| Pharma XP Consulting Ltd | Manufacturing | 2014 |
| Pharmathen U.K. Ltd | Professional & scientific | 2006 |
| Phillers Canteen Ltd | Hospitality | 2013 |
| Philon Ltd | Real estate | 2025 |
| PHL Property Development Ltd | Construction | 2026 |
| Phoenix (Bitterne Avenue Tilehurst) Management Limited | Households | 2006 |
| Phoenix Building Solutions Limited | Construction | 2020 |
| Phoenix Executive and Chauffeur Hire Ltd | Transport & logistics | 2013 |
| Physically Savvy Limited | Professional & scientific | 2024 |
| PHYSIO4YOU Specialist Rehabilitation Ltd | Health & social care | 2013 |
| Piccotts END Limited | Real estate | 2011 |
| Pickfords Wharf RTM Company Limited | Households | 2005 |
| Pickle Savvy Limited | Administrative & support | 2025 |
| Piedra Cocinar Ltd | Manufacturing | 2019 |
| Pilgrim Long and Sons Limited | Real estate | 1961 |
| Pineview Limited | Construction | 1999 |
| Pinky Promise CLO Ltd | Professional & scientific | 2025 |
| Pinky Promotions Ltd | Arts & recreation | 2024 |
| Pirt Design & Technology Limited | Manufacturing | 2013 |
| Pitterpat Bakery Ltd | Manufacturing | 2025 |
| Pixel ETC Limited | Professional & scientific | 2019 |
| Pixel Synapse Ltd | Professional & scientific | 2016 |
| Pixport Ltd | Information & communication | 2026 |
| PJ Inspection & Project Services Limited | Professional & scientific | 2020 |
| PJM UK Solutions Limited | Professional & scientific | 2020 |
| Pklw Invest Ltd | Real estate | 2020 |
| Place Shaping Solutions Limited | Professional & scientific | 2008 |
| Plan System Data Limited | Information & communication | 2019 |
| Planet Sustainable Event Signage Limited | Administrative & support | 2019 |
| Plant POT Publishing Limited | Information & communication | 2024 |
| Plant Property Portfolio Ltd | Real estate | 2021 |
| Plastisolutions Limited | Manufacturing | 2025 |
| Platinum Care (Devon) Ltd | Health & social care | 2015 |
| Platinum Care Limited | Health & social care | 1999 |
| Playfair Partnerships Group Ltd | Professional & scientific | 2021 |
| Playfair Partnerships Limited | Professional & scientific | 2003 |
| Playhouse East Limited | Arts & recreation | 2023 |
| Pleased AS Punch Ltd | Information & communication | 2025 |
| PM Recycling Solutions Ltd | Other services | 2023 |
| PM247 Ltd | Construction | 2014 |
| Pmc-Gas Limited | Construction | 2015 |
| PMR Design & Build Ltd | Construction | 2018 |
| PMS Developments Limited | Construction | 2015 |
| Pocket Enterprises Limited | Manufacturing | 2014 |
| Poelvoorde Associates Limited | Construction | 2020 |
| Poker Savvy Ltd | Professional & scientific | 2022 |
| Pollution Solution Holdings Limited | Administrative & support | 2019 |
| Ponder ZEN Ltd | Real estate | 2021 |
| Ponsbourne Manor Freehold Ltd | Real estate | 2022 |
| Port Hill Consulting Ltd | Administrative & support | 2019 |
| Port Hill Management Company Limited | Real estate | 2001 |
| Portland Construction Group Ltd | Construction | 2023 |
| Portland House (Gerrards Cross) Management Company Limited | Households | 2014 |
| Positive Strides Psychotherapy Ltd | Health & social care | 2024 |
| Potash Limited | Extraterritorial | 2008 |
| Potential Energy Renewables Ltd | Construction | 2024 |
| Power on Television Ltd | Information & communication | 2011 |
| Powerbeing Limited | Professional & scientific | 2016 |
| Powerhouse Industries Ltd | Manufacturing | 2020 |
| Pozzeco (UK) Ltd | Professional & scientific | 2020 |
| PR Plumbing GAS and Heating Ltd | Construction | 2014 |
| PR1 Consulting Limited | Other services | 2016 |
| Precision Guide Sales Limited | Professional & scientific | 2017 |
| Precision Safety Services Limited | Professional & scientific | 2011 |
| Preferred Acoustics and Design Limited | Construction | 2022 |
| Preferred Contracts Limited | Administrative & support | 1999 |
| Preferred Contracts UK Limited | Extraterritorial | 2008 |
| Premier Body Repairs Limited | Wholesale & retail | 2026 |
| Premier PL Products Limited | Wholesale & retail | 2024 |
| Premier Roofing (London) Ltd | Construction | 2014 |
| Premier Sports Solutions Limited | Wholesale & retail | 2005 |
| Premiere Electro-Mechanical Services Limited | Construction | 2005 |
| Premiere Security Services (London) Ltd | Administrative & support | 2016 |
| Premiere Street Lighting Limited | Construction | 2003 |
| Premium Alcohol Delivery Ltd. | Wholesale & retail | 2017 |
| Prep Chef Ltd | Hospitality | 2025 |
| Pressbay Limited | Wholesale & retail | 1983 |
| Prestige Vehicle Consultants Ltd | Wholesale & retail | 2014 |
| Prestige WW Limited | Real estate | 2017 |
| Pretty Gorgeous Cake Company Limited | Manufacturing | 2012 |
| Pretty Gorgeous Productions Ltd | Information & communication | 2018 |
| Prime Mechanical Services Ltd | Professional & scientific | 2020 |
| Prime Properties Group Ltd | Real estate | 2020 |
| Prime Protection UK Ltd | Construction | 2014 |
| Prince Alfred Mansions RTM Company Limited | Households | 2011 |
| Principl Advisory Ltd. | Professional & scientific | 2025 |
| Printing Pulse Limited | Manufacturing | 2025 |
| Priory Street (Ware) Management Limited | Households | 2003 |
| Prism Property Development & Investments Ltd | Real estate | 2020 |
| Prize Club Elite Limited | Information & communication | 2016 |
| Pro Ceramic Limited | Construction | 2022 |
| Pro Leak Ltd | Professional & scientific | 2025 |
| Pro Liquids and Plastics Ltd | Wholesale & retail | 2021 |
| Pro Recruit Ltd | Administrative & support | 2022 |
| Pro:Action Hertfordshire | Other services | 2008 |
| Professional Solutions Limited | Extraterritorial | 1996 |
| Profluent Services Ltd | Water & waste | 2018 |
| Progressive Outdoor Limited | Professional & scientific | 2022 |
| Project H Ltd | Professional & scientific | 2011 |
| Project H1 Ltd | Arts & recreation | 2020 |