| Patpietrysiak Ltd | Health & social care | 2021 |
| Patricia Cimpean Procare Ltd | Health & social care | 2020 |
| Paul Barrow Builders Ltd | Construction | 2011 |
| Paul Braybrooke Limited | Other services | 2003 |
| Paul Evans Architects Limited | Professional & scientific | 2019 |
| Paul Nobbs Motorcycles Limited | Wholesale & retail | 2012 |
| Paws Doggy Day Care Limited | Other services | 2015 |
| Paxmata Ltd | Information & communication | 2024 |
| PB & Co Enterprises Ltd | Wholesale & retail | 2024 |
| PB Water Training and Consultancy Ltd | Professional & scientific | 2025 |
| PCG Accountants Limited | Professional & scientific | 2004 |
| PCP Scaffold Consultancy Limited | Extraterritorial | 2023 |
| PD Build Ltd | Construction | 2014 |
| Peach CG Ltd. | Wholesale & retail | 2025 |
| Peacock & Houghton Brickwork Ltd | Construction | 2023 |
| Peak Equine Diagnostic Imaging Ltd | Professional & scientific | 2024 |
| Pearson & Sons Holdings Limited | Households | 2025 |
| Pebbol Ltd | Information & communication | 2011 |
| Peberdy Degg Limited | Wholesale & retail | 2013 |
| Pegasus Elliot Mackenzie Publishers Limited | Information & communication | 2001 |
| Pellivision Ltd | Information & communication | 2025 |
| Peloton Power Limited | Construction | 2023 |
| Pencilfish Limited | Professional & scientific | 2002 |
| Penguin Motors Ltd | Wholesale & retail | 2013 |
| Perfect Places (UK) Ltd | Hospitality | 2012 |
| Performance Packaging (UK) Limited | Manufacturing | 1997 |
| Perry Automotive Limited | Wholesale & retail | 2025 |
| Peter Scott Services Ltd | Professional & scientific | 2023 |
| Peter Trushell Building Services Ltd | Construction | 2025 |
| Peterson Retail Limited | Wholesale & retail | 2023 |
| PH Wellbeing Ltd | Arts & recreation | 2025 |
| Pharmatechnics Limited | Professional & scientific | 2003 |
| Phillips Carpentry and Construction Limited | Construction | 2025 |
| Phoenix Health Providers Limited | Health & social care | 2023 |
| Physio and Sports Therapy Limited | Health & social care | 2015 |
| Physio Pulse Ltd | Health & social care | 2025 |
| Pi-Tech Systems Limited | Wholesale & retail | 2009 |
| Picklock Media Limited | Information & communication | 2009 |
| Pickup Truck Racing Limited | Arts & recreation | 2002 |
| Piecemaker Gear UK Limited | Wholesale & retail | 2025 |
| PIG Farm Records Limited | Extraterritorial | 2007 |
| Pinot Limited | Hospitality | 2025 |
| Pioneer Education Group Ltd | Education | 2023 |
| Pioneer Landscapes Ltd | Administrative & support | 2021 |
| Pioneer Petfood Ltd | Wholesale & retail | 2013 |
| Pioneer Qualifications Limited | Education | 2023 |
| PJ Cooling and Refrigeration Ltd | Construction | 2026 |
| Pjjb Holdings Limited | Administrative & support | 2024 |
| PJP Cambridge Limited | Administrative & support | 2011 |
| Plan-Tech Property Solutions Limited | Professional & scientific | 2010 |
| Planetari Ltd | Education | 2018 |
| Plant Solutions Limited | Extraterritorial | 2003 |
| Plasflow Limited | Manufacturing | 2000 |
| Platform First Limited | Professional & scientific | 2018 |
| PLATFORM-4 Systems Limited | Administrative & support | 2012 |
| Platinum Mobility Ltd | Wholesale & retail | 2022 |
| Platinum Vehicles Ltd | Wholesale & retail | 2025 |
| Players Van Works Limited | Wholesale & retail | 2022 |
| Playsteds Lane Property RTM Company Limited | Real estate | 2008 |
| Plaza Business Services Ltd | Construction | 2020 |
| Plotify Limited | Information & communication | 2020 |
| PMH Brickwork Limited | Construction | 2018 |
| Pobblebead Software Limited | Information & communication | 2012 |
| Pocock & Shaw ELY Limited | Real estate | 2006 |
| POINT5IVE Ltd | Wholesale & retail | 2025 |
| Polar Trading Company Limited | Wholesale & retail | 2026 |
| Polaris Networks Limited | Information & communication | 2011 |
| Pole Sense Ltd | Manufacturing | 2026 |
| Pole Shed Events & Merchandise Ltd | Wholesale & retail | 2022 |
| Polfarma Ltd | Wholesale & retail | 2015 |
| Polish & Pedal Autos Limited | Administrative & support | 2025 |
| Poltrader Limited | Wholesale & retail | 2007 |
| Polyglaze Ltd | Construction | 2017 |
| Polygon Treehouse Ltd | Information & communication | 2017 |
| Pond Farm (Mepal) Management Company Ltd | Real estate | 2020 |
| Port Plumbing Ltd | Construction | 2007 |
| Portley Garage (Littleport) Limited | Wholesale & retail | 2007 |
| Powder Digital Limited | Information & communication | 2013 |
| Powertrain Systems Ltd | Professional & scientific | 2006 |
| PPM Group Limited | Administrative & support | 2009 |
| Precision Agronomy Ltd | Agriculture & fishing | 2010 |
| Precision Associates Limited | Manufacturing | 1996 |
| Precision Door Solutions Limited | Wholesale & retail | 2020 |
| Precision Painting and Decorating Ltd | Construction | 2016 |
| Preferred Project Managers Limited | Professional & scientific | 2000 |
| Premier Boxes Limited | Wholesale & retail | 2005 |
| Premier Brickwork Limited | Construction | 2007 |
| Premium Motors Direct Limited | Wholesale & retail | 2025 |
| Present Help Care Ltd | Health & social care | 2024 |
| Presto Audio Visual Limited | Information & communication | 2009 |
| Pretoria Water Company Limited | Extraterritorial | 2003 |
| Pretty Perfect Cleaning Services Ltd | Administrative & support | 2025 |
| Pretty Sarees Ltd | Wholesale & retail | 2024 |
| Prickwillow Village CIC | Other services | 2023 |
| Priestwood Consulting Ltd | Professional & scientific | 2025 |
| Primary Products Limited | Wholesale & retail | 2014 |
| Primavera (Cambridge) Limited | Wholesale & retail | 1958 |
| Primavera UK Limited | Wholesale & retail | 1999 |
| Prime Decorating & Flooring Ltd | Construction | 2025 |
| Principal Escape Rooms Ltd | Arts & recreation | 2026 |