| Quant & Cost Limited | Professional & scientific | 2026 |
| Quantum Venture Labs Ltd | Information & communication | 2025 |
| Quarry Plant & Industry North Limited | Extraterritorial | 2015 |
| Quartet of Buckingham Limited | Professional & scientific | 1990 |
| Qube Drink Solutions Ltd | Wholesale & retail | 2019 |
| Queer Noise CIC | Arts & recreation | 2024 |
| Quote Builder Pro Ltd | Wholesale & retail | 2025 |
| R & S Sharman Property Management Ltd | Real estate | 2020 |
| R & W Leisure Limited | Arts & recreation | 2025 |
| R D Allsop Plastering Services Limited | Construction | 2009 |
| R D Gomez Carpentry & Building Services Ltd | Manufacturing | 2023 |
| R D L H Property Ltd | Real estate | 2025 |
| R Langley Builders Limited | Construction | 2022 |
| R N R Recovery UK Limited | Health & social care | 2020 |
| R N Walpole - AWC Limited | Agriculture & fishing | 2012 |
| R S G Commercials Limited | Wholesale & retail | 2018 |
| R. N. Woodford Groundworks Limited | Construction | 2018 |
| R.C.M. Sweepers Ltd | Wholesale & retail | 2008 |
| Race Rita Ltd | Arts & recreation | 2024 |
| Rachel ANN Limited | Wholesale & retail | 2015 |
| Rachel Palmer Music Limited | Arts & recreation | 2023 |
| Rachel Smith GP Ltd | Health & social care | 2025 |
| Rade Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| Radiant Asset Management Limited | Financial services | 2021 |
| Radiant Central Services Limited | Financial services | 2015 |
| Radiant Financial Group Nomineeco Limited | Financial services | 2021 |
| Radiant Financial Group UK Holdings Limited | Financial services | 2018 |
| Radiant Financial Planning Limited | Financial services | 2000 |
| Radiant Platform Management Limited | Financial services | 2021 |
| Radiant Wealth Management Holdings Limited | Financial services | 2021 |
| Radon Protection UK Limited | Construction | 2016 |
| Railway Technology Consultants Limited | Professional & scientific | 1998 |
| Rainbow Psychotherapy Limited | Professional & scientific | 2025 |
| Raising the Standards - Painting & Decorating Ltd | Construction | 2022 |
| Raising the Standards Ltd | Construction | 2019 |
| Rambutan Limited | Professional & scientific | 2008 |
| Randalls Candy Limited | Wholesale & retail | 2020 |
| RAP Development Limited | Construction | 2017 |
| Rapid Safety Supplies Ltd | Wholesale & retail | 2023 |
| Rare Content Ltd | Administrative & support | 2015 |
| Ravencloud Limited | Agriculture & fishing | 2010 |
| Ravenhill House Ltd | Construction | 2021 |
| RAW Ambition Ltd | Professional & scientific | 2025 |
| RAW Properties 25 Ltd | Real estate | 2025 |
| RAY Communications Ltd | Wholesale & retail | 2019 |
| Raygun London Limited | Professional & scientific | 2017 |
| Raymeen Limited | Other services | 2024 |
| RB Surveying Limited | Professional & scientific | 2016 |
| RBO Consulting Limited | Information & communication | 2010 |
| RBR1 Ltd | Hospitality | 2023 |
| RC Power Distribution Services Limited | Construction | 2021 |
| RCH Business Solutions Limited | Professional & scientific | 2016 |
| REA Shop Ltd | Wholesale & retail | 2022 |
| Reaction Technologies Ltd | Professional & scientific | 2024 |
| Read AI UK Limited | Health & social care | 2024 |
| Reads Plumbing & Heating Ltd | Construction | 2014 |
| Readymoney Holdings Ltd | Financial services | 2025 |
| Readymoney Investments Limited | Financial services | 2009 |
| Real Marquees Ltd | Administrative & support | 2006 |
| Real Reindeer Limited | Arts & recreation | 2009 |
| Real Time Design and Technology Ltd | Professional & scientific | 2022 |
| Recordia IT Solutions Ltd | Information & communication | 2025 |
| Red Bike Tours Limited | Administrative & support | 2016 |
| Red Gator Ltd | Information & communication | 2015 |
| Red Kite Transport Consultancy Ltd | Transport & logistics | 2025 |
| Red Sky Technologies (UK) Limited | Administrative & support | 2003 |
| Red Squirrel Compliance Ltd | Professional & scientific | 2026 |
| Redhot Curry POT Ltd | Hospitality | 2023 |
| Reeo Property Limited | Construction | 2026 |
| Reeves Hardcastle Limited | Administrative & support | 1999 |
| Refinance 4U Limited | Extraterritorial | 2015 |
| Regina Property Management Limited | Real estate | 2015 |
| Rekrvt Ltd | Information & communication | 2016 |
| Renadell Limited | Real estate | 1979 |
| Renewable Contracting Solutions Ltd | Construction | 2025 |
| Renotech Limited | Households | 1992 |
| Rental & Property Maintenance Ltd | Other services | 2026 |
| Renuvaderm Ltd | Health & social care | 2019 |
| Reprolines Limited | Extraterritorial | 2012 |
| Restecp Ltd | Wholesale & retail | 2023 |
| Resurgo Advisory Group Ltd | Professional & scientific | 2026 |
| Retail Glue Ltd | Professional & scientific | 2015 |
| Reticulated ERP Ltd | Information & communication | 2012 |
| Retire With More Limited | Financial services | 2006 |
| Retreat Aluminium Doors & Windows Limited | Construction | 2019 |
| Retrofit Assessments Ltd | Professional & scientific | 2024 |
| Revet Limited | Professional & scientific | 2004 |
| Revival RUM Ltd | Manufacturing | 2021 |
| Rgprop Ltd | Real estate | 2016 |
| RH Medical Writing Ltd | Professional & scientific | 2016 |
| RHG Consult Ltd | Professional & scientific | 2003 |
| RHG Consult Trustee Limited | Extraterritorial | 2024 |
| Rhys James Ltd | Construction | 2018 |
| Ribarlo Limited | Financial services | 2026 |
| Richard Palmer Garden Design Ltd | Administrative & support | 2014 |
| Richard Parker Engineering | | 1997 |
| Richard Randall Woodburners Ltd | Administrative & support | 2015 |
| Richard Simmons Limited | Construction | 2002 |
| Richardson Estates Ltd | Real estate | 2023 |
| Richlytop Ltd | Manufacturing | 2022 |