| Profusion Recruitment Limited | Administrative & support | 2024 |
| Progeny 2023 Limited | Construction | 2023 |
| Progeny Security Limited | Financial services | 2021 |
| Progress Plumbing Heating and Electrical Services Limited | Construction | 2009 |
| Progression Recruitment Group Ltd | Administrative & support | 2020 |
| Progressive Auto Services Ltd | Wholesale & retail | 2023 |
| Proguard Central Services Limited | Other services | 1999 |
| Project Farm 1 Holdco Ltd | Financial services | 2025 |
| Project Farm 1 Issuer PLC | Financial services | 2025 |
| Project Kestrel Bidco Limited | Administrative & support | 2019 |
| Project Managed Building Services Limited | Construction | 2004 |
| Project Runner Limited | Public administration | 2012 |
| PROJECT2DESIGN Ltd | Professional & scientific | 2024 |
| Project: Athletic Ltd | Arts & recreation | 2022 |
| Projects Southern Contracts Limited | Manufacturing | 2021 |
| Projects Southern Limited | Manufacturing | 2012 |
| Proline Finish Solutions Limited | Construction | 2026 |
| Promoting Independence in People Ltd | Other services | 2006 |
| Pronest Properties Limited | Real estate | 2024 |
| Prop 8 Ltd | Professional & scientific | 2023 |
| Property Link Investment Ltd | Real estate | 2026 |
| Property NRG Limited | Real estate | 2020 |
| Property Prince Limited | Real estate | 2017 |
| Propertyplus Holdings Ltd | Real estate | 2019 |
| Prosco Properties Ltd | Real estate | 2025 |
| Proserv Recruitment Ltd | Administrative & support | 2010 |
| Prospect Letting Agency Limited | Real estate | 2004 |
| Prosperity Independent Financial Advisors & Stockbrokers Limited | Administrative & support | 2009 |
| Prosser Associates Limited | Administrative & support | 2006 |
| Protea Gardens Management Limited | Real estate | 1999 |
| Protec Installations (Southern) Limited | Administrative & support | 2012 |
| Protec Roofing South Ltd | Construction | 2025 |
| Protech Industries Ltd | Administrative & support | 2009 |
| Protection Medics International Ltd | Health & social care | 2024 |
| Protek Systems Ltd | Administrative & support | 1997 |
| Proteus Change Management Ltd | Professional & scientific | 2023 |
| Provulo Limited | Administrative & support | 2019 |
| Proxy Consulting Limited | Administrative & support | 2023 |
| Pryzm Developments Limited | Construction | 2018 |
| PSC Management Services Limited | Administrative & support | 2016 |
| Pshk Investments Limited | Administrative & support | 2018 |
| PSL Shopfitting Limited | Construction | 2012 |
| PSP Worldwide Logistics Limited | Transport & logistics | 1998 |
| Psychedelia Limited | Arts & recreation | 2011 |
| PTK Care Consultancy Limited | Health & social care | 2022 |
| PTS (Private Hire) Limited | Transport & logistics | 2025 |
| PUB Destination Ltd | Hospitality | 2018 |
| Puddleduck Nursery (Oxfordshire) Limited | Health & social care | 1999 |
| Pudsey Specsavers Limited | Wholesale & retail | 2007 |
| Pudsey Visionplus Limited | Wholesale & retail | 2007 |
| Puff OFF Ltd | Wholesale & retail | 2025 |
| Puffdawg Limited | Wholesale & retail | 2025 |
| Pulse Accountancy Ltd | Professional & scientific | 2022 |
| Puma Engineering & Construction Limited | Manufacturing | 2000 |
| Pure Drop Solutions Ltd | Administrative & support | 2022 |
| Pure Selection Limited | Administrative & support | 2021 |
| Purestone Construction Limited | Construction | 2025 |
| Purewater Plumbing and Heating Ltd | Construction | 2026 |
| Puri O'Clock Limited | Hospitality | 2026 |
| Purley Specsavers Limited | Wholesale & retail | 2017 |
| Purple Corsair Ltd | Wholesale & retail | 2023 |
| Purple Emerald Property Experts Ltd | Real estate | 2025 |
| Purple Physio Limited | Health & social care | 1998 |
| Purple Tree Travel Ltd. | Administrative & support | 2017 |
| Purple Turtle Diving Limited | Other services | 2011 |
| Putman Ltd | Other services | 2021 |
| Putman Properties Ltd | Real estate | 2010 |
| Putney High Specsavers Limited | Wholesale & retail | 1995 |
| Putney High Visionplus Limited | Wholesale & retail | 1995 |
| PWR Leadership & Logistics Ltd | Professional & scientific | 2023 |
| Pycom Ltd | Information & communication | 2015 |
| Pytysol Ltd | Wholesale & retail | 2019 |
| Q Fitness Ltd | Arts & recreation | 2025 |
| QA Logistics Ltd | Administrative & support | 2021 |
| QBI Consumables Ltd | Manufacturing | 2006 |
| QCA Quality Covers ALL Limited | Manufacturing | 2015 |
| QH Salisbury Investments Ltd | Professional & scientific | 2014 |
| QRA Compliance Limited | Administrative & support | 2013 |
| Qryoo Limited | Information & communication | 2022 |
| Quad 9 Elms UK Limited | Real estate | 2025 |
| Quadramedia Limited | Professional & scientific | 1997 |
| Quadrant Plumbing Solutions Ltd | Construction | 2026 |
| Qualitas Services Ltd | Other services | 2005 |
| Quality First TH Ltd | Real estate | 2022 |
| Quality Packaging Services Limited | Manufacturing | 2014 |
| Quality Spray Services Ltd | Manufacturing | 2016 |
| Quantec Hvac Solutions Ltd | Administrative & support | 2020 |
| Quantia Ltd | Information & communication | 2025 |
| Quantum Effect Limited | Professional & scientific | 2011 |
| Quantum Investments & Developments Limited | Real estate | 2017 |
| Quantum PG Limited | Information & communication | 2010 |
| Quantum Quilting Limited | Manufacturing | 2015 |
| QUANTUMP3M Ltd | Professional & scientific | 2024 |
| Quantus Limited | Wholesale & retail | 2024 |
| Quay Way Ltd | Health & social care | 2024 |
| Quay Wines Limited | Wholesale & retail | 2020 |
| Quayside Commerce Centre Limited | Professional & scientific | 1989 |
| Qubist Ltd | Real estate | 2021 |
| Queen Bean Ltd | Hospitality | 2023 |
| Queensway Specsavers Limited | Wholesale & retail | 2007 |