| PSR Control Systems Limited | Manufacturing | 2003 |
| PSV Transport Ltd | Transport & logistics | 2019 |
| PSY Delivery Ltd | Transport & logistics | 2025 |
| Psychological Consulting Ltd | Health & social care | 2019 |
| Psychonaut Express Ltd | Transport & logistics | 2025 |
| Psychwork Solutions Limited | Administrative & support | 2003 |
| PT Golf Limited | Wholesale & retail | 2016 |
| PT Homes & Lettings Co. Limited | Real estate | 2026 |
| PT Pilates (Monmouth) Limited | Arts & recreation | 2025 |
| PT Pilates Limited | Arts & recreation | 2020 |
| PTM Business Solutions Ltd | Extraterritorial | 2023 |
| PTP London Limited | Arts & recreation | 2023 |
| PTP1982 Ltd. | Other services | 2015 |
| PUB O'Clock Ltd | Hospitality | 2018 |
| Publicans Estate Limited | Hospitality | 2019 |
| Pullen Holdings Ltd | Real estate | 2024 |
| Pullman Gallery Limited | Wholesale & retail | 1998 |
| Pulse Knit Limited | Wholesale & retail | 2025 |
| Pulse Professional Software Ltd | Information & communication | 2012 |
| Pulse Tech Consultancy Limited | Information & communication | 2024 |
| Pulsebyte Ltd | Information & communication | 2025 |
| Pump IT UP With MEG Limited | Arts & recreation | 2025 |
| Pumpdrive Ltd | Professional & scientific | 2025 |
| Punjab Transport Services Ltd | Transport & logistics | 2021 |
| Pupur Limited | Real estate | 2021 |
| Pure Green Electrical Limited | Construction | 2024 |
| Pure Green Safety Solutions Limited | Professional & scientific | 2025 |
| Pure Group (South Wales) Ltd | Financial services | 2020 |
| Pure Image Group Limited | Administrative & support | 2020 |
| Pure Luxe Ltd | Administrative & support | 2026 |
| Pure Pets Newport Limited | Wholesale & retail | 2021 |
| Pure Properties (South Wales) Ltd | Real estate | 2021 |
| Pure Sport & Leisure Limited | Wholesale & retail | 2011 |
| Pure Taxis Ltd | Transport & logistics | 2024 |
| Pure Vans Limited | Wholesale & retail | 2009 |
| Pureclean Commercial Services Ltd | Administrative & support | 2023 |
| Purple Cleaning and Property Services Ltd | Administrative & support | 2019 |
| Purple Pendulum Ltd | Financial services | 2025 |
| Purple Premier Properties Limited | Real estate | 2016 |
| Purple Prince Media Ltd | Information & communication | 2017 |
| Purplelife Limited | Professional & scientific | 2016 |
| Purpose Property Ltd | Real estate | 2015 |
| Pushbar Limited | Information & communication | 2021 |
| PV247 AI Ltd | Information & communication | 2026 |
| PVM Mobility Ltd | Extraterritorial | 2023 |
| PW Trade Sales Ltd | Wholesale & retail | 2018 |
| PWC Tiling Limited | Construction | 2023 |
| Pwidf Ltd | Construction | 2000 |
| PXL Ice Limited | Information & communication | 2020 |
| PXL Realm Limited | Professional & scientific | 2018 |
| PYG Rural Limited | Real estate | 2025 |
| Pyka Limited | Education | 2016 |
| Pylon Limited | Information & communication | 2012 |
| Pyramid HR Ltd | Administrative & support | 2021 |
| Pyros Management Ltd | Professional & scientific | 2024 |
| Python IT Limited | Information & communication | 2015 |
| Q Studio Hair Salons Limited | Other services | 2001 |
| Q Tech Marketing Solutions Ltd | Wholesale & retail | 2024 |
| Q2DB Limited | Real estate | 1998 |
| Q45 Events Ltd | Arts & recreation | 2025 |
| Q7DB Limited | Real estate | 2004 |
| QA Tech Ltd | Professional & scientific | 2022 |
| QA Test Professionals Ltd | Information & communication | 2017 |
| QA360 Ltd | Information & communication | 2011 |
| Qamar ALI Ltd | Wholesale & retail | 2025 |
| Qazi Motors Limited | Wholesale & retail | 2015 |
| QBS Building Services Limited | Construction | 2017 |
| QE Diagnostics Ltd | Manufacturing | 2023 |
| QED Residential (IW) Ltd | Construction | 2019 |
| Qhse Management System Services Limited | Professional & scientific | 2023 |
| Qrky Beauty Ltd | Other services | 2021 |
| QSE Solutions Limited | Professional & scientific | 2014 |
| QTV Logistics Ltd | Transport & logistics | 2026 |
| Quaff Drinks Ltd | Wholesale & retail | 2019 |
| Qualified Legal Solicitors Ltd | Professional & scientific | 2013 |
| Quality Finances Limited | Financial services | 2019 |
| Quantum Business Consultancy Limited | Professional & scientific | 2002 |
| Quantum Traffic Management Limited | Construction | 2015 |
| Quarry Planning Ltd. | Professional & scientific | 1996 |
| Quarter Jack Park (Wimborne) Management Company Limited | Households | 2019 |
| Quay Arts Trading Company Limited | Wholesale & retail | 1997 |
| Quboc Ltd | Information & communication | 2021 |
| Qubocventures Ltd | Real estate | 2024 |
| Queens Newport Ltd | Other services | 2024 |
| Queer & NOW CIC | Arts & recreation | 2023 |
| Quest Removals Limited | Transport & logistics | 2026 |
| Questa Psychological Services Ltd | Health & social care | 2020 |
| Quick Call Transport Service Ltd | Transport & logistics | 2025 |
| Quick Cleaning Ltd | Administrative & support | 2021 |
| Quick Consult Ltd | Health & social care | 2024 |
| Quick FIX Property Maintenance(Wales) Ltd | Construction | 2025 |
| Quick FIX Supplies Ltd | Administrative & support | 2017 |
| Quin & Co Limited | Construction | 2010 |
| Quine Technology Ltd | Information & communication | 2021 |
| Quintis Limited | Information & communication | 2020 |
| Quirky Kitchens & Surfaces Limited | Wholesale & retail | 2023 |
| Quote Mech Elec Ltd | Administrative & support | 2024 |
| Q’S Local Ltd | Wholesale & retail | 2025 |
| R & H Pawley Limited | Professional & scientific | 2011 |
| R & L Management Ltd | Real estate | 2014 |