| Purple Fish Services Ltd | Information & communication | 2013 |
| Purple Hair Salon Ltd | Other services | 2010 |
| Purple Spark Ltd | Information & communication | 2026 |
| Purr Digital Ltd | Information & communication | 2013 |
| Purr-Fect Place Cattery Limited | Other services | 2006 |
| Purslane Restaurant Ltd | Hospitality | 2012 |
| Pursloe Group Ltd | Other services | 2025 |
| Pursloe Property Maintenance Ltd | Other services | 2020 |
| Pusat DRY Cleaning and Laundry Ltd | Other services | 2025 |
| Pussy Willows Limited | Agriculture & fishing | 2016 |
| PVC Barnsley Limited | Water & waste | 2015 |
| PVC Collection Services Limited | Water & waste | 2018 |
| PVL Hire Ltd | Construction | 2024 |
| Pwapp Limited | Professional & scientific | 2015 |
| PWM Electrical & Mechanical Limited | Construction | 2011 |
| PY IP Consulting Limited | Professional & scientific | 2021 |
| Pyrus Close Management Limited | Households | 2024 |
| Pyxis Consulting (UK) Ltd | Professional & scientific | 2021 |
| Q & M Limited | Construction | 1992 |
| Q & M Trust Limited | Administrative & support | 2021 |
| Q&A Interior Design Ltd | Professional & scientific | 2006 |
| Q-Bot Insulation Limited | Construction | 2024 |
| Q-Bot Limited | Manufacturing | 2012 |
| Q-Files Limited | Information & communication | 2010 |
| Q-West Maintenance Solutions Ltd. | Administrative & support | 2005 |
| Q.B.D. Limited | Construction | 2001 |
| Qalam of Deen Ltd | Education | 2026 |
| Qalit Ltd | Professional & scientific | 2018 |
| QBD Windows and Doors Ltd | Construction | 2022 |
| QCO2 Limited | Financial services | 2014 |
| QDP (Devon) Ltd | Health & social care | 2011 |
| QED Market Research Limited | Real estate | 2006 |
| QEP-1 Limited | Professional & scientific | 2025 |
| QFO Ltd | Information & communication | 2026 |
| Qlogic Inc Ltd | Information & communication | 2018 |
| QNL Property Nominees Limited | Professional & scientific | 2023 |
| QP Battery Limited | Energy | 2020 |
| Qrqi Ltd. | Information & communication | 2016 |
| QS Americas Limited | Financial services | 2024 |
| QTR Transport Limited | Transport & logistics | 1977 |
| Quadrabay UK Limited | Information & communication | 2025 |
| Quadrangle Nominees (1989) Company | Administrative & support | 1982 |
| Quadrangle Nominees Limited | Administrative & support | 1990 |
| Quadrangle Trustee Company | Administrative & support | 1974 |
| Quadrangle Trustee Services Limited | Administrative & support | 1990 |
| Qualitas Altus Services Ltd | Construction | 2017 |
| Quality Cars (Bristol) Limited | Real estate | 1957 |
| Quality Health Tips Ltd | Health & social care | 2026 |
| Quality Purchasing Systems Ltd | Information & communication | 2002 |
| Quantaria Ltd | Information & communication | 2026 |
| Quantinev Limited | Wholesale & retail | 2025 |
| Quantum Global Ltd | Professional & scientific | 2000 |
| Quantum Performance Services Ltd | Construction | 2024 |
| Quantum Switch Admin Ltd | Other services | 2022 |
| Quantum Switch Austria Ltd | Other services | 2022 |
| Quantum Switch Czech Republic Ltd | Other services | 2022 |
| Quantum Switch Europe Ltd | Financial services | 2024 |
| Quantum Switch Finland Limited | Financial services | 2024 |
| Quantum Switch Greece Ltd | Other services | 2022 |
| Quantum Switch Group Services Limited | Financial services | 2022 |
| Quantum Switch Holdings Limited | Financial services | 2020 |
| Quantum Switch Limited | Construction | 2018 |
| Quantum Switch Norway Limited | Financial services | 2024 |
| Quantumfy Ltd | Information & communication | 2026 |
| Quay Project Solutions Ltd | Professional & scientific | 2022 |
| Queen's Road Court (Cheltenham) Limited | Households | 1987 |
| Queens Parade (Cheltenham) Management Company Limited | Households | 1980 |
| Queens Square Associates Limited | Professional & scientific | 2003 |
| Queensway Dental Laboratory Limited | Health & social care | 2014 |
| Queensway Group Holding Limited | Health & social care | 2017 |
| Queensway Orthodontics (East) Limited | Health & social care | 2018 |
| Queensway Orthodontics (North) Limited | Health & social care | 2018 |
| Queensway Orthodontics (South) Limited | Health & social care | 2018 |
| Queensway Orthodontics (West) Limited | Health & social care | 2018 |
| Queenwood Holidays Limited | Administrative & support | 2025 |
| Quella Bicycle Limited | Wholesale & retail | 2017 |
| Queltech Limited | Information & communication | 2025 |
| Quercus (Trading) Limited | Real estate | 1999 |
| Quercus Capital Rentals Limited | Administrative & support | 2011 |
| Quercus Holdings (2017) Limited | Financial services | 2017 |
| Quercus Renewables (Mypower) Limited | Construction | 2017 |
| Questant Limited | Professional & scientific | 2020 |
| Quick Beauty Labs Ltd | Wholesale & retail | 2026 |
| Quickcutfx Ltd | Professional & scientific | 2026 |
| Quikquak Limited | Extraterritorial | 2019 |
| Quinspiration Limited | Wholesale & retail | 2023 |
| Quintessential Properties Ltd | Real estate | 2016 |
| Quintet Pictures Ltd | Information & communication | 2020 |
| Quire Auctions Limited | Wholesale & retail | 2025 |
| Quirky Stays Limited | Hospitality | 2020 |
| Quisitive Insights Limited | Professional & scientific | 2018 |
| Quiver Management Consulting Limited | Professional & scientific | 2023 |
| Quotidien Ltd | Information & communication | 2026 |
| R & G Accident Repairs Ltd | Wholesale & retail | 2024 |
| R & J Electrical Contractors (Cheltenham) Ltd | Construction | 2009 |
| R & J Grab Hire Britton Ferry Limited | Construction | 2023 |
| R & M Construction, Renovation and Maintenance Ltd | Construction | 2015 |
| R & M Plumbing and Heating Limited | Construction | 2015 |
| R & P Villas Limited | Hospitality | 1988 |
| R & P Whiskard Limited | Real estate | 2006 |