| Quasar Europe Ltd. | Wholesale & retail | 2026 |
| Quatro Management Ltd | Wholesale & retail | 2015 |
| Quay Events Limited | Hospitality | 2021 |
| Qubec Ltd | Wholesale & retail | 2018 |
| Qubits Code Ltd | Information & communication | 2018 |
| Qubros Ltd | Wholesale & retail | 2013 |
| Qudos Solutions Limited | Professional & scientific | 1994 |
| QUE Investments Limited | Real estate | 2011 |
| Queall Ltd | Other services | 2022 |
| Queens Court (Buckhurst Hill) Management Company Limited | Households | 1989 |
| Queensberry Nursery Limited | Education | 2006 |
| Queensbury Investments Limited | Real estate | 2015 |
| Queensgate Longwood Gardens RTM Company Limited | Households | 2015 |
| Quest Research Technology Ltd | Information & communication | 2020 |
| Queste Ltd | Real estate | 2021 |
| Questo Limited | Real estate | 2020 |
| Questra Partners Ltd | Real estate | 2023 |
| Queu Queu Limited | Manufacturing | 2014 |
| Quick Accountancy Solutions Limited | Professional & scientific | 2023 |
| Quick Building Services Ltd | Construction | 2024 |
| Quick Buy Properties Ltd | Real estate | 2025 |
| Quick Check Limited | Wholesale & retail | 2009 |
| Quick Cleanerz Ltd | Administrative & support | 2023 |
| Quick Click Ltd | Wholesale & retail | 2019 |
| Quick Click Properties Ltd | Real estate | 2025 |
| Quick Glazing Ltd | Construction | 2020 |
| Quick Hare Couriers Ltd | Transport & logistics | 2026 |
| Quick Mobile FIX Limited | Administrative & support | 2014 |
| Quick Move Transport Ltd | Transport & logistics | 2024 |
| Quick N Simple Ltd | Information & communication | 2009 |
| Quick Pest Control Limited | Other services | 2009 |
| Quick Placement Ltd | Administrative & support | 2022 |
| Quick Property Sale-Uk Ltd | Real estate | 2018 |
| Quick Removals Limited | Transport & logistics | 2024 |
| Quick Response 247 Limited | Households | 2019 |
| Quick Response Ltd | Extraterritorial | 2024 |
| Quick Side Investment Ltd | Wholesale & retail | 2016 |
| Quick Sort Ltd | Other services | 2025 |
| Quick Tape Jointers Limited | Construction | 2018 |
| Quick Travel & Money Exchange Ltd | Transport & logistics | 2009 |
| Quick Van Services Ltd | Water & waste | 2026 |
| Quickbuy 1 Ltd | Wholesale & retail | 2026 |
| Quickdropoff Ltd | Financial services | 2026 |
| Quickfix Jobs Ltd | Construction | 2019 |
| Quickfix Plumbing & Maintenance Ltd | Construction | 2025 |
| Quicktradesgroup Limited | Administrative & support | 2025 |
| Quietly Iconic Ltd | Wholesale & retail | 2026 |
| Quindra Path Ltd | Wholesale & retail | 2025 |
| Quinque Limited | Hospitality | 2010 |
| Quintara Ltd | Construction | 2025 |
| Quinten Ltd | Construction | 2024 |
| Quinton House Care Limited | Health & social care | 2019 |
| Quinton House Limited | Health & social care | 1995 |
| Quinton Works Ltd | Construction | 2025 |
| Quirkymart Ltd | Wholesale & retail | 2024 |
| Quistive Solution Ltd | Wholesale & retail | 2023 |
| Quixlink Limited | Wholesale & retail | 2025 |
| Quizzicle Consulting Limited | Information & communication | 2018 |
| Quntic Ltd | Information & communication | 2025 |
| Quote 123 Ltd | Financial services | 2008 |
| Quote 123 Prop Co Ltd | Real estate | 2015 |
| Quqnus Ltd | Wholesale & retail | 2024 |
| Quran Inn World Ltd | Education | 2025 |
| Qureshi Inc Ltd | Health & social care | 2025 |
| Qutbi Ltd | Health & social care | 2022 |
| Qutbi Properties Ltd | Real estate | 2025 |
| QVT Ltd | Administrative & support | 2022 |
| Qwantify Finance Limited | Information & communication | 2025 |
| QWM Media Ltd | Professional & scientific | 2017 |
| QWY Ltd | Construction | 2025 |
| R & a Automotive Ltd | Wholesale & retail | 2023 |
| R & B Care Limited | Real estate | 2009 |
| R & B Halal London Ltd | Wholesale & retail | 2024 |
| R & B Halal Ltd | Wholesale & retail | 2017 |
| R & B Quality Import and Export Limited | Professional & scientific | 2005 |
| R & Carrubba Limited | Administrative & support | 2024 |
| R & D Architects Limited | Professional & scientific | 1981 |
| R & F (Investments) Limited | Extraterritorial | 2013 |
| R & F Ukbd Ltd | Other services | 2021 |
| R & K Private Ltd | Real estate | 2019 |
| R & M Global Consulting Ltd | Professional & scientific | 2022 |
| R & M Sons Ltd | Wholesale & retail | 2023 |
| R & P Cleaning Services Limited | Other services | 1998 |
| R & R Hair and Beauty Ltd | Other services | 2026 |
| R & R Media House Ltd | Information & communication | 2025 |
| R & S Kiosk Ltd | Wholesale & retail | 2021 |
| R & V Investments (UK) Ltd | Real estate | 2010 |
| R & Z London Ltd | Extraterritorial | 2016 |
| R a Corporation Ltd | Transport & logistics | 2017 |
| R a Engineers UK Ltd | Wholesale & retail | 2024 |
| R a Legal Consultancy Limited | Professional & scientific | 2025 |
| R Bedi and Co Podiatry Limited | Health & social care | 2018 |
| R Brar LLP | | 2018 |
| R Car Spa Ltd | Administrative & support | 2025 |
| R Cheema Investments Ltd | Real estate | 2023 |
| R Chef Express Ltd | Hospitality | 2023 |
| R D Fitters Ltd | Manufacturing | 2024 |
| R Foods Store Ltd | Professional & scientific | 2025 |
| R G a Marsh Electrical Ltd | Construction | 2014 |
| R G Worldwide UK Ltd | Health & social care | 2025 |