| Quality Produce Ltd | Wholesale & retail | 2019 |
| Quality Quality Limited | Administrative & support | 2013 |
| Quality Security Services Limited | Construction | 2010 |
| Quality Site Cleaning Services Ltd | Administrative & support | 2020 |
| Quality Start Limited | Administrative & support | 2010 |
| Quality Start Properties Limited | Households | 2021 |
| Quality Touch Ltd | Wholesale & retail | 2019 |
| Quality Training Partnership Limited | Education | 2014 |
| Quality Training Services (UK) Limited | Extraterritorial | 2001 |
| Quality Work and Staff Solution Limited | Administrative & support | 2017 |
| Quality Workforce Ltd | Information & communication | 2018 |
| Qualityhomestore Ltd | Wholesale & retail | 2026 |
| Qualityone Consultancy Limited | Information & communication | 2022 |
| Quan WEI Zhai Ltd | Manufacturing | 2018 |
| Quantalyst Ltd | Information & communication | 2013 |
| Quantest Ltd | Professional & scientific | 2024 |
| Quantify Solutions Ltd | Information & communication | 2024 |
| Quantify Surveying Solutions Limited | Construction | 2008 |
| Quantik Engage Ltd | Professional & scientific | 2023 |
| Quantik Expert Witness Limited | Professional & scientific | 2022 |
| Quantik Services Ltd | Professional & scientific | 2022 |
| Quantimind Limited | Information & communication | 2014 |
| Quantiv & Build Co Ltd | Professional & scientific | 2025 |
| Quantive Digital Ltd | Information & communication | 2025 |
| Quantlet Ltd | Real estate | 2018 |
| Quantlettings Limited | Households | 2025 |
| Quanto Holdings Limited | Financial services | 2021 |
| Quantom Professional Ltd. | Other services | 2016 |
| Quantum Assets Holdings Ltd | Real estate | 2025 |
| Quantum CCS Limited | Administrative & support | 2022 |
| Quantum Consult Holdings Limited | Financial services | 2020 |
| Quantum Consult Limited | Professional & scientific | 2001 |
| Quantum Development Properties Limited | Real estate | 2018 |
| Quantum Expert Solutions Limited | Professional & scientific | 2015 |
| Quantum Health Technologies Ltd | Information & communication | 2025 |
| Quantum Improvement Coaching & Consulting Ltd | Professional & scientific | 2023 |
| Quantum ML Limited | Administrative & support | 2024 |
| Quantum Research & Valuation Limited | Professional & scientific | 2015 |
| Quantuma Advisory (Yorkshire) Limited | Professional & scientific | 1998 |
| Quantumpivot Limited | Information & communication | 2023 |
| Quantus Foods Ltd. | Manufacturing | 2018 |
| Quantus PSM Limited | Administrative & support | 2016 |
| Quarmby Colour Studio Limited | Professional & scientific | 2003 |
| Quarmby Construction (Special Projects) Limited | Construction | 1989 |
| Quarry Arena Ltd | Hospitality | 2023 |
| Quarry Consulting Services Limited | Manufacturing | 2019 |
| Quarry Edge Ltd | Construction | 2025 |
| Quarry Enterprises Limited | Administrative & support | 2025 |
| Quarry Management Company Limited | Real estate | 2017 |
| Quarter 4 Ltd | Financial services | 2023 |
| Quarterz Ltd | Hospitality | 2014 |
| Quartium Estates LLP | | 2005 |
| Quartz Business Solutions Limited | Professional & scientific | 2025 |
| Quaternion Capital Limited | Financial services | 2022 |
| Quaternion Properties Limited | Real estate | 2017 |
| Quatrain Architectural Glazing Systems Ltd | Manufacturing | 2021 |
| Quattro Huddersfield RTM Company Ltd | Real estate | 2009 |
| Quattro Mechanical and Electrical Services Limited | Construction | 2025 |
| Quay Debt Solutions Ltd | Financial services | 2018 |
| Quay Finance Ltd | Professional & scientific | 2024 |
| Quay Propco Limited | Real estate | 2014 |
| Quay West Grimsby LLP | | 2017 |
| Quaystone Business Solutions Limited | Information & communication | 2005 |
| Qube Real Estates Ltd | Real estate | 2020 |
| Qube Renovations Ltd | Construction | 2026 |
| Quckate Ltd | Wholesale & retail | 2025 |
| QUE Medics Ltd | Health & social care | 2026 |
| Quebec Law Solicitors Ltd | Professional & scientific | 2018 |
| Quebec Properties Ltd | Real estate | 2016 |
| Queen Margaret's School, York Limited | Education | 1986 |
| Queen Street (City) Business Centre Limited | Real estate | 2013 |
| Queen Street Business Centre Limited | Real estate | 2010 |
| Queens Court Culvert Management Company Limited | Real estate | 2006 |
| Queens Court Management Company (Ilkley) Limited | Households | 2001 |
| Queens Drive (Management Company) Pudsey Limited | Households | 1996 |
| Queens Hall Management Company Limited | Real estate | 2006 |
| Queens of Clean Ltd | Administrative & support | 2025 |
| Queens Road MOT Centre Limited | Wholesale & retail | 2010 |
| Queensbury Gardens Management Company Limited | Households | 2014 |
| Queensland Care Limited | Health & social care | 2005 |
| Queensroad Accident Repair Centre Ltd | Wholesale & retail | 2021 |
| Queer Blend Ltd | Wholesale & retail | 2025 |
| Quest 992 Ltd | Manufacturing | 2022 |
| Quest Consulting Services Ltd | Professional & scientific | 2009 |
| Quest Consumables Limited | Wholesale & retail | 1973 |
| Quest for Education | Education | 2011 |
| Quest Public Relations Limited | Professional & scientific | 2002 |
| Quester Home Support Ltd | Health & social care | 2014 |
| Questioned Documents Service Ltd | Professional & scientific | 2012 |
| Quibell and SON (Holdings) Limited | Professional & scientific | 1903 |
| Quick Alert Services Ltd | Administrative & support | 2021 |
| Quick Crave Corner Limited | Hospitality | 2025 |
| Quick FIX (UK) Ltd | Construction | 2012 |
| Quick FIX MOT Centre Ltd | Wholesale & retail | 2024 |
| Quick Frame Sales Limited | Manufacturing | 2001 |
| Quick Labs Ltd | Professional & scientific | 2024 |
| Quick Loans Ltd | Financial services | 2015 |
| Quick Mortgages UK Ltd | Financial services | 2024 |
| Quick Response Consulting Limited | Professional & scientific | 2017 |
| Quick Response Estate Ltd | Real estate | 2024 |