| Paradigm Support Ltd. | Information & communication | 1998 |
| Paradise Capital Ltd | Financial services | 2025 |
| Parallax LLC Ltd | Households | 2026 |
| Parnextuk Services Ltd | Information & communication | 2026 |
| Parry's Management Services Limited | Construction | 1971 |
| Parsey Collectables Ltd | Wholesale & retail | 2025 |
| Parsonage Place Management Company Limited | Households | 2001 |
| Parsonwood Business Services Limited | Professional & scientific | 2010 |
| Passion IT Limited | Information & communication | 2017 |
| Patrick Stileman Limited | Professional & scientific | 2003 |
| Paul J O'Reilly Limited | Construction | 2006 |
| Payrock Solutions Ltd | Information & communication | 2024 |
| Paytech Consulting Limited | Information & communication | 2026 |
| PB Coach Club Ltd | Health & social care | 2022 |
| PBM Events Ltd | Administrative & support | 2022 |
| Peak Apprenticeships Ltd | Education | 2010 |
| Pelam Foods Limited | Wholesale & retail | 1989 |
| Penbryn Advisory Ltd | Administrative & support | 2024 |
| Penn Capital Limited | Professional & scientific | 2025 |
| Penn Street Projects Ltd | Professional & scientific | 2022 |
| Penn Street Works Management Limited | Real estate | 1995 |
| Pensioneer Trustees (Leeds) Limited | Financial services | 1987 |
| Pensioneer Trustees (London) Limited | Financial services | 1982 |
| Pensioneer Trustees Limited | Financial services | 1979 |
| Peoples Choice Transport Ltd | Transport & logistics | 2019 |
| Perception Broadcast Ltd | Information & communication | 2017 |
| Perception Tvcdn Ltd | Information & communication | 2018 |
| Peregrine Mead LLP | | 2025 |
| Peregrine Services Limited | Information & communication | 1986 |
| Perfect Landscapes Limited | Administrative & support | 2024 |
| Perfect Leading Limited | Manufacturing | 2022 |
| Perfectly Unique Occasions Ltd | Other services | 2026 |
| Performance Oils Limited | Wholesale & retail | 2004 |
| Perrins Consulting Ltd | Professional & scientific | 2017 |
| Pet Revolution Limited | Other services | 2010 |
| Pet Taxi Ltd | Transport & logistics | 2024 |
| PGV Ltd | Real estate | 2020 |
| Pharmint UK Limited | Wholesale & retail | 2025 |
| Pharos AC Ltd. | Professional & scientific | 2015 |
| Phase 5 Ventures Ltd | Professional & scientific | 2021 |
| Phast Clubs Limited | Administrative & support | 2019 |
| Phast Media Limited | Administrative & support | 2015 |
| PHD Cleaning Specialists Ltd | Administrative & support | 2026 |
| Phhd General Partner Limited | Professional & scientific | 2019 |
| Phhd LP | | 2019 |
| Phhd Property Limited | Real estate | 2019 |
| Phillips of London Limited | Professional & scientific | 1989 |
| Phlexglobal Limited | Professional & scientific | 1998 |
| Photoedge Ltd | Professional & scientific | 2022 |
| Pickwick Group Limited | Administrative & support | 2001 |
| Pickwick International Limited | Financial services | 2009 |
| PII Building Services Limited | Administrative & support | 2012 |
| Pindar Travel Information Systems Limited | Wholesale & retail | 2003 |
| Pineapple IT Ltd | Information & communication | 2015 |
| Pineapple Premises Ltd | Real estate | 2018 |
| Pinnacle Educational Homestay Limited | Other services | 2011 |
| Pinto Systems Ltd | Administrative & support | 2025 |
| Pivotal Protective Services Ltd | Administrative & support | 2016 |
| PIX Stop Limited | Information & communication | 2015 |
| Pixie Power Technology Ltd | Information & communication | 2021 |
| Pizza GPT Ltd | Hospitality | 2025 |
| Pj's Babysitting Services Ltd | Health & social care | 2020 |
| PJD Catering Consultancy Ltd | Hospitality | 2020 |
| Plan R Productions Ltd | Information & communication | 2010 |
| Planet 9 Enterprises Ltd | Real estate | 2015 |
| Platinum Retail Limited | Wholesale & retail | 2011 |
| PMJ Private Credit NO 1 Limited | Financial services | 2024 |
| Polopeopleplaces Ltd | Professional & scientific | 2018 |
| Polygon Holdings Limited | Financial services | 2020 |
| Ponyo Horsewear Ltd | Wholesale & retail | 2019 |
| Popabubble Uxbridge Limited | Wholesale & retail | 2021 |
| Popcraze Popcorn Ltd | Hospitality | 2025 |
| PORRINGER9 Ltd | Wholesale & retail | 2006 |
| Posh Lampie Production Services Limited | Professional & scientific | 2008 |
| Positivity Enterprises Ltd | Real estate | 2010 |
| Potbank Pictures Limited | Information & communication | 2020 |
| PP Enterprises Ltd | Administrative & support | 2024 |
| PPG International Limited | Financial services | 2022 |
| Ppil LLP | | 2026 |
| Practical Business Limited | Information & communication | 2001 |
| Praeco Services Limited | Professional & scientific | 2011 |
| Prathista BIO Tech Limited | Agriculture & fishing | 2022 |
| Prathista Life Sciences (PLS) Ltd | Wholesale & retail | 2020 |
| PRD Resources Limited | Information & communication | 2010 |
| Precedent Real Estate Advisers Ltd | Construction | 2019 |
| Precision SFX Ltd | Other services | 2012 |
| Preme & LUX Limited | Real estate | 2025 |
| Premier Care Support Ltd | Health & social care | 2022 |
| Premier GB Properties Limited | Real estate | 2018 |
| Pretty & Ellis (Auctions) Limited | Administrative & support | 2009 |
| Priestlands Dogs Ltd | Professional & scientific | 2022 |
| Prime Skincare Ltd | Wholesale & retail | 2018 |
| Primejet Cleaning Limited | Administrative & support | 2026 |
| Prithvi Investments Ltd | Real estate | 2021 |
| Private Office Consultancy Ltd | Professional & scientific | 2021 |
| Pro-Cat Engineering Ltd | Manufacturing | 2009 |
| Probability Limited | Professional & scientific | 2018 |
| Proctor House Newcastle LLP | | 2013 |
| Proctor Industries Limited | Extraterritorial | 1963 |
| Procuredem Ltd | Professional & scientific | 2024 |