| QUEST4CARS Limited | Wholesale & retail | 2025 |
| Questberry Group Limited | Administrative & support | 2017 |
| Questlynk Ltd | Education | 2025 |
| Quetzhetbiar Residential Ltd | Households | 2017 |
| Quevitta Ltd | Information & communication | 2025 |
| Quex Property Holdings Ltd | Construction | 2025 |
| Quibirtek PC | | 2021 |
| Quick & Reliable Trading Ltd | Wholesale & retail | 2019 |
| Quick Basket Store Limited | Wholesale & retail | 2025 |
| Quick Building Solutions Limited | Manufacturing | 2026 |
| Quick Cash 4 Cars Ltd | Wholesale & retail | 2026 |
| Quick Certification Limited | Construction | 2016 |
| Quick Constuction Ltd | Construction | 2012 |
| Quick Ecom by Arslan Limited | Wholesale & retail | 2025 |
| Quick Fast Delivery Service Ltd | Transport & logistics | 2019 |
| Quick Home Buyers Limited | Real estate | 2012 |
| Quick Move 24/7 Ltd | Administrative & support | 2018 |
| Quick Office Search Ltd | Professional & scientific | 2013 |
| Quick Shoppe Ltd | Wholesale & retail | 2023 |
| Quick Smart IT Limited | Information & communication | 2011 |
| Quick Technology Ltd | Wholesale & retail | 2026 |
| Quick,Son(South & West)Limited | Construction | 1964 |
| Quickcartz Trades Limited | Wholesale & retail | 2025 |
| Quickconnect Workforce Ltd | Administrative & support | 2023 |
| Quickdrop Services Limited | Transport & logistics | 2025 |
| Quicker Business Solutions Limited | Other services | 2021 |
| Quickmoveit Ltd | Information & communication | 2018 |
| Quickmoveit Properties Limited | Real estate | 2022 |
| Quicknest Properties Ltd | Real estate | 2024 |
| Quickplumber and Co Ltd | Construction | 2024 |
| Quickqart Ltd | Wholesale & retail | 2024 |
| Quickstart Recruitment Agency Ltd | Administrative & support | 2021 |
| Quickvex Solutions Ltd | Professional & scientific | 2025 |
| Quidos Facilities Ltd | Health & social care | 2025 |
| Quidos Generate Limited | Energy | 2026 |
| Quidos Protect Compliance Limited | Administrative & support | 2026 |
| Quidos Protect Limited | Administrative & support | 2010 |
| Quiet River Saas Ltd | Information & communication | 2025 |
| Quikfix International Limited | Construction | 2019 |
| Quikr Ltd | Information & communication | 2015 |
| Quill and Quote Limited | Hospitality | 2022 |
| Quill Notaries LLP | | 2013 |
| Quill Sports Services Limited | Professional & scientific | 2016 |
| Quimik Foundation | Administrative & support | 2021 |
| Quin Bridging Finance Limited | Financial services | 2025 |
| Quin Freehold Limited | Real estate | 2016 |
| Quiney Ltd | Health & social care | 2022 |
| Quinn Mills Limited | Information & communication | 2022 |
| Quinn Property Investments Ltd | Real estate | 2017 |
| Quinn UK Holdings Limited | Professional & scientific | 2019 |
| Quinn's Training Services Limited | Education | 2013 |
| Quinnie Nail Ltd | Other services | 2024 |
| Quintessence Design Ltd | Wholesale & retail | 2020 |
| Quinton Law Limited | Professional & scientific | 2018 |
| Quinton&Co Limited | Construction | 2019 |
| Quiqi & Rich E-Commerce Ltd | Wholesale & retail | 2024 |
| Quirit Ltd | Professional & scientific | 2025 |
| Quiz Night Interactive Limited | Information & communication | 2021 |
| Quorivex Ltd | Education | 2025 |
| Quorix Solutions Limited | Professional & scientific | 2025 |
| Quorn Courtyard Gardens Limited | Construction | 2020 |
| Quorum Centre for Strategic Studies Limited | Administrative & support | 2016 |
| Quosept Solutions Ltd | Other services | 2019 |
| Quote Force Limited | Information & communication | 2018 |
| Quovance Ltd | Information & communication | 2021 |
| Quran Academy Ltd | Information & communication | 2017 |
| Quranabic Ltd | Education | 2025 |
| Qureshi Homes Limited | Real estate | 2024 |
| Qureshi Logistics Ltd | Transport & logistics | 2017 |
| Qusai Abdalgadir Ltd | Wholesale & retail | 2025 |
| Quub UK Ltd | Information & communication | 2023 |
| Quzus Ltd | Information & communication | 2019 |
| QVD Limited | Construction | 2019 |
| Qweaq Ltd | Information & communication | 2025 |
| Qwerty Property Limited | Real estate | 2023 |
| Qwinogo Digital Services Ltd | Wholesale & retail | 2014 |
| Qwod Technologies Ltd | Information & communication | 2024 |
| Qwrkee Foods Ltd | Wholesale & retail | 2017 |
| Qzee Ltd | Information & communication | 2020 |
| R & a Houses Limited | Real estate | 2022 |
| R & a Records Ltd | Information & communication | 2019 |
| R & B Music Limited | Wholesale & retail | 2009 |
| R & C Developments (SW) Limited | Real estate | 2023 |
| R & D Homes Limited | Real estate | 2024 |
| R & D Selection Limited | Wholesale & retail | 2017 |
| R & D Surgical Limited | Administrative & support | 2008 |
| R & E Groundcare Ltd | Construction | 2024 |
| R & E Landscapes & Fencing Contractor Limited | Administrative & support | 2020 |
| R & J Transport PVT Ltd | Transport & logistics | 2015 |
| R & L Carpentry Penarth Ltd | Construction | 2017 |
| R & N Nelson Property Ltd | Real estate | 2020 |
| R & P Mitra Limited | Health & social care | 2019 |
| R & R Consulting Centres Ltd | Real estate | 2004 |
| R & R Soul Ltd | Wholesale & retail | 2018 |
| R & S Barbers Ltd | Other services | 2017 |
| R & W Property Limited | Real estate | 2015 |
| R and J Coomber Surveying Services Ltd | Professional & scientific | 2014 |
| R Asif Medical Consulting Ltd | Health & social care | 2026 |
| R Bidder Ltd | Administrative & support | 2021 |
| R C Hospitality Limited | Administrative & support | 2017 |