| Performance Success Ltd | Extraterritorial | 2024 |
| Petale DE Nuit Limited | Wholesale & retail | 2026 |
| Peterscourt Consulting Limited | Professional & scientific | 2012 |
| PFP Solutions Ltd | Information & communication | 2011 |
| PGF Consultancy Limited | Professional & scientific | 2007 |
| Pgmd Holdings Limited | Real estate | 2022 |
| PGS Consultancy (UK) Limited | Administrative & support | 2009 |
| Pharma Marketing Consultants Ltd. | Information & communication | 2000 |
| Phase 40 Limited | Professional & scientific | 2010 |
| Philhellene Ltd | Hospitality | 2019 |
| Philip Barnett Consultants Limited | Information & communication | 2026 |
| Phillips and Anderson Limited | Professional & scientific | 1986 |
| Phoenix Open Systems Limited | Information & communication | 1996 |
| Phoenix Productions Worldwide Ltd | Administrative & support | 2021 |
| Photos by Bright Ltd | Information & communication | 2018 |
| Phpbb Limited | Extraterritorial | 2009 |
| Phrase Consulting Limited | Professional & scientific | 2023 |
| Phygital Collectibles Ltd | Manufacturing | 2026 |
| Pickart Platform Limited | Wholesale & retail | 2025 |
| Picture Frame TV Ltd | Wholesale & retail | 2011 |
| Pier House Management Company Limited | Real estate | 2022 |
| Pillar Consultants Limited | Professional & scientific | 2018 |
| Pine Trees (High Wycombe) Management Company Limited | Households | 2014 |
| Pinewood Property Limited | Real estate | 2004 |
| Pinfarthing Limited | Professional & scientific | 2014 |
| Pinpoint Data Science Limited | Professional & scientific | 2016 |
| Pixel Box Media Limited | Information & communication | 2009 |
| PJ Domains Limited | Information & communication | 2004 |
| PJM Decorators Limited | Construction | 2011 |
| PJP Imaging Ltd | Health & social care | 2025 |
| PJS Projects Ltd | Construction | 2017 |
| Plain Jane Holdings Ltd | Professional & scientific | 2019 |
| Plain Jane Investments Ltd | Financial services | 2019 |
| Plan J Ltd | Transport & logistics | 2026 |
| Platts Group Limited | Financial services | 2020 |
| Platts Investments Limited | Real estate | 2020 |
| Platts Motor Company Limited | Wholesale & retail | 1955 |
| Playcation Getaways Limited | Administrative & support | 2024 |
| Playhatch Developments Limited | Real estate | 1998 |
| PLG Engineering Limited | Professional & scientific | 2022 |
| PLM Enterprises Ltd. | Real estate | 1984 |
| Plus One Photos Limited | Professional & scientific | 2013 |
| Plus Onevents Limited | Professional & scientific | 2024 |
| Plus Pointing Ltd | Professional & scientific | 2020 |
| PMD Absolute Tax Advisory Ltd | Professional & scientific | 2024 |
| PMD: Absolute Coaching Limited | Professional & scientific | 2005 |
| PNC Consulting Services U.K Ltd | Other services | 2022 |
| Polkacrest Midlands Limited | Water & waste | 1993 |
| Pool Guys Limited | Administrative & support | 2014 |
| Porten Road Freehold Limited | Households | 2024 |
| Postboxx Productions Ltd | Information & communication | 2015 |
| Postilion Software Limited | Information & communication | 2025 |
| Poul Rohleder Ltd | Health & social care | 2021 |
| Powerrapid Limited | Real estate | 2002 |
| PP Advisory (UK) Limited | Real estate | 2021 |
| PP Capital Management (UK) Limited | Financial services | 2021 |
| PRB Consulting Ltd | Professional & scientific | 2025 |
| Premier Advice Limited | Extraterritorial | 2007 |
| Premier Financial Management Ltd | Professional & scientific | 1997 |
| Premiere Real Estate Developments Ltd. | Real estate | 2017 |
| Prestige Site Services Limited | Construction | 2016 |
| Pretorius Property Services Ltd | Real estate | 2026 |
| Pretzels UK Limited | Transport & logistics | 2006 |
| Prime Engineering Resource Limited | Professional & scientific | 2015 |
| Primrose LEA Freehold Limited | Households | 2002 |
| Primrose LEA Management Company Client (Marlow) Limited | Households | 1974 |
| Prinaya Ltd | Professional & scientific | 2019 |
| Priority Callout Services Ltd | Manufacturing | 2026 |
| Priory Road (Burnham) Residents Limited | Households | 1971 |
| Priory Road Management Ltd | Households | 2015 |
| Priscilla Holdings Limited | Real estate | 2025 |
| Pro CUT Wheels Limited | Wholesale & retail | 2025 |
| Pro Massage Limited | Health & social care | 2025 |
| Pro Prospect Limited | Administrative & support | 2025 |
| Process ICT Limited | Professional & scientific | 2012 |
| Prodicom Enterprise Limited | Information & communication | 2017 |
| Prohomebuild Ltd | Construction | 2024 |
| Property Q UK Ltd | Real estate | 2017 |
| Prospero Wealth & Property Ltd | Professional & scientific | 2013 |
| Przm Group LLP | | 2021 |
| PSK Rural Limited | Real estate | 2012 |
| Psyteck Labs Ltd | Information & communication | 2025 |
| Pump Lane Equine Veterinary Clinic Ltd | Professional & scientific | 2018 |
| Purchasing & Supply Consultancy Ltd | Professional & scientific | 2017 |
| Purely Nutrition Limited | Education | 2004 |
| Purple Heart Consulting Limited | Professional & scientific | 2022 |
| Purple OWL 1 LLP | | 2019 |
| Purple OWL Holdings Ltd | Professional & scientific | 2019 |
| Purpose House Ltd | Professional & scientific | 2018 |
| PWS Marlow Limited | Administrative & support | 2020 |
| Qserv Limited | Information & communication | 2010 |
| QT Design Limited | Information & communication | 2012 |
| Quabor Advisory Ltd | Professional & scientific | 2015 |
| Quality GCP Consultancy Jqagcp Ltd | Professional & scientific | 2017 |
| Quantara Global Limited | Information & communication | 2025 |
| Quantocks Consulting (QC) Limited | Professional & scientific | 2021 |
| Quantum Fourteen Ltd | Information & communication | 2021 |
| Quantum Linguistics Limited | Professional & scientific | 2015 |
| QUBE8 Ltd | Administrative & support | 2018 |
| Queen of Shebay Ltd | Wholesale & retail | 2013 |