| Paul Younge Engineering Limited | Manufacturing | 2008 |
| Paulian Management Co.Limited | Households | 1969 |
| Paulo Transport Ltd | Transport & logistics | 2025 |
| Pavilion Coffee House Limited | Hospitality | 2021 |
| Pawbot Ltd | Wholesale & retail | 2025 |
| Pbob Consulting Limited | Professional & scientific | 2022 |
| PBR Construction (Norfolk) Ltd | Construction | 2024 |
| PCL Ceramics EOT Limited | Administrative & support | 2022 |
| PCL Ceramics Holdings Limited | Financial services | 2017 |
| PCL Ceramics Limited | Manufacturing | 2003 |
| PCS Building Ltd | Construction | 2017 |
| PCS Garage Doors Ltd | Construction | 2018 |
| PCS Windows and Doors Ltd | Construction | 2018 |
| PD Carer Limited | Health & social care | 2023 |
| PDJ Management Limited | Professional & scientific | 2003 |
| Pdnuk Ltd | Other services | 2025 |
| PDR Plumbing & Heating Ltd | Construction | 2015 |
| PE Capital Limited | Financial services | 2020 |
| PE1 Graphics Ltd | Administrative & support | 2018 |
| Peace of Mind Electrical Ltd | Manufacturing | 2020 |
| Peak Access Ltd | Construction | 2025 |
| Pegasus Trading International Ltd | Other services | 2010 |
| Pelion Consulting Ltd | Information & communication | 2019 |
| Pellam Knight Limited | Real estate | 2023 |
| Peniston Carpet & Flooring Ltd. | Construction | 2008 |
| Peniston Limited | Construction | 2008 |
| Penny Hubbard Coaching and Consultancy Limited | Administrative & support | 2019 |
| Penny Wood Bespoke Ltd | Manufacturing | 2019 |
| Pentney House Gifts Limited | Wholesale & retail | 2007 |
| Pentney Properties Ltd | Real estate | 2018 |
| Penty Contractors Limited | Construction | 1988 |
| People Solutions Payroll Solutions Ltd | Administrative & support | 2023 |
| Pepperell Holdings Limited | Professional & scientific | 2014 |
| Perfect Party Tables Limited | Wholesale & retail | 2016 |
| Perfect Peaks Brews (UK) Limited | Wholesale & retail | 2025 |
| Perry Land Limited | Financial services | 2024 |
| Perry's Plastering Ltd | Construction | 2019 |
| Petals Tea Room Ltd | Wholesale & retail | 2020 |
| Peter Baker Motorcycles Limited | Wholesale & retail | 2008 |
| Peter Cook Events Limited Liability Partnership | | 2005 |
| Peter Earl Consulting Limited | Information & communication | 2007 |
| Peter Lankfer Limited | Agriculture & fishing | 2007 |
| Peter Sheppard Sports Agencies Limited | Arts & recreation | 2014 |
| Peter Treasure Statistical Services Limited | Professional & scientific | 2004 |
| Peterborough Grass Machinery Ltd. | Wholesale & retail | 1999 |
| Petoskey Ltd | Professional & scientific | 2025 |
| Pfcb Ltd | Real estate | 2025 |
| Pg&M Ltd | Administrative & support | 2021 |
| Pharm-Sys Ltd | Health & social care | 2020 |
| Pharmatek Limited | Professional & scientific | 2010 |
| Phebi Limited | Information & communication | 2017 |
| Philip Moorcroft Aggregates Consultancy Ltd | Professional & scientific | 2019 |
| Philip Parker Associates Ltd | Administrative & support | 2003 |
| Philipelliottconsultancy Ltd | Education | 2014 |
| Philippa Jane Aesthetics Ltd | Health & social care | 2025 |
| Phoenix Ford Limited | Construction | 2026 |
| Phun Limited | Wholesale & retail | 2012 |
| PHY & CR Management Company Limited | Households | 2016 |
| Picante Group Limited | Financial services | 2023 |
| Picapau Restaurant Limited | Hospitality | 2019 |
| Pickled Inns Limited | Hospitality | 2013 |
| Pierre Spake Limited | Wholesale & retail | 2012 |
| PIL Membranes EOT Limited | Administrative & support | 2020 |
| PIL Membranes Limited | Manufacturing | 2003 |
| Pilgrim Farming Limited | Agriculture & fishing | 2017 |
| Pink Group Holdings EOT Limited | Administrative & support | 2024 |
| Pinkfoot Properties Ltd | Construction | 2021 |
| Pinnacle Building Group Limited | Construction | 2025 |
| Pinnacle Consulting UK Limited | Administrative & support | 2002 |
| Pirates Brew Ltd | Hospitality | 2023 |
| Pishorn Developments Limited | Construction | 2006 |
| Pixel Chicken Limited | Information & communication | 2021 |
| PIXEL8 Games Ltd | Manufacturing | 2021 |
| Pizza Team UK Ltd | Manufacturing | 2026 |
| Pjla Properties Ltd | Real estate | 2024 |
| PJS Management Ltd | Construction | 2026 |
| Pk&H Ltd | Professional & scientific | 2019 |
| PKS Developments Limited | Real estate | 2017 |
| PKS EA Ltd | Construction | 2026 |
| Place Consultancy Ltd | Professional & scientific | 2025 |
| Plan Your Own Event Limited | Hospitality | 2025 |
| Planet Ocean Property Limited | Real estate | 2019 |
| Plantastic Food LLP | | 2025 |
| Plastecplus Limited | Administrative & support | 2007 |
| Platform One (Downham Market) Ltd | Hospitality | 2017 |
| Platinum House Clearance Services Ltd | Water & waste | 2022 |
| Platinum Key Developments Ltd | Real estate | 2025 |
| Platinum Tackle Ltd | Wholesale & retail | 2021 |
| Platonist Ltd | Professional & scientific | 2020 |
| Plooto Limited | Real estate | 2018 |
| Plumbchoice Heating & Property Maintenance Ltd | Construction | 2012 |
| Plumley Shellfish Limited | Agriculture & fishing | 2019 |
| Pluto World Ltd | Other services | 2012 |
| PM Bars Ltd | Hospitality | 2022 |
| PMY Innovations Ltd | Health & social care | 2019 |
| Pnwg Ltd | Financial services | 2025 |
| Pocknell Engineering Limited | Wholesale & retail | 2014 |
| Pointz of Interest Ltd | Health & social care | 2016 |
| Polar Skin and Oculoplastic Clinic Ltd | Health & social care | 2013 |
| Polly's Label Limited | Wholesale & retail | 2019 |