| Purposeful Holdings Limited | Financial services | 2021 |
| Purposeful Investments Limited | Real estate | 2021 |
| Purrfectly Pawsitive Ltd | Other services | 2024 |
| Push Investments Ltd | Real estate | 2023 |
| Pusulait Ltd | Information & communication | 2019 |
| Putson Engineering Services Limited | Construction | 2015 |
| Puzzle Piece Law Ltd | Professional & scientific | 2020 |
| PV 2050 Ltd | Construction | 2022 |
| PV Solar Consultancy Ltd | Construction | 2025 |
| PW & OW Holdings Limited | Professional & scientific | 2006 |
| PW Creative Limited | Professional & scientific | 2016 |
| PW Fine Art Limited | Administrative & support | 2018 |
| PW Fine Foods Limited | Wholesale & retail | 2018 |
| PW Surveyor London Limited | Administrative & support | 2025 |
| PW Transport & Recovery Ltd | Transport & logistics | 2015 |
| PWC Consolidated Ltd | Real estate | 2024 |
| PWP Construction Ltd | Construction | 2020 |
| PWP Group Ltd | Construction | 2015 |
| Pwrd Limited | Manufacturing | 2024 |
| Pyments Alcester Limited | Construction | 2011 |
| Pyms Stables Management Company Limited | Households | 2008 |
| Pyramid Ledger Ltd | Information & communication | 2019 |
| Pyrotek Engineering Materials Limited | Manufacturing | 1932 |
| PZT Limited | Construction | 2025 |
| Q & Q Islandner Limited | Professional & scientific | 2025 |
| Q Executive Ltd | Transport & logistics | 2025 |
| Q Fincap Limited | Professional & scientific | 2020 |
| Q Technologies Limited | Manufacturing | 2002 |
| Q&L Maintenance Ltd | Construction | 2023 |
| Q&S Solution MK Limited | Administrative & support | 2026 |
| Q-Matic (U.K.) Limited | Administrative & support | 1987 |
| Q8I Ltd | Wholesale & retail | 2023 |
| Q:Alliance | Other services | 1998 |
| QA Testing Network Ltd | Professional & scientific | 2019 |
| Qadeer Hussian Profectiion Ltd. | Wholesale & retail | 2024 |
| Qahwa & Date Limited | Wholesale & retail | 2025 |
| Qamantra Limited | Information & communication | 2021 |
| Qapro Consulting Limited | Information & communication | 2004 |
| Qatras Mall Limited | Wholesale & retail | 2025 |
| Qatras Travel Limited | Administrative & support | 2025 |
| Qbase Ltd | Information & communication | 2026 |
| QC Flooring Limited | Wholesale & retail | 2009 |
| Qcall Limited | Extraterritorial | 2018 |
| QCL Associates LLP | | 2016 |
| QCR Holdings Limited | Financial services | 2023 |
| Qcrs Group Limited | Professional & scientific | 2020 |
| QDL Solutions Limited | Information & communication | 2021 |
| Qeels Limited | Wholesale & retail | 2023 |
| QF Connect Ltd | Health & social care | 2024 |
| QGC Consulting Ltd | Wholesale & retail | 2018 |
| QH Property Ventures Ltd | Real estate | 2025 |
| QH Real Estate Ventures Limited | Real estate | 2025 |
| QI Care Support Services Ltd | Health & social care | 2015 |
| QI YOU Huang Ltd. | Wholesale & retail | 2025 |
| Qick Technologies Limited | Information & communication | 2023 |
| Qinghong Business Consultation Limited | Administrative & support | 2025 |
| QJB Limited | Construction | 2020 |
| QK Textile and Home Products Global Ltd | Wholesale & retail | 2018 |
| QKJ LI Ltd. | Wholesale & retail | 2025 |
| QM Limited | Professional & scientific | 2004 |
| QM Removals Ltd | Transport & logistics | 2020 |
| Qmatic (United Kingdom) Limited | Administrative & support | 2000 |
| Qp&T Services Ltd | Transport & logistics | 2011 |
| QQS Home Limited | Real estate | 2022 |
| QR Cook Ltd | Hospitality | 2024 |
| QRB Management Consultants Limited | Professional & scientific | 2016 |
| QS Management Services Ltd | Construction | 2017 |
| QSA Care Limited | Health & social care | 2020 |
| Qshore Systems Ltd | Information & communication | 2026 |
| Quackers Childminding Ltd | Other services | 2012 |
| Quadda Limited | Information & communication | 2025 |
| Quadstakes Ltd | Professional & scientific | 2023 |
| Quail Publishing Limited | Information & communication | 2015 |
| Qualita'Tiff Ltd | Other services | 2018 |
| Qualitas Virtus Consult Ltd | Professional & scientific | 2009 |
| Quality Coding & Information Recruitment Solutions Limited | Administrative & support | 2014 |
| Quality Destinations Ltd | Hospitality | 2011 |
| Quality Diamonds Limited | Wholesale & retail | 2006 |
| Quality Iconstruction Ltd | Construction | 2013 |
| Quality Impressions Homecare Company Ltd | Households | 2021 |
| Quality Life Matters Care Services Ltd | Health & social care | 2021 |
| Quality Roofing and Leadworks Ltd | Construction | 2022 |
| Quality Solutions (MK) Limited | Professional & scientific | 2006 |
| Quality Testing Solutions Ltd | Wholesale & retail | 1997 |
| Quality Ventilation Systems (UK) Ltd | Construction | 2012 |
| Qualityify Limited | Information & communication | 2020 |
| QUALITYLEADS24 Ltd | Other services | 2024 |
| Qualiv Ltd | Wholesale & retail | 2025 |
| Qualware Ltd | Information & communication | 2026 |
| Qualyval Ltd | Information & communication | 2020 |
| Quang HAI Ltd | Other services | 2023 |
| Quant Foundry Limited | Information & communication | 2018 |
| Quantifai Ltd | Information & communication | 2019 |
| Quantig Ltd | Professional & scientific | 2002 |
| Quantori UK Limited | Information & communication | 2021 |
| Quantum Accounting Services Limited | Professional & scientific | 2009 |
| Quantum Cubed Energy Ltd | Wholesale & retail | 2016 |
| Quantum Digital Technology Limited | Information & communication | 2021 |
| Quantum Drylining Ltd | Construction | 2024 |
| Quantum Generate Ltd | Information & communication | 2023 |