| Pharma Talent Taking Flight Ltd | Professional & scientific | 2025 |
| Pharmacie Cafe Ltd | Hospitality | 2021 |
| Pheasant Holdings Ltd | Real estate | 2020 |
| Philately UK Ltd | Wholesale & retail | 2026 |
| Phipps Consulting Limited | Professional & scientific | 2025 |
| PHJ Advisory Ltd | Professional & scientific | 2023 |
| PHM Holdings Ltd | Real estate | 2019 |
| Phoenix - Ministry of Fitness Ltd | Arts & recreation | 2016 |
| Phoenix Flooring Contractors (UK) Limited | Other services | 2014 |
| Phoenix New Homes Ltd | Professional & scientific | 2024 |
| Phoenix Resin Designs Ltd | Arts & recreation | 2025 |
| Physiotherapy Cambridgeshire Community Rehabilitation Ltd | Other services | 2022 |
| PI Tape Limited | Wholesale & retail | 1990 |
| Picturedrome Limited | Arts & recreation | 2018 |
| Pidley Cottom Cottages Limited | Hospitality | 2025 |
| Pig-Casso's Limited | Hospitality | 2016 |
| Pilgrim Healthcare Limited | Health & social care | 2019 |
| Pilot Medical Services Limited | Health & social care | 2011 |
| Pincheck Ltd | Professional & scientific | 2023 |
| Pineapple Loans Ltd | Financial services | 2015 |
| Pinkhouse Salon Limited | Other services | 2005 |
| Pinn Associates Limited | Professional & scientific | 2017 |
| Pinnacle Property Estates Limited | Real estate | 2016 |
| Pinoy Property Services Ltd | Real estate | 2022 |
| Pintmedia Ltd | Information & communication | 2011 |
| Piranha CNC Ltd | Professional & scientific | 2014 |
| Pishder Properties Ltd | Real estate | 2022 |
| Pitman Specialised Welding Ltd | Manufacturing | 2003 |
| PIV Services Limited | Transport & logistics | 2015 |
| Pixelcode Limited | Information & communication | 2023 |
| Pizza Town Ltd | Extraterritorial | 2016 |
| PJD Building Construction Limited | Construction | 2016 |
| Pjhfc Limited | Professional & scientific | 2018 |
| PJT Custom Build Ltd | Construction | 2015 |
| PJT Design Limited | Professional & scientific | 2007 |
| PKL Cards Ltd | Wholesale & retail | 2024 |
| Plane View Building Projects Ltd | Construction | 2018 |
| Planework Ltd. | Administrative & support | 2016 |
| Plantarif Limited | | 1988 |
| Planvin Project Consultancy Ltd | Professional & scientific | 2020 |
| Platinum Paintworks Limited | Wholesale & retail | 2014 |
| Playfords Limited | Construction | 1925 |
| Playful Paws Service Ltd | Other services | 2022 |
| Plows Partners Ltd | Professional & scientific | 2022 |
| Plugtest Electrical Ltd | Professional & scientific | 2009 |
| Plugtest Limited | Professional & scientific | 2002 |
| Plugtest Training Ltd | Extraterritorial | 2009 |
| Plugtest UK Ltd | Extraterritorial | 2009 |
| Plumbed Heating Ltd | Construction | 2023 |
| Plumtree Holdings Limited | Professional & scientific | 2014 |
| Plura Properties Limited | Real estate | 2026 |
| Plus Staff Limited | Administrative & support | 2015 |
| PMG Tech Solutions Limited | Professional & scientific | 2011 |
| PML Construction Services Ltd | Construction | 2026 |
| PMP Angels Care Limited | Health & social care | 2024 |
| Pmva Pro Training Ltd | Professional & scientific | 2023 |
| PND Trans Ltd | Transport & logistics | 2016 |
| Pocket Reality Limited | Information & communication | 2005 |
| POD Barbers Limited | Other services | 2014 |
| POG - Professionally Optimized Graphics Ltd | Information & communication | 2021 |
| Pointfield Limited | Manufacturing | 1997 |
| Poket Transport Ltd | Transport & logistics | 2025 |
| Polazet Ltd | Transport & logistics | 2025 |
| Polish Eagle Ltd | Transport & logistics | 2018 |
| Polkadot-Ele Limited | Arts & recreation | 2015 |
| Pollard Property Services Limited | Financial services | 2005 |
| Polygon Damage Control Limited | Administrative & support | 2001 |
| Polygon Digital Solutions Ltd | Information & communication | 2008 |
| Polygon Ireland Limited | Construction | 2023 |
| Pomulo Limited | Wholesale & retail | 2010 |
| Pooley Bridge Limited | Agriculture & fishing | 2013 |
| Pope Holdings & Development Co. Limited | Construction | 1981 |
| Poplar Farm Flowers Limited | Wholesale & retail | 2003 |
| Poplar Farm Flowers Two Limited | Agriculture & fishing | 2017 |
| Porcelgres Limited | Wholesale & retail | 2019 |
| Port Holme View Limited | Hospitality | 1998 |
| Portal Supplies & Design Limited | Manufacturing | 2003 |
| Portholme Management Company Limited | Households | 2022 |
| Portland Media Limited | Manufacturing | 2003 |
| Portland Properties Ltd | Real estate | 2016 |
| Posterity Film Ltd | Information & communication | 2026 |
| Posterity Holdings Ltd | Financial services | 2026 |
| Posterity Social Ltd | Information & communication | 2026 |
| Potters Bar Educational Assessments Ltd | Education | 2022 |
| Pound Road Properties Limited | Real estate | 2011 |
| Powerdiag AI Ltd | Information & communication | 2026 |
| Practical Data Ltd | Information & communication | 2019 |
| Practical Energy Solutions Ltd | Extraterritorial | 2023 |
| PRB Building Consultancy Limited | Professional & scientific | 2014 |
| PRB Fire Door Consultants Ltd | Construction | 2024 |
| Preloved Homes Ltd | Real estate | 2020 |
| Premier Properties (Cambs) Limited | Construction | 2005 |
| Premium Carp Fishing Limited | Wholesale & retail | 2006 |
| Presenta Connect Ltd | Wholesale & retail | 2004 |
| Presenta Connect Trading Ltd | Professional & scientific | 2004 |
| Presidential Concrete M&D Ltd | Construction | 2020 |
| Prestige Traditional Windows & Doors LLP | | 2023 |
| Prestine Services Ltd | Administrative & support | 2023 |
| Pretium Valcore Ltd | Professional & scientific | 2026 |
| Priinces Courier Ltd | Transport & logistics | 2021 |