| Parkbuild Ltd | Construction | 2021 |
| Parkus Charles Ltd | Real estate | 2024 |
| Parmoor Wines Limited | Wholesale & retail | 2023 |
| Parras Investments Ltd | Financial services | 2012 |
| Paryrus Limited | Information & communication | 2012 |
| Passion Soul Plate Ltd | Hospitality | 2026 |
| PAT Steel School of Dance Limited | Other services | 2009 |
| Patache BIO Ltd | Professional & scientific | 2021 |
| Patten Partnership Limited | Professional & scientific | 2022 |
| Patternstone Paving & Resin Limited | Administrative & support | 2024 |
| Paudebbs Limited | Wholesale & retail | 2014 |
| Paul Upward Photography Limited | Professional & scientific | 2019 |
| PAV Khaira Implants Limited | Health & social care | 2021 |
| PB Design Services (Hants) Limited | Professional & scientific | 2011 |
| PB Sterling Advisory Limited | Financial services | 2026 |
| PB3 Fitness Limited | Arts & recreation | 2025 |
| PC17 Properties Ltd | Real estate | 2022 |
| PCB Ventures Ltd | Information & communication | 2024 |
| Pchp Ltd | Transport & logistics | 2025 |
| PDB Film Limited | Information & communication | 2024 |
| Pear Payment Ltd | Extraterritorial | 2014 |
| Peasant House Limited | Hospitality | 2023 |
| Peasant Restaurants Limited | Hospitality | 2021 |
| Pednor Limited | Real estate | 2013 |
| Pednor Property Limited | Real estate | 2017 |
| Peek-A-Bu Limited | Wholesale & retail | 2021 |
| Pembrey Asset Management Ltd | Real estate | 2007 |
| Pembury Consulting Limited | Professional & scientific | 2007 |
| Pemigo Limited | Hospitality | 2002 |
| PEN and Inc Ltd | Professional & scientific | 2004 |
| Penfoldswain Limited | Information & communication | 2015 |
| Pennyc Ltd | Real estate | 2024 |
| Peoplewise Solutions Ltd | Administrative & support | 2023 |
| Pepe's Plumbing Limited | Construction | 2015 |
| Peppermint Cleaning Limited | Administrative & support | 2016 |
| Performco Ltd | Information & communication | 2021 |
| Periculum Services Limited | Professional & scientific | 2024 |
| Perki Productions Ltd | Information & communication | 2005 |
| Personal Career Management Limited | Administrative & support | 2003 |
| Peter Brash Dental Care Limited | Health & social care | 2014 |
| Peter E Joseph Artist Ltd | Arts & recreation | 2025 |
| Peter Schwartz Consulting Limited | Professional & scientific | 2009 |
| Petra Consulting Ltd | Professional & scientific | 2019 |
| Petroleum India International Ltd | Administrative & support | 2012 |
| PGN Properties Limited | Real estate | 2019 |
| Pgtrthatcham Ltd | Wholesale & retail | 2022 |
| Pharmag Limited | Wholesale & retail | 2002 |
| PHD 5 Limited | Professional & scientific | 2017 |
| PHD Construction Group Limited | Professional & scientific | 2015 |
| PHD Security Limited | Administrative & support | 2014 |
| Pheonix Surfacing Solutions Limited | Construction | 2023 |
| PHI Trading & Consultancy Limited | Administrative & support | 2015 |
| Phil Perry Limited | Construction | 2009 |
| PHL Enterprises Ltd | Professional & scientific | 2007 |
| Phoenix Running Hertfordshire Ltd | Arts & recreation | 2025 |
| Phoselite Consulting Limited | Professional & scientific | 2012 |
| PI Squared Limited | Information & communication | 1989 |
| Pickford Props Ltd | Information & communication | 2022 |
| Picsync Limited | Information & communication | 2009 |
| PIG Construction Limited | Manufacturing | 2015 |
| Pilling Care Ltd | Health & social care | 2016 |
| PIM Developments Ltd | Construction | 2006 |
| Pinnacle Finance & Systems Limited | Administrative & support | 2013 |
| Pinnacle One Ltd | Professional & scientific | 2025 |
| Pinnash Properties Limited | Real estate | 2013 |
| PIP (Clapton) Limited | Wholesale & retail | 2023 |
| Pitrotech Ltd | Information & communication | 2018 |
| Pizza Rebellion Ltd | Hospitality | 2020 |
| PJV Property Ltd | Real estate | 2023 |
| Pkjp Property Management Ltd | Real estate | 2017 |
| Planit Project Management Limited | Administrative & support | 2006 |
| Platform T L Limited | Information & communication | 2022 |
| Platformation Enterprise Services Limited | Professional & scientific | 2017 |
| Platned Ltd | Information & communication | 2011 |
| Plato & Pablo Limited | Professional & scientific | 2016 |
| Playcation Padel Limited | Administrative & support | 2025 |
| Playroom Creative Services Limited | Information & communication | 2007 |
| Plough Lane Developments Limited | Construction | 2019 |
| Plumbco UK Limited | Wholesale & retail | 2003 |
| PM Lipton Ltd | Arts & recreation | 2022 |
| Pmay Associates Ltd | Professional & scientific | 2016 |
| Pnfp Consulting Ltd | Information & communication | 2025 |
| PNG Design Limited | Information & communication | 2023 |
| Polaris Construction Consultants Limited | Professional & scientific | 2018 |
| Policing People Limited | Administrative & support | 2019 |
| POP and MOO Limited | Wholesale & retail | 2018 |
| Porchway Estates Ltd | Real estate | 2015 |
| Port Royal Media Ltd | Information & communication | 2016 |
| Portfolio Business Finance Ltd | Financial services | 2023 |
| Portlands Management Company Limited | Households | 1989 |
| Porto Bray Holdings Limited | Extraterritorial | 2025 |
| Porto Bray UK Commercial Limited | Real estate | 2025 |
| Portstar Consulting Ltd | Construction | 2004 |
| Potd Ltd | Professional & scientific | 2024 |
| Potentia-Sports Limited | Professional & scientific | 2025 |
| Powerland Estates Limited | Financial services | 2026 |
| Powershift Media Limited | Information & communication | 2000 |
| Powertec Electrical Installation Limited | Construction | 2001 |
| Powertrib Limited | Professional & scientific | 2008 |
| PPM Nexus Ltd | Professional & scientific | 2023 |