| Qroutes Limited | Information & communication | 2016 |
| QRT Foundation | Other services | 2026 |
| Qrun Ltd | Transport & logistics | 2024 |
| QS Consultancy & Claims Ltd | Administrative & support | 2017 |
| QS Designs Limited | Manufacturing | 2017 |
| QS Project Services Limited | Professional & scientific | 2009 |
| QSC Services Ltd | Financial services | 2020 |
| Qsensor Ltd | Information & communication | 2022 |
| QSS Acoustics Ltd | Administrative & support | 2026 |
| QT Education Ltd | Administrative & support | 2011 |
| Qtac Solutions Limited | Information & communication | 1994 |
| Quad Consultants Ltd | Professional & scientific | 2023 |
| Quad Properties (Bristol) Limited | Real estate | 2017 |
| Quade Clothing Ltd | Wholesale & retail | 2024 |
| Quadel Health Care Services Limited | Health & social care | 2023 |
| Quadraluv Ltd | Information & communication | 2021 |
| Quadrant 2 Holdings Limited | Financial services | 2017 |
| Quadrant Bars Limited | Hospitality | 2014 |
| Quadrant DUB Ltd | Information & communication | 2018 |
| Quadraspire Limited | Manufacturing | 1995 |
| Quadrilles Maintenance Company Limited(The) | Households | 1976 |
| Quadstone Holdings Ltd. | Financial services | 2026 |
| Quaegis Limited | Information & communication | 2026 |
| Quainte Ltd | Information & communication | 2013 |
| Quake Construction Ltd | Extraterritorial | 2020 |
| Quaker Action on Alcohol and Drugs | Health & social care | 1996 |
| Quaker Lane Management Company Ltd | Households | 2023 |
| Quakers Walk (Devizes) Management Company Limited | Households | 2020 |
| Qualcomm Services Ltd | Information & communication | 2023 |
| Qualimatrix Ltd | Information & communication | 2023 |
| Qualipath Consultancy Ltd | Professional & scientific | 2026 |
| Qualitas Global Limited | Wholesale & retail | 2023 |
| Qualitronics UK Ltd | Administrative & support | 2009 |
| Quality & Compassionate Care Ltd | Hospitality | 2021 |
| Quality AL Ltd | Construction | 2024 |
| Quality Approach Ltd | Wholesale & retail | 2019 |
| Quality Care Bristol Limited | Health & social care | 2017 |
| Quality Catering Maintenance Limited | Manufacturing | 2001 |
| Quality Collectables Ltd | Wholesale & retail | 2023 |
| Quality Dentures Laboratory Ltd | Health & social care | 2024 |
| Quality Education Solutions Limited | Information & communication | 2003 |
| Quality Electrical (Bristol) Limited | Construction | 2006 |
| Quality Electrical Distributors (Plymouth) Limited | Professional & scientific | 1997 |
| Quality Engineering Services (Bristol) Limited | Construction | 2003 |
| Quality First and Foremost Care Limited | Health & social care | 2021 |
| Quality GUY Ltd | Information & communication | 2024 |
| Quality Hmos Ltd | Real estate | 2025 |
| Quality Media Supplies Limited | Wholesale & retail | 2012 |
| Quality Products General Engineering (Wickwar) Limited | Manufacturing | 1975 |
| Quan Technology Limited | Wholesale & retail | 2025 |
| Quan UK Ltd | Wholesale & retail | 2019 |
| Quant Performance Ltd | Wholesale & retail | 2024 |
| Quanta South West Limited | Professional & scientific | 2015 |
| Quantail Ltd | Professional & scientific | 2025 |
| Quantanex Tech Ltd | Other services | 2023 |
| Quantangle Limited | Professional & scientific | 2025 |
| Quantec Consulting Limited | Professional & scientific | 2009 |
| Quantec Surveyors Ltd | Professional & scientific | 2016 |
| Quantick Safety Systems Limited | Construction | 2001 |
| Quantock Electrical Services Ltd | Construction | 2015 |
| Quantrill & Quantrill Ltd | Professional & scientific | 2024 |
| Quantum Brews Limited | Hospitality | 2024 |
| Quantum Construction Consultants Ltd | Construction | 2008 |
| Quantum Light Ltd | Financial services | 2013 |
| Quantum Ortho Limited | Health & social care | 2009 |
| Quantum Strategic Consultancy Services Limited | Professional & scientific | 2015 |
| Quantum Surveying & Estimating Ltd | Professional & scientific | 2014 |
| Quantum Valebat Management Limited | Professional & scientific | 2000 |
| Quantum Wave Ltd | Information & communication | 2018 |
| Quantum Wealth Innovations Ltd | Hospitality | 2024 |
| Quantumq Tech Consulting Limited | Information & communication | 2025 |
| Quarry and Earthworks Limited | Agriculture & fishing | 2015 |
| Quarry Cottages Limited | Households | 2012 |
| Quarry Fold Cromhall Management Company Limited | Households | 2026 |
| Quarry House Management Company (Clifton) Limited | Administrative & support | 2007 |
| Quarta Energy Ltd | Manufacturing | 2023 |
| Quarter Panda Ltd | Hospitality | 2019 |
| Quartet Community Foundation | Information & communication | 2000 |
| Quartey ID Ltd | Extraterritorial | 2025 |
| Quartey Interior Design Ltd | Extraterritorial | 2018 |
| Quartz Brokers London (Advertising) Ltd | Financial services | 2026 |
| Quartz Brokers London Limited | Financial services | 2025 |
| Quartz Holdings Limited | Financial services | 2022 |
| Quartz Insurance Brokers Limited | Financial services | 2008 |
| Quartz Trading Limited | Hospitality | 2019 |
| Quasar Limited | Wholesale & retail | 2013 |
| Quatum Liep Limited | Real estate | 2026 |
| Quay Business Management Consultancy Limited | Professional & scientific | 2015 |
| Quay Club Plymouth Limited | Financial services | 2021 |
| Quay Media Solutions Limited | Information & communication | 1992 |
| Quay Street Financing Limited | Professional & scientific | 2010 |
| Quay Street Property Ltd | Real estate | 2018 |
| Quayseco Limited | Professional & scientific | 1988 |
| Quayside Financial Ltd | Financial services | 2009 |
| Quayside Mortgages Limited | Financial services | 2023 |
| Quaytime Limited | Manufacturing | 2002 |
| Quebecor World PLC | Manufacturing | 1965 |
| Quedgeley Urban Village Limited | Real estate | 1999 |
| Queen and Whippet Catering Ltd | Hospitality | 2019 |
| Queen Anne Court (Quedgeley) Limited | Real estate | 2008 |