024 |
| Riley Plumbing & Heating Limited | Construction | 2020 |
| Rise and Shine Homes Ltd | Health & social care | 2025 |
| Rising PK Ltd | Wholesale & retail | 2024 |
| Riverbank Property Developments Limited | Construction | 2017 |
| Riverside Properties Barking Limited | Real estate | 2025 |
| Rivian Ventures Ltd | Financial services | 2026 |
| RJL & G Limited | Information & communication | 2025 |
| RK Building Services Ltd | Construction | 2020 |
| RK Group Line Ltd | Wholesale & retail | 2018 |
| RK Van Ltd | Transport & logistics | 2013 |
| RKR Care Ltd | Health & social care | 2025 |
| Rktc Properties Limited | Real estate | 2024 |
| Rmos Property Limited | Real estate | 1998 |
| RMP Coleridge Limited | Real estate | 2018 |
| RMP Prop (Holdings) Limited | Financial services | 2021 |
| RMP Prop Investments Limited | Real estate | 2016 |
| RMP Prop Limited | Financial services | 2013 |
| RMP Property Limited | Extraterritorial | 2019 |
| RO ENG Limited | Professional & scientific | 2025 |
| Robuk UK Limited | Health & social care | 2019 |
| Rockafella Properties Limited | Real estate | 2020 |
| Roconnect Ltd | Construction | 2016 |
| ROI Construction Ltd | Construction | 2024 |
| RONI22 Limited | Hospitality | 2024 |
| Rooms on Limited | Real estate | 2017 |
| Root Cause Health Ltd | Health & social care | 2024 |
| Roshni Property Limited | Real estate | 2025 |
| Rosie Roo's Cakes and Bakes Limited | Manufacturing | 2020 |
| Rosp Solutions Ltd | Manufacturing | 2024 |
| Routeflow Ltd | Construction | 2026 |
| Rowley Management Company Limited | Households | 1971 |
| Royale Reflections Limited | Wholesale & retail | 2026 |
| RPG Global Limited | Wholesale & retail | 2017 |
| RR GAS Limited | Construction | 2020 |
| RRR SPV Ltd | Real estate | 2024 |
| RSD Associates Limited | Real estate | 2017 |
| RTT Contracting Limited | Professional & scientific | 2026 |
| RTT Real Estate Limited | Real estate | 2025 |
| Rubycrest Estates Ltd | Real estate | 2023 |
| Rubysports Ltd | Wholesale & retail | 2025 |
| Rughoo Real Estate Limited | Financial services | 2020 |
| Rvsr Limited | Real estate | 2020 |
| Ryan Battles Consultants Limited | Information & communication | 2012 |