| Quality Food Corporation Ltd | Wholesale & retail | 2020 |
| Quality I Consultancy Ltd | Education | 2016 |
| Quality Licence Scheme Limited | Education | 2016 |
| Quality Living Ltd | Households | 2018 |
| Quality Living Property Services Limited | Professional & scientific | 2023 |
| Quality Property & Electrical Services Ltd | Energy | 2007 |
| Quality Research Training and Reports Ltd | Health & social care | 2017 |
| Quality Service Recruitment Limited | Administrative & support | 1993 |
| Quality Wash Ltd | Administrative & support | 2025 |
| Qualitymark Developments Ltd | Real estate | 2025 |
| Qualsys Limited | Professional & scientific | 1995 |
| Qualtech Engineering Services Limited | Construction | 2000 |
| QUANT8 Ltd | Information & communication | 2024 |
| Quantex Tech Solutions UK Ltd | Wholesale & retail | 2025 |
| Quantic Wellness Ltd | Extraterritorial | 2023 |
| Quantified Athlete Limited | Manufacturing | 2018 |
| Quantifun Ltd | Information & communication | 2026 |
| Quantum Clothing Group Limited | Manufacturing | 1865 |
| Quantum Debtco Limited | Financial services | 2020 |
| Quantum Express Ltd | Transport & logistics | 2022 |
| Quantum House Management Limited | Real estate | 2011 |
| Quantum Intelligent Trading Ltd | Professional & scientific | 2008 |
| Quantum Materials and Software Ltd | Information & communication | 2023 |
| Quantum Medical Ltd | Health & social care | 2011 |
| Quantum Midco Limited | Financial services | 2020 |
| Quantum Parent Limited | Financial services | 2020 |
| Quantum Property (UK) Limited | Construction | 2008 |
| Quantum Textile Solutions Ltd | Other services | 2017 |
| Quantum Topco Limited | Financial services | 2020 |
| Quantum View Technologies Ltd | Extraterritorial | 2024 |
| QUANTUMENCRYPTION1 Ltd | Professional & scientific | 2026 |
| Quantumscales Systems Limited Ltd | Professional & scientific | 2025 |
| Quartet Marketing Ltd | Professional & scientific | 2025 |
| QUARTET4 Ltd | Information & communication | 2013 |
| Quartum Solutions Engineering Ltd | Information & communication | 2025 |
| Quartz Barristers Limited | Professional & scientific | 2018 |
| Quattro Optical Ltd | Wholesale & retail | 2024 |
| Quattro Sasp Limited | Professional & scientific | 2008 |
| Quayside Quality Ltd | Wholesale & retail | 2025 |
| Qubacci Limited | Administrative & support | 2024 |
| Qube Architects Limited | Construction | 2008 |
| Qube Holdings Limited | Professional & scientific | 2001 |
| Qube IT Consulting Ltd | Information & communication | 2018 |
| Qube Qualifications and Development Limited | Education | 1994 |
| Qube Total Solutions Ltd | Manufacturing | 2003 |
| Qubic GAS & Heating Ltd | Construction | 2025 |
| Quench Coffee Limited | Hospitality | 2009 |
| Quensus Limited | Manufacturing | 2015 |
| Querneby Properties Ltd | Administrative & support | 2017 |
| Quest Baits Limited | Wholesale & retail | 2000 |
| Quest NO More Ltd | Information & communication | 2019 |
| Quick Bargains Store Ltd | Wholesale & retail | 2024 |
| Quick Declare Ltd | Transport & logistics | 2026 |
| Quick Energy Systems Limited | Extraterritorial | 2015 |
| Quick Self Storage (Ambergate) Limited | Administrative & support | 2023 |
| Quick Self Storage (Darlington) Limited | Administrative & support | 2021 |
| Quick Self Storage (Liverpool) Limited | Financial services | 2023 |
| Quick Self Storage (Long Eaton) Limited | Financial services | 2023 |
| Quick Self Storage (Middlesbrough) Limited | Real estate | 2025 |
| Quick Self Storage (Nottingham) Limited | Administrative & support | 2023 |
| Quick Self Storage (Peterborough) Limited | Administrative & support | 2025 |
| Quick Self Storage (Scunthorpe) Limited | Administrative & support | 2026 |
| Quick Self Storage (Sleaford) Limited | Administrative & support | 2025 |
| Quick Self Storage (Sunderland) Limited | Administrative & support | 2025 |
| Quick Self Storage (Walsall) Limited | Real estate | 2025 |
| Quick Self Storage (Wigan) Limited | Financial services | 2023 |
| Quick Self Storage Holdings Limited | Financial services | 2021 |
| Quick Stitch Embroidery and Print Ltd | Other services | 2019 |
| Quick Stop (NG) Ltd | Wholesale & retail | 2025 |
| Quickdel Ltd | Transport & logistics | 2023 |
| Quickfix Maintenance Limited | Other services | 2025 |
| Quickits Group Limited | Professional & scientific | 2017 |
| Quickits Holdings Limited | Manufacturing | 2014 |
| Quickits Limited | Manufacturing | 2004 |
| Quickmeals Ltd | Manufacturing | 2010 |
| Quickqlick Ltd | Manufacturing | 2025 |
| Quicks (1997) Motor Holdings Limited | Professional & scientific | 1989 |
| Quicks Finance Limited | Financial services | 1989 |
| Quicksameday Courier Ltd | Wholesale & retail | 2025 |
| Quicksense Solutions Limited | Information & communication | 2016 |
| Quickserv Mobile Ltd | Wholesale & retail | 2025 |
| Quickshift Driving School Ltd | Education | 2023 |
| Quicksilver Computers Limited | Administrative & support | 1994 |
| Quicktex Ltd | Manufacturing | 2024 |
| Quickzone Construction Ltd | Manufacturing | 2022 |
| Quiet Hearth Therapy Ltd | Wholesale & retail | 2026 |
| Quiet Tiger Aviation Limited | Education | 2021 |
| Quill Partners Ltd | Administrative & support | 2026 |
| Quincey Mason Practices Limited | Professional & scientific | 1992 |
| Quindecim Limited | Real estate | 2020 |
| Quinn Developments (East Midlands) Limited | Information & communication | 2025 |
| Quinn Holdings and Investments Limited | Real estate | 2025 |
| Quinns of Greasby Limited | Extraterritorial | 2000 |
| Quintessential Property & Management Limited | Real estate | 2024 |
| Quirkified Limited | Wholesale & retail | 2025 |
| Quirkiture Limited | Other services | 2014 |
| Quirky Bird Strengths Ltd | Professional & scientific | 2024 |
| Quirky Duck Antique and Interiors Centre Limited | Construction | 2023 |
| Quirky Duck Interiors Ltd | Wholesale & retail | 2021 |
| Quirky Marketing Limited | Professional & scientific | 2021 |