| Pyramid Pharma 7 Ltd | Wholesale & retail | 2021 |
| Pyramid Protection Ltd | Administrative & support | 2025 |
| Pyrocel Limited | Administrative & support | 1989 |
| PZ Newco Holdings Limited | Arts & recreation | 2025 |
| PZ Newco Limited | Financial services | 2020 |
| PZ Newco Propco 1 Limited | Real estate | 2026 |
| Q Hair Design (Ponteland) Limited | Other services | 2006 |
| Q OFF Licence NCL Ltd | Wholesale & retail | 2021 |
| Q PUB Co Limited | Hospitality | 2024 |
| Q&Q Builders Ltd | Construction | 2024 |
| Q&W Services Ltd | Professional & scientific | 2021 |
| Q-Soft Integrated Limited | Information & communication | 2026 |
| QA Logistics Solutions Ltd | Transport & logistics | 2023 |
| QAGDORM1 Ltd | Extraterritorial | 2009 |
| QAGDORM6 Ltd | Professional & scientific | 2009 |
| QAGDORM8 Ltd | Extraterritorial | 2018 |
| Qamar's Trading Limited | Wholesale & retail | 2025 |
| Qandil Barber Shop Ltd | Other services | 2016 |
| Qantara International Ltd | Wholesale & retail | 2020 |
| Qasta Limited | Health & social care | 2025 |
| Qatarat Wanada Alanbar Company Ltd | Wholesale & retail | 2025 |
| Qbicart Ltd | Arts & recreation | 2023 |
| QC Investments Limited | Real estate | 2013 |
| QE2 (Welwyn Garden City) Management Company Limited | Households | 2016 |
| Qgems Energy Ltd | Information & communication | 2021 |
| Qgems Limited | Information & communication | 2024 |
| QH Investments (NE) Ltd | Real estate | 2019 |
| Qhse Systems Limited | Professional & scientific | 2014 |
| Qiaochu Catering Management Ltd | Hospitality | 2018 |
| Qiaochu Group Ltd | Real estate | 2022 |
| Qiaochu Retail Management Ltd | Wholesale & retail | 2021 |
| QINOV8 UK Limited | Water & waste | 2016 |
| Qiyuan Ltd | Hospitality | 2021 |
| QK Executive Search & Consulting Ltd | Administrative & support | 2025 |
| Qleen PAY Ltd | Information & communication | 2025 |
| QMF (Northern) Limited | Manufacturing | 2001 |
| QMS Services North East Ltd | Professional & scientific | 2020 |
| Qnyl Ltd | Transport & logistics | 2025 |
| Qorali Ltd. | Administrative & support | 2024 |
| QR Private Medical Services Limited | Health & social care | 2023 |
| Qsqa Limited | Hospitality | 2025 |
| QT Regions Limited | Information & communication | 2021 |
| QU Build Ltd | Real estate | 2023 |
| Quadrant Law Ltd | Professional & scientific | 2014 |
| Qual-E Holdings Limited | Administrative & support | 2024 |
| Quality Evolution Services Limited | Information & communication | 2024 |
| Quality Foods Services Ltd | Hospitality | 2017 |
| Quality Global Ltd | Education | 2023 |
| Quality Pizza (Throckley) Ltd | Hospitality | 2018 |
| Quality Pizza DH5 9LX Ltd | Hospitality | 2024 |
| Quality Pizza Harrim Ltd | Hospitality | 2021 |
| Quality Wholesale Testers Limited | Wholesale & retail | 2017 |
| Quanah Group Limited | Financial services | 2021 |
| Quani Sound Ltd. | Information & communication | 2015 |
| Quantified Tree Surveys Limited | Agriculture & fishing | 2009 |
| Quantify R&D Limited | Information & communication | 2013 |
| Quantum Analysis Energy Limited | Professional & scientific | 2018 |
| Quantum Quayside Limited | Wholesale & retail | 2025 |
| Quantum Structures Ltd | Professional & scientific | 2019 |
| Quantumdx Group Limited | Health & social care | 2008 |
| Quartz Future Consulting Ltd | Administrative & support | 2024 |
| Quasam Limited | Administrative & support | 1981 |
| Quatro Irmãos Ltd | Real estate | 2023 |
| Quattro Frateli (Newcastle) Limited | Extraterritorial | 2024 |
| Quay Life Wealth Management Ltd | Financial services | 2021 |
| Quay North LLP | | 2003 |
| Quay Park (Pelaw) Management Company Limited | Households | 2004 |
| Quay Point Maintenance Ltd | Construction | 2026 |
| Quay Solution: Financial Management Limited | Professional & scientific | 2012 |
| Quay Timber Ltd | Wholesale & retail | 2011 |
| Quayline Developments Limited | Other services | 2026 |
| Quayside (Newcastle Upon Tyne) Management Company NO. 3 Limited | Households | 1998 |
| Quayside (Newcastle-Upon-Tyne) Management Company NO.1 Limited | Real estate | 1997 |
| Quayside Car Sales Ltd | Wholesale & retail | 2023 |
| Quayside Coffee Company Newcastle Ltd | Wholesale & retail | 2024 |
| Quayside Financial Services Limited | Professional & scientific | 2025 |
| Quayside Mortgage Group Limited | Financial services | 2023 |
| Quayside Property Management Limited | Households | 2024 |
| Quayside View Ltd | Real estate | 2024 |
| Qubic Advisory Holdings Limited | Financial services | 2018 |
| Qubic Advisory Partners Limited | Professional & scientific | 2019 |
| Qubic Advisory Services Limited | Administrative & support | 2013 |
| Qubic Associate Group Limited | Professional & scientific | 2009 |
| Qubic Fiduciaries Holdings Limited | Professional & scientific | 2019 |
| Qubic Fiduciaries Limited | Professional & scientific | 2019 |
| Qubic Partners Ltd | Administrative & support | 2009 |
| Qubic Tax Advisory Limited | Administrative & support | 2016 |
| Qubic Tax Investigations Limited | Extraterritorial | 2018 |
| Qubic Trustees Ltd | Professional & scientific | 2009 |
| Qudos Professional Services Limited | Administrative & support | 2005 |
| QUE Chivo Salvadoran Store Ltd | Wholesale & retail | 2023 |
| QUE Court Ltd. | Households | 1997 |
| Queens at Heart Ltd | Wholesale & retail | 2019 |
| Queensgate Stockton Management Company Limited | Real estate | 2016 |
| Queensgate Yarm Management Company Limited | Households | 2012 |
| Queensway Hospitality Group Limited | Financial services | 2022 |
| Queensway Inns Holdco Limited | Financial services | 2026 |
| Queensway Inns Midco Limited | Financial services | 2026 |
| Queensway Inns Opco 1 Limited | Hospitality | 2026 |
| Queensway Inns Opco 2 Limited | Hospitality | 2026 |