| Quaye Biomedical Ltd | Professional & scientific | 2023 |
| Quaye Property Services Ltd | Real estate | 2023 |
| Queeley Electrical Solutions Ltd | Construction | 2025 |
| Queen Anne Avenue Maintenance Ltd | Professional & scientific | 2012 |
| Queenswood Court Freehold Company Limited | Households | 1991 |
| Quest for Exams Educations UK Ltd | Education | 2024 |
| Quest Kingdom Ltd | Wholesale & retail | 2024 |
| Quest Soul Theatre C.I.C. | Arts & recreation | 2023 |
| Quick Recruit Ltd | Administrative & support | 2022 |
| Quigley & Daughters Limited | Real estate | 2019 |
| Quill Literary Ltd | Information & communication | 2021 |
| Quinn Premier Properties Ltd | Hospitality | 2024 |
| Quinnteck Ltd | Information & communication | 2024 |
| Quintilian Education Limited | Education | 2019 |
| Qylou Studios Ltd | Manufacturing | 2026 |
| R & F Property Ltd | Real estate | 2021 |
| R & M Lines Limited | Construction | 2005 |
| R & P Flooring Bucks Ltd | Construction | 2020 |
| R and a Bosher. Education Advisers. Ltd | Education | 2016 |
| R and J Medical Services Limited | Administrative & support | 2019 |
| R G & R G Patel Ltd | Wholesale & retail | 2014 |
| R Innovate Consultancy Ltd | Professional & scientific | 2024 |
| R J Wall, Consultancy and Interim Management Limited | Professional & scientific | 2018 |
| R J Webster & Sons Ltd | Construction | 2014 |
| R N Construction Ltd | Construction | 2013 |
| R&H Security Ltd | Administrative & support | 2021 |
| R&N Autoland Ltd | Wholesale & retail | 2022 |
| R&R Football Club Ltd | Arts & recreation | 2018 |
| R-Qs Cafe Ltd | Hospitality | 2025 |
| R. Andrews & SON Limited | Real estate | 1983 |
| R. French & SON (Flowers) Ltd | Wholesale & retail | 2013 |
| R. W. Corbett Investments Ltd | Real estate | 2007 |
| R.D. Mcdowall Limited | Professional & scientific | 1998 |
| R.J.O Holdings Limited | Financial services | 2018 |
| R.Kimpton Building Services Limited | Construction | 2002 |
| R.Rivera Ltd | Administrative & support | 2022 |
| R.T. Financial Services Limited | Financial services | 2001 |
| R.T. Financial Services UK Limited | Financial services | 2006 |
| R1 Consulting Limited | Professional & scientific | 2025 |
| Rachael Lander Limited | Administrative & support | 2023 |
| Racro Limited | Wholesale & retail | 2015 |
| Radicalz Limited | Professional & scientific | 2024 |
| Radiology and Leadership Services Ltd | Health & social care | 2022 |
| Radix Holdings Limited | Financial services | 2018 |
| Radley House (Slough) RTM Company Limited | Real estate | 2025 |
| Radwanium Ltd | Information & communication | 2020 |
| Raffa 18 Ltd | Construction | 2020 |
| Ragarfield Property Investments Limited | Real estate | 2024 |
| RAH Property Rentals Limited | Real estate | 2021 |
| Rain and BOW Ltd | Real estate | 2022 |
| Rainbow 777 Limited | Construction | 2009 |
| Rainbow Paediatric Neuropsychology Limited | Health & social care | 2021 |
| Raine Accountants Limited | Professional & scientific | 2020 |
| Rains of Wisdom Ltd | Health & social care | 2023 |
| Raise the Children International | Health & social care | 2012 |
| Raita Services Ltd | Construction | 2020 |
| Rakats Care Services Ltd | Health & social care | 2025 |
| Raleigh House Management Limited | Households | 1970 |
| Ralf and RAY Petcare Limited | Other services | 2017 |
| Ralll Homes Ltd | Real estate | 2023 |
| Ralph's Healthcare Ltd | Health & social care | 2021 |
| Ramanova Solutions Ltd | Information & communication | 2026 |
| Ramhead Ltd | Information & communication | 2022 |
| Ramona Consulting Limited | Administrative & support | 2017 |
| Rampart Street Limited | Households | 2020 |
| Ramped Media Ltd | Information & communication | 2021 |
| Ramzi Yakob Ltd | Professional & scientific | 2020 |
| RAN Associates Limited | Professional & scientific | 2023 |
| Randall Court Management Company Limited | Real estate | 2016 |
| Range Lifts Limited | Manufacturing | 2025 |
| Range of Time Ltd | Wholesale & retail | 2019 |
| Ranger Mansions Management Company Limited | Real estate | 2013 |
| Rangesounds Ltd | Administrative & support | 2025 |
| Rania Cars Limited | Administrative & support | 2026 |
| Rania Trading Limited | Other services | 2019 |
| Ranipathy Ltd | Hospitality | 2021 |
| RAP Association C.I.C. | Information & communication | 2018 |
| Rapidvs Assets Limited | Arts & recreation | 2026 |
| Raptor Investments Limited | Administrative & support | 2011 |
| Rare Earth Travel Ltd | Administrative & support | 2022 |
| RAS Holdco Ltd | Administrative & support | 2024 |
| RAS Store Support Ltd | Administrative & support | 2022 |
| RAS Supply Chain Integrity Ltd | Administrative & support | 2018 |
| Rasg Holdco Ltd | Administrative & support | 2024 |
| Rasmussens Boligudlejning Limited | Agriculture & fishing | 2008 |
| Rateworthy Residents Management Limited | Real estate | 1988 |
| Raveena Software Solutions Limited | Information & communication | 2007 |
| Ravens Gate Mews Limited | Households | 2014 |
| Ravensbolt Limited | Wholesale & retail | 2011 |
| Ravensbourne Clinic Limited | Health & social care | 2024 |
| Ravenscar 1959 Limited | Extraterritorial | 2013 |
| Ravensroost Management Limited | Households | 1981 |
| Ravenstone Estates Bromley Limited | Real estate | 2025 |
| RAW Mortgages Limited | Financial services | 2013 |
| Rawjaw Properties Ltd | Real estate | 2020 |
| Rawlings Editing Limited | Information & communication | 2001 |
| Rawlins Court (Albermarle Road) Management Limited | Households | 1971 |
| RAY Jones Roofing Limited | Construction | 2018 |
| RAY RAY - WE GOT Sole Limited | Manufacturing | 2016 |
| RAY Shahid Wealth Management Ltd | Financial services | 2019 |