| Quinn BC Ltd | Administrative & support | 2023 |
| Quintessence Capital Ltd | Financial services | 2024 |
| Quintessence Group Ltd | Financial services | 2024 |
| Quokkadoo Ltd | Construction | 2017 |
| Qute Prop 02 Ltd | Real estate | 2024 |
| Qute Prop 03 Ltd | Real estate | 2025 |
| Qute Prop 04 Ltd | Real estate | 2026 |
| Qute Prop Ltd | Real estate | 2022 |
| Qwintels Quantum Wisdom Intelligence Systems Ltd | Information & communication | 2025 |
| R & C Cleaning Services Limited | Administrative & support | 2003 |
| R & J P International Limited | Manufacturing | 1978 |
| R & R Property Investments LLP | | 2010 |
| R a Segal LLP | | 2011 |
| R BOW Ltd | Real estate | 2025 |
| R J Busfield (Services) Limited | Construction | 2003 |
| R K Construction (London) Ltd | Construction | 1994 |
| R K Developments (Theydon Bois) Ltd | Construction | 2001 |
| R K Joinery Ltd. | Construction | 1985 |
| R K New Developments Ltd | Construction | 1993 |
| R K Property Investments Ltd. | Construction | 1979 |
| R K Signature Interiors Ltd | Construction | 2020 |
| R M 8 Developments Ltd | Real estate | 2012 |
| R M Delight Ltd | Hospitality | 2019 |
| R Mckay & Sons Ltd | Construction | 2021 |
| R N R International Ltd | Wholesale & retail | 2015 |
| R Nation Limited | Arts & recreation | 2019 |
| R S Guttering Services Ltd | Construction | 2022 |
| R S Properties London Limited | Real estate | 2012 |
| R Spiers Property Services Ltd | Real estate | 2024 |
| R Spiers Roofing Limited | Construction | 2018 |
| R&P Air Conditioning Ltd | Construction | 2016 |
| R&R Stone Services Limited | Manufacturing | 2026 |
| R. J. H. Developments Limited | Professional & scientific | 1976 |
| R.E. Charlwood (Properties) Limited | Financial services | 1972 |
| R.E.C. Steel Services Limited | Construction | 2011 |
| R1 Cooling Ltd | Manufacturing | 2023 |
| R3 Construction Ltd | Construction | 2023 |
| R3G Gaming Ltd | Professional & scientific | 2025 |
| RA Medical Limited | Health & social care | 2016 |
| RA Romford Ltd | Real estate | 2025 |
| Race Streams Ltd | Arts & recreation | 2021 |
| Race Supplies Limited | Other services | 2023 |
| Raceguide Limited | Administrative & support | 2006 |
| Racetek Limited | Information & communication | 2015 |
| Radi Cleaning 19 Ltd | Administrative & support | 2019 |
| Radi Cleaning Ltd | Construction | 2016 |
| Radical IT Limited | Information & communication | 2005 |
| Radio Developments Ltd | Real estate | 2013 |
| Radio Investments Holdings Limited | Financial services | 2021 |
| Radlett Care Limited | Health & social care | 2000 |
| Radlett Close Freehold Owners Ltd | Households | 2011 |
| Raftery Consulting Limited | Administrative & support | 2022 |
| Ragoneig Ltd | Professional & scientific | 2015 |
| Railvolution Ltd | Manufacturing | 2025 |
| Rain London Ltd | Information & communication | 2020 |
| Raine Gardens Woodford Management Limited | Real estate | 2005 |
| Raising a Wild Child and PDA Foundation CIC | Health & social care | 2024 |
| Rajiv Grover Ltd | Extraterritorial | 2015 |
| Ramcargo Ltd | Transport & logistics | 2023 |
| RAN Autos Ltd | Construction | 2021 |
| Ranby Lift Services Ltd | Manufacturing | 2020 |
| RAP Projects Ltd | Manufacturing | 2021 |
| Raphael Investments Limited | Construction | 2008 |
| Raphilo Property Management Ltd | Real estate | 2019 |
| Rapid Tracks Ltd | Construction | 2024 |
| Rasco Enterprise Limited | Information & communication | 2007 |
| Rashid Courier Service Limited | Transport & logistics | 2016 |
| Raven's Auto's Limited | Wholesale & retail | 2017 |
| Ravenholt Properties Ltd | Real estate | 2019 |
| Ravora FX Limited | Financial services | 2026 |
| Rawbridge Limited | Administrative & support | 2009 |
| Rawc Ltd | Health & social care | 2020 |
| Rawmec Limited | Wholesale & retail | 2014 |
| Raya Estates Limited | Real estate | 2021 |
| Rayburne Court Limited | Households | 1989 |
| Rayna Finance Ltd | Financial services | 2018 |
| Rayna Residential Ltd | Real estate | 2017 |
| Raza Motors Ltd | Wholesale & retail | 2017 |
| RB Medical Communications Limited | Professional & scientific | 2021 |
| RBB Construction Ltd | Construction | 2010 |
| Rbca Building Control Ltd | Professional & scientific | 2024 |
| RBL Investment Management Limited | Real estate | 2015 |
| RC Bancroft Ltd | Real estate | 2026 |
| RC Lofts Ltd | Real estate | 2026 |
| RCE Clarity Ltd | Other services | 2020 |
| RD Associates Limited | Administrative & support | 2024 |
| RD Building Contractors Ltd | Construction | 2022 |
| RD Fire Health & Safety Consultancy Ltd | Professional & scientific | 2026 |
| RD Property Investments Ltd | Financial services | 2022 |
| RDF Solutions Limited | Information & communication | 2013 |
| RDM Kitchens Ltd | Construction | 2015 |
| Re:Dream Ltd | Wholesale & retail | 2016 |
| Readimix Trucks Ltd | Wholesale & retail | 2016 |
| Real Estate Investment and Trading Limited | Real estate | 1991 |
| Real First AID Limited | Education | 2010 |
| Real Infinity Limited | Other services | 2019 |
| Real Key Estates Limited | Real estate | 2026 |
| Real MA Limited | Other services | 2017 |
| Real Martial Arts Limited | Arts & recreation | 2019 |
| Realign Wellness Ltd | Administrative & support | 2024 |