| Queniborough Hall Management Company Limited | Households | 2000 |
| Quest Building Services Ltd | Construction | 2025 |
| Quest Business Services Limited | Professional & scientific | 2006 |
| Quest Comm Limited | Other services | 2018 |
| Quest Design and Build Limited | Construction | 2025 |
| Quest Roofing Ltd | Construction | 2024 |
| QUEST2 Ltd | Manufacturing | 2015 |
| Questdeal Limited | Other services | 2021 |
| Questech Limited | Information & communication | 2024 |
| Questimate Services Limited | Extraterritorial | 2016 |
| Quick & Clean Constructions Ltd | Construction | 2025 |
| Quick Build Hub Ltd | Wholesale & retail | 2026 |
| Quick Cargo 24/7 Limited | Transport & logistics | 2025 |
| Quick Courier Transport UK Ltd | Transport & logistics | 2025 |
| Quick Double Glazing Ltd | Construction | 2021 |
| Quick Exchange Ltd | Wholesale & retail | 2012 |
| Quick Hire Experts U.K. Ltd | Construction | 2025 |
| Quick Insure Cover Limited | Financial services | 2025 |
| Quick Maths Academy Ltd | Education | 2025 |
| Quick PAY Solutions Ltd | Administrative & support | 2023 |
| Quick Response Construction Ltd | Construction | 2026 |
| Quick Send Xpress Limited | Transport & logistics | 2020 |
| Quick Stop 24/7 Ltd | Wholesale & retail | 2026 |
| Quick Touch Ltd | Manufacturing | 2020 |
| Quick Track Transports Ltd | Transport & logistics | 2025 |
| Quick Tyre Fit Ltd | Wholesale & retail | 2025 |
| QUICK2FIX Ltd | Other services | 2016 |
| Quickcars Limited | Transport & logistics | 2005 |
| Quickfix Plumbing and Heating Ltd | Construction | 2008 |
| Quickfoodz Ltd | Hospitality | 2025 |
| Quickfox Properties Ltd | Real estate | 2020 |
| Quickhydrate Ltd | Wholesale & retail | 2025 |
| Quickmoverss Ltd | Transport & logistics | 2026 |
| Quickquote Limited | Information & communication | 1990 |
| Quicksell Limited | Other services | 2025 |
| Quickthorns Residents Limited | Other services | 1998 |
| Quickway (Leic) Limited | Wholesale & retail | 2002 |
| Quickwheels Logistics Ltd. | Transport & logistics | 2024 |
| Quickzone Services Ltd | Wholesale & retail | 2025 |
| Quidhampton Ltd | Transport & logistics | 2015 |
| Quidity Limited | Professional & scientific | 2019 |
| Quidstop Limited | Wholesale & retail | 2014 |
| Quietminds Limited | Professional & scientific | 2025 |
| Quiktools Limited | Wholesale & retail | 2010 |
| Quill Editorial Ltd | Information & communication | 2025 |
| Quilteez Ltd | Manufacturing | 2015 |
| Quinn Care UK Ltd | Health & social care | 2022 |
| Quinn Consulting and Training Limited | Professional & scientific | 2013 |
| Quinn Contracts Limited | Manufacturing | 2018 |
| Quinn Electrical Contractors Ltd | Construction | 2025 |
| Quinn Property Group Ltd | Real estate | 2025 |
| Quinn Residential Developments Limited | Construction | 2014 |
| Quintessa One Limited | Professional & scientific | 2021 |
| Quis Limited | Professional & scientific | 2020 |
| Quissor Ltd | Construction | 2023 |
| Quizhold Limited | Hospitality | 1979 |
| Quluub Global Enterprises Ltd | Health & social care | 2024 |
| Quluub Medical Solutions Ltd | Health & social care | 2024 |
| Quorn BP Management Limited | Households | 2019 |
| Quorn Country Foods Limited | Manufacturing | 1995 |
| Quorn Court Management Company Limited | Households | 1977 |
| Quorn FC Leisure Ltd | Wholesale & retail | 2017 |
| Quorn Pre-School Limited | Health & social care | 2012 |
| Quorn Sports and Classics Ltd | Wholesale & retail | 2017 |
| Qurate Ltd | Professional & scientific | 2024 |
| Qwerty Properties Limited | Real estate | 2024 |
| Qwerty Retail Ltd | Wholesale & retail | 2023 |
| Qwik Cart Ltd | Wholesale & retail | 2024 |
| R & a Global Logistics Ltd | Transport & logistics | 2021 |
| R & a Healthcare Ltd | Real estate | 2020 |
| R & a Leicester Ltd | Real estate | 2019 |
| R & B Joinery Limited | Construction | 2001 |
| R & C Tucker Limited | Manufacturing | 2005 |
| R & D Airsoft Ltd | Wholesale & retail | 2026 |
| R & D Convenience Stores Limited | Administrative & support | 2002 |
| R & D Developments (UK) Limited | Construction | 2006 |
| R & D Supermarket Limited | Wholesale & retail | 2017 |
| R & D Waste Limited | Wholesale & retail | 2014 |
| R & E Evans Holdings Ltd | Financial services | 2026 |
| R & G Textiles Limited | Wholesale & retail | 1999 |
| R & H Healthcare Services Ltd | Health & social care | 2026 |
| R & H James Property Ltd | Real estate | 2024 |
| R & I Logistics Ltd | Wholesale & retail | 2018 |
| R & J Venues Ltd | Hospitality | 2019 |
| R & Jay's Special Projects Limited | Real estate | 2001 |
| R & K Group Ltd | Manufacturing | 2019 |
| R & M Higgs Limited | Administrative & support | 2003 |
| R & M Services Ltd | Administrative & support | 2023 |
| R & N Store Limited | Wholesale & retail | 2026 |
| R & P Sales & Lettings Ltd | Real estate | 2012 |
| R & S Entertainment Ltd | Arts & recreation | 2022 |
| R & S Fashion World Ltd | Manufacturing | 2018 |
| R & S Holdco Limited | Financial services | 2016 |
| R & S Investment Management Ltd | Professional & scientific | 2011 |
| R & S Logistics Ltd | Transport & logistics | 2024 |
| R & Sons Investments Limited | Real estate | 2013 |
| R & T Electrical Ltd | Construction | 2021 |
| R & T Medical Ltd | Health & social care | 2025 |
| R & W Harrison Builders Limited | Construction | 2003 |
| R a Parmar Limited | Health & social care | 2010 |