| Quantsmart Technologies Ltd | Information & communication | 2022 |
| Quantum Resolve Limited | Extraterritorial | 2021 |
| Quantum Spark Ltd | Professional & scientific | 2025 |
| Quantus Wealth Management Ltd | Professional & scientific | 2026 |
| Quartz Engineering Ltd | Professional & scientific | 2016 |
| Quayline Reprographics Limited | Manufacturing | 1991 |
| Quba CIS Limited | Financial services | 2020 |
| Quba Solutions Limited | Financial services | 2012 |
| Quick JSR Solutions Limited | Administrative & support | 2012 |
| Quickdraw Supplies Limited | Wholesale & retail | 2004 |
| Quindell Business Process Services Limited | Professional & scientific | 1980 |
| Quoinstone Property Limited | Professional & scientific | 2009 |
| Qwerty Type Limited | Education | 2019 |
| QX Solutions Limited | Administrative & support | 2012 |
| R & a Healthcare Operations LLP | | 2017 |
| R & a Renewables Limited | Construction | 2014 |
| R & B Sports and Music Hospitality Limited | Administrative & support | 2024 |
| R & D Surfacing Contractors Limited | Construction | 2003 |
| R & L Building & Carpentry Limited | Construction | 2024 |
| R a Barnes Electrical Limited | Construction | 2020 |
| R B Associates (South) Ltd | Administrative & support | 2012 |
| R B F Supplies Limited | Administrative & support | 1997 |
| R F G Driving School Limited | Education | 2017 |
| R Hudson Plumbing & Heating Limited | Construction | 2022 |
| R J Carter Consulting Limited | Professional & scientific | 2006 |
| R J G Plumbing Limited | Construction | 2010 |
| R J GSE Engineering Limited | Manufacturing | 2008 |
| R K Chhina Properties Ltd | Real estate | 2023 |
| R Kinge Property Maintenance Limited | Construction | 2003 |
| R L Bennett Limited | Construction | 2007 |
| R North Ltd | Professional & scientific | 2019 |
| R Young Plumbing & Heating Limited | Construction | 2006 |
| R&C Home Improvements Ltd | Construction | 2025 |
| R&J Hospitality Limited | Hospitality | 2024 |
| R&R Construction Services Limited | Construction | 2023 |
| R-Tech Developments Ltd | Wholesale & retail | 2013 |
| R. & J. Tooling Products Limited | Professional & scientific | 1999 |
| R. & M. Catering Limited | Hospitality | 1973 |
| R. Ingram Coins Ltd | Wholesale & retail | 2020 |
| R. N. Williams Properties Limited | Hospitality | 2020 |
| R.B.Phillips Building and Developments Limited | Real estate | 1965 |
| R.G. Legg Construction Limited | Financial services | 1972 |
| R.H.Long Limited | Professional & scientific | 2013 |
| R.I. Manufacturing Ltd. | Professional & scientific | 1993 |
| R.S. Birch and Partners Limited | Construction | 1997 |
| Rabbit Care UK Limited | Other services | 2022 |
| Racetruck Ltd | Extraterritorial | 2017 |
| Rachel Slough Consulting Limited | Education | 2005 |
| Racing Perfection Ltd | Arts & recreation | 2008 |
| Radford Building Contractors Ltd | Construction | 2025 |
| Radian Capital PLC | Financial services | 2011 |
| Radian Developments Limited | Construction | 2018 |
| Radiant Seeds Ltd | Information & communication | 2020 |
| Radiology Matters Ltd | Extraterritorial | 2017 |
| Radsonic Courier Ltd | Transport & logistics | 2026 |
| RAE Holdings Ltd | Real estate | 2017 |
| RAF SAT Limited | Manufacturing | 2016 |
| RAG Fabricators Ltd | Manufacturing | 2014 |
| Ragnar Prime Ltd | Construction | 2024 |
| RAI Field & Sons Ltd | Real estate | 2024 |
| RAI Field Ltd | Real estate | 2025 |
| Railway Civil Engineering Ltd | Construction | 2012 |
| Rainbow Cyber Security Limited | Information & communication | 2017 |
| Rainbow Place Management Limited | Households | 1986 |
| Rainbows Village Pre-School Limited | Education | 2011 |
| Rainproof Roofing Ltd | Construction | 2021 |
| Rald Associates Ltd | Real estate | 2025 |
| Ramahanu Limited | Real estate | 2024 |
| Rambles (Hants) Limited | Administrative & support | 2019 |
| Rambling Rovers Limited | Other services | 2023 |
| Rapid Wellbeing Therapies Limited | Health & social care | 2024 |
| Raptor Steel Services Limited | Construction | 2017 |
| Rasbach Consult Limited | Administrative & support | 2012 |
| Rasha Barber Ltd | Other services | 2024 |
| Rasmayi Limited | Health & social care | 2016 |
| Rathaus Ltd | Professional & scientific | 2026 |
| Rattue Co. Limited | Administrative & support | 1985 |
| Ravensdale Consulting Limited | Administrative & support | 2025 |
| RAY Bell Engineering Services Ltd | Manufacturing | 2019 |
| RAY Godfrey Ltd | Manufacturing | 2014 |
| Rayann Limited | Health & social care | 2014 |
| Raykar Ltd | Information & communication | 2017 |
| Rayker Consulting Limited | Information & communication | 2015 |
| Raymond Brown A303 Holdco Limited | Financial services | 2024 |
| Raymond Brown A303 Properties Limited | Real estate | 2018 |
| Raymond Brown Minerals & Recycling Ltd | Administrative & support | 1998 |
| Raymond Brown New Topco Limited | Financial services | 2024 |
| Raymond Brown Quarry Holdco Limited | Financial services | 2024 |
| Raymond Brown Quarry Products Limited | Mining & quarrying | 2017 |
| Raymond Brown Rookery Holdco Limited | Financial services | 2024 |
| Raymond Brown Rookery Properties Limited | Real estate | 2018 |
| Raymond Estates Ltd | Real estate | 2010 |
| Razaaq Ltd | Construction | 2021 |
| RB Landscaping & Groundworks Ltd | Administrative & support | 2021 |
| Rbmr Topco Limited | Financial services | 2016 |
| RD Automation Ltd | Manufacturing | 2021 |
| RDA Building Solutions Limited | Professional & scientific | 2019 |
| RE Roofing Contractors Ltd | Construction | 2025 |
| React & Refurb Group Ltd | Administrative & support | 2012 |
| Reactivate Communications Ltd | Arts & recreation | 2002 |