| QK Hub Ltd | Wholesale & retail | 2026 |
| QKI Food Stores Ltd | Wholesale & retail | 2019 |
| QKL Transport Ltd | Transport & logistics | 2025 |
| Qmph Limited | Real estate | 2007 |
| Qorra PAY Ltd | Information & communication | 2026 |
| QQ Cars Ltd | Wholesale & retail | 2020 |
| QRS London Ltd | Wholesale & retail | 2019 |
| QS Security & Services Ltd | Information & communication | 2022 |
| QS Wholesale Ltd | Wholesale & retail | 2026 |
| Qsdls Limited | Construction | 2014 |
| Quadelle Ltd | Real estate | 2014 |
| Quadm Solutions Ltd | Manufacturing | 2008 |
| Quadrant Care Services Ltd | Administrative & support | 2019 |
| Quadranz Ltd | Wholesale & retail | 2024 |
| Qualex Solutions Ltd | Professional & scientific | 2016 |
| Qualicity Limited | Information & communication | 2012 |
| Qualified Training Solutions Ltd | Education | 2015 |
| Qualitair Aviation Group Limited | Administrative & support | 1991 |
| Qualitair Aviation Services Limited | Manufacturing | 1987 |
| Quality Bespoke Interiors Limited | Administrative & support | 2012 |
| Quality Care (Surrey) Limited | Health & social care | 2003 |
| Quality Carpet & Furniture Limited | Wholesale & retail | 2008 |
| Quality Craftsmen Limited | Construction | 2024 |
| Quality Crops (UK) Limited | Hospitality | 2011 |
| Quality Food Luton Limited | Hospitality | 2018 |
| Quality Furniture World Ltd | Wholesale & retail | 2019 |
| Quality Groceries Ltd | Wholesale & retail | 2024 |
| Quality Investment Ltd | Real estate | 2026 |
| Quality Music Limited | Arts & recreation | 2011 |
| Quality Road Construction Ltd | Construction | 2024 |
| Quality Software Testing (QST) Ltd | Information & communication | 2012 |
| Quality Stone Drives & Patios Limited | Administrative & support | 2013 |
| Quality Trade Ltd | Construction | 2018 |
| Quality Used Tyres Ltd | Wholesale & retail | 2020 |
| Qualityvedh Ltd | Professional & scientific | 2018 |
| Quantaplexus Ltd | Information & communication | 2018 |
| Quantara Digital Ltd | Information & communication | 2026 |
| Quantum Data Processor Ltd | Information & communication | 2022 |
| Quantum Reach Ltd | Professional & scientific | 2024 |
| Quantum Ridge Solutions Ltd | Information & communication | 2026 |
| Quantum Skills Constructions Limited | Construction | 2010 |
| Quantumbyte Global Networks Limited | Information & communication | 2025 |
| Quanxora Ltd | Wholesale & retail | 2026 |
| Quartercloud Ltd | Information & communication | 2014 |
| Quartz Lifestyle Limited | Construction | 2021 |
| Quay Management Services Ltd | Real estate | 2020 |
| Quazis Limited | Wholesale & retail | 2023 |
| Quaztec Limited | Wholesale & retail | 2020 |
| Quba Accountancy Ltd | Professional & scientific | 2017 |
| Quba Trust | Other services | 2014 |
| Qubix IT Ltd | Information & communication | 2025 |
| QUE Spice Limited | Hospitality | 2025 |
| Queensway Shopping Limited | Real estate | 2020 |
| Quemar Ltd | Professional & scientific | 2015 |
| Questcorrt Ltd | Wholesale & retail | 2025 |
| Questfreelancers Ltd | Information & communication | 2024 |
| Quick Airport Transfers Limited | Transport & logistics | 2022 |
| Quick Business Services Ltd | Wholesale & retail | 2013 |
| Quick Cars Claim Limited | Wholesale & retail | 2024 |
| Quick Cash for Homes Limited | Real estate | 2016 |
| Quick Cleaning Services Ltd | Administrative & support | 2022 |
| Quick Creative Solutions Ltd | Construction | 2021 |
| Quick Lane Detailing Ltd | Wholesale & retail | 2025 |
| Quick Learn Driving School Ltd | Education | 2020 |
| Quick Mobiles & Computers Ltd | Wholesale & retail | 2022 |
| Quick Mobiles Ltd | Wholesale & retail | 2020 |
| Quick Pick DEALS1 Ltd | Wholesale & retail | 2025 |
| Quick Run Ltd | Transport & logistics | 2012 |
| Quick Sale Limited | Wholesale & retail | 2023 |
| Quickex Logistics Ltd | Transport & logistics | 2024 |
| Quickfindshub Ltd | Wholesale & retail | 2025 |
| Quickshop Ltd | Wholesale & retail | 2025 |
| Quickstart Retail Ltd | Wholesale & retail | 2015 |
| Quill Construction Services Ltd | Construction | 2018 |
| Quinn Essential Ltd | Professional & scientific | 2019 |
| Quinn Plant Hire Ltd | Administrative & support | 2020 |
| Quinn Project Managers Limited | Construction | 2015 |
| Quintessentially Spice Ltd | Hospitality | 2020 |
| Quintex Formation Ltd | Administrative & support | 2014 |
| Quinton Health Care Ltd | Health & social care | 2026 |
| Qureshi and Co Properties Limited | Real estate | 2025 |
| Qureshi and Sons Ltd | Water & waste | 2023 |
| QW Pharma UK Ltd | Professional & scientific | 2016 |
| QW Property Investment Limited | Real estate | 2020 |
| R & H Frozen Food Ltd | Wholesale & retail | 2025 |
| R a Consultancy Group Ltd | Education | 2020 |
| R a Maintenance Limited | Construction | 2018 |
| R Civils Ltd | Construction | 2019 |
| R D & R Limited | Real estate | 2003 |
| R D Cars Limited | Wholesale & retail | 2013 |
| R E Tyres and Servicing Ltd | Wholesale & retail | 2018 |
| R G P Investments Limited | Information & communication | 2002 |
| R Halimi Ltd | Construction | 2026 |
| R J T Cummins Ltd | Construction | 2019 |
| R Kazmi GT Ltd | Information & communication | 2025 |
| R L Property Developments Ltd | Real estate | 2023 |
| R Luxury Cars Limited | Other services | 2022 |
| R M Property Investments Ltd | Real estate | 2020 |
| R Moore Construction Ltd | Construction | 2026 |
| R N P Services Ltd | Construction | 2023 |