| Paul Downham Wealth Management Ltd | Professional & scientific | 2012 |
| Paul Thorby Limited | Professional & scientific | 2003 |
| PBW Roofing Limited | Construction | 2024 |
| PC Ltd | Extraterritorial | 2008 |
| Pdea Ltd | Professional & scientific | 2014 |
| PE Cares Ltd | Hospitality | 2022 |
| Pearson & Gourley Decorators Limited | Construction | 2009 |
| Peddars Way Properties Ltd | Real estate | 2021 |
| Pendragon Educational Publishers Limited | Information & communication | 2012 |
| Penn Green Packaging Co. Ltd | | 1983 |
| Percusssion Limited | Agriculture & fishing | 2018 |
| Performance Yoga Ltd | Arts & recreation | 2012 |
| Periwinkle Ltd | Real estate | 2022 |
| Pestell FVA Ltd | Professional & scientific | 2019 |
| Pestell Property Ltd | Real estate | 2023 |
| Petals & Blooms Ltd | Wholesale & retail | 2026 |
| Pete Matthews Home Improvements Limited | Construction | 2015 |
| Pharmagro Ltd | Professional & scientific | 2024 |
| Phoenix Vascular Limited | Information & communication | 2023 |
| Photos of England Ltd | Information & communication | 2023 |
| PHR Equine Limited | Agriculture & fishing | 2025 |
| PHU Giza Ltd | Wholesale & retail | 2018 |
| Physioptima Newmarket Limited | Health & social care | 2006 |
| Pika Creative Ltd | Professional & scientific | 2015 |
| Pikes HEY Holdings Ltd | Financial services | 2023 |
| Pink Unicorn Construction Limited | Construction | 2024 |
| Pinnacle Landmark Ltd | Real estate | 2025 |
| Pinpoint Advertising Limited | Information & communication | 1989 |
| Piotr Jasinski Ltd | Transport & logistics | 2017 |
| Pita Take Away Ltd | Hospitality | 2024 |
| Platinum Properties (ELY) Limited | Real estate | 2013 |
| Platinum Properties Cambridge Limited | Real estate | 2016 |
| Platinum Properties Newmarket Limited | Real estate | 2016 |
| Platinum Racing Limited | Extraterritorial | 1988 |
| Platinum Syndicate Limited | Extraterritorial | 1997 |
| Ploy Financial Services Limited | Professional & scientific | 2022 |
| Pluckrose Services Ltd | Other services | 2021 |
| Plutus Bloodstock Limited | Agriculture & fishing | 2014 |
| PM Actuarial Consulting Limited | Professional & scientific | 2025 |
| Pocock and Shaw Mildenhall Limited | Real estate | 2002 |
| Pocock and Shaw Newmarket Limited | Real estate | 2002 |
| Podge Investments Ltd | Financial services | 2023 |
| Poetry for Ltd | Wholesale & retail | 2024 |
| POINT2POINT Newmarket Ltd | Administrative & support | 2025 |
| Poiter Limited | Professional & scientific | 1997 |
| Polaris Air Conditioning Ltd | Construction | 2025 |
| Poletec Ltd | Professional & scientific | 2021 |
| Polson Motor Company Ltd | Wholesale & retail | 2017 |
| Porter London Limited | Wholesale & retail | 2025 |
| Portsonachan Leisure Limited | Other services | 2017 |
| Pour & Dunc Ltd | Hospitality | 2014 |
| Powters Limited | Manufacturing | 1997 |
| PP Property Limited | Hospitality | 2015 |
| PR Ltd | Extraterritorial | 2009 |
| Praecepta Aviation Ltd | Transport & logistics | 2025 |
| Precision Hospitality Ltd | Hospitality | 2026 |
| Premier School Limited | Arts & recreation | 2003 |
| Prep'D @ Sams Limited | Hospitality | 2019 |
| Prestige Agri Limited | Wholesale & retail | 2020 |
| Prestige Insulations Solutions Ltd | Construction | 2025 |
| Prestige Protection UK Ltd | Other services | 2018 |
| Prestige Vehicle Sales & Consultancy Ltd | Wholesale & retail | 2002 |
| Prestigious Hair Ltd | Other services | 2021 |
| Prime Crest Limited | Real estate | 1996 |
| Prime Kitchens (EA) Limited | Construction | 2024 |
| Prime Transport Services UK Limited | Transport & logistics | 2022 |
| Primeaxes Ltd | Administrative & support | 2026 |
| Primebuild Contruction Limited | Wholesale & retail | 2022 |
| Primedash Logistics Ltd | Transport & logistics | 2025 |
| Primo Developments Ltd | Construction | 2019 |
| Primrose Turner Limited | Agriculture & fishing | 2024 |
| Printie Mcprintface Ltd | Manufacturing | 2026 |
| Prior Packaging Limited | Wholesale & retail | 1969 |
| Prism Corporate Broking Limited | Professional & scientific | 2003 |
| Privu Ltd | Information & communication | 2025 |
| Pro Fleet Car&Commercials Ltd | Wholesale & retail | 2023 |
| Pro Pharm Care Ltd | Health & social care | 2016 |
| Profit Improvement Limited | Professional & scientific | 1982 |
| Prolet Properties Ltd | Real estate | 2019 |
| Prompt Developments Limited | Construction | 2019 |
| Prompt Plumbing Limited | Construction | 2011 |
| Prompt Residential Limited | Real estate | 2023 |
| Prospect Stud Limited | Agriculture & fishing | 2017 |
| Prospero Digital Ltd | Information & communication | 2017 |
| Prostruction Commercial Services Limited | Professional & scientific | 2009 |
| Protea PR and Marketing Ltd | Professional & scientific | 2025 |
| Protempeh Ltd | Manufacturing | 2020 |
| Provet Anaesthesia Ltd | Professional & scientific | 2026 |
| Providus Consulting Limited | Information & communication | 2008 |
| PS Apartments Ltd | Hospitality | 2019 |
| PU Limited | Extraterritorial | 2008 |
| Pugh Marketing Ltd | Professional & scientific | 2025 |
| Pukka Boy's Ltd | Real estate | 2024 |
| Pulston Limited | Professional & scientific | 2003 |
| Purple-Aurora Limited | Wholesale & retail | 2020 |
| Q Feeds Limited | Extraterritorial | 1972 |
| Qatar Bloodstock Limited | Wholesale & retail | 2010 |
| Qatar Racing Limited | Arts & recreation | 2012 |
| QC Ltd | Extraterritorial | 2009 |
| QH Limited | Extraterritorial | 2008 |