| Planting Strategies Ltd | Administrative & support | 2020 |
| Plantology on the Lane Limited | Wholesale & retail | 2024 |
| Plasma Consulting Ltd | Professional & scientific | 2024 |
| Plasmatize Media Limited | Information & communication | 2010 |
| Plaster and Rendering Solutions Limited | Construction | 2014 |
| Plastering Design Ltd | Construction | 2021 |
| Plastic Fabrication Specialists Ltd | Extraterritorial | 2021 |
| Plastic Supplies Ltd | Extraterritorial | 2020 |
| Plastics Audit & Reporting Ltd | Professional & scientific | 2024 |
| Plastics Engineering Ltd | Professional & scientific | 2023 |
| Plastiglazebuilders Ltd | Manufacturing | 2025 |
| Plastiques Art Limited | Arts & recreation | 2015 |
| Platform 5 Publishing Limited | Wholesale & retail | 1983 |
| Platinum Digital Consultancy Limited | Professional & scientific | 2023 |
| Platinum Fitness & Therapy Centre Limited | Arts & recreation | 2017 |
| Platinum Maintenance and Construction Limited | Construction | 2023 |
| Platinum Property Investments Limited | Real estate | 2025 |
| Platinum Property Letting Agents Ltd | Extraterritorial | 2014 |
| Platinum Property Services (Sussex) Limited | Other services | 2018 |
| Platinum Roofing and Maintenance Limited | Construction | 2023 |
| Platinum Traders Ltd | Wholesale & retail | 2019 |
| Platts & Nisbett Limited | Manufacturing | 1977 |
| Platts Inn Ltd | Hospitality | 2022 |
| Play by Play Limited | Information & communication | 2021 |
| Play in Ltd | Health & social care | 2014 |
| Play IT Forward Consulting Ltd | Professional & scientific | 2021 |
| Play Live Golf Limited | Extraterritorial | 2019 |
| Play to Measure Ltd | Manufacturing | 2023 |
| Play With Learning Limited | Manufacturing | 2010 |
| Playgarden Design & Resources Ltd | Manufacturing | 2009 |
| PLAYGROUNDS4U Ltd | Wholesale & retail | 2018 |
| Playlobly Ltd | Information & communication | 2026 |
| Playwerks Limited | Information & communication | 2017 |
| Pleasant Retreat Limited | Hospitality | 2025 |
| Please Don'T Limited | Information & communication | 2026 |
| Pleasure Bunch Records Limited | Wholesale & retail | 2019 |
| Pleiades Computer Systems Limited | Information & communication | 1996 |
| Plewsy Creative Limited | Professional & scientific | 2011 |
| Plexus Group Limited | Administrative & support | 2010 |
| Pliassova Subtitling Services Limited | Professional & scientific | 2018 |
| PLM Autocentre Limited | Wholesale & retail | 2010 |
| PLM Gymnastics Limited | Arts & recreation | 2016 |
| PLM Spedition Ltd | Transport & logistics | 2019 |
| Plot 7 East Markham Vale Management Company Limited | Real estate | 2012 |
| PLP Global Technology Group Ltd | Information & communication | 2025 |
| PLP Lift Trucks (Holdings) Limited | Financial services | 2017 |
| PLP Technical(Uk) Ltd | Energy | 2017 |
| Plum PIE Media Limited | Information & communication | 2010 |
| Plum Tree Estates Ltd | Construction | 2010 |
| Plum-Alti Limited | Manufacturing | 2006 |
| Plumbeam Ltd | Hospitality | 2021 |
| Plumbenergy Ltd | Construction | 2022 |
| Plumbenergy Remedial Ltd | Construction | 2026 |
| Plumbernow Ltd | Construction | 2023 |
| Plumbeze UK Limited | Construction | 2009 |
| Plumbhaste Heating and Mechanical Services Limited | Construction | 2012 |
| Plumbhaste Plumbing & GAS Services Ltd | Construction | 2024 |
| Plumbing Network Yorkshire Limited | Construction | 2022 |
| Plumbing Supplies Company (Rotherham) Limited | Wholesale & retail | 2007 |
| Plumbit - Plumbing & Drainage Ltd | Construction | 2024 |
| Plumbley 1958 Limited | Extraterritorial | 2014 |
| Plumbtree Consulting Limited | Professional & scientific | 2011 |
| Plus Trading Limited | Wholesale & retail | 2014 |
| PLUS5SOLUTIONS Ltd | Information & communication | 2025 |
| PLUS84 Ltd | Hospitality | 2025 |
| PLUS84CSC Ltd | Hospitality | 2025 |
| PLUS84MANCHESTER Ltd | Hospitality | 2025 |
| Plush Family Health Solutions Limited | Health & social care | 2026 |
| Plush Holdings Limited | Real estate | 2025 |
| Plusmodesty Ltd | Wholesale & retail | 2025 |
| Plusnet PLC | Information & communication | 1996 |
| Plustech Ltd | Information & communication | 2019 |
| Plustradespeople Limited | Professional & scientific | 2024 |
| Plutec Ltd | Information & communication | 2025 |
| Plutos Structural Engineering Consultants Ltd | Professional & scientific | 2019 |
| Plutus Horizons Ltd | Professional & scientific | 2024 |
| Plutus Horizons Property Ltd | Real estate | 2025 |
| Plymonc Limited | Health & social care | 2018 |
| Plymouth Vascular Clinic Limited | Health & social care | 2019 |
| PM 360 Ltd | Construction | 2018 |
| PM Accounting Limited | Professional & scientific | 2024 |
| PM Equestrian Ltd | Wholesale & retail | 2012 |
| PM Property Ventures Limited | Real estate | 2023 |
| PMC Aesthetic Dentistry Limited | Health & social care | 2023 |
| Pmcardio Ltd | Health & social care | 2023 |
| Pmcl (UK) Limited | Wholesale & retail | 2006 |
| Pmcz Motors Ltd | Wholesale & retail | 2026 |
| PMD Electrical Contractors Limited | Construction | 2009 |
| PML Business Services Ltd | Administrative & support | 2013 |
| PML Plating Ltd | Manufacturing | 2009 |
| PMM Landscapes Limited | Administrative & support | 2019 |
| Pmmgmt Limited | Arts & recreation | 2023 |
| PMP Creative Ltd | Professional & scientific | 2025 |
| Pmqf Ltd | Information & communication | 2023 |
| PMR & Sons Limited | Wholesale & retail | 2024 |
| PN Wastewater Compliance Services Ltd | Professional & scientific | 2026 |
| Pnaql Ltd | Professional & scientific | 2023 |
| PNC South Yorkshire Ltd | Construction | 2016 |
| Pneumatic & Hydraulic Couplings Limited | Wholesale & retail | 1993 |
| Pneumatic Components Limited | Manufacturing | 1938 |