| Q Box Media Ltd | Construction | 2016 |
| Q Branch Consulting Limited | Professional & scientific | 2006 |
| Q E D Public Relations Limited | Administrative & support | 1991 |
| Q Structures Limited | Construction | 2015 |
| Q&Q Builders Derby Limited | Construction | 2025 |
| Q&R Hire Limited | Administrative & support | 2026 |
| Q-Layer UK Ltd | Professional & scientific | 2024 |
| Q-Sail Limited | Financial services | 2024 |
| QA Flex Drive Ltd | Transport & logistics | 2025 |
| Qagec Ltd | Professional & scientific | 2022 |
| Qais Travel Ltd | Transport & logistics | 2023 |
| Qapro Ltd | Professional & scientific | 2023 |
| Qardfast Limited | Information & communication | 2025 |
| QAS Property Ltd | Real estate | 2023 |
| Qashqade UK Ltd | Information & communication | 2022 |
| Qayyum Meadows Limited | Real estate | 2023 |
| Qaziatta Ltd | Transport & logistics | 2026 |
| Qbecom Ltd | Wholesale & retail | 2026 |
| QBL Consultants Limited | Professional & scientific | 2018 |
| Qcomerce Ltd | Wholesale & retail | 2026 |
| Qeetu Limited | Other services | 2019 |
| Qhall Investments Limited | Real estate | 2024 |
| Qinesis Ltd | Professional & scientific | 2025 |
| Qinesis Marketing Limited | Professional & scientific | 2004 |
| Qinggiao LIU Limited | Wholesale & retail | 2026 |
| QK Solution Ltd. | Construction | 2025 |
| Qkamba Ltd | Wholesale & retail | 2019 |
| QL Services Ltd | Transport & logistics | 2022 |
| Qmdent Ltd | Health & social care | 2025 |
| Qpaints Limited | Wholesale & retail | 2009 |
| QS Curry Cartel Ltd | Hospitality | 2025 |
| QS Property Limited | Real estate | 2025 |
| QS360 Ltd | Professional & scientific | 2023 |
| QSC Safety Limited | Professional & scientific | 2012 |
| Quad Glassy Ltd | Hospitality | 2022 |
| Quadralene Holdings Limited | Financial services | 2017 |
| Quadralene Limited | Manufacturing | 1930 |
| Quadrivetta Ltd | Professional & scientific | 2026 |
| Qualicius Ltd | Information & communication | 2026 |
| Qualicon Lofts Limited | Construction | 2014 |
| Qualisoft Limited | Information & communication | 2013 |
| Quality & Safety Services Limited | Professional & scientific | 1995 |
| Quality Car Wash Derby Limited | Other services | 2022 |
| Quality Centred Care Ltd | Administrative & support | 2024 |
| Quality Control Technology Limited | Administrative & support | 2002 |
| Quality Engineering and Inspection Services Limited | Professional & scientific | 2013 |
| Quality Home Care UK Limited | Health & social care | 2006 |
| Quality Home Services (Derby) Limited | Construction | 2000 |
| Quality Recycling Machinery Solutions Ltd | Wholesale & retail | 2010 |
| Quality Safety Consultants Limited | Administrative & support | 2000 |
| Quality Sign Company (Midlands) Limited | Manufacturing | 2015 |
| Quality SIX Sigma Limited | Professional & scientific | 2009 |
| Qualityculture Ltd | Professional & scientific | 2002 |
| Quantica Labs Ltd | Information & communication | 2026 |
| Quantis Construction Services Ltd | Professional & scientific | 2025 |
| Quantity Survey & Estimating Ltd | Construction | 2022 |
| Quantivus Consultants Limited | Professional & scientific | 2026 |
| Quantock Properties Limited | Real estate | 1993 |
| Quantum Event Marketing Services Limited | Professional & scientific | 2011 |
| Quantum Impact Ltd | Professional & scientific | 2023 |
| Quantum Links Trading Limited | Wholesale & retail | 2025 |
| Quantum NEX Limited | Information & communication | 2024 |
| Quantum Product Development Ltd | Manufacturing | 2023 |
| Quantum Trading Limited | Wholesale & retail | 2025 |
| Quarndon Engineering Limited | Professional & scientific | 2023 |
| Quarndon Events Limited | Arts & recreation | 2023 |
| Quarndon Heights Residents Management Company Limited | Real estate | 2018 |
| Quarnmill Construction Limited | Construction | 1999 |
| Quarry Lake Content Limited | Professional & scientific | 2022 |
| Quartz Refinish Limited | Extraterritorial | 2014 |
| Quay Minerals Limited | Extraterritorial | 1992 |
| Qubark Ltd | Information & communication | 2014 |
| Qube Consulting Limited | Extraterritorial | 2010 |
| Qube Hire Services Limited | Administrative & support | 2023 |
| Quco Ltd | Wholesale & retail | 2021 |
| Queen BEE Gym Clothing Limited | Wholesale & retail | 2023 |
| Queen Mary Court (Management Company) Limited | Households | 2018 |
| Queensbury Lodge Management Company Limited | Households | 2012 |
| Quest Global Engineering Limited | Professional & scientific | 2011 |
| Quest Select Business Services Limited | Professional & scientific | 2012 |
| QUEST4SEZ Limited | Health & social care | 2024 |
| Quick Fast Logistics Ltd | Transport & logistics | 2026 |
| Quick Fonez Ltd | Wholesale & retail | 2025 |
| Quick Racing Engineering Ltd | Professional & scientific | 2026 |
| Quickcrow Ltd | Information & communication | 2020 |
| Quicksilver Midco Limited | Financial services | 2011 |
| Quicksponse Ltd | Transport & logistics | 2024 |
| Quiet Path Holdings Ltd | Information & communication | 2026 |
| Quiet the Mind Events Limited | Health & social care | 2017 |
| Quill & Gram Ltd | Information & communication | 2025 |
| Quill Design and Engineering Services Limited | Manufacturing | 2023 |
| Quill International Industries Ltd | Extraterritorial | 2016 |
| Quill International Lifting & Certification Limited | Manufacturing | 2019 |
| Quinn Driveways Limited | Construction | 2020 |
| Quinn Groundworks Limited | Construction | 2017 |
| Quintana JD Limited | Wholesale & retail | 2025 |
| QUINTE5SENCE Limited | Professional & scientific | 2015 |
| Quinton Crane Electronics Limited | Manufacturing | 2000 |
| Quiz Night OUT Ltd | Arts & recreation | 2023 |
| Quorn Property Limited | Extraterritorial | 2007 |