| Repro Limited | Real estate | 2018 |
| Reproductive Immunology Centre Limited | Households | 2004 |
| Repton Park (13B) Management Company Limited | Households | 2012 |
| Repton Park (16) Management Company Limited | Households | 2012 |
| Repton Park (26) Management Company Limited | Households | 2011 |
| Repton Park (28) Management Company Limited | Households | 2011 |
| Repton Park (30) Management Company Limited | Households | 2013 |
| Required Labels Ltd | Wholesale & retail | 2022 |
| Rerani Limited | Wholesale & retail | 2024 |
| RES Divitiae Limited | Real estate | 2020 |
| Rescue Club Ltd | Administrative & support | 2025 |
| Research Alternatives Consultancy Management Limited | Professional & scientific | 2019 |
| Research and Event Solutions Limited | Professional & scientific | 2012 |
| Resect Engineering Limited | Construction | 2011 |
| Resell IT Ltd | Information & communication | 2025 |
| Residents Management (NO.2) Limited | Households | 1985 |
| Resin Bond London Ltd | Construction | 2026 |
| Resolute Focus Media Limited | Information & communication | 2013 |
| Resolute Trading Company Ltd | Education | 2017 |
| Resolvance Ltd | Professional & scientific | 2026 |
| Resonate (Clapham Road) Management Company Limited | Real estate | 2012 |
| Responsiclean Ltd | Administrative & support | 2014 |
| Responsive Roofing Ltd | Construction | 2021 |
| Resproin Limited | Real estate | 2024 |
| Rest Assured Constructon Ltd | Construction | 2026 |
| Rest Assured Enterprise Ltd | Administrative & support | 2026 |
| Restoration World Revival Church | Other services | 2011 |
| Retail Midlands Ltd | Wholesale & retail | 2014 |
| Retention Guru International Ltd | Education | 2026 |
| Retention Guru Limited | Education | 2012 |
| Rev-Ai Medical Consulting Limited | Health & social care | 2024 |
| Revely Ltd | Administrative & support | 2026 |
| Revision Master Ltd | Information & communication | 2026 |
| Revitalize Chinese Medicine and Acupuncture Limited | Health & social care | 2017 |
| Revuly Ltd | Information & communication | 2023 |
| Revvi Digital Solutions Private Limited | Wholesale & retail | 2024 |
| Revx Technologies Ltd | Information & communication | 2025 |
| Rewardsbag Ltd | Professional & scientific | 2018 |
| Rewire Rehab Ltd | Health & social care | 2020 |
| REX House Management Limited | Professional & scientific | 1999 |
| Rexipt Ltd | Information & communication | 2025 |
| Reya PUB Co Ltd | Hospitality | 2026 |
| Reynolds Court (Bristol) Management Limited | Households | 2014 |
| Reyvon Ltd | Wholesale & retail | 2023 |
| RFP Management Ltd | Real estate | 2024 |
| RG 28 Ltd | Hospitality | 2024 |
| RG London Ltd. | Households | 2018 |
| RGA 134 Dudden Hill Lane Limited | Real estate | 2024 |
| RGA Investments Ltd | Real estate | 2017 |
| RGA Property Services Limited | Construction | 2024 |
| Rgaa Holdings Ltd | Construction | 2022 |
| Rglen Trading Ltd | Wholesale & retail | 2024 |
| Rgnk Limited | Health & social care | 2022 |
| RGR Homes Limited | Real estate | 2023 |
| RGR Services Limited | Construction | 2026 |
| RGS Project Management Ltd | Construction | 2019 |
| RH Brickwork London Ltd | Construction | 2025 |
| RH Property Services Ltd | Professional & scientific | 2024 |
| Rh&A Limited | Hospitality | 2024 |
| RHB Consulting Limited | Information & communication | 2012 |
| Rhino Rage Ltd | Wholesale & retail | 2025 |
| Rhmsc Limited | Administrative & support | 2015 |
| Rhnr Management Company Limited | Households | 2009 |
| Riaz & Company Limited | Professional & scientific | 2013 |
| Ria’S Beauty Studio Ltd | Other services | 2022 |
| Rib's Tech Ltd | Wholesale & retail | 2025 |
| Rice and Morgan Logistics Ltd. | Transport & logistics | 2009 |
| Richard Bina Ltd | Information & communication | 2025 |
| Richard Russell (Panels) Limited | Wholesale & retail | 1952 |
| Richards Croydon Ltd | Wholesale & retail | 2021 |
| Richards Topup Ltd | Transport & logistics | 2024 |
| Richavard Limited | Wholesale & retail | 2020 |
| Richking Estates Ltd | Real estate | 2023 |
| Richlodge Assets Limited | Real estate | 2026 |
| Richmnd Ltd | Manufacturing | 2025 |
| Richmond Food Centre Ltd | Wholesale & retail | 2024 |
| Richmond Lakes (North Hykeham) Management Company Limited | Households | 2006 |
| Richmond Lodge Construction Limited | Construction | 2001 |
| Richmond Point Management Company Limited | Households | 2016 |
| Richmond Square (East Grinstead) Management Company Limited | Households | 1989 |
| Richmond Terrace Management Company Limited | Households | 1995 |
| Richo Accounting Services Ltd | Professional & scientific | 2020 |
| Richwell Construction Ltd | Construction | 2007 |
| Richwellness Limited | Wholesale & retail | 2026 |
| Rickmanleisureservices Limited | Wholesale & retail | 2025 |
| Ricky Basements Ltd | Construction | 2019 |
| Ricky Harrison Holdings Ltd | Financial services | 2018 |
| Ridepro Ltd | Professional & scientific | 2025 |
| Ridersnest Ltd | Other services | 2023 |
| Ridgeway Commercial Finance Limited | Financial services | 2025 |
| Ridgeway Finance Ltd | Financial services | 2020 |
| Ridgeway Properties (UK) Limited | Professional & scientific | 1999 |
| Ridgeway Scaffolding Solutions Limited | Construction | 2025 |
| Riga Limited | Professional & scientific | 2015 |
| Right Garden Services Ltd | Administrative & support | 2023 |
| Right Shout Ltd | Professional & scientific | 2017 |
| Right Temp Control Limited | Construction | 2017 |
| Right Time Apartments Limited | Real estate | 2024 |
| Right&Cosystay Ltd | Real estate | 2025 |
| Rigidas Software Ltd | Information & communication | 2016 |