| QB Design & Build Ltd | Construction | 2021 |
| QB Land & Property Ltd | Construction | 2021 |
| Qbix Ltd | Health & social care | 2018 |
| QCR Investments Limited | Real estate | 2015 |
| QE360 Ltd | Information & communication | 2024 |
| Qegp (Qesther Global Prayer) | Other services | 2013 |
| Qelgroup Ltd | Administrative & support | 2026 |
| QHA Kazmi Ltd | Wholesale & retail | 2014 |
| Qhopper Limited | Professional & scientific | 2016 |
| Qkey Ltd | Wholesale & retail | 2025 |
| QL Freeholders Limited | Households | 2025 |
| Qmed Staffing Ltd | Professional & scientific | 2015 |
| Qmode Ltd | Construction | 2019 |
| Qome Limited | Information & communication | 2026 |
| QQ Trade Solutions Ltd | Wholesale & retail | 2025 |
| QR Invite Ltd. | Public administration | 2025 |
| QT Assure Ltd | Professional & scientific | 2019 |
| Quacking Coffee Ltd | Wholesale & retail | 2023 |
| Quadra Quick Limited | Wholesale & retail | 2022 |
| Quadrant Advisory Services Limited | Professional & scientific | 2022 |
| Quadrant Resources Ltd | Transport & logistics | 2018 |
| Quaerito Ltd | Wholesale & retail | 2024 |
| Quafum Care Services Limited Limited | Health & social care | 2020 |
| Quail Properties Limited | Real estate | 2013 |
| Qualicheck Technologies Limited | Information & communication | 2023 |
| Qualified Training Ltd | Administrative & support | 2024 |
| Quality Build Innovation Ltd | Construction | 2025 |
| Quality Carpet & Flooring Ltd | Wholesale & retail | 2020 |
| Quality Homes Romford Limited | Construction | 2024 |
| Quality Local Services Ltd | Construction | 2025 |
| Quality Medicolegal Limited | Health & social care | 2015 |
| Quality of Coats Ltd | Construction | 2025 |
| Quality Traders Ltd | Wholesale & retail | 2018 |
| Qualitybuy Ltd | Wholesale & retail | 2024 |
| Quansah Consultancy Ltd | Professional & scientific | 2020 |
| Quantam Engineering Ltd | Professional & scientific | 2024 |
| Quantico Limited | Wholesale & retail | 2026 |
| Quantiv Solutions Ltd | Transport & logistics | 2026 |
| Quantum Cars Limited | Wholesale & retail | 2014 |
| Quantum Engineered Design Limited | Construction | 2017 |
| Quantum Nova Consulting Limited | Information & communication | 2025 |
| Quantum United Limited | Real estate | 2023 |
| Quarantine Clean Grills Ltd | Manufacturing | 2025 |
| Quarry House Investments Limited | Administrative & support | 2014 |
| Quarry-Quest Associates Limited | Professional & scientific | 2024 |
| Queen Hair & Beauty & Nails Ltd | Real estate | 2025 |
| Quercus Contracts Ltd | Construction | 2014 |
| Quest Entertainment Service Ltd | Administrative & support | 2019 |
| Quick Accounting Ltd | Professional & scientific | 2017 |
| Quick Care Ltd | Administrative & support | 2018 |
| Quick Ecom by Mehran Ltd | Wholesale & retail | 2025 |
| Quick FIX Maintence Ltd | Construction | 2025 |
| Quick Motor Repairs Ltd | Other services | 2015 |
| Quick Service Carpet and Flooring Ltd | Construction | 2025 |
| Quick Skyrange Ltd | Real estate | 2020 |
| Quick Solz Limited | Information & communication | 2010 |
| Quick Stop Autos Ltd | Wholesale & retail | 2020 |
| Quickbuy Central Limited | Transport & logistics | 2024 |
| Quickfix Guttering Supplies Ltd | Wholesale & retail | 2020 |
| Quickpayment UK Ltd | Professional & scientific | 2018 |
| Quickscale Ltd | Financial services | 2022 |
| Quidos Care Ltd | Health & social care | 2025 |
| Quidos Group Limited | Real estate | 2024 |
| Quigley Recrutare UK Ltd | Administrative & support | 2021 |
| Quiktrack Ltd | Transport & logistics | 2025 |
| Quinn Development Holdings Ltd | Construction | 2016 |
| Quinn Investment Holdings (London) Limited | Financial services | 2013 |
| Quinn London Trustee Limited | Extraterritorial | 2026 |
| Quinn Residential Holdings Limited | Construction | 2021 |
| Quinn Residential Limited | Real estate | 2013 |
| Quinotech Ltd | Information & communication | 2025 |
| Quinta Sales Ltd | Professional & scientific | 2025 |
| Quintx Limited | Professional & scientific | 2024 |
| Quirkey's Bagels Limited | Manufacturing | 2020 |
| Quiro.Mag Ltd | Information & communication | 2025 |
| Quite Security Services Ltd | Administrative & support | 2025 |
| Quorum (Perranporth) Limited | Real estate | 2024 |
| Qutbiz Enterprise Limited | Wholesale & retail | 2023 |
| R & L Health Consultancy Ltd | Arts & recreation | 2015 |
| R & M Glazing Services Limited | Construction | 2004 |
| R & S Coffee & Croissant Ltd | Hospitality | 2026 |
| R & V Hair & Beauty Ltd | Other services | 2017 |
| R and C Interiors Limited | Construction | 2014 |
| R D Simmons Specialist Transport Ltd | Transport & logistics | 2008 |
| R FOX Data Ltd | Information & communication | 2025 |
| R J Hollingworth Estates Ltd | Real estate | 2016 |
| R K Landscaping Ltd | Administrative & support | 2022 |
| R K Prime Speed X Ltd Ltd | Transport & logistics | 2026 |
| R M Dowie Ltd | Wholesale & retail | 2016 |
| R M Flat Roofing Services Limited | Construction | 2025 |
| R M One Ltd | Real estate | 2007 |
| R R Cells Limited | Manufacturing | 2023 |
| R R G Consultancy Ltd | Professional & scientific | 2023 |
| R Ross Consulting Ltd | Professional & scientific | 2013 |
| R S K Tyres Limited | Wholesale & retail | 2004 |
| R S Scaffolding Services Limited | Construction | 2007 |
| R Sandhu Holdings Limited | Professional & scientific | 2025 |
| R&A Elite Property Ltd | Real estate | 2026 |
| R&B Treatments and Aesthetics Limited | Other services | 2025 |
| R&C Transport Solutions Ltd | Transport & logistics | 2021 |