| Phoenix Timber (Stoke-On-Trent) Limited | Manufacturing | 1958 |
| Phpm Ltd | Construction | 2018 |
| PIC Preview Limited | Professional & scientific | 2024 |
| Pick & Click Ltd | Wholesale & retail | 2025 |
| Pickwicks Essex Ltd | Hospitality | 2024 |
| Pics KMR Ltd | Wholesale & retail | 2021 |
| Picu Projects Ltd | Construction | 2022 |
| Piece of Cake Casting Limited | Administrative & support | 2015 |
| Pier Arches Cafe Ltd | Administrative & support | 2016 |
| Pier Metals Limited | Administrative & support | 2010 |
| Pigeons Direct Limited | Wholesale & retail | 2023 |
| Pilgrims Close Management Company Limited | Real estate | 2004 |
| Pilla Limited | Information & communication | 2007 |
| Pillar Productions Limited | Information & communication | 2011 |
| Pimco (UK) Limited | Real estate | 2003 |
| Pinfarthings Blinds & Awnings Limited | Wholesale & retail | 2002 |
| Pingpoint Technologies Ltd | Information & communication | 2025 |
| Pink House on the Hill Limited | Wholesale & retail | 2021 |
| Pink Tree Media Ltd | Information & communication | 2014 |
| Pink Wafer Limited | Administrative & support | 2004 |
| Pioneer Times Limited | Other services | 2004 |
| Pipe 'N' Plumb Limited | Construction | 2007 |
| Pipers Court Worlingworth Management Company Ltd | Real estate | 2025 |
| Piscero Co Ltd | Wholesale & retail | 2024 |
| Pisces Fish Bar and Restaurant Limited | Hospitality | 2003 |
| Pishon Ltd | Professional & scientific | 2007 |
| Pit-Stop Mobile Valeting Services Ltd | Wholesale & retail | 2004 |
| Pixelvault Ltd | Information & communication | 2025 |
| Piñata Ltd | Information & communication | 2022 |
| PJD Asset Management Limited | Real estate | 2018 |
| PJF Interiors Limited | Construction | 2004 |
| PJH Consultants Ltd | Professional & scientific | 2005 |
| PJH Creative Limited | Professional & scientific | 2010 |
| PJM Lift Services Limited | Manufacturing | 2000 |
| PJR Communications Ltd. | Administrative & support | 2002 |
| PJR Investments Limited | Financial services | 2006 |
| PJS Global Limited | Real estate | 2004 |
| PK Retail Management Limited | Wholesale & retail | 2025 |
| PKC Associates Limited | Financial services | 1991 |
| PKH Educare Training Services Ltd | Education | 2022 |
| PKL Drylining Limited | Construction | 2005 |
| Pkpd Consulting Limited | Professional & scientific | 2006 |
| PKS Taxis Limited | Transport & logistics | 2026 |
| Planet Dynamic Limited | Extraterritorial | 2002 |
| Planet Earth Publicity Limited | Administrative & support | 2003 |
| Planshore Limited | Health & social care | 1988 |
| Plant BE Limited | Wholesale & retail | 2018 |
| Planwise Data Limited | | 1982 |
| Plastic Extruders Limited | Manufacturing | 1962 |
| Platinum Hot Tubs Services UK Ltd | Arts & recreation | 2022 |
| Plawasha Trades Ltd | Wholesale & retail | 2026 |
| Play-To-Learn Limited | Education | 1998 |
| Playground at Theydon Association | Other services | 2017 |
| Playmat Limited | Hospitality | 2017 |
| Plazatree Limited | | 1982 |
| Pleass Thomson & Company Limited | Professional & scientific | 2003 |
| Plegit Limited | Information & communication | 2022 |
| Plemont Medical Limited | Health & social care | 2023 |
| Plemora Ltd | Wholesale & retail | 2025 |
| Plessey Consumer Products Limited | Professional & scientific | 1915 |
| Plessey Telecommunications Systems Limited | | 1950 |
| PLT Academy Ltd | Education | 2009 |
| Plugnet Ltd | Energy | 2024 |
| Plumbtec Plumbing & Heating Limited | Construction | 2007 |
| Plus NOT Minus Ltd | Education | 2025 |
| Plusenigma Limited | Construction | 1999 |
| PM London Group Ltd | Real estate | 2017 |
| PMR Solutions Limited | Professional & scientific | 2004 |
| Pmsi Newco Limited | Administrative & support | 2025 |
| Pmsl Hub Ltd | Information & communication | 2025 |
| PMW Developments Ltd | Construction | 2005 |
| PNM Group Ltd | Administrative & support | 2025 |
| PNP Consultants (UK) Limited | Professional & scientific | 1994 |
| Poachkarn Limited | Wholesale & retail | 1978 |
| Podgy Dwarf Productions Ltd | Manufacturing | 2017 |
| Point of Sale Centre Limited(The) | Wholesale & retail | 1968 |
| Pole Position Scaffolding Limited | Construction | 1996 |
| Policy Excess Insure Ltd | Financial services | 2017 |
| Polla Enterprises Ltd | Wholesale & retail | 2026 |
| Polston Services Limited | Construction | 2006 |
| Pomegranate Park Management Company Limited | Households | 2016 |
| Pope & Smith (Chelmsford) Limited | Wholesale & retail | 1999 |
| Poppy Insulations Ltd | Construction | 2026 |
| Poprey UK Limited | Wholesale & retail | 2024 |
| Popular Hire Services Limited | Administrative & support | 1977 |
| Popup Procurement Limited | Information & communication | 2022 |
| Port of London Tilbury Limited | Professional & scientific | 1993 |
| Porter Tennis Limited | Arts & recreation | 2020 |
| Porterman Investments Limited | Real estate | 1986 |
| Porterman Services Limited | Wholesale & retail | 1985 |
| Portminster Properties Limited | Real estate | 1998 |
| Portrait of Africa Limited | Information & communication | 2000 |
| Posh Plumbers Limited | Construction | 2024 |
| Positive Media Marketing Limited | Professional & scientific | 1995 |
| Post Centre Ltd | Transport & logistics | 2013 |
| Posture Health Ltd | Wholesale & retail | 2025 |
| Postway Estates LLP | | 2023 |
| Potato Call Limited | Administrative & support | 1992 |
| Poulton Decor Limited | Construction | 2004 |
| Powell Design & Technology Limited | Real estate | 2013 |