| Photon JWC Limited | Real estate | 2022 |
| PHP Ltd | Extraterritorial | 2009 |
| PHS UK Opco Limited | Professional & scientific | 2024 |
| Phylarchus II LLP | | 2022 |
| Phylarchus LLP | | 2020 |
| Physio in Stride Ltd | Other services | 2025 |
| Picasso Engineering Ltd | Manufacturing | 2020 |
| Pied Bull Media Ltd | Information & communication | 2019 |
| Pierce & Spectre Ltd | Wholesale & retail | 2025 |
| Pierrepont`S Cafe Ltd | Hospitality | 2009 |
| Pilgrims Lodge ST. Albans Ltd | Real estate | 2021 |
| Pine Trees Developments Ltd | Construction | 2022 |
| Pinecliffe Construction Limited | Construction | 2005 |
| Pinehire Limited | Professional & scientific | 1987 |
| Pinewood Motors Ltd | Wholesale & retail | 2024 |
| Pingala Solutions Ltd | Administrative & support | 2014 |
| Pink Poodle Events Ltd | Arts & recreation | 2006 |
| Pink Taxi Club Ltd | Transport & logistics | 2025 |
| Pioneer Approaches Ltd | Health & social care | 2013 |
| Pipeline Construction Services Ltd | Construction | 2022 |
| Pipers Press Juice Company Limited | Manufacturing | 2025 |
| Pirilini Limited | Wholesale & retail | 2025 |
| Pixelated Panties Ltd. | Information & communication | 2015 |
| Pixels & Paper Ltd | Professional & scientific | 2018 |
| Pixels Limited | Extraterritorial | 2003 |
| Pixoma Limited | Information & communication | 2008 |
| PJ Construction (London) Limited | Construction | 2019 |
| Pjetri Cafe Ltd | Hospitality | 2025 |
| Pjones Ltd | Real estate | 2023 |
| PJR Consultancy Services Ltd | Professional & scientific | 2020 |
| Pjrl Investments Ltd | Real estate | 2023 |
| PKD Mortgage Network Limited | Financial services | 2017 |
| Place Capital Partners Limited | Other services | 2017 |
| Placing Leads Limited | Information & communication | 2017 |
| Plag Limited | Financial services | 2026 |
| Plain Talking Limited | Information & communication | 1997 |
| Plan B Solutions Ltd | Professional & scientific | 2004 |
| Plan C Ltd | Real estate | 2016 |
| Planando Limited | Information & communication | 2011 |
| Planet's Friend Party Hire Ltd | Administrative & support | 2020 |
| Planners Services & Sundries Limited | Wholesale & retail | 1971 |
| Planning Sense Limited | Professional & scientific | 2014 |
| Plant and Tool Hire Ltd. | Manufacturing | 2009 |
| Planttech Ventures LLP | | 2021 |
| Platform Build Ltd | Construction | 2025 |
| Platform Sharp Ltd | Information & communication | 2024 |
| Platinum Prestige Hire Limited | Other services | 2020 |
| Play Pause Media Ltd | Information & communication | 2019 |
| Playculture Ltd | Information & communication | 2023 |
| Playground Facilities Ltd | Construction | 2005 |
| Playlounge Limited | Wholesale & retail | 2001 |
| Pleasant Point Limited | Real estate | 2010 |
| Pleon Words Ltd | Information & communication | 2019 |
| Plethora Technology Consulting Ltd | Information & communication | 2023 |
| Plexotic Ltd | Information & communication | 2017 |
| Plucky Films Ltd | Information & communication | 2021 |
| Plugg in Ltd | Information & communication | 2012 |
| Plumbers in London Ltd | Construction | 2022 |
| Plumbing, Heating & Property Services Limited | Construction | 2008 |
| Pluspad Ltd | Real estate | 2017 |
| Pluto Innovation Group Ltd | Information & communication | 2025 |
| PM Designworks Ltd | Professional & scientific | 2009 |
| Pmaj Limited | Construction | 2023 |
| PMB Consulting Limited | Professional & scientific | 2020 |
| Pmgk Consulting Limited | Information & communication | 2002 |
| Pmgk Lettings Ltd | Real estate | 2019 |
| Pneuma Data Solutions Limited | Information & communication | 2003 |
| PNR Group Ltd | Real estate | 1996 |
| Poche Properties Ltd | Households | 2022 |
| Pocket Hercules Ltd | Financial services | 2018 |
| POD Consultants Ltd | Professional & scientific | 2019 |
| Point Retail Limited | Wholesale & retail | 2025 |
| Pointview 85 Limited | Financial services | 2021 |
| Poke Nugz Ltd | Wholesale & retail | 2024 |
| Pokora Properties LLP | | 2019 |
| Polar Bear Law Limited | Professional & scientific | 2011 |
| Polar Graphics Ltd | Professional & scientific | 1999 |
| Polar Security Ltd | Administrative & support | 2020 |
| Polarpoint Services Limited | Information & communication | 1995 |
| Poles Apart Construction Ltd | Construction | 2020 |
| Ponis Ltd | Professional & scientific | 2018 |
| Popped Snacks Ltd | Wholesale & retail | 2018 |
| Poppy Parsnip Ltd | Other services | 2024 |
| Poppy Seed Publishers Limited | Information & communication | 2018 |
| Poptober Ltd | Extraterritorial | 2021 |
| Porenz Consulting Ltd | Information & communication | 2013 |
| Porter's Attar Ltd | Wholesale & retail | 2020 |
| Porters in Kensington Limited | Financial services | 1994 |
| Porters Wood Limited | Construction | 2019 |
| Portkey Partners Ltd | Professional & scientific | 2024 |
| Portland Chambers Limited | Professional & scientific | 2019 |
| Portland Plumbing Ltd | Construction | 2022 |
| Portland Property & Investments Limited | Real estate | 2025 |
| Portman Global Partners Limited | Administrative & support | 2016 |
| Porto Press Ltd | Information & communication | 2025 |
| Positive Golf Ltd | Wholesale & retail | 2023 |
| Positive Minds Alliance Limited | Other services | 2016 |
| Positive Renovations Ltd | Construction | 2009 |
| Positive Transformation Group Ltd | Other services | 2020 |
| Positive Ventilation (UK) Limited | Manufacturing | 2008 |